Composite refrigeration device

Abstract

The utility model provides a kind of composite refrigeration device, it is related to air conditioning technical field to solve the problem of the application temperature zone of existing solar energy refrigeration device is small.Composite refrigeration device, including solar energy absorption refrigeration unit, intermediate cooling unit and compression refrigeration unit, solar energy absorption refrigeration unit includes first evaporator, first evaporator is connected in the loop of intermediate cooling unit;Compression refrigeration unit includes compressor and water-cooled condenser, water-cooled condenser is connected at the export end of compressor, water-cooled condenser is connected in the loop of intermediate cooling unit.It can expand the utilization temperature zone of solar energy refrigeration device.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning technology, and more specifically, to a composite refrigeration device. Background Technology

[0002] Driven by the energy crisis and dual-carbon goals, solar energy, as a clean and renewable energy source, is receiving increasing attention in the field of refrigeration, making solar-driven refrigeration devices a research hotspot. Currently, solar-based refrigeration technologies are mainly divided into two categories: solar-driven absorption refrigeration systems and solar-powered compression refrigeration systems, each with its own limitations in practical applications.

[0003] Solar absorption cooling systems use thermal energy as a driving source, directly utilizing the heat generated by solar collectors to drive the cycle without requiring extensive electrical energy conversion. This gives them a natural advantage in energy utilization and effectively reduces carbon emissions during system operation. However, this system has significant drawbacks: firstly, its thermal energy conversion efficiency is relatively low, resulting in limited cooling capacity; secondly, the system is highly dependent on the heat source temperature. When insufficient solar radiation causes a drop in collector temperature, the cooling performance rapidly declines, leading to unstable operation.

[0004] Solar-driven compressor refrigeration systems convert solar energy into electricity using photovoltaic modules, which then drives the compressor. They offer fast cooling response, a relatively simple system structure, and easy maintenance, making them suitable for various indoor applications. However, these systems suffer from energy conversion losses, resulting in a relatively low overall energy efficiency ratio. Furthermore, in high-temperature environments, the compressor's exhaust temperature rises, increasing the pressure ratio, which not only reduces cooling capacity but also accelerates compressor wear and shortens equipment lifespan. Summary of the Invention

[0005] The first objective of this utility model is to provide a composite refrigeration device to solve the technical problem of the small application temperature range of existing solar refrigeration devices.

[0006] The first aspect of this utility model provides a composite refrigeration device, comprising a solar absorption refrigeration unit, an intermediate cooling unit, and a compression refrigeration unit. The solar absorption refrigeration unit includes a first evaporator connected in the circuit of the intermediate cooling unit. The compression refrigeration unit includes a compressor and a water-cooled condenser connected in the outlet of the compressor and in the circuit of the intermediate cooling unit.

[0007] The beneficial effects of this new composite refrigeration device are: By connecting the first evaporator of the solar absorption refrigeration unit and the water-cooled condenser of the compression refrigeration unit into the loop of the intermediate cooling unit, the solar absorption refrigeration unit can utilize low-grade heat energy, while the compression refrigeration unit can utilize high-grade heat energy, thus rationally preparing cooling capacity according to the different heat energy grades. The intermediate cooling unit can couple the solar absorption refrigeration unit and the compression refrigeration unit to achieve energy cascade utilization, thereby expanding the solar energy utilization temperature range and improving energy efficiency.

[0008] In an optional technical solution, the compression refrigeration unit further includes a second evaporator, which is connected to the inlet end of the compressor and configured to supply cooling to the room.

[0009] A second evaporator is installed in the compression refrigeration unit so that the refrigerant in the compression refrigeration unit can absorb heat and evaporate in the second evaporator. This means that the cooling capacity can be output to the outside through the second evaporator to supplement the refrigeration of the intermediate cooling unit.

[0010] In an optional technical solution, the compression refrigeration unit further includes an air-cooled condenser, which is connected to the outlet end of the compressor and in parallel with the water-cooled condenser.

[0011] Connecting the air-cooled condenser and the water-cooled condenser in parallel helps to address issues such as low refrigerant circulation in the solar absorption refrigeration unit when solar energy is insufficient, or when the refrigerant is not circulating in the solar absorption refrigeration unit. In these cases, the compressor compresses the refrigerant, which dissipates heat through the air-cooled condenser and then absorbs heat through the second evaporator to supply cooling to the room. This allows the compression refrigeration unit to operate as an air-source compression refrigeration unit, solving the intermittent operation problem of traditional solar absorption refrigeration devices.

