阅读说明：本技术 一种高效制冷方法及其系统 (High-efficiency refrigeration method and system thereof ) 是由 袁一军 黄宗华 于 2021-08-13 设计创作，主要内容包括：本发明公开了一种高效制冷方法及其系统,本发明通过建立包含压缩过程、冷凝过程、具有大温差过冷的过冷过程、膨胀过程和蒸发过程的冷媒压缩制冷循环,利用冷媒压缩制冷循环中的蒸发过程进行制冷。其中,所述的大温差过冷为冷媒降温幅度大于10℃,实现方法如下：采用其它的人工制冷循环对冷凝过程结束的高压冷媒进行大温差过冷。和/或采用一个或多个蓄冷容器的冷水或载冷剂的蓄冷对冷凝过程结束的高压冷媒进行大温差过冷。冷水或载冷剂的蓄冷通过所述冷媒压缩制冷循环的蒸发过程进行蓄冷或通过其它的人工制冷循环的蒸发过程进行蓄冷,或利用环境气候变化进行蓄冷。本发明充分利用了蒸发温度不同,制冷COP不同实现节能,并利用蓄冷实现进一步节能。(The invention discloses a high-efficiency refrigeration method and a system thereof, and the invention carries out refrigeration by utilizing the evaporation process in a refrigerant compression refrigeration cycle by establishing the refrigerant compression refrigeration cycle comprising a compression process, a condensation process, a supercooling process with large temperature difference, an expansion process and an evaporation process. The large-temperature-difference supercooling method is implemented by the following steps that the temperature reduction amplitude of a refrigerant is larger than 10 ℃ and the large-temperature-difference supercooling method comprises the following steps: and performing large-temperature difference supercooling on the high-pressure refrigerant after the condensation process by adopting other artificial refrigeration cycles. And/or cold water or secondary refrigerant of one or more cold accumulation containers is adopted for cold accumulation to carry out large-temperature-difference supercooling on the high-pressure refrigerant after the condensation process is finished. The cold accumulation of the cold water or the secondary refrigerant is carried out by the evaporation process of the refrigerant compression refrigeration cycle or other artificial refrigeration cycle, or the cold accumulation is carried out by utilizing the environmental climate change. The invention fully utilizes the difference of evaporation temperature and refrigeration COP to realize energy saving, and utilizes cold accumulation to realize further energy saving.)

1. The efficient refrigerating method is characterized in that the method utilizes the evaporation process in a refrigerant compression refrigerating cycle to refrigerate by establishing the refrigerant compression refrigerating cycle comprising a compression process, a condensation process, a supercooling process with large temperature difference, an expansion process and an evaporation process. The large-temperature-difference supercooling method is implemented by the following steps that the temperature reduction amplitude of a refrigerant is larger than 10 ℃ and the large-temperature-difference supercooling method comprises the following steps:

and performing large-temperature difference supercooling on the high-pressure refrigerant after the condensation process by adopting other artificial refrigeration cycles.

And/or cold water or secondary refrigerant of one or more cold accumulation containers is adopted for cold accumulation to carry out large-temperature-difference supercooling on the high-pressure refrigerant after the condensation process is finished. The cold accumulation of the cold water or the secondary refrigerant is carried out by the evaporation process of the refrigerant compression refrigeration cycle or other artificial refrigeration cycle, or the cold accumulation is carried out by utilizing the environmental climate change.

2. The method as claimed in claim 1, wherein the artificial refrigeration cycle comprises more than two refrigeration cycles, each refrigeration cycle has a different evaporation temperature, and at least one refrigeration cycle has an evaporation temperature higher than that of the refrigerant compression refrigeration cycle.

3. The method as claimed in claim 1, wherein the cold accumulation containers are two, namely a first cold accumulation container and a second cold accumulation container, and cold water or secondary refrigerant in the two cold accumulation containers is alternately subjected to cold accumulation and large-temperature-difference supercooling on a high-pressure refrigerant at the end of the condensation process, namely: when the first cold accumulation container utilizes other artificial refrigeration cycles to cool and accumulate cold for cold water or secondary refrigerant, the cold water or the secondary refrigerant of the second cold accumulation container carries out large-temperature-difference supercooling on the high-pressure refrigerant after the condensation process is finished, when the cold water or the secondary refrigerant in the second cold accumulation container has large-temperature-difference temperature rise, the cold water or the secondary refrigerant is switched to be cooled and accumulated by utilizing other artificial refrigeration cycles, and at the moment, the first cold accumulation container is switched to utilize the cold water or the secondary refrigerant to carry out large-temperature-difference supercooling on the high-pressure refrigerant after the condensation process is finished.

