阅读说明：本技术 建筑空调系统 (Building air conditioning system ) 是由 陈旭峰 李宏波 周伟 朱振涛 �田�浩 于 2020-12-15 设计创作，主要内容包括：本发明提供了一种建筑空调系统,涉及空调技术领域,解决了现有技术中存在的传统的建筑空调系统,相对难以实现宽工况的技术问题。该系统包括制冷主机,其中,制冷主机的个数至少为两台且存在有制冷主机其冷量与其他制冷主机的冷量不同；存在制冷主机为多系统制冷主机,多系统制冷主机包括至少两套压缩制冷系统,多系统制冷主机中各压缩制冷系统的冷量相同或者存在有压缩制冷系统其冷量与多系统制冷主机中其他压缩制冷系统的冷量不同。本发明用于实现宽工况,以有效避免压缩机出现低负荷率运行的状况。(The invention provides a building air conditioning system, relates to the technical field of air conditioners, and solves the technical problem that a wide working condition is relatively difficult to realize in the traditional building air conditioning system in the prior art. The system comprises at least two refrigeration hosts, wherein the refrigeration hosts have different refrigeration capacities from other refrigeration hosts; the refrigeration host is a multi-system refrigeration host which comprises at least two sets of compression refrigeration systems, and the refrigeration capacity of each compression refrigeration system in the multi-system refrigeration host is the same or different from that of other compression refrigeration systems in the multi-system refrigeration host. The invention is used for realizing wide working conditions so as to effectively avoid the condition that the compressor runs at low load rate.)

1. A building air conditioning system is characterized by comprising a refrigeration main machine, wherein,

the number of the refrigeration hosts is at least two, and the refrigeration capacity of the refrigeration hosts is different from that of other refrigeration hosts;

the refrigeration system comprises a refrigeration host machine, a multi-system refrigeration host machine and at least two sets of compression refrigeration systems, wherein the refrigeration host machine is a multi-system refrigeration host machine, the refrigeration capacity of each compression refrigeration system in the multi-system refrigeration host machine is the same or the refrigeration capacity of the compression refrigeration system is different from that of other compression refrigeration systems in the multi-system refrigeration host machine.

2. The building air conditioning system of claim 1, wherein the building air conditioning system comprises two refrigeration hosts, the refrigeration hosts having different refrigeration capacities; one of the refrigeration hosts is a multi-system refrigeration host and the refrigeration host comprises two sets of compression refrigeration systems, and the refrigeration capacities of the two sets of compression refrigeration systems in the multi-system refrigeration host are the same.

3. The building air conditioning system of claim 2, wherein the cooling capacity of the multi-system refrigeration host is less than that of another of the refrigeration hosts.

4. The building air conditioning system as claimed in claim 3, wherein the ratio of the cooling capacity of the other refrigerating main machine except the multi-system refrigerating main machine to the cooling capacity of the multi-system refrigerating main machine is 1.2-1.7.

5. The building air conditioning system as claimed in claim 3, wherein the ratio of the cooling capacity of the other refrigerating main machine except the multi-system refrigerating main machine to the cooling capacity of the multi-system refrigerating main machine is 3: 2.

6. The building air conditioning system of claim 2, wherein the other of the multiple system refrigeration hosts comprises a set of compression refrigeration system and the compressor of the compression refrigeration system is an inverter compressor or a fixed frequency compressor.

7. The building air conditioning system of claim 2, wherein another of said refrigeration hosts other than said multi-system refrigeration host comprises a compression refrigeration system and a compressor of said compression refrigeration system is a centrifugal compressor or a screw compressor.

8. The building air conditioning system of claim 2 wherein the compressors in the two sets of compression refrigeration systems in the multi-system refrigeration main unit are of the same or different construction.

9. The building air conditioning system of claim 2, wherein in the multi-system refrigeration main unit, the compressors of both sets of the compression refrigeration systems are both variable frequency compressors or both constant frequency compressors.

10. The building air conditioning system of claim 2 wherein in the multi-system refrigeration main, the compressors of both sets of the compression refrigeration systems are either both centrifugal compressors or both screw compressors.

Technical Field

The invention relates to the technical field of air conditioners, in particular to a building air conditioning system.