[0012] In an optional technical solution, the outlet end of the water-cooled condenser is connected to a first throttle valve; the outlet end of the air-cooled condenser is connected to a second throttle valve; and the outlet end of the first throttle valve is connected to the outlet end of the second throttle valve.

[0013] By setting a first throttle valve and a second throttle valve for the water-cooled condenser and the air-cooled condenser respectively, the opening degree of the first throttle valve and the second throttle valve can be controlled respectively to control whether the refrigerant flows and the flow rate of the water-cooled condenser and the air-cooled condenser, so as to realize the effective utilization of the compressor output refrigerant.

[0014] In an optional technical solution, the compression refrigeration unit further includes an economizer connected between the second evaporator and the water-cooled condenser. The economizer has a gaseous refrigerant outlet and a liquid refrigerant outlet. The gaseous refrigerant outlet is connected to the medium-temperature gas injection port of the compressor, and the liquid refrigerant outlet is connected to the refrigerant inlet of the second evaporator.

[0015] In the economizer, part of the liquid refrigerant is depressurized and evaporated into a medium-pressure gas, which then enters the compressor's medium-temperature gas inlet through the gaseous refrigerant outlet. The other part of the liquid refrigerant enters the second evaporator and evaporates into a low-temperature, low-pressure gas, completing the compression refrigeration cycle. Using the economizer for gas injection and enthalpy enhancement not only lowers the compressor's discharge temperature and reduces power consumption, but also increases the subcooling of the refrigerant in the compression refrigeration unit circuit, improving the heat absorption efficiency of the second evaporator and enhancing refrigeration performance.

[0016] In an optional technical solution, the compression refrigeration unit further includes an economizer connected between the second evaporator and the water-cooled condenser. The economizer has a gaseous refrigerant outlet and a liquid refrigerant outlet. The gaseous refrigerant outlet is connected to the medium-temperature gas injection port of the compressor, and the liquid refrigerant outlet is connected to the refrigerant inlet of the second evaporator.

[0017] This configuration allows the economizer to depressurize and evaporate a portion of the liquid refrigerant discharged from the air-cooled condenser into a medium-pressure gas, which then enters the compressor's medium-temperature gas inlet through the gaseous refrigerant outlet. The remaining liquid refrigerant enters the second evaporator and evaporates into a low-temperature, low-pressure gas, completing the compression refrigeration cycle. Using the economizer for enthalpy enhancement not only lowers the compressor's discharge temperature and reduces power consumption but also increases the subcooling of the refrigerant in the compression refrigeration unit's circuit, improving the heat absorption efficiency of the second evaporator and enhancing refrigeration performance.

[0018] In an optional technical solution, the liquid refrigerant outlet is connected to the refrigerant inlet of the second evaporator via a third throttle valve.

[0019] By setting a third throttle valve to control the refrigerant flow rate discharged from the liquid refrigerant outlet of the economizer, and when the refrigerant inlet flow rate of the economizer is controlled by the first throttle valve and / or the second throttle valve, the refrigerant flow rate passing through the gaseous refrigerant outlet in the economizer can be further controlled, thereby accurately controlling the gas flow rate entering the intermediate temperature gas inlet of the compressor and reducing the compressor power consumption.

[0020] In an optional technical solution, the solar absorption refrigeration unit includes a steam generator, a condenser, and an absorber. The steam outlet of the steam generator is connected to the steam inlet of the condenser. The condenser is connected to a first evaporator through a fourth throttle valve. The first evaporator is connected to the absorber. The absorber is connected to a solution heat exchanger through a solution pump. The solution heat exchanger is connected to the steam generator.

[0021] Steam can be generated by converting absorbed solar energy into heat energy using a steam generator. After the steam is condensed in a condenser, it is evaporated by absorbing heat in a first evaporator and absorbed in an absorber. The solution is then pumped back to the steam generator.