4. A high-efficiency refrigerating system is characterized by comprising a main compressor, a main condenser, a supercooling device, a main throttle valve, a main evaporator and one or more groups of auxiliary units, wherein each group of auxiliary units comprises an auxiliary condenser, an auxiliary compressor and an auxiliary throttle valve; the main compressor, the main condenser, the supercooling device, the main throttle valve and the main evaporator are sequentially connected into a loop through a main refrigerant pipeline, a refrigerant is driven by the main compressor to circulate in the main refrigerant pipeline, and the refrigerant is condensed by the main condenser, supercooled and cooled by the supercooling device, expanded by the main throttle valve and evaporated by the main evaporator and then returns to the main compressor; and the cold energy generated by the evaporation of the refrigerant in the main evaporator is used for high-efficiency refrigeration. The supercooling device is used for large-temperature-difference supercooling with the cooling amplitude of the refrigerant larger than 10 ℃ and comprises one or more series-connected subcoolers. The number of the subcoolers is more than or equal to that of the auxiliary units, the other fluid channel of part of the subcoolers and the auxiliary compressor, the auxiliary condenser and the auxiliary throttle valve of the corresponding auxiliary unit are sequentially connected into a loop through an auxiliary refrigerant pipeline, and the refrigerant is driven by the auxiliary compressor to circulate in the auxiliary refrigerant pipeline and returns to the auxiliary compressor after passing through the auxiliary condenser, the auxiliary throttle valve and the subcooler.

5. The efficient refrigerating system is characterized by comprising a main refrigerant compression refrigerating cycle unit and an auxiliary refrigerant compression refrigerating cycle unit, wherein the main refrigerant compression refrigerating cycle unit comprises a main compressor, a main condenser, a supercooling device, a main throttle valve and a main evaporator which are sequentially connected into a loop through a main refrigerant pipeline. The refrigerant is driven by the main compressor to circulate in the main refrigerant pipeline, and is condensed by the main condenser, subcooled and cooled by the supercooling device, expanded by the main throttle valve and evaporated by the main evaporator and then returns to the main compressor; and the cold energy generated by the evaporation of the refrigerant in the main evaporator is used for high-efficiency refrigeration. The supercooling device is used for large-temperature-difference supercooling with the cooling amplitude of the refrigerant larger than 10 ℃ and comprises one or more series-connected subcoolers. The auxiliary refrigerant compression refrigeration cycle unit comprises an auxiliary compressor, an auxiliary condenser, an auxiliary throttle valve and one or more auxiliary evaporators which are connected in series, wherein the auxiliary compressor, the auxiliary condenser and the auxiliary throttle valve are sequentially connected into a loop by an auxiliary refrigerant pipeline; the refrigerant is driven by the auxiliary compressor to circulate in the auxiliary refrigerant pipeline, and returns to the auxiliary compressor after passing through the auxiliary condenser, the auxiliary throttle valve and the auxiliary evaporator. And the other fluid channel of the one or more auxiliary evaporators connected in series is communicated with the other fluid channel of the one or more subcoolers connected in series, and the refrigerating capacity of the auxiliary evaporators is subcooled through a subcooling device by means of coolant circulation.

6. The efficient refrigerating system is characterized by comprising a main refrigerant compression refrigerating cycle unit, an auxiliary refrigerant compression refrigerating cycle unit and a cold accumulation container for storing secondary refrigerants, wherein the main refrigerant compression refrigerating cycle unit comprises a main compressor, a main condenser, a supercooling device, a main throttle valve and a main evaporator which are sequentially connected into a loop through a main refrigerant pipeline. The refrigerant is driven by the main compressor to circulate in the main refrigerant pipeline, and is condensed by the main condenser, subcooled and cooled by the supercooling device, expanded by the main throttle valve and evaporated by the main evaporator and then returns to the main compressor; and the cold energy generated by the evaporation of the refrigerant in the main evaporator is used for high-efficiency refrigeration. The supercooling device is used for large-temperature-difference supercooling with the cooling amplitude of the refrigerant larger than 10 ℃ and comprises one or more series-connected subcoolers. The auxiliary refrigerant compression refrigeration cycle unit comprises an auxiliary compressor, an auxiliary condenser, an auxiliary throttle valve and one or more auxiliary evaporators which are connected in series, wherein the auxiliary compressor, the auxiliary condenser and the auxiliary throttle valve are sequentially connected into a loop by an auxiliary refrigerant pipeline; the refrigerant is driven by the auxiliary compressor to circulate in the auxiliary refrigerant pipeline, and returns to the auxiliary compressor after passing through the auxiliary condenser, the auxiliary throttle valve and the auxiliary evaporator. The cold accumulation container is characterized in that a first inlet, a first outlet, a second inlet and a second outlet are respectively arranged on two sides of the cold accumulation container, wherein the first outlet and the first inlet are connected with an inlet and an outlet of another fluid channel of one or more series-connected subcoolers to form a first loop, the second outlet and the second inlet are respectively connected with an inlet and an outlet of another fluid channel of one or more series-connected auxiliary evaporators to form a second loop, when the first loop circulates, the secondary refrigerant is used for subcooling the refrigerant of the main refrigerant compression refrigeration cycle unit through the subcooling device, and when the second loop circulates, the auxiliary refrigerant compression refrigeration cycle unit is used for refrigerating the secondary refrigerant.

7. The system of claim 6, wherein there are two cold storage containers for storing the secondary refrigerant, and each of the two cold storage containers has a first inlet, a first outlet, a second inlet, and a second outlet on two sides, wherein the first outlet and the first inlet are connected to the inlet and the outlet of another fluid channel of the one or more subcoolers connected in series to form a first loop, and the second outlet and the second inlet are connected to the inlet and the outlet of another fluid channel of the one or more auxiliary evaporators connected in series to form a second loop, wherein when the first loop is circulated, the secondary refrigerant subcools the refrigerant of the main refrigerant compression refrigeration cycle unit through the subcooling device, and when the second loop is circulated, the auxiliary refrigerant compression refrigeration cycle unit refrigerates the secondary refrigerant. The two cold accumulation containers only perform one loop circulation and the loop circulations of the two cold accumulation containers are different.