Background

The traditional refrigeration machine room is uniformly matched with refrigeration main machines according to the total refrigeration capacity or a plurality of large refrigeration main machines are matched with a single small refrigeration main machine, for example, the refrigeration requirement of 1000RT, the matching mode of 350RT 3 refrigeration main machines or the mode of 500RT 2 refrigeration main machines is generally adopted.

The load of the air conditioning system is in partial load for a long time, particularly the parking rate is not high at the initial stage of building use, the air conditioning system is often in lower load, the unit selection is divided by equal cooling capacity conventionally adopted, and the wide working condition and high energy efficiency are difficult to realize.

Disclosure of Invention

The invention aims to provide a building air conditioning system, which solves the technical problem that the traditional building air conditioning system in the prior art is relatively difficult to realize wide working conditions. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.

In order to achieve the purpose, the invention provides the following technical scheme:

the invention provides a building air conditioning system which comprises at least two refrigeration hosts, wherein the refrigeration hosts have different refrigeration capacities from other refrigeration hosts; the refrigeration system comprises a refrigeration host machine, a multi-system refrigeration host machine and at least two sets of compression refrigeration systems, wherein the refrigeration host machine is a multi-system refrigeration host machine, the refrigeration capacity of each compression refrigeration system in the multi-system refrigeration host machine is the same or the refrigeration capacity of the compression refrigeration system is different from that of other compression refrigeration systems in the multi-system refrigeration host machine.

Further, the building air conditioning system comprises two refrigeration hosts, and the two refrigeration hosts have different refrigeration capacities; one of the refrigeration hosts is a multi-system refrigeration host and the refrigeration host comprises two sets of compression refrigeration systems, and the refrigeration capacities of the two sets of compression refrigeration systems in the multi-system refrigeration host are the same.

Furthermore, the cold quantity of the multi-system refrigeration host is smaller than that of the other refrigeration host.

Furthermore, the ratio of the cold quantity of the other refrigerating host except the multi-system refrigerating host to the cold quantity of the multi-system refrigerating host is 1.2-1.7.

Further, the ratio of the cold quantity of the other refrigerating main machine except the multi-system refrigerating main machine to the cold quantity of the multi-system refrigerating main machine is 3: 2.

Furthermore, the other refrigeration host except the multi-system refrigeration host comprises a set of compression refrigeration system, and a compressor of the compression refrigeration system is a variable frequency compressor or a fixed frequency compressor.

Further, another refrigeration main machine except the multi-system refrigeration main machine comprises a set of compression refrigeration system, and a compressor of the compression refrigeration system is a centrifugal compressor or a screw compressor.

Further, in the multi-system refrigeration main machine, the compressors in the two sets of compression refrigeration systems have the same or different structures.

Further, in the multi-system refrigeration main machine, the compressors of the two sets of compression refrigeration systems are both variable-frequency compressors or both constant-frequency compressors.

Further, in the multi-system refrigeration main machine, the compressors of the two sets of compression refrigeration systems are both centrifugal compressors or both screw compressors.

The invention provides a building air conditioning system, which is convenient for realizing wide working conditions by different cooling capacities of various refrigeration hosts and setting the storage of the multiple system refrigeration hosts (at least two sets of compression refrigeration systems).

The preferred technical scheme of the invention can at least produce the following technical effects:

the system comprises two refrigeration main machines, namely a centrifugal cold water main machine and a double-head screw rod type cold water main machine, wherein the cold quantity ratio of the centrifugal compressor, the first screw rod type compressor and the second screw rod type compressor is 3:1:1, and wide working conditions can be realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a building air conditioning system provided by an embodiment of the present invention;

fig. 2 is a schematic view of a conventional building air conditioning system.

FIG. 1-centrifugal cold water main; 2-double-machine-head screw rod type cold water main machine; 3-a centrifugal compressor; 4-a first screw compressor; 5-a second screw compressor; 6-centrifuge evaporator; 7-centrifuge condenser; 8-a first screw machine evaporator; 9-a first screw machine condenser; 10-a second screw machine evaporator; 11-a second screw machine condenser; 12-centrifugal cold water main machine water pump; 13-centrifuge cooling water pump; 14-screw type cold water main machine water pump; 15-cooling water of a screw machine; 16-a freezing water return pipe (connected with the water inlet end of the evaporator); 17-a freezing water supply pipe (connected with the water outlet end of the host machine evaporator); 18-cooling water supply pipe (connected with the water outlet end of the condenser); 19-cooling water return pipe (connected with the water inlet end of the condenser).