[0022] In an optional technical solution, the solution heat exchanger has a concentrated solution side and a dilute solution side. One end of the dilute solution side is connected to the outlet of the solution pump, and the other end of the dilute solution side is connected to the steam generator. One end of the concentrated solution side is connected to the steam generator, and the other end of the concentrated solution side is connected to the absorber through a fifth throttle valve.

[0023] This setup utilizes the characteristic that the concentrated solution in the steam generator has already absorbed the heat energy converted from solar energy and its temperature has increased. Part of the heat from the concentrated solution is transferred to the dilute solution about to enter the steam generator through a solution heat exchanger, thereby increasing the temperature of the dilute solution. This makes it easier for the dilute solution to evaporate and form steam after entering the steam generator. The fifth throttle valve controls the speed at which the concentrated solution enters the absorber from the solution heat exchanger, and thus controls the rate at which heat is supplied to the dilute solution.

[0024] In an optional technical solution, the intermediate cooling unit includes a cold water heat exchanger and a cold water pump, wherein the cold water heat exchanger, the water-cooled condenser, the cold water pump and the first evaporator are connected in series to form a circulation loop.

[0025] By installing a chilled water pump in the intermediate cooling unit, the working fluid in the intermediate cooling unit can be driven by the chilled water pump to flow in the water-cooled condenser, the first evaporator and the chilled water heat exchanger, thereby rapidly supplying the chilled water that has released heat through the first evaporator to the chilled water heat exchanger to cool the room. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments or background art of this utility model, the drawings used in the description of the embodiments or background art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the composite refrigeration device provided in an embodiment of the present invention.

[0028] Figure 2 A schematic diagram of the composite refrigeration device provided in the embodiment of this utility model in Mode 1.

[0029] Figure 3 This is a schematic diagram of the composite refrigeration device provided in embodiment of the present invention in mode two.

[0030] Figure 4 A schematic diagram of the composite refrigeration device provided in this embodiment of the present invention in mode three.

[0031] Explanation of reference numerals in the attached figures: 10-Solar absorption cooling unit; 11-Steam generator; 12-Condenser; 13-Absorber; 14-Solution pump; 15-Solution heat exchanger; 16-Fourth throttle valve; 17-Fifth throttle valve; 18-Solar flat plate collector; 19-Hot water pump; 20 - Intermediate cooling unit; 21 - First evaporator; 22 - Cold water heat exchanger; 23 - Cold water pump; 30-Compression refrigeration unit; 31-Compressor; 32-Water-cooled condenser; 33-Second evaporator; 34-Air-cooled condenser; 35-First throttle valve; 36-Second throttle valve; 37-Economizer; 38-Third throttle valve. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0033] Example 1: Figure 1 This is a schematic diagram of the composite refrigeration device provided in an embodiment of the present invention. Figure 1 As shown, the composite refrigeration device provided in Embodiment 1 of this utility model includes a solar absorption refrigeration unit 10, an intermediate cooling unit 20, and a compression refrigeration unit 30. The solar absorption refrigeration unit 10 includes a first evaporator 21, which is connected to the circuit of the intermediate cooling unit 20. The compression refrigeration unit 30 includes a compressor 31 and a water-cooled condenser 32, which is connected to the outlet end of the compressor 31 and the circuit of the intermediate cooling unit 20.

[0034] By connecting the first evaporator 21 of the solar absorption refrigeration unit 10 and the water-cooled condenser 32 of the compression refrigeration unit 30 into the circuit of the intermediate cooling unit 20, the solar absorption refrigeration unit 10 can utilize low-grade heat energy, while the compression refrigeration unit 30 can utilize high-grade heat energy, thus rationally preparing cooling capacity according to the different heat energy grades. The intermediate cooling unit 20 can couple the solar absorption refrigeration unit 10 and the compression refrigeration unit 30 to achieve cascaded energy utilization, thereby expanding the solar energy utilization temperature range and improving energy efficiency.

[0035] Specifically, the first evaporator 21 in the solar absorption cooling unit 10 is named after the working fluid in the circuit of the solar absorption cooling unit 10, which absorbs heat and evaporates in the first evaporator 21. Naturally, the working fluid in the circuit of the intermediate cooling unit 20—water—releases heat to the working fluid in the circuit of the solar absorption cooling unit 10 in the first evaporator 21, and the water temperature in the intermediate cooling unit 20 will drop.