8. The system as claimed in any one of claims 6 to 7, wherein the main compressor and the auxiliary compressor are centrifugal compressors, the other fluid channel of the main condenser and the auxiliary condenser is filled with cooling water for cooling, the other fluid channel of the evaporator is filled with water for producing chilled water, including medium-temperature water or low-temperature water, and the cold storage container is a fire-fighting water pool.

9. The system as claimed in any one of claims 6 to 7, wherein the second loop cycle is activated for cold storage during periods of low electricity prices and the first loop cycle is activated for subcooling the refrigerant of the main refrigerant compression refrigeration cycle unit during periods of high electricity prices.

10. The system as claimed in any one of claims 6 to 7, wherein the system comprises a plurality of main refrigerant compression refrigeration cycle units, the inlet and outlet of the other fluid channel of the supercooling device of each main refrigerant compression refrigeration cycle unit are connected with the cold accumulation container, and the auxiliary refrigerant compression refrigeration cycle unit is shared for refrigerating the secondary refrigerant.

Technical Field

The invention relates to a refrigeration cycle and a system for supercooling by utilizing large temperature difference, in particular to a refrigeration cycle and a system for realizing large temperature difference supercooling by utilizing artificial refrigeration.

Background

The conventional refrigerant compression refrigeration cycle comprises four processes of liquid refrigerant evaporation refrigeration, gaseous refrigerant compression, gaseous refrigerant condensation and liquid refrigerant throttling decompression. The refrigerant compression system includes a compressor, a throttle valve, an evaporator and a condenser. In fact, the sensible heat of the high-pressure refrigerant passing through the condenser is not released, which inevitably results in a decrease in the cooling capacity of the refrigerant compression cycle and a decrease in the cooling efficiency. Therefore, in the ideal refrigerant compression cycle, a subcooler is additionally arranged behind the condenser to subcool the high-pressure refrigerant, so that the performance of the refrigeration cycle is improved.

At present, most of refrigeration systems are not supercooled, and the main reason is that firstly, a proper cold source is not available to provide cold energy required by supercooling for a subcooler, and secondly, the supercooling degree has different influences on the refrigerating capacity and the refrigerating coefficient according to different refrigerants, and in average, the refrigerating capacity is increased or the COP is increased by about 1% when the temperature is reduced once, so if supercooling with large temperature difference is not realized, the supercooling effect is not obvious, and therefore, a method and a means for efficiently and economically providing large supercooling temperature difference are needed.

Disclosure of Invention

The invention provides a new high-efficiency refrigeration method and system aiming at the problems.

The technical scheme is as follows:

a high-efficiency refrigeration method is characterized in that a refrigerant compression refrigeration cycle comprising a compression process, a condensation process, a supercooling process with large temperature difference supercooling, an expansion process and an evaporation process is established, and the evaporation process in the refrigerant compression refrigeration cycle is utilized for refrigeration. The large-temperature-difference supercooling method is implemented by the following steps that the temperature reduction amplitude of a refrigerant is larger than 10 ℃ and the large-temperature-difference supercooling method comprises the following steps:

and performing large-temperature difference supercooling on the high-pressure refrigerant after the condensation process by adopting other artificial refrigeration cycles.

And/or cold water or secondary refrigerant of one or more cold accumulation containers is adopted for cold accumulation to carry out large-temperature-difference supercooling on the high-pressure refrigerant after the condensation process is finished. The cold accumulation of the cold water or the secondary refrigerant is carried out by the evaporation process of the refrigerant compression refrigeration cycle or other artificial refrigeration cycle, or the cold accumulation is carried out by utilizing the environmental climate change.

The invention utilizes the artificial refrigeration cycle with high evaporation temperature to carry out supercooling on the refrigerant compression refrigeration cycle with low evaporation temperature, fully utilizes the difference of evaporation temperature and the difference of refrigeration COP (coefficient of performance) to realize energy conservation, and the Table 1 shows the COP corresponding to the different evaporation temperatures of the refrigeration of the centrifugal compression water chiller, and can effectively reduce the COP when the cooling amplitude of the refrigerant is more than 10 ℃. Meanwhile, the cold is stored at different time periods according to the electricity price, so that the energy is further saved.

TABLE 1 corresponding COP at different evaporation temperatures

Further, the artificial refrigeration cycle includes more than two refrigeration cycles, such as refrigeration cycles including a compression process, a condensation process, an expansion process, and an evaporation process, the evaporation temperature of each refrigeration cycle is different, and the evaporation temperature of at least one refrigeration cycle is higher than the evaporation temperature of the refrigerant compression refrigeration cycle.

