阅读说明：本技术 一种太阳能喷射制冷系统的调控装置及方法 (Regulating and controlling device and method for solar jet refrigeration system ) 是由 王菲 张瀚禹 孟胜强 王雷浩 于 2021-10-08 设计创作，主要内容包括：本发明公开了一种利用太阳能进行供冷的喷射制冷系统的调控装置及方法,装置包括太阳能蓄热循环回路、取热循环回路、制冷剂循环回路、空调冷水循环回路和自动控制装置；太阳能蓄热循环回路通过蓄热器与取热循环回路相连,取热循环回路通过发生器与制冷剂循环回路相连,制冷剂循环回路和空调冷水循环回路通过蒸发器相连；制冷剂循环回路的发生器出口管路上设有获取发生器出口温度和压强的压力传感器和温度传感器,由控制器控制变频泵的频率和转速来调节发生器出口制冷剂的温度和压力,使喷射制冷循环在不同太阳辐射下保持在发生器设计工况下。该调控装置和方法提高了制冷子循环的制冷效率,从而实现了对太阳能的高效利用。(The invention discloses a regulation and control device and a regulation and control method of a jet refrigeration system for supplying cold by utilizing solar energy, wherein the device comprises a solar heat storage circulation loop, a heat taking circulation loop, a refrigerant circulation loop, an air conditioner cold water circulation loop and an automatic control device; the solar heat storage circulation loop is connected with the heat taking circulation loop through the heat accumulator, the heat taking circulation loop is connected with the refrigerant circulation loop through the generator, and the refrigerant circulation loop is connected with the air conditioner cold water circulation loop through the evaporator; a generator outlet pipeline of the refrigerant circulation loop is provided with a pressure sensor and a temperature sensor for acquiring the temperature and the pressure of the generator outlet, and the controller controls the frequency and the rotating speed of the variable frequency pump to adjust the temperature and the pressure of the generator outlet refrigerant, so that the jet refrigeration cycle is kept under the design working condition of the generator under different solar radiation. The regulation and control device and the regulation and control method improve the refrigeration efficiency of the refrigeration sub-cycle, thereby realizing the high-efficiency utilization of solar energy.)

1. A regulation and control device of a solar jet refrigeration system comprises a solar heat storage circulation loop, a heat taking circulation loop, a refrigerant circulation loop, an air conditioner cold water circulation loop and an automatic control device; the method is characterized in that: the solar heat storage circulation loop is connected with the heat taking circulation loop through a heat accumulator (C), the heat taking circulation loop is connected with the refrigerant circulation loop through a generator (E), and the refrigerant circulation loop is connected with the air conditioner cold water circulation loop through an evaporator (I);

the solar heat storage circulation loop comprises a solar heat collector (A), a circulating water pump (B) and a heat storage tank (C) which are sequentially connected in series through pipelines;

the heat taking circulation loop comprises a heat storage tank (C), a variable frequency pump (D) and a generator (E) which are sequentially connected in series through pipelines;

the refrigerant circulation loop comprises an ejector (F), a generator (E) connected with a working fluid inlet of the ejector (F) and a condenser (G) connected with an outlet of the ejector (F), wherein an outlet of the condenser (G) is divided into two paths: one path returns to the generator (E) after passing through the refrigerant pump (J) through a pipeline; the other path of the mixed gas passes through a throttle valve (H) and an evaporator (I) in sequence through a pipeline and returns to an injection fluid inlet of an injector (F);

the air conditioner cold water circulation loop comprises an evaporator (I) and a user end connected with the evaporator (I);

the automatic control device comprises a pressure sensor (P), a temperature sensor (T) and a controller (M); the outlet of the controller (M) is connected with a variable frequency pump (D) in the heat taking circulation loop, the outlets of the pressure sensor (P) and the temperature sensor (T) are respectively connected with the inlet of the controller (M), and the inlets of the pressure sensor (P) and the temperature sensor (T) are connected on a pipeline of the outlet of the generator (E) in parallel.

2. A method for regulating a solar spray refrigeration system using the regulation device of claim 1, comprising the steps of:

during operation, temperature sensor (T) and pressure sensor (P) acquire the outlet temperature and the outlet pressure of generator (E) in the refrigerant circulation circuit respectively, and transmit the pressure signal and the temperature signal who acquire for controller (M), controller (M) compares the temperature signal value and the pressure signal value of receiving with the temperature value and the pressure value of settlement, according to the size that the received signal deviates from the settlement signal, send regulation and control output signal to inverter pump (D), adjust the rotational speed of inverter pump (D) in real time, make the outlet temperature value and the outlet pressure value of generator (E) stabilize near the settlement temperature value and the pressure value corresponding with sprayer (F), and then guarantee solar energy and spray refrigerating system's high-efficient operation, improve the solar energy utilization ratio, and alleviate air conditioner power consumption pressure.

