A combined compression and absorption cycle refrigeration device

Abstract

The present invention provides a combined compression and absorption cycle refrigeration device, which includes a compressor and a generator. The compressor is connected to a high-temperature condenser, and the high-temperature condenser is located inside the generator. The high-temperature condenser is connected to a low-temperature heat exchanger, the low-temperature heat exchanger is connected to a primary throttle valve, and the primary throttle valve is connected to a primary evaporator. The generator is connected to a solution heat exchanger, the solution heat exchanger is connected to an absorber, the absorber is connected to a secondary evaporator, the secondary evaporator is connected to a secondary throttle valve, the secondary throttle valve is connected to a secondary condenser, and the secondary condenser is connected to the generator. By embedding the high-temperature condenser of compression refrigeration into the generator of absorption refrigeration, the present invention fully utilizes the heat discharged by the compressed refrigerant to drive absorption refrigeration, enabling the two major refrigeration cycles to operate jointly. Thereby, the refrigeration energy efficiency is greatly improved, the refrigeration heat emission is reduced, the energy consumption and operation cost are lowered, and green refrigeration is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration, and particularly to a combined compression and absorption cycle refrigeration device. Background Art

[0002] With the rapid development of China's economy, the living standards of the people have been continuously improved, and the energy consumption has increased sharply. At present, the total energy consumption in China has ranked second in the world. Air-conditioning refrigeration technology is widely used in national production and life, and refrigeration energy consumption accounts for a part of China's total energy consumption. How to improve the efficiency of the refrigeration system and reduce refrigeration energy consumption is the focus of refrigeration technology research. At present, the two major mainstream refrigeration technologies in the refrigeration industry are vapor compression refrigeration and absorption refrigeration. Vapor compression refrigeration units are widely used because of their small volume, stable operation, and high refrigeration efficiency. However, the operation of compression refrigeration mainly relies on electricity, resulting in high power consumption. Absorption refrigeration operation mainly relies on heat, and the power consumption is very low. However, absorption refrigeration units are large in volume and complex in operation. In particular, their refrigeration efficiency is significantly lower than that of refrigeration units, resulting in their being only suitable for use when there is a waste heat source or in a situation of severe power shortage. Therefore, a device that combines the advantages of both is needed to reduce energy consumption while meeting the refrigeration demand. Summary of the Invention

[0003] The purpose of the present invention is to provide a combined compression and absorption cycle refrigeration device, which can use the heat discharged by the compressed refrigerant to drive absorption refrigeration, so that the two refrigeration cycles operate jointly. Thus, the refrigeration energy efficiency is greatly improved, the energy consumption and operation cost are reduced, and green refrigeration is realized.

[0004] The present invention provides a combined compression and absorption cycle refrigeration device, including a compressor and a generator. The compressor is connected to a high-temperature condenser, and the high-temperature condenser is located inside the generator. The high-temperature condenser is connected to a low-temperature heat exchanger, and the low-temperature heat exchanger is connected to a primary throttle valve. The primary throttle valve is connected to a primary evaporator, and a primary refrigerant pipe passes through the primary evaporator. The generator is connected to a solution heat exchanger, the solution heat exchanger is connected to an absorber, the absorber is connected to a secondary evaporator, a secondary refrigerant pipe passes through the secondary evaporator, the secondary evaporator is connected to a secondary throttle valve, the secondary throttle valve is connected to a secondary condenser, and the secondary condenser is connected to the generator.

[0005] Further, the lower end of the secondary evaporator is connected to the liquid inlet end of a secondary refrigerant pump, and the liquid outlet end of the secondary refrigerant pump is connected to a spray pipe at the upper end of the secondary evaporator.

[0006] Further, the upper end of the secondary evaporator is connected to the upper end of the absorber.

[0007] Further, the upper end of the secondary evaporator is connected to one end of the secondary throttle valve, and the other end of the secondary throttle valve is connected to the lower end of the secondary condenser.

[0008] Further, the lower end of the absorber is connected to the liquid inlet end of the second solution pump, and the liquid outlet end of the second solution pump is connected to the lower end of the solution heat exchanger.

[0009] Further, the lower end of the absorber is connected to the liquid inlet end of the first solution pump, the lower end of the solution heat exchanger is connected to the liquid inlet end of the first solution pump, and the liquid outlet end of the first solution pump is connected to the spray pipe at the upper end of the absorber.

[0010] Further, the upper end of the generator is connected to the first regulating valve, the first regulating valve is connected to the upper end of the solution heat exchanger, the lower end of the generator is connected to the second regulating valve, and the second regulating valve is connected to the upper end of the solution heat exchanger.

[0011] Further, the upper end of the low-temperature heat exchanger is connected to the first regulating valve, and the lower end of the low-temperature heat exchanger is connected to the liquid outlet end of the second solution pump.

[0012] Further, the lower end of the cooling tower is connected to the liquid inlet end of the cooling pump, the liquid outlet end of the cooling pump is connected to the cooling pipe, and the cooling pipe includes a first coil heat exchanger, a second coil heat exchanger and a water distribution pipe.

[0013] Further, the first coil heat exchanger is located inside the absorber, the second coil heat exchanger is located inside the secondary condenser, and the water distribution pipe is located inside the cooling tower.