Further, the number of the cold accumulation containers is two, and the cold accumulation containers are respectively a first cold accumulation container and a second cold accumulation container, cold water or secondary refrigerant in the two cold accumulation containers alternately performs cold accumulation and large temperature difference supercooling on a high-pressure refrigerant after the condensation process is finished, namely: when the first cold accumulation container utilizes other artificial refrigeration cycles to cool and accumulate cold for cold water or secondary refrigerant, the cold water or the secondary refrigerant of the second cold accumulation container carries out large-temperature-difference supercooling on the high-pressure refrigerant after the condensation process is finished, when the cold water or the secondary refrigerant in the second cold accumulation container has large-temperature-difference temperature rise, the cold water or the secondary refrigerant is switched to be cooled and accumulated by utilizing other artificial refrigeration cycles, and at the moment, the first cold accumulation container is switched to utilize the cold water or the secondary refrigerant to carry out large-temperature-difference supercooling on the high-pressure refrigerant after the condensation process is finished. Wherein the two cold accumulation containers can be two independent cold accumulation containers or two independent cold accumulation areas obtained by dividing one cold accumulation container.

A high-efficiency refrigeration system comprises a main compressor, a main condenser, a supercooling device, a main throttle valve, a main evaporator and one or more groups of auxiliary units, wherein each group of auxiliary units comprises an auxiliary condenser, an auxiliary compressor and an auxiliary throttle valve; the main compressor, the main condenser, the supercooling device, the main throttle valve and the main evaporator are sequentially connected into a loop through a main refrigerant pipeline, a refrigerant is driven by the main compressor to circulate in the main refrigerant pipeline, and the refrigerant is condensed by the main condenser, supercooled and cooled by the supercooling device, expanded by the main throttle valve and evaporated by the main evaporator and then returns to the main compressor; and the cold energy generated by the evaporation of the refrigerant in the main evaporator is used for high-efficiency refrigeration. The supercooling device is used for large-temperature-difference supercooling with the cooling amplitude of the refrigerant larger than 10 ℃ and comprises one or more series-connected subcoolers with the same number as the auxiliary units. The other fluid channel of each subcooler is sequentially connected with an auxiliary compressor, an auxiliary condenser and an auxiliary throttle valve of the corresponding auxiliary unit by an auxiliary refrigerant pipeline to form a loop, and the refrigerant is driven by the auxiliary compressor to circulate in the auxiliary refrigerant pipeline and then returns to the auxiliary compressor after passing through the auxiliary condenser, the auxiliary throttle valve and the subcooler.

Furthermore, the evaporation temperatures of the refrigeration cycles formed by different auxiliary units and the subcoolers are different, and the evaporation temperature of at least one refrigeration cycle is higher than the evaporation temperature of the refrigerant compression refrigeration cycle.

The main refrigerant compression refrigeration cycle unit comprises a main compressor, a main condenser, a supercooling device, a main throttle valve and a main evaporator which are sequentially connected into a loop by a main refrigerant pipeline. The refrigerant is driven by the main compressor to circulate in the main refrigerant pipeline, and is condensed by the main condenser, subcooled and cooled by the supercooling device, expanded by the main throttle valve and evaporated by the main evaporator and then returns to the main compressor; and the cold energy generated by the evaporation of the refrigerant in the main evaporator is used for high-efficiency refrigeration. The supercooling device is used for large-temperature-difference supercooling with the cooling amplitude of the refrigerant larger than 10 ℃ and comprises one or more series-connected subcoolers. The auxiliary refrigerant compression refrigeration cycle unit comprises an auxiliary compressor, an auxiliary condenser, an auxiliary throttle valve and one or more auxiliary evaporators which are connected in series, wherein the auxiliary compressor, the auxiliary condenser and the auxiliary throttle valve are sequentially connected into a loop by an auxiliary refrigerant pipeline; the refrigerant is driven by the auxiliary compressor to circulate in the auxiliary refrigerant pipeline, and returns to the auxiliary compressor after passing through the auxiliary condenser, the auxiliary throttle valve and the auxiliary evaporator. And the other fluid channel of the one or more auxiliary evaporators connected in series is communicated with the other fluid channel of the one or more subcoolers connected in series, and the refrigerating capacity of the auxiliary evaporators is subcooled through a subcooling device by means of coolant circulation.

Furthermore, the auxiliary refrigerant compression refrigeration cycle units have different evaporation temperatures, and the evaporation temperature of at least one refrigeration cycle is higher than that of the main refrigerant compression refrigeration cycle unit.