[0036] The water-cooled condenser 32 of the compression refrigeration unit 30 is based on the working fluid in the circuit of the compression refrigeration unit 30—the refrigerant, such as R134a, R32, etc. The refrigerant condenses in the water-cooled condenser 32, transferring heat to the water in the circuit of the intermediate cooling unit 20. The water, which is heated in the water-cooled condenser 32 and its temperature rises, enters the first evaporator 21 and transfers heat to the working fluid of the solar energy absorption refrigeration unit 10, causing it to evaporate.

[0037] like Figure 1 As shown, optionally, the compression refrigeration unit 30 also includes a second evaporator 33, which is connected to the inlet end of the compressor 31 and is configured to supply cooling to the room.

[0038] A second evaporator 33 is provided in the compression refrigeration unit 30 so that the refrigerant in the compression refrigeration unit 30 can absorb heat and evaporate in the second evaporator 33. This means that the cooling capacity can be output to the outside through the second evaporator 33 to supplement the cooling of the intermediate cooling unit 20.

[0039] In this embodiment, the second evaporator 33 in the compression refrigeration unit 30 is based on the evaporation of the refrigerant in the compression refrigeration unit 30 within the second evaporator 33. The composite refrigeration device in this embodiment can cool the cooling water of a building, and then use equipment such as a cooling tower to cool the circulating air in the building, thereby lowering the temperature inside the building. Therefore, the refrigerant in the second evaporator 33 absorbs heat and evaporates, that is, it absorbs heat from the cooling water of the building, causing the temperature of the cooling water to drop.

[0040] like Figure 1 As shown, optionally, the compression refrigeration unit 30 also includes an air-cooled condenser 34, which is connected to the outlet end of the compressor 31 and is connected in parallel with the water-cooled condenser 32.

[0041] Connecting the air-cooled condenser 34 and the water-cooled condenser 32 in parallel helps to address issues such as insufficient solar energy, low refrigerant circulation in the solar absorption refrigeration unit 10, or no refrigerant circulation in the solar absorption refrigeration unit 10 when solar energy is insufficient. In these cases, the compressor 31 compresses the refrigerant, which is then dissipated by the air-cooled condenser 34 and absorbs heat through the second evaporator 33 to supply cooling to the room. This allows the compression refrigeration unit 30 to operate as an air-source compression refrigeration unit, solving the intermittent operation problem of traditional solar absorption refrigeration devices.

[0042] The air-cooled condenser 34 is based on the refrigerant in the compression refrigeration unit 30 circuit, where heat is released and the temperature decreases. Specifically, the air-cooled condenser 34 can be installed outdoors, and it includes an outdoor coil and a fan. The airflow blown by the fan towards the outdoor coil carries away the heat of the refrigerant in the outdoor coil.

[0043] like Figure 1 As shown, optionally, the outlet end of the water-cooled condenser 32 is connected to a first throttle valve 35; the outlet end of the air-cooled condenser 34 is connected to a second throttle valve 36; the outlet end of the first throttle valve 35 is connected to the outlet end of the second throttle valve 36.

[0044] By setting a first throttle valve 35 and a second throttle valve 36 for the water-cooled condenser 32 and the air-cooled condenser 34 respectively, the opening degree of the first throttle valve 35 and the second throttle valve 36 can be controlled respectively to control whether the refrigerant flows and the flow rate of the water-cooled condenser 32 and the air-cooled condenser 34, so as to realize the effective utilization of the output refrigerant of the compressor 31.

[0045] like Figure 1 As shown, optionally, the compression refrigeration unit 30 also includes an economizer 37, which is connected between the second evaporator 33 and the water-cooled condenser 32. The economizer 37 has a gaseous refrigerant outlet and a liquid refrigerant outlet. The gaseous refrigerant outlet is connected to the medium-temperature gas injection port of the compressor 31, and the liquid refrigerant outlet is connected to the refrigerant inlet of the second evaporator 33.

