CN-117109200-B - Solar refrigeration system with cold accumulation function and control method thereof

CN117109200BCN 117109200 BCN117109200 BCN 117109200BCN-117109200-B

Abstract

The invention discloses a solar refrigerating system with a cold accumulation function, which comprises a solar absorption refrigerating device, a vapor compression refrigerating device, a cold accumulation device and a controller, wherein the solar absorption refrigerating device comprises a solar heat collector and an absorption refrigerating system, the absorption refrigerating system comprises a generator, a first condenser, a first throttle valve, a first evaporator and an absorber, and vapor or hot water generated by the solar heat collector is used as a heat source of the absorption refrigerating system. The solar refrigerating system with the cold accumulation function and the control method thereof solve the problem of energy waste caused by closing the absorption refrigerating system or simultaneously opening the absorption refrigerating system and refrigerating in other modes in the prior art, can maximally utilize solar resources, and fully utilize the advantages of the absorption refrigerating system.

Inventors

LI MANFENG
LI YONGBING
HE SHENGNAN
QI RUI
ZHANG LINLIN
YIN KUI
ZHENG WENJUAN

Assignees

中建三局第一建设安装有限公司

Dates

Publication Date: 20260512
Application Date: 20230307

Claims (7)

1. The solar refrigerating system with the cold accumulation function comprises a solar absorption refrigerating device, wherein the solar absorption refrigerating device comprises a solar heat collector and an absorption refrigerating system, the absorption refrigerating system comprises a generator, a first condenser, a first throttle valve, a first evaporator and an absorber, and steam or hot water generated by the solar heat collector is used as a heat source of the absorption refrigerating system, and the solar refrigerating system is characterized by further comprising: the vapor compression type refrigerating device comprises a compressor, a second condenser, a second throttle valve and a second evaporator; The cold accumulation device is internally provided with a cold accumulation medium; A controller; Wherein the water outlet pipe of the first evaporator is connected with the cold accumulation water inlet pipe of the cold accumulation device through a first water supply pipe, the water outlet pipe of the first evaporator is also connected with a water supply main pipe through a second water supply pipe, the water supply main pipe is used for conveying chilled water to a user, the water inlet pipe of the first evaporator is connected with the cold accumulation water return pipe of the cold accumulation device through a first water return pipe, the water inlet pipe of the first evaporator is connected with a water return main pipe through a second water return pipe, the water return main pipe is used for conveying water on the user side, The water outlet pipe of the second evaporator is connected with the water supply main pipe through a third water supply pipe, and the water inlet pipe of the second evaporator is connected with the water return main pipe through a third water return pipe; the cold accumulation device is connected with the water supply main pipe through a fourth water supply pipe, and is connected with the water return main pipe through a fourth water return pipe; The hot water supply end of the solar heat collector is connected with the heat source inlet end of the generator through a heat source water supply pipe, the heat source outlet end of the generator is connected with the hot water return end of the solar heat collector through a heat source water return pipe, a first temperature sensor is arranged on the heat source water supply pipe, a second temperature sensor is arranged on the heat source water return pipe, and the first temperature sensor and the second temperature sensor are both connected with the controller; the first water supply pipe, the second water supply pipe, the third water supply pipe, the fourth water supply pipe, the first water return pipe, the second water return pipe, the third water return pipe and the fourth water return pipe are all provided with flow regulating valves connected with the controller; The heat exchange area of the first evaporator can be adjusted, and the controller is used for controlling the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor to be different T adjusts the heat transfer area of first evaporimeter, reduces first evaporimeter heat transfer area when deltaT increases, increases first evaporimeter heat transfer area when deltaT reduces.
2. The solar refrigeration system with cold storage function according to claim 1, wherein the cold storage medium is water or an inorganic salt water solution.
3. The solar refrigeration system with cold accumulation function according to claim 1, wherein the first evaporator comprises a first heat exchanger and a second heat exchanger, wherein the heat exchange area of the first heat exchanger is a first heat exchange area F1, and the heat exchange area of the second heat exchanger is a second heat exchange area F2.
4. A solar refrigeration system with cold storage function according to claim 3, wherein the first heat exchanger and the second heat exchanger are arranged in parallel or in series.
5. A method for controlling a solar refrigeration system with cold accumulation function, which is implemented by using the solar refrigeration system with cold accumulation function as set forth in any one of claims 1 to 4, characterized in that the first evaporator is arranged in an absorption refrigeration system in a solar absorption refrigeration device, and the first evaporator comprises a first heat exchange area F1 and a second heat exchange area F2, f2=β×f1, wherein 1< β is less than or equal to 2.
6. The method according to claim 5, wherein the controller calculates the difference between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor T, adjusting the heat exchange area of the first evaporator; Wherein the controller is used for controlling the temperature according to the difference between the temperature T1 detected by the first temperature sensor and the temperature T2 detected by the second temperature sensor T adjusts the heat transfer area of first evaporimeter includes following step: If it is The solar absorption refrigeration device is started, the vapor compression refrigeration device and the cold accumulation device are closed, and the controller controls the first evaporator to adjust to a first heat exchange area; If it is The solar absorption refrigeration device is started, the vapor compression refrigeration device is closed, and the controller controls the first evaporator to adjust to the second heat exchange area, wherein And (2) and And closing the cold accumulation mode and the cold discharge mode of the cold accumulation device; Wherein the method comprises the steps of Cop is the refrigeration coefficient of the absorption refrigeration system, cop=refrigerating capacity of the system/heat supply capacity of the system; water flow for the heat source water supply pipe; the water temperature in the water outlet pipe of the first evaporator; the water temperature in the water inlet pipe of the first evaporator; Is known as And Under the condition, the refrigerating water flow meeting the cooling capacity requirement of the user.
7. The control method of a solar refrigeration system with a cold storage function according to claim 6, further comprising: If it is A kind of electronic device Simultaneously closing the solar absorption refrigeration device and the vapor compression refrigeration device, and opening a cold discharging mode of the cold accumulation device, wherein Is the cold accumulation amount of the cold accumulation device, The cold energy demand is the user; If it is A kind of electronic device The solar absorption refrigeration device and the cold storage device are closed to discharge cold, the vapor compression refrigeration device is opened, If it is The solar absorption refrigeration device is started, the vapor compression refrigeration device is closed, the controller controls the first evaporator to adjust to the second heat exchange area, and the cold accumulation mode of the cold accumulation device is started, wherein ≥1.6。