A high-efficiency refrigerating system comprises a main refrigerant compression and refrigeration cycle unit, an auxiliary refrigerant compression and refrigeration cycle unit and a cold accumulation container for storing secondary refrigerants, wherein the main refrigerant compression and refrigeration cycle unit comprises a main compressor, a main condenser, a supercooling device, a main throttle valve and a main evaporator which are sequentially connected into a loop through a main refrigerant pipeline. The refrigerant is driven by the main compressor to circulate in the main refrigerant pipeline, and is condensed by the main condenser, subcooled and cooled by the supercooling device, expanded by the main throttle valve and evaporated by the main evaporator and then returns to the main compressor; and the cold energy generated by the evaporation of the refrigerant in the main evaporator is used for high-efficiency refrigeration. The supercooling device is used for large-temperature-difference supercooling with the cooling amplitude of the refrigerant larger than 10 ℃ and comprises one or more series-connected subcoolers. The auxiliary refrigerant compression refrigeration cycle unit comprises an auxiliary compressor, an auxiliary condenser, an auxiliary throttle valve and one or more auxiliary evaporators which are connected in series, wherein the auxiliary compressor, the auxiliary condenser and the auxiliary throttle valve are sequentially connected into a loop by an auxiliary refrigerant pipeline; the refrigerant is driven by the auxiliary compressor to circulate in the auxiliary refrigerant pipeline, and returns to the auxiliary compressor after passing through the auxiliary condenser, the auxiliary throttle valve and the auxiliary evaporator. The cold accumulation container is characterized in that a first inlet, a first outlet, a second inlet and a second outlet are respectively arranged on two sides of the cold accumulation container, wherein the first outlet and the first inlet are connected with an inlet and an outlet of another fluid channel of one or more series-connected subcoolers to form a first loop, the second outlet and the second inlet are respectively connected with an inlet and an outlet of another fluid channel of one or more series-connected auxiliary evaporators to form a second loop, when the first loop circulates, the secondary refrigerant is used for subcooling the refrigerant of the main refrigerant compression refrigeration cycle unit through the subcooling device, and when the second loop circulates, the auxiliary refrigerant compression refrigeration cycle unit is used for refrigerating the secondary refrigerant.

Furthermore, the two cold storage containers for storing the secondary refrigerant are provided, two sides of each cold storage container are respectively provided with a first inlet, a first outlet, a second inlet and a second outlet, wherein the first outlet and the first inlet are respectively connected with the inlet and the outlet of the other fluid channel of the one or more series-connected subcoolers to form a first loop, the second outlet and the second inlet are respectively connected with the inlet and the outlet of the other fluid channel of the one or more series-connected auxiliary evaporators to form a second loop, when the first loop circulates, the secondary refrigerant is used for supercooling the refrigerant of the main refrigerant compression refrigeration cycle unit through the supercooling device, and when the second loop circulates, the auxiliary refrigerant compression refrigeration cycle unit is used for refrigerating the secondary refrigerant. The two cold accumulation containers only carry out one loop circulation and the loop circulations of the two cold accumulation containers are different, so that the two cold accumulation containers alternately carry out supercooling and refrigeration.

Further, the main compressor and the auxiliary compressor adopt centrifugal compressors, the other fluid channel of the main condenser and the auxiliary condenser is filled with cooling water for cooling, the other fluid channel of the evaporator is filled with water for preparing chilled water, the chilled water comprises medium-temperature water or low-temperature water, and the cold accumulation container is a fire pool.

And further, the second loop circulation is started for cold storage in a low electricity price period, and the first loop circulation is started for supercooling the refrigerant of the main refrigerant compression refrigeration circulation unit in a high electricity price period.

Furthermore, the refrigerant compression main system is provided with a plurality of refrigerant compression auxiliary systems or containers at the same time.

The invention has the beneficial effects that: the invention not only depends on the natural cold source to provide the cold energy for supercooling, but also adopts artificial refrigeration to ensure the supercooling cold source, secondly, the invention fully utilizes different evaporation temperatures and different refrigeration COP, utilizes the artificial refrigeration with high evaporation temperature to provide supercooling for the low evaporation temperature refrigerant compression circulation, simultaneously utilizes the artificial refrigeration circulation with a plurality of evaporation temperatures to provide supercooling, realizes large temperature difference supercooling, and fully utilizes energy storage, especially the large temperature difference energy storage to provide supercooling, and realizes efficient and economic supercooling.

The invention has the advantages of environmental protection, energy saving, economy, high efficiency, simplicity, applicability and the like, and can be widely used for various refrigeration systems.

Drawings

FIG. 1 is a first diagram of a system for providing subcooling using a direct expansion refrigerant compression refrigeration cycle;

FIG. 2 is a second schematic diagram of a system for providing subcooling using a direct expansion refrigerant compression refrigeration cycle;

FIG. 3 is a first block diagram of a system utilizing a refrigerant compression refrigeration cycle and providing subcooling via a coolant;

FIG. 4 is a second block diagram of a system utilizing a refrigerant compression refrigeration cycle and providing subcooling via a coolant;

fig. 5 is a first block diagram of a system for providing subcooling using a regenerator;

figure 6 is a second system configuration diagram utilizing a regenerator to provide subcooling;

FIG. 7 is a first block diagram of a system for providing subcooling using two regenerators;

fig. 8 is a second system configuration diagram utilizing two regenerators to provide subcooling;

FIG. 9 is a first block diagram of a system for an electronic factory;

FIG. 10 is a second system configuration diagram applied to an electronic factory.