[0046] In the economizer 37, part of the liquid refrigerant is depressurized and evaporated into a medium-pressure gas, which then enters the medium-temperature gas injection port of the compressor 31 through the gaseous refrigerant outlet. The other part of the liquid refrigerant enters the second evaporator 33 and evaporates into a low-temperature, low-pressure gas, completing the compression refrigeration cycle. Using the economizer 37 for gas injection and enthalpy enhancement not only lowers the discharge temperature of the compressor 31 and reduces its power consumption, but also increases the subcooling of the refrigerant in the circuit of the compression refrigeration unit 30, improving the heat absorption efficiency of the second evaporator 33 and enhancing refrigeration performance.

[0047] Specifically, after the high-pressure liquid refrigerant enters the economizer 37, it undergoes throttling and expansion, absorbing heat from the other refrigerant and evaporating, thus further reducing the temperature of the other refrigerant (i.e., subcooling) before entering the second evaporator 33 for refrigeration. In other words, the refrigerant entering the second evaporator 33 is at a lower temperature, improving the heat absorption efficiency of the second evaporator 33, and consequently increasing its refrigeration capacity.

[0048] like Figure 1 As shown, optionally, the economizer 37 is connected between the second evaporator 33 and the air-cooled condenser 32.

[0049] This configuration allows the economizer 37 to depressurize and evaporate a portion of the liquid refrigerant discharged from the air-cooled condenser 32 into a medium-pressure gas, which then enters the medium-temperature gas inlet of the compressor 31 through the gaseous refrigerant outlet. The remaining liquid refrigerant enters the second evaporator 33 and evaporates into a low-temperature, low-pressure gas, completing the compression refrigeration cycle. Using the economizer 37 for enthalpy enhancement not only lowers the discharge temperature of the compressor 31 and reduces its power consumption, but also increases the subcooling of the refrigerant in the compression refrigeration unit 30 circuit, improving the heat absorption efficiency of the second evaporator 33 and enhancing refrigeration performance.

[0050] like Figure 1 As shown, optionally, the liquid refrigerant outlet is connected to the refrigerant inlet of the second evaporator 33 via a third throttle valve 38.

[0051] By setting a third throttle valve 38, the flow rate of refrigerant discharged from the liquid refrigerant outlet of the economizer 37 can be controlled. When the refrigerant inlet flow rate of the economizer 37 is controlled by the first throttle valve 35 and / or the second throttle valve 36, the flow rate of refrigerant passing through the gaseous refrigerant outlet in the economizer 37 can be further controlled, thereby accurately controlling the gas flow rate entering the medium-temperature gas inlet of the compressor 31 and reducing the power consumption of the compressor 31.

[0052] Among them, the third throttle valve 38 can be an electronic expansion valve.

[0053] like Figure 1 As shown, optionally, the solar absorption cooling unit 10 includes a steam generator 11, a condenser 12 and an absorber 13. The steam outlet of the steam generator 11 is connected to the steam inlet of the condenser 12. The condenser 12 is connected to the first evaporator 21 through a fourth throttle valve 16. The first evaporator 21 is connected to the absorber 13. The absorber 13 is connected to the solution heat exchanger 15 through a solution pump 14. The solution heat exchanger 15 is connected to the steam generator 11.

[0054] Steam can be generated by using the heat energy converted from absorbed solar energy in the steam generator 11. After the steam is condensed in the condenser 12, it is absorbed and evaporated in the first evaporator 21 and absorbed in the absorber 13. It is then replenished to the steam generator 11 by the solution pump 14.

[0055] Specifically, the solar absorption cooling unit 10 includes a solar absorption circuit, which comprises a solar flat plate collector 18 and a hot water pump 19. During periods when solar energy can be utilized, water flows through the solar flat plate collector 18 to absorb the heat generated by solar energy. After absorbing heat, the water flows into the portion of the solar absorption circuit located in the steam generator 11, releasing heat to the solution in the steam generator 11, thereby causing partial evaporation of the solvent in the solution within the steam generator 11. The water that has released heat is then pumped back into the solar flat plate collector 18 by the hot water pump 19 to continue absorbing heat.

[0056] A fourth throttling valve 16 is provided between the condenser 12 and the first evaporator 21. When the vapor generated by solvent evaporation enters the condenser 12 and condenses into a liquid state, releasing heat, it is then throttled and depressurized by the fourth throttling valve 16 before entering the evaporator and evaporating into a gaseous state. This vapor then enters the absorber 13, reducing the concentration within the absorber 13. After the solution concentration in the absorber 13 decreases, it is pumped by the solution pump 14 to the solution heat exchanger 15 to absorb heat, and then sent to the steam generator 11 to absorb solar energy again and evaporate into steam.