3. The control method of the regulation device according to claim 1, characterized in that:

when the temperature and the pressure of the gas at the outlet of the generator (E) are lower than the set temperature and the set pressure at the inlet of the ejector, the rotating speed of the electronic variable frequency pump (D) is increased by regulating and controlling an output signal through the controller (M);

when the temperature and the pressure of the gas at the outlet of the generator (E) are higher than the designed inlet temperature and the designed inlet pressure of the ejector, the controller (M) regulates and controls the output signal to reduce the rotating speed of the electronic variable frequency pump (D).

Technical Field

The invention relates to the technical field of new energy refrigeration, in particular to a regulating and controlling device and method of a solar jet refrigeration system.

Background

With the increase of energy shortage and environmental protection pressure, the application of solar energy is gradually emphasized. The seasonal adaptability of solar refrigeration is good, and the refrigerating capacity of the system is larger when the weather is hotter and the refrigerating capacity demand is larger. Compared with other refrigeration methods, the solar jet refrigeration method has a simple structure and low installation cost and maintenance cost, and has attracted extensive attention in recent years. However, solar radiation has the characteristics of low energy density and large fluctuation of radiation intensity under the influence of weather, so the operation condition of the solar jet refrigeration system is very easy to change under the influence of environment. The traditional solar jet refrigeration system only has one ejector, the ejector is fixed in structural size and is often designed according to a specific design working condition, and when the actual working condition deviates, the performance of the ejector and the jet refrigeration system is reduced or the ejector and the jet refrigeration system cannot work. However, the circulation pump of the heat-taking circulation loop of the conventional solar injection system is fixed-frequency, that is, the circulation flow rate cannot be changed at will, so that along with the change of solar radiation, the heat exchange amount of the generator is possibly insufficient or redundant compared with the design value, which causes the deviation of the system working condition and the performance reduction.

The prior art mostly adopts an adjustable ejector or a plurality of ejectors with different structures to be arranged in parallel to solve the problem. When the actual working condition deviates from the design working condition, the novel working condition is adapted by changing the internal structure of the adjustable injector or selecting the injector structure which is most matched with the working condition. Although the two methods are feasible, the adjustable ejector is complex to process and difficult to adjust, leakage can occur due to the sealing problem, the mode of arranging a plurality of ejectors in parallel can only adjust a limited number of working conditions due to the limitation of the number of the ejectors, the mode increases the manufacturing cost of the whole system, the installation is more complex, the requirement on the installation space of equipment is increased, a plurality of adjusting valves need to be controlled simultaneously, and the control procedure is complicated.

Disclosure of Invention

The technical problem is as follows: the invention aims to overcome the defects in the prior art and provides a regulating and controlling device and method of a solar jet refrigeration system. When the working condition of the solar jet refrigeration system deviates in the actual operation, the heat supply amount is changed by adjusting the rotating speed of the variable frequency pump in the heat taking cycle, so that the problem that the working condition of the solar jet refrigeration system often deviates in the actual operation is solved.

The technical scheme is as follows: the invention discloses a regulation and control device of a solar jet refrigeration system, which comprises a solar heat storage circulation loop, a heat taking circulation loop, a refrigerant circulation loop, an air conditioner cold water circulation loop and an automatic control device.

The solar heat storage circulation loop comprises a solar heat collector, a circulating water pump and a heat accumulator which are sequentially connected in series;

the heat taking circulation loop comprises a heat accumulator, a variable frequency pump and a generator which are sequentially connected in series;

the refrigerant circulation loop comprises an ejector, a generator connected with an ejector working fluid inlet and a condenser connected with an ejector outlet, wherein the outlet of the condenser is divided into two paths: one path returns to the generator after passing through a refrigerant pump through a pipeline; the other path of the mixed gas passes through a throttle valve and an evaporator in sequence through a pipeline and returns to an injection fluid inlet of the ejector.

The air conditioner cold water circulation loop comprises an evaporator and a user end connected with the evaporator through a pipeline.

The automatic control device comprises a pressure sensor, a temperature sensor and a controller; the outlet of the controller is connected with a variable frequency pump in the heat taking circulation loop, the outlets of the pressure sensor and the temperature sensor are respectively connected with the inlet of the controller, and the inlets of the pressure sensor and the temperature sensor are connected on a pipeline of the outlet of the generator in parallel.

The control method of the automatic control device is characterized by comprising the following steps:

during operation, temperature sensor and pressure sensor acquire the outlet temperature and the outlet pressure of generator in the refrigerant circulation circuit respectively, and give the controller with pressure signal and temperature signal transmission acquireing, the controller is with the temperature signal value and the pressure signal value of receiving and the temperature value and the pressure value comparison of settlement, according to the size that the received signal deviates from the settlement signal, send the control output signal for the variable frequency pump, adjust the rotational speed of variable frequency pump in real time, make the outlet temperature value and the outlet pressure value of generator stabilize near the settlement temperature value and the pressure value corresponding with the sprayer, and then guarantee solar energy and spray refrigerating system's high-efficient operation, improve the solar energy utilization ratio, and alleviate air conditioner power consumption pressure.

When the temperature and the pressure of the gas at the outlet of the generator are lower than the set temperature and the set pressure at the inlet of the ejector, the rotating speed of the electronic variable frequency pump is increased by regulating and controlling an output signal through the controller;

when the temperature and the pressure of the gas at the outlet of the generator are higher than the designed inlet temperature and the designed inlet pressure of the ejector, the rotating speed of the electronic variable frequency pump is reduced by regulating and controlling the output signal through the controller.