Detailed Description

As shown in fig. 1, the system 100 includes a main refrigerant compression refrigeration cycle unit and an auxiliary unit providing subcooling for the main refrigerant compression refrigeration cycle unit. The main refrigerant compression refrigeration cycle unit includes a main compressor 101, a main condenser 102, a first subcooler 1031 and a second subcooler 1041, a main throttle valve 105, a main evaporator 106, a main refrigerant pipe 107, and the like. The main refrigerant compression refrigeration cycle unit connects all parts through refrigerant pipelines according to a known refrigerant refrigeration system connection mode to form a refrigerant cycle system, namely: the system comprises a main compressor 101, a main condenser 102, a first subcooler 1031, a second subcooler 1041, a main throttle valve 105 and a main evaporator 106, wherein the main compressor 106 is sequentially connected into a loop through a main refrigerant pipeline 107, refrigerant is driven by the main compressor 101 to circulate in the main refrigerant pipeline 107, and the refrigerant is condensed by the main condenser 102, subcooled and cooled by the first subcooler 1031 and the second subcooler 1041, expanded by the main throttle valve 105, evaporated by the main evaporator 106 and then returned to the main compressor 101; and the cold energy generated by the evaporation of the refrigerant in the main evaporator is used for high-efficiency refrigeration. The first and second subcoolers 1031 and 1041 are located downstream of the main condenser 102 and upstream of the main throttle 105, and perform large temperature difference subcooling on the high-pressure refrigerant after the condensation process is completed. The sub-units are first sub-coolers and second sub-coolers for sub-cooling, and sub-coolers 1031 and 1041 shown in fig. 1 are respectively provided with a first sub-unit and a second sub-unit, wherein the sub-coolers also serve as evaporators and the sub-units to form a refrigerant compression refrigeration cycle, the refrigerant in the first sub-unit has a higher evaporation temperature and is higher than the evaporation temperature of the main refrigerant compression refrigeration cycle unit, and the refrigerant in the second sub-unit has a lower evaporation temperature. Specifically, the first auxiliary unit includes a first auxiliary compressor 1034, a first auxiliary condenser 1033, a first auxiliary throttle valve 1032 and a first auxiliary refrigerant pipe 1035, and the other fluid passages of the first auxiliary compressor 1034, the first auxiliary condenser 1033, the first auxiliary throttle valve 1032 and the first subcooler 1031 are connected in sequence through the first auxiliary refrigerant pipe 1035 to form a compression refrigeration cycle. Similarly, the second auxiliary system further includes a second auxiliary condenser 1043, a second auxiliary compressor 1044, a second auxiliary throttle valve 1042 and a second auxiliary refrigerant pipe 1045, the second auxiliary compressor 1044, the second auxiliary condenser 1043, another fluid channel of the second auxiliary throttle valve 1042 and another fluid channel of the second subcooler 1041 are sequentially connected through the second auxiliary refrigerant pipe 1045 to form a compression refrigeration cycle.

As a preferable scheme, the main refrigerant compression refrigeration cycle unit may further include a plurality of main evaporators connected in parallel, as shown in the system 100A in fig. 2, that is, the system 100A is a multiple refrigeration system, and provides refrigeration for a plurality of devices or systems.

The system 200 shown in fig. 3 includes a main refrigerant compression refrigeration cycle unit and an auxiliary refrigerant compression refrigeration cycle unit, and the main refrigerant compression refrigeration cycle unit includes a main compressor 201, a main condenser 202, a subcooler 2031, a main throttle valve 204, a main evaporator 205, a main refrigerant pipeline 206, and the like. The main refrigerant compression system connects the components through a main refrigerant pipeline 206 in a known refrigerant refrigeration system connection manner to form a refrigerant compression refrigeration cycle, and the subcooler 2031 is located downstream of the main condenser and upstream of the main throttle valve 204 and performs large temperature difference subcooling on a high-pressure refrigerant after the condensation process is finished. The number of the auxiliary refrigerant compression refrigeration cycle units may be one or two, and fig. 3 includes two auxiliary refrigerant compression refrigeration cycle units, that is: the first auxiliary refrigerant compression refrigeration cycle unit includes a first auxiliary evaporator 20311, a first auxiliary throttle 20312, a first auxiliary condenser 20313, a first auxiliary compressor 20314, a first auxiliary refrigerant pipe 20315, and the like. The second auxiliary refrigerant compression refrigeration cycle unit includes a second auxiliary evaporator 20321, a second auxiliary throttle 20322, a second auxiliary condenser 20323, a second auxiliary compressor 20324, a second auxiliary refrigerant pipe 20325, and the like. The first auxiliary refrigerant compression refrigeration cycle unit and the second auxiliary refrigerant compression refrigeration cycle unit are connected with each other through refrigerant pipelines according to a known refrigerant refrigeration system connection mode to form a refrigerant compression refrigeration cycle.

The system further comprises a secondary refrigerant pipeline 2033, the secondary refrigerant pipeline is sequentially connected with the secondary refrigerant channels of the first auxiliary evaporator 20311, the second auxiliary evaporator 20321 and the subcooler 2031 to form a loop, secondary refrigerant circulates between the auxiliary evaporator and the subcooler through a pump 2032, and refrigerating capacity of the auxiliary evaporator is subcooled through a subcooling device through secondary refrigerant circulation.

The difference between the system 200A in fig. 4 and the system in fig. 3 is that fig. 4 includes two main refrigerant compression refrigeration cycle units, the two main refrigerant compression refrigeration cycle units share two auxiliary refrigerant compression refrigeration cycle units, and the inlet and the outlet of the other fluid channel of the subcooling device of each main refrigerant compression refrigeration cycle unit and the coolant channels of the first and second auxiliary evaporators 20311 and 20321 of the two auxiliary refrigerant compression refrigeration cycle units form a loop and share the same loop.