[0057] like Figure 1 As shown, optionally, the solution heat exchanger 15 has a concentrated solution side and a dilute solution side. One end of the dilute solution side is connected to the outlet of the solution pump 14, and the other end of the dilute solution side is connected to the steam generator 11. One end of the concentrated solution side is connected to the steam generator 11, and the other end of the concentrated solution side is connected to the absorber 13 through the fifth throttle valve 17.

[0058] This configuration utilizes the characteristic that the concentrated solution in the steam generator 11 has absorbed the heat energy converted from solar energy and its temperature has increased. Part of the heat from the concentrated solution is transferred to the dilute solution about to enter the steam generator 11 via the solution heat exchanger 15, thereby increasing the temperature of the dilute solution. This makes it easier for the dilute solution to evaporate and form steam after entering the steam generator 11. Furthermore, the fifth throttle valve 17 can control the speed at which the concentrated solution enters the absorber 13 from the solution heat exchanger 15, thus controlling the rate at which heat is supplied to the dilute solution.

[0059] Specifically, in this embodiment, the cold-side inlet of the solution heat exchanger 15 is the inlet of the dilute solution entering the solution heat exchanger 15, while the cold-side outlet is connected to the steam generator 11, meaning the cold side of the solution heat exchanger 15 is the dilute solution side. The hot-side inlet of the solution heat exchanger 15 is connected to the steam generator 11 to allow the concentrated solution to enter, while the hot-side outlet is connected to the absorber 13 to allow the concentrated solution to flow out of the solution heat exchanger 15 and into the absorber 13, meaning the hot side of the solution heat exchanger 15 is the concentrated solution side.

[0060] like Figure 1As shown, optionally, the intermediate cooling unit 20 includes a water heat exchanger 22 and a water pump 23. The water heat exchanger 22, the water-cooled condenser 32, the water pump 23 and the first evaporator 21 are connected in series to form a circulation loop.

[0061] By installing a cold water pump 23 in the intermediate cooling unit 20, the working fluid in the intermediate cooling unit 20 can be driven by the cold water pump 23 to flow in the water-cooled condenser 32, the first evaporator 21 and the cold water heat exchanger 22, thereby rapidly supplying the cold water that has released heat through the first evaporator 21 to the cold water heat exchanger 22 to cool the room.

[0062] The operating principle of this embodiment is as follows: The composite refrigeration device provided in this embodiment can be divided into three different working modes based on whether the solar energy is sufficient. The specific criteria for dividing each mode, such as the solar energy intensity, can be set by those skilled in the art as needed, and this application does not make any specific limitations.

[0063] Mode 1: such as Figure 2 As shown, when solar energy is abundant, the solar absorption refrigeration unit 10, the intermediate refrigeration unit, and the compression refrigeration unit 30 all operate. At this time, the air-cooled condenser 34 stops operating, and the second throttle valve 36 is closed. The solar flat plate collector 18 absorbs the light energy generated by the sun, causing the water temperature inside it to rise. The high-temperature hot water enters the pipes in the solar heat absorption circuit within the steam generator 11, transferring heat to the solution inside the steam generator 11, thus raising the temperature of the dilute solution inside the steam generator 11 and generating water vapor. The dilute solution can be a lithium bromide aqueous solution. After the lithium bromide aqueous solution is heated by the water in the solar heat absorption circuit, the solvent—water—evaporates as water vapor, increasing the concentration of the solution in the steam generator 11, changing it from a dilute solution to a concentrated solution.

[0064] Water vapor condenses into liquid water on the refrigerant water side of condenser 12. After being throttled and depressurized by the fourth throttle valve 16, it enters the first evaporator 21. The liquid water evaporates into gas in the first evaporator 21 and then enters the absorber 13. Simultaneously, the dilute solution in steam generator 11 becomes a concentrated solution due to the reduction in solvent mass after the evaporation of water vapor. The concentrated solution from steam generator 11 passes sequentially through the concentrated solution side of solution heat exchanger 15 and the fifth throttle valve 17 into absorber 13. The concentrated solution in absorber 13 becomes dilute after absorbing the water vapor discharged from the evaporator. The dilute solution then passes sequentially through solution pump 14 and the dilute solution side of solution heat exchanger back to steam generator 11, completing the solar energy absorption refrigeration cycle.