Has the advantages that: by adopting the technical scheme, the variable frequency pump and the control device are adopted in the heat taking circulation loop, the heat exchange quantity of the generator in the refrigerant circulation loop is automatically adjusted in actual operation, so that the working condition of the generator is always close to the designed working condition, the efficient operation of the solar jet refrigeration system is further ensured, the solar utilization rate is improved, the air-conditioning electricity utilization pressure is relieved, and the solar jet refrigeration system has remarkable social benefit and economic benefit. Compared with the existing adjusting mode that a fixed-frequency pump is used in a heat-taking circulation loop and an adjustable ejector or a plurality of ejectors with different structures are arranged in parallel, the solar jet refrigeration system can efficiently operate only by adopting a single ejector with a fixed structure and controlling only one part of the variable-frequency pump. When the working condition of the solar jet refrigeration system deviates in the actual operation, the heat supply amount is changed by adjusting the rotating speed of the variable frequency pump in the heat taking cycle, so that the problem that the working condition of the solar jet refrigeration system often deviates in the actual operation is solved. The adjustable hydraulic cylinder is simple in structure, lower in manufacturing cost, simpler and more effective in adjustment and has wide practicability in the technical field.

Drawings

Fig. 1 is a schematic structural diagram of a regulation and control device of a solar jet refrigeration system.

In the figure: a-solar heat collector; b, a circulating water pump; c, a heat accumulator; d, a variable frequency pump; e-a generator; f-an ejector; g, a condenser; h, a throttle valve; i-an evaporator; j-refrigerant pump; p-pressure sensor; t-temperature sensor; m-controller.

Detailed Description

An embodiment of the invention is further described below with reference to the accompanying drawings:

the invention relates to a regulation and control device of a solar jet refrigeration system, which comprises a solar heat storage circulation loop, a heat taking circulation loop, a refrigerant circulation loop, an air conditioner cold water circulation loop and an automatic control device, wherein the solar heat storage circulation loop is connected with the solar heat taking circulation loop; the solar heat storage circulation loop is connected with the heat taking circulation loop through a heat accumulator C, the heat taking circulation loop is connected with the refrigerant circulation loop through a generator E, and the refrigerant circulation loop is connected with the air conditioner cold water circulation loop through an evaporator I;

the solar heat storage circulation loop comprises a solar heat collector A, a circulating water pump B and a heat storage tank C which are sequentially connected in series through pipelines;

the heat taking circulation loop comprises a heat storage tank C, a variable frequency pump D and a generator E which are sequentially connected in series through pipelines;

the refrigerant circulation loop comprises an ejector F, a generator E connected with a working fluid inlet of the ejector F and a condenser G connected with an outlet of the ejector F, wherein an outlet of the condenser G is divided into two paths: one path returns to the generator E after passing through a refrigerant pump J through a pipeline; the other path of the liquid passes through a throttle valve H and an evaporator I in sequence through a pipeline and returns to an injection fluid inlet of an injector F;

the air conditioner cold water circulation loop comprises an evaporator I and a user end connected with the evaporator I; the user side comprises user side cold water return water and user side cold water supply, a user side cold water return pipe is connected with an inlet of the evaporator I, a valve is arranged at the inlet, and a user side cold water supply pipe is connected with an outlet of the evaporator I.

The automatic control device comprises a pressure sensor P, a temperature sensor T and a controller M; the outlet of the controller M is connected with a variable frequency pump D in the heat taking circulation loop, the outlets of the pressure sensor P and the temperature sensor T are respectively connected with the inlet of the controller M, and the inlets of the pressure sensor P and the temperature sensor T are connected in parallel on a pipeline of the outlet of the generator E.

The control method using the regulating device comprises the following specific steps:

during operation, temperature sensor T and pressure sensor P acquire the outlet temperature and the outlet pressure of generator E in the refrigerant circulation circuit respectively, and transmit the pressure signal and the temperature signal who acquire for controller M, controller M compares the temperature signal value and the pressure signal value of receiving with the temperature value and the pressure value of settlement, according to the size that the received signal deviates from the settlement signal, send regulation and control output signal to inverter pump D, adjust inverter pump D's rotational speed in real time, make generator E's outlet temperature value and outlet pressure value stabilize near the settlement temperature value and the pressure value that correspond with sprayer F, and then guarantee solar energy and spray refrigerating system's high-efficient operation, improve the solar energy utilization ratio, and alleviate air conditioner power consumption pressure.

When the temperature and the pressure of the gas at the outlet of the generator E are lower than the set temperature and the set pressure at the inlet of the ejector, the rotating speed of the electronic variable frequency pump D is increased by regulating and controlling an output signal through the controller M;

when the temperature and the pressure of the gas at the outlet of the generator E are higher than the designed inlet temperature and the designed inlet pressure of the ejector, the rotating speed of the electronic variable frequency pump D is reduced by regulating and controlling the output signal by the controller M.