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.

The invention provides a building air conditioning system, which comprises at least two refrigeration hosts, wherein the refrigeration hosts have different refrigeration capacities from other refrigeration hosts; the refrigeration host is a multi-system refrigeration host which comprises at least two sets of compression refrigeration systems, and the refrigeration capacity of each compression refrigeration system in the multi-system refrigeration host is the same or different from that of other compression refrigeration systems in the multi-system refrigeration host. The wide working condition is realized by different cold quantities of the refrigeration hosts and setting the refrigeration hosts with multiple systems; compared with the traditional scheme, the refrigerating main machine with the same refrigerating capacity is adopted, and the condition that the compressor runs at a low load rate can be effectively avoided.

As an optional implementation manner of the embodiment of the invention, the building air conditioning system comprises two refrigeration main machines, and the two refrigeration main machines have different refrigeration capacities; one of the refrigeration hosts is a multi-system refrigeration host and the refrigeration host comprises two sets of compression refrigeration systems, the refrigeration capacity of the two sets of compression refrigeration systems in the multi-system refrigeration host is the same, the two sets of compression refrigeration systems can independently operate, and the refrigeration capacity of the multi-system refrigeration host is smaller than that of the other refrigeration host. The method is used for realizing wide working conditions and improving the load factor of the compressor. For example, a multi-system refrigeration host can adopt a screw compressor system, and the screw compressor system is suitable for small cooling capacity; the other refrigeration main machine adopts a centrifugal compressor system which is suitable for large cooling capacity. Namely, the building air conditioning system adopts a mode of matching a centrifugal compressor system with a screw compressor system.

As an optional implementation mode of the embodiment of the invention, the ratio of the cold quantity of the other refrigerating host except the multi-system refrigerating host to the cold quantity of the multi-system refrigerating host is 1.2-1.7. Specifically, the following may be mentioned: the ratio of the cold quantity of the other refrigerating main machine (which can be a centrifugal cold water main machine 1) except the multi-system refrigerating main machine to the cold quantity of the multi-system refrigerating main machine (which can be a double-head screw type cold water main machine 2) is 3:2 (1.5); and because the cold quantities of the two sets of compression refrigeration systems in the multi-system refrigeration main machine are the same, referring to fig. 1, the cold quantity ratio of the centrifugal compressor 3, the first screw compressor 4 and the second screw compressor 5 is 3:1:1, and wide working conditions can be realized. Except that the cold quantity ratio of the other refrigerating main machine to the multi-system refrigerating main machine is 3:2(1.5), the ratio value formed by floating within 10% above and below the ratio (3:2) is within the protection scope of the invention.

As an optional implementation manner of the embodiment of the present invention, another refrigeration host other than the multi-system refrigeration host includes a set of compression refrigeration system, and a compressor of the compression refrigeration system is an inverter compressor or a fixed-frequency compressor. The other refrigerating main machine except the multi-system refrigerating main machine comprises a set of compression refrigerating system, and a compressor of the compression refrigerating system is a centrifugal compressor or a screw compressor. That is, another refrigeration main unit except the multi-system refrigeration main unit can be a centrifugal cold water main unit 1, that is, the compressor of the centrifugal cold water main unit is a variable-frequency centrifugal compressor 3.

As an optional implementation manner of the embodiment of the invention, in the multi-system refrigeration main machine, the compressors in the two sets of compression refrigeration systems have the same or different structures, and reasonable selection can be made according to actual conditions.

As an optional implementation manner of the embodiment of the invention, in the multi-system refrigeration host, the compressors of the two sets of compression refrigeration systems are both variable frequency compressors or both constant frequency compressors. In the multi-system refrigeration main machine, the compressors of the two compression refrigeration systems are both centrifugal compressors or screw compressors. The multi-system refrigeration main machine can be a double-head screw type cold water main machine 2 and comprises a fixed-frequency first screw type compressor 4 and a fixed-frequency second screw type compressor 5.