[0065] The chilled water in the first evaporator 21 first enters the low-temperature side of the cold water heat exchanger 22, where it absorbs heat from the high-temperature side cold water, causing its temperature to rise. The high-temperature side cold water originates from the user end. After absorbing heat in the cold water heat exchanger 22, the chilled water enters the water-cooled condenser 32 to absorb the heat released by the condensation of the gaseous refrigerant in the compression refrigeration unit 30, further increasing its temperature. Finally, it is pressurized by the cold water pump 23 and returned to the cold water side of the first evaporator 21, lowering its temperature and completing the intermediate cooling cycle.

[0066] The high-temperature, high-pressure gaseous refrigerant discharged from compressor 31 enters water-cooled condenser 32, releasing heat to the chilled water circulating in intermediate cooling unit 20. The high-temperature, high-pressure gaseous refrigerant condenses into high-pressure liquid refrigerant, which then enters economizer 37 through first throttle valve 35. In economizer 37, part of the liquid refrigerant is depressurized and evaporated into medium-pressure gas, then enters the medium-temperature gas inlet of compressor 31; the other part of the liquid refrigerant is throttled a second time through third throttle valve 38 and enters second evaporator 33, where it absorbs heat and evaporates into low-temperature, low-pressure gas, returning to the inlet of compressor 31 to complete the water source compression cycle.

[0067] Mode 2: such as Figure 3 As shown, when solar energy is insufficient, the chilled water produced by the solar energy absorption cooling unit 10 cannot fully bear the sensible heat load of the building, or the cooling capacity of the water source compression refrigeration cycle cannot fully bear the latent heat load of the building's air conditioning. Therefore, the air source compression refrigeration function of the compression refrigeration unit 30 is activated to bear part of the load. The solar energy absorption cooling unit 10, the intermediate cooling unit 20, and the compression refrigeration unit 30 are in operation.

[0068] In Mode 2, the operation of the solar absorption refrigeration unit 10 and the intermediate cooling unit 20 is the same as in Mode 1, and will not be repeated here. However, due to insufficient solar energy, the amount of water vapor generated in the steam generator 11 is reduced, and the amount of heat absorbed by the water vapor from the intermediate cooling unit 20 in the first evaporator 21 is reduced. Compared with Mode 1, this results in an increase in the temperature of the chilled water entering the cold water heat exchanger 22 and the water-cooled condenser 32. This leads to insufficient cooling capacity generated by the chilled water in the intermediate cooling unit 20 in the water-cooled condenser 32, or the chilled water cannot completely remove the heat released by the refrigerant condensation in the water-cooled condenser 32.

[0069] Therefore, in Mode 2, the high-temperature, high-pressure gaseous refrigerant discharged from compressor 31 is divided into two paths. One path enters water-cooled condenser 32, releases heat to the chilled water in intermediate cooling unit 20, and condenses into high-pressure liquid refrigerant. The high-pressure liquid refrigerant then enters economizer 37 through first throttle valve 35. The other path enters air-cooled condenser 34, condenses into high-pressure liquid refrigerant, and then enters economizer 37 after being throttled and depressurized by second throttle valve 36. In economizer 37, part of the liquid refrigerant is depressurized and evaporated into medium-pressure gas, which then enters the medium-temperature gas inlet of compressor 31. The other part of the liquid refrigerant is throttled twice by third throttle valve 38 and enters second evaporator 33, where it absorbs heat and evaporates into low-temperature, low-pressure gas, returning to the intake end of compressor 31, completing the water source compression cycle and air source compression refrigeration cycle.