Description

Solar refrigeration system with cold accumulation function and control method thereof Technical Field The invention relates to the technical field of solar refrigeration, in particular to a solar refrigeration system with a cold accumulation function and a control method thereof. Background Solar energy is used as renewable energy, the application of the renewable energy is more and more extensive, a system for refrigerating by utilizing the solar energy is available at present, however, the solar energy has uncertainty and is closely related to weather change, and when the solar energy resource is insufficient, how to meet the cold energy requirement of a user becomes a difficult problem to be solved urgently. The solar energy refrigerating system mainly comprises a solar energy absorption refrigerating system, a solar energy absorption refrigerating system and a solar energy injection refrigerating system, wherein, The absorption refrigeration system works on the principle that a liquid refrigerant absorbs heat and evaporates in an evaporator, the formed vapor is absorbed by an absorbent, after which the absorbent, which absorbs the refrigerant vapor, is pumped by a solution to a generator, heated in the generator, and the refrigerant vapor is separated, condensed into a liquid in a condenser, throttled and then enters the evaporator. However, in the existing absorption refrigeration system, when the heat source of the generator is insufficient and the cold energy provided by the absorption refrigeration system cannot meet the requirement, the absorption refrigeration system is usually turned off directly and other modes are adopted for refrigeration, the slightly insufficient heat source is not utilized any more, so that energy waste is caused, or the absorption refrigeration system and other refrigeration devices are turned on at the same time, however, various refrigeration devices are turned on at the same time, the operation and maintenance cost is high, and resources are wasted. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a solar refrigeration system with a cold accumulation function and a control method thereof, and aims to solve the problems. In order to achieve the above purpose, the present invention provides the following technical solutions: The solar refrigerating system with the cold accumulation function comprises a solar absorption refrigerating device, wherein the solar absorption refrigerating device comprises a solar heat collector and an absorption refrigerating system, the absorption refrigerating system comprises a generator, a first condenser, a first throttle valve, a first evaporator and an absorber, steam or hot water generated by the solar heat collector is used as a heat source of the absorption refrigerating system, and the solar refrigerating system further comprises: the vapor compression type refrigerating device comprises a compressor, a second condenser, a second throttle valve and a second evaporator; The cold accumulation device is internally provided with a cold accumulation medium; A controller; Wherein the water outlet pipe of the first evaporator is connected with the cold accumulation water inlet pipe of the cold accumulation device through a first water supply pipe, the water outlet pipe of the first evaporator is also connected with a water supply main pipe through a second water supply pipe, the water supply main pipe is used for conveying chilled water to a user, the water inlet pipe of the first evaporator is connected with the cold accumulation water return pipe of the cold accumulation device through a first water return pipe, the water inlet pipe of the first evaporator is connected with a water return main pipe through a second water return pipe, the water return main pipe is used for conveying water on the user side, The water outlet pipe of the second evaporator is connected with the water supply main pipe through a third water supply pipe, and the water inlet pipe of the second evaporator is connected with the water return main pipe through a third water return pipe; the cold accumulation device is connected with the water supply main pipe through a fourth water supply pipe, and is connected with the water return main pipe through a fourth water return pipe; The hot water supply end of the solar heat collector is connected with the heat source inlet end of the generator through a heat source water supply pipe, the heat source outlet end of the generator is connected with the hot water return end of the solar heat collector through a heat source water return pipe, a first temperature sensor is arranged on the heat source water supply pipe, a second temperature sensor is arranged on the heat source water return pipe, and the first temperature sensor and the second temperature sensor are both connected with the controller; the first water supply pipe, the second water supply pipe, the third water supply pipe, the