Example 1:

referring to fig. 1, according to the building cold requirement, taking a building central air conditioning system with total cold of 1000RT as an example, a 600RT centrifugal cold water main unit 1 is matched with a 400RT double-head screw type cold water main unit 2, wherein the 600RT centrifugal cold water main unit 1 is single-head, that is, only 1 compressor is adopted, the 400RT double-head screw type cold water main unit 2 adopts two compressors, the cold ratio of a first screw compressor 4 to a second screw compressor 5 is 1:1, that is, the cold ratio of the centrifugal compressor 3, the first screw compressor 4 and the second screw compressor 5 is 3:1: 1. When the inlet water temperature of the cooling water is 27 ℃ or above (under most conditions in summer, the actual cooling water temperature is higher than 27 ℃), the type and the proportion of the compressor are adopted, so that the load can be adjusted within the range of 10% -100%, the load rate of the compressor is over 50%, and the compressor is in an efficient operation range.

Referring to fig. 1, the building air conditioning system provided by the invention can realize wide working conditions, which are as follows:

starting a screw compressor (a first screw compressor 4 or a second screw compressor 5) at 0-200 RT;

opening two screw compressors at 200-400 RT, and adjusting at the same frequency (the load range of the screw compressors is 50-100%);

starting a centrifugal compressor 3 at 400-600 RT (the load range of the centrifugal compressor 3 is 66.7% -100%);

starting a centrifugal compressor 3 and a screw compressor at 600-800 RT (the load of the centrifugal compressor 3 is controlled to be 66.7-100%, and the load of the screw compressor is controlled to be 50-100%);

one centrifugal compressor 3 and two screw compressors are started at 800-1000 RT (the load of the centrifugal compressor 3 is controlled at 100%, and the load of the screw compressor is controlled at 50% -100%).

Referring to fig. 1, a 600RT centrifugal cold water main machine 1 is adopted to match a 400RT double-head screw type cold water main machine 2, and the load rate of the compressor is as follows:

the total load rate is 10 percent (100RT), and the load rate of a single screw compressor is 50 percent;

the total load rate is 20 percent (200RT), and the load rate of a single screw compressor is 100 percent;

the total load rate is 30 percent (300RT), and the load rate of a single screw compressor is 75 percent;

the total load rate is 40 percent (400RT), the load rate of a single screw compressor is 100 percent, or the load rate of the centrifugal compressor 3 is 66.7 percent;

the total load factor is 50% (500RT), and the load factor of the centrifugal compressor 3 is 83%;

the total load rate is 60% (600RT), and the load rate of the centrifugal compressor 3 is 100%;

the total load rate is 70 percent (700RT), the load rate of the centrifugal compressor 3 is 70 percent, and the load rate of the screw compressor is 70 percent;

the total load rate is 80 percent (800RT), the load rate of the centrifugal compressor 3 is 80 percent, and the load rate of a single screw compressor is 80 percent;

the total load rate is 90 percent (900RT), the load rate of the centrifugal compressor 3 is 90 percent, and the load rate of a single screw compressor is 90 percent;

the total load factor is 100% (1000RT), the load factor of the centrifugal compressor 3 is 100%, and the load factor of the screw compressor is 100%.

Therefore, the building air conditioning system provided by the invention can maintain the load rate of a single compressor of the system to be more than 50%, and effectively avoid the condition of low-load-rate operation.

Referring to fig. 2, the same type of main machine is used in the conventional collocation, and 1000RT is still taken as an example, that is, two 500RT centrifugal chiller units 1 have a cold quantity ratio of 1: 1.

When the system is at the total load rate of 10% (100RT), the load rate of a single centrifuge is 20%;

the total load rate is 20 percent (200RT), and the single load rate of the centrifuge is 40 percent;

the total load rate is 30 percent (300RT), and the single load rate of the centrifuge is 60 percent;

the total load rate is 40 percent (400RT), and the single load rate of the centrifuge is 80 percent;

the total load rate is 50 percent (500RT), and the load rate of a single centrifuge is 100 percent;

the total load rate is 60 percent (600RT), and the single load rate of the centrifuge is 60 percent;

the total load rate is 70 percent (700RT), and the single load rate of the centrifuge is 70 percent;

the total load rate is 80 percent (800RT), and the single load rate of the centrifuge is 80 percent;

the total load rate is 90 percent (900RT), and the single load rate of the centrifuge is 90 percent;

the total load rate is 100 percent (1000RT), and the single load rate of the centrifuge is 100 percent.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.