The system 300 shown in fig. 5 includes a main refrigerant compression refrigeration cycle unit, an auxiliary refrigerant compression refrigeration cycle unit, and a cold storage container 3034 for storing secondary refrigerant, the main refrigerant compression refrigeration cycle unit includes a main compressor 301, a main evaporator 305, a main condenser 302, a main throttle valve 304, a subcooler 3031, and a main refrigerant pipeline 306, the main refrigerant compression system connects the components through the main refrigerant pipeline 306 according to a known refrigerant refrigeration system connection method to form a refrigerant compression refrigeration cycle, the subcooler 3031 is located downstream of the main condenser 302 and upstream of the main throttle valve 304, and performs a large subcooling temperature difference on a high-pressure refrigerant after a condensation process is completed. The auxiliary refrigerant compression refrigeration cycle unit comprises an auxiliary evaporator 30343, an auxiliary condenser 30346, an auxiliary compressor 30347, an auxiliary throttle valve 30345 and an auxiliary refrigerant pipeline 30348, wherein the auxiliary refrigerant compression system connects all the components through the refrigerant pipeline 30348 according to a known refrigerant compression refrigeration system connection mode to form a refrigerant compression refrigeration cycle. A first inlet, a first outlet, a second inlet and a second outlet are respectively arranged on two sides of the cold accumulation container 3034, the first outlet and the first inlet are respectively connected with an inlet and an outlet of another fluid channel of the subcooler 3031 through a secondary refrigerant pipeline 3033 to form a first loop, the pump 3032 drives the secondary refrigerant to circulate between the cold accumulation container 3034 and the subcooler 3031, the second outlet of the cold accumulation container 3034, the second inlet is connected with an inlet and an outlet of the fluid channel of the auxiliary evaporator 30343 to form a second loop, and the pump 30341 drives the secondary refrigerant to circulate between the container and the auxiliary evaporator. When the first loop circulates, the secondary refrigerant is used for supercooling the refrigerant of the main refrigerant compression refrigeration cycle unit through the supercooling device, and when the second loop circulates, the auxiliary refrigerant compression refrigeration cycle unit is used for refrigerating the secondary refrigerant. The first circuit and the second circuit may or may not be circulated simultaneously. Controlled by coolant valves, not shown, disposed in the circuit.

Furthermore, the time-of-use electricity price system can be used for saving energy, namely the second loop circulation is started to carry out cold storage, such as cooling by using water and the like, when the electricity price is low, such as the peak-valley flat price, and the first loop circulation is started to carry out supercooling on the refrigerant of the main refrigerant compression refrigeration circulation unit when the electricity price is high and the peak-valley flat price.

In the system 300A shown in fig. 6, the cooling tower is used to cool the secondary refrigerant or water in the cold storage container, for example, when the temperature difference between day and night is large, the cooling tower can be used to cool the secondary refrigerant or water at night, and the secondary refrigerant or water can be used to subcool the refrigerant of the main refrigerant compression refrigeration cycle unit during day.

Further, the system 300A may be provided with an auxiliary refrigerant compression refrigeration cycle unit, that is: and a second outlet and a second inlet of the cold accumulation container are connected with an inlet and an outlet of the cooling tower and an inlet and an outlet of another fluid channel of the auxiliary evaporator of the auxiliary refrigerant compression refrigeration cycle unit, when the cooling tower meets the cooling requirement, the cooling tower is used, otherwise, the auxiliary refrigerant compression refrigeration cycle unit is adopted.

Systems 300 and 300A are not capable of providing continuous subcooling to the primary system with coolant in the containers, and systems 400 and 400A are capable of providing continuous subcooling to the primary system by using two containers in alternation.