[0070] Mode 3: such as Figure 4 As shown, when no solar energy is available, only the air-source compression refrigeration unit 30 operates, while the solar energy absorption refrigeration unit 10, the intermediate cooling unit 20, and the water-source compression refrigeration cycle of the compression refrigeration unit 30 cease operation. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor 31 enters the air-cooled condenser 34 and condenses into high-pressure liquid refrigerant. After being throttled and depressurized by the second throttling valve 36, it enters the economizer 37. In the economizer 37, part of the liquid refrigerant is depressurized and evaporated into a medium-pressure gaseous state, then enters the medium-temperature gas inlet of the compressor 31; the other part of the liquid refrigerant is throttled a second time by the third throttling valve 38 and enters the second evaporator 33. In the second evaporator 33, it absorbs heat and evaporates into a low-temperature, low-pressure gas, returning to the inlet of the compressor 31, completing the water-source compression cycle and the air-source compression refrigeration cycle.

[0071] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

[0072] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variations thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0073] In the above embodiments, descriptions of directions such as "up" and "down" are based on the accompanying drawings.

[0074] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0075] Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A composite refrigeration device, characterized in that, The system includes a solar absorption cooling unit (10), an intermediate cooling unit (20), and a compression cooling unit (30). The solar absorption cooling unit (10) includes a first evaporator (21), which is connected to the circuit of the intermediate cooling unit (20). The compression cooling unit (30) includes a compressor (31) and a water-cooled condenser (32), which is connected to the outlet end of the compressor (31) and is connected to the circuit of the intermediate cooling unit (20).

2. The composite refrigeration device according to claim 1, characterized in that, The compression refrigeration unit (30) further includes a second evaporator (33), which is connected to the inlet end of the compressor (31) and is configured to supply cooling to the room.

3. The composite refrigeration device according to claim 2, characterized in that, The compression refrigeration unit (30) also includes an air-cooled condenser (34), which is connected to the outlet end of the compressor (31) and in parallel with the water-cooled condenser (32).

4. The composite refrigeration device according to claim 3, characterized in that, The outlet end of the water-cooled condenser (32) is connected to a first throttle valve (35); the outlet end of the air-cooled condenser (34) is connected to a second throttle valve (36); the outlet end of the first throttle valve (35) is connected to the outlet end of the second throttle valve (36).

5. The composite refrigeration device according to claim 2, characterized in that, The compression refrigeration unit (30) also includes an economizer (37), which is connected between the second evaporator (33) and the water-cooled condenser (32). The economizer (37) has a gaseous refrigerant outlet and a liquid refrigerant outlet. The gaseous refrigerant outlet is connected to the medium-temperature gas inlet of the compressor (31), and the liquid refrigerant outlet is connected to the refrigerant inlet of the second evaporator (33).

6. The composite refrigeration device according to claim 3, characterized in that, The compression refrigeration unit (30) also includes an economizer (37), which is connected between the second evaporator (33) and the air-cooled condenser (34). The economizer (37) has a gaseous refrigerant outlet and a liquid refrigerant outlet. The gaseous refrigerant outlet is connected to the medium-temperature gas inlet of the compressor (31), and the liquid refrigerant outlet is connected to the refrigerant inlet of the second evaporator (33).

7. The composite refrigeration device according to claim 5 or 6, characterized in that, The liquid refrigerant outlet is connected to the refrigerant inlet of the second evaporator (33) via a third throttle valve (38).

8. The composite refrigeration device according to any one of claims 1-6, characterized in that, The solar absorption refrigeration unit (10) includes a steam generator (11), a condenser (12) and an absorber (13). The steam outlet of the steam generator (11) is connected to the steam inlet of the condenser (12). The condenser (12) is connected to the first evaporator (21) through a fourth throttle valve (16). The first evaporator (21) is connected to the absorber (13). The absorber (13) is connected to the solution heat exchanger (15) through a solution pump (14). The solution heat exchanger (15) is connected to the steam generator (11).

9. The composite refrigeration device according to claim 8, characterized in that, The solution heat exchanger (15) has a concentrated solution side and a dilute solution side. One end of the dilute solution side is connected to the outlet of the solution pump (14), and the other end of the dilute solution side is connected to the steam generator (11). One end of the concentrated solution side is connected to the steam generator (11), and the other end of the concentrated solution side is connected to the absorber (13) through the fifth throttle valve (17).

10. The composite refrigeration device according to any one of claims 1-6, characterized in that, The intermediate cooling unit (20) includes a cold water heat exchanger (22) and a cold water pump (23). The cold water heat exchanger (22), the water-cooled condenser (32), the cold water pump (23) and the first evaporator (21) are connected in series to form a circulation loop.

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