As shown in fig. 7, the system 400 includes a main refrigerant compression refrigeration cycle unit, an auxiliary refrigerant compression refrigeration cycle unit, and two cold storage containers 4034A and 4034B, the main refrigerant compression refrigeration cycle unit includes a main compressor 401, a main evaporator 405, a main condenser 402, a main throttle 404, a subcooler 4031, and a main refrigerant pipe 406, the main refrigerant compression refrigeration cycle unit connects the components by a refrigerant pipe 406 according to a known refrigerant refrigeration system connection method to form a refrigerant compression refrigeration cycle, the subcooler 4031 is located downstream of the main condenser 402 and upstream of the main throttle 404, the auxiliary refrigerant compression refrigeration cycle unit includes an auxiliary evaporator 40343, an auxiliary condenser 40346, an auxiliary compressor 40347, an auxiliary throttle 30435, and an auxiliary refrigerant pipe 40348, the auxiliary refrigerant compression system connects all the components through a refrigerant pipeline 40348 according to a known refrigerant refrigeration system connection mode to form a refrigerant compression refrigeration cycle for performing large-temperature difference supercooling on a high-pressure refrigerant after the condensation process is finished. Two sides of the two cold accumulation containers 4034A and 4034B are respectively provided with a first inlet, a first outlet, a second inlet and a second outlet, the first outlet and the first inlet are respectively connected with an inlet and an outlet of another fluid channel of the subcooler 4031 of the main refrigerant compression refrigeration cycle unit through a secondary refrigerant pipeline 4033 to form a first loop, the secondary refrigerant pipeline 4033 is further provided with a pump 4032, the secondary refrigerant is driven by the pump 4032 to circulate in the subcooler 4031 and the two cold accumulation containers 4034A and 4034B, the second outlets and the second inlets of the two cold accumulation containers are respectively connected with the auxiliary evaporator 40343 of the auxiliary refrigerant compression refrigeration cycle unit through a secondary refrigerant pipeline 40342 to form a second loop, the secondary refrigerant pipeline 40342 is provided with a pump 40341, and the secondary refrigerant is driven by the pump 40341 to circulate in the auxiliary evaporator 40343 and the two containers 4034A and 4034B. Valves are further mounted on the secondary refrigerant pipelines 4033 and 40342, and through valve control, a first loop and a second loop of the two containers can respectively operate, when the first loops circulate, the secondary refrigerant supercools the refrigerant of the main refrigerant compression refrigeration cycle unit through the supercooling device, and when the second loops circulate, the secondary refrigerant compression refrigeration cycle unit refrigerates the secondary refrigerant. The two cold accumulation containers are controlled by the valve to only carry out one loop circulation, and the loop circulation of the two cold accumulation containers is different, so that the secondary refrigerant in the containers is alternately heated and cooled, namely: the first cold accumulation container runs a first loop cycle, the secondary refrigerant is heated by the main refrigerant compression refrigeration cycle unit, namely the secondary refrigerant overcools the refrigerant in the main refrigerant compression refrigeration cycle unit, the second cold accumulation container runs a second loop cycle, the secondary refrigerant is cooled by the auxiliary refrigerant compression refrigeration cycle unit, through valve switching, the first cold accumulation container is switched to the second loop cycle, the heated secondary refrigerant becomes cooled by the auxiliary refrigerant compression refrigeration cycle unit, the second cold accumulation container is switched to the first loop cycle cooled secondary refrigerant to be switched to a heating mode, and the cooled secondary refrigerant is heated by the main refrigerant compression refrigeration cycle unit.

The system 400A of fig. 8 differs from the system 400 of fig. 7 in that the system includes two refrigerant compression refrigeration cycle units, each corresponding to two cold storage containers.

FIG. 9 shows a system for producing low-temperature chilled water in an electronic factory, where the low-temperature chilled water is chilled water entering an evaporator of a refrigerator at a temperature of 10-15 ℃ and chilled water discharged from the evaporator at a temperature of 3-9 ℃. The device is mainly used for fresh air dehumidification and the like.

The figure shows that the temperature of the refrigerant from the outlet of the condenser is 40 ℃, then the refrigerant is cooled to 17 ℃ through the subcooler, the water with the temperature of 14 ℃ is introduced into the cold water channel of the subcooler, the temperature is raised to 35 ℃, and then the refrigerant returns to the reservoir, namely the cold accumulation container, which is not shown in the figure, namely a container for cold accumulation, namely the cold accumulation can be used when the electricity price is low at night or low in daytime, and the cold accumulation is used when the electricity price is high. The water with the temperature of 7 ℃ can be prepared by the low-temperature water cooler comprising the subcooler, namely the water with the temperature of 7 ℃ prepared by the evaporator of the low-temperature water cooler is sent to the tail end for use, and the temperature of the water returning from the tail end is 12 ℃.

The evaporating temperature of the high-temperature water chiller in the system is higher than that of the medium-temperature water chiller, and water at 35 ℃ from the water tank firstly passes through the high-temperature water chiller and then is cooled by the medium-temperature water chiller and then returns to the water tank. The COP of the medium-temperature water chiller and the high-temperature water chiller is higher than that of the low-temperature water chiller, so that energy is saved, and the COP of the high-temperature water chiller is higher than that of the medium-temperature water chiller, so that more energy is saved than that of the medium-temperature water chiller.

The reservoir can utilize a fire pool of an electronic factory.

FIG. 10 is another system for producing medium-temperature chilled water in an electronic factory, where the medium-temperature chilled water is chilled water at a temperature of 18-22 ℃ entering an evaporator of a refrigerator and at a temperature of 10-15 ℃ discharged from the evaporator. Mainly for the dryer side duct, i.e. the non-dehumidifying fan coil, and for process cooling.

The figure shows that the medium temperature chilled water is 14-21 ℃, namely the evaporator produces water with 14 ℃ and sends the water to the tail end for use, and the temperature of the water returning from the tail end is 21 ℃.

The system adopts a large-scale centrifugal compressor, cooling water is used for cooling a condenser, the cooling water comes from a cooling tower, the cooling tower, a subcooler, an expansion valve and an evaporator are not shown in the figure to form a refrigeration cycle, the temperature of a refrigerant at the outlet of the condenser is shown in the figure to be 40 ℃, then the refrigerant is cooled to 15 ℃ through the subcooler, water with the temperature of 10 ℃ is introduced into a cold water channel of the subcooler, the temperature is raised to 35 ℃, and then the refrigerant returns to a reservoir, namely a cold accumulation container, two reservoirs, namely a cold accumulation container, are shown in the figure, one cold accumulation container is connected with a cold accumulation water cooler, the other cold accumulation container is connected with the subcooler, and the two reservoirs can be switched through a valve. The valves are not shown.

One container in the figure can utilize a fire pool, and another pool is added, or some isolation modification is performed to enable both containers to utilize a fire pool.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should all embodiments be exhaustive. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.