[0014] The technical solution of the present invention embeds the high-temperature condenser of compression refrigeration into the generator of absorption refrigeration, and completely utilizes the heat discharged by the compression refrigerant to drive absorption refrigeration, so that the two refrigeration cycles operate jointly. Thereby, the refrigeration energy efficiency is greatly improved, the refrigeration heat emission is reduced, the energy consumption and operation cost are lowered, and green refrigeration is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 is the system schematic diagram of the present invention;

[0017] Figure 2 is the structural schematic diagram of the cooling pipe of the present invention;

[0018] Figure 3 This is the schematic diagram of the compression refrigeration system of the present invention;

[0019] Figure 4 This is the schematic diagram of the absorption refrigeration system of the present invention;

[0020] Description of the reference numerals: 1 - compressor, 2 - high-temperature condenser, 3 - low-temperature heat exchanger, 4 - primary throttle valve, 5 - evaporator, 6 - generator, 7 - first regulating valve, 8 - second regulating valve, 9 - solution heat exchanger, 10 - first solution pump, 11 - second solution pump, 12 - absorber, 13 - secondary refrigerant pump, 14 - cooling pump, 15 - secondary evaporator, 16 - secondary throttle valve, 17 - secondary condenser, 18 - cooling tower, 19 - cooling pipe, 191 - first coil heat exchanger, 192 - second coil heat exchanger, 193 - water distribution pipe, 20 - primary refrigerant pipe, 21 - secondary refrigerant pipe; Detailed implementation manners

[0021] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0023] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined. In addition, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Embodiment 1:

[0025] As Figures 1 - 4 shown:

[0026] A combined compression and absorption cycle refrigeration device, comprising two parts: compression refrigeration and absorption refrigeration:

[0027] Compression refrigeration:

[0028] It consists of equipment such as a compressor 1, a high-temperature condenser 2, a low-temperature heat exchanger 3, a primary throttle valve 4, an evaporator 5 and connecting pipes. The compressor 1 is connected to the high-temperature condenser 2. The high-temperature condenser 2 is located inside a generator 6. The high-temperature condenser 2 is connected to the low-temperature heat exchanger 3. The low-temperature heat exchanger 3 is connected to the primary throttle valve 4. The primary throttle valve 4 is connected to the primary evaporator 5. A primary refrigerant pipe 20 passes through the primary evaporator 5. The primary condenser is divided into two parts: the high-temperature condenser 2 and the low-temperature heat exchanger 3. The high-temperature condenser 2 is located inside the generator 6. The heat discharged by the compressed refrigerant is used to drive absorption refrigeration, enabling the two major refrigeration cycles to operate jointly. Thereby, the refrigeration energy efficiency is greatly improved, the energy consumption and operating costs are reduced, and green refrigeration is achieved.

[0029] The compression refrigeration described in this technical elaboration uses an R22 water-cooled screw compressor unit as the design prototype, but it does not affect the application of compression refrigeration units using other refrigerants in combined refrigeration. The refrigerants for compression refrigeration can be applicable to the entire range of refrigerants such as ammonia, carbon dioxide, and Freon.

[0030] Working principle:

[0031] The primary refrigerant absorbs the heat of the primary refrigerant medium in the primary evaporator 5 and evaporates into refrigerant vapor. The heat Qc1 absorbed in this process is the refrigerating capacity of compression refrigeration. The compressor 1 sucks in the refrigerant vapor and pressurizes it into high-temperature and high-pressure vapor. The power consumption of the compressor 1 is q, which is the electric power of the compressor 1. The coefficient of performance COP of primary compression refrigeration = Qc1:q. The high-pressure vapor releases heat in the primary condenser. The primary condenser is divided into a high-temperature condenser 2 and a low-temperature heat exchanger 3 according to high and low temperatures. The high-temperature condenser 2 is built into the generator 6 of the absorption refrigerator. The heat released by the refrigerant vapor in the high-temperature condensation section is used to heat the high-temperature solution of the absorbent in the generator 6. At the same time, the refrigerant temperature drops to about 80 °C and then enters the low-temperature heat exchanger 3. The refrigerant vapor exchanges heat with the low-temperature solution of the absorbent coming out of the absorber 12 in the low-temperature heat exchanger 3. Thus, it is finally cooled into a liquid refrigerant at about 40 °C. The total heat Q3 released by the refrigerant in the high- and low-temperature heat exchanger 3, in the simplified case without considering losses, Q3 = Qc1 + q. The liquid refrigerant is depressurized by the primary throttle valve 4 and then absorbs heat and evaporates again in the evaporator 5. Thus, a primary compression refrigeration cycle is formed.

[0032] Absorption refrigeration:

[0033] It mainly consists of equipment such as a secondary evaporator 15, an absorber 12, a generator 6, a low-temperature heat exchanger 3, a solution heat exchanger 9, a secondary condenser 17, a secondary throttle valve 16, a cooling tower 18, a cooling pump 14, a first solution pump 10, a second solution pump 11, a secondary refrigerant pump 13, a first regulating valve 7 and a second regulating valve 8, as well as connecting pipes. The generator 6 is connected to the solution heat exchanger 9, the solution heat exchanger 9 is connected to the absorber 12, the absorber 12 is connected to the secondary evaporator 15, the secondary refrigerant pipe 21 passes through the secondary evaporator 15, the secondary evaporator 15 is connected to the secondary throttle valve 16, the secondary throttle valve 16 is connected to the secondary condenser 17, and the secondary condenser 17 is connected to the cooling tower 18.

[0034] The lower end of the secondary evaporator 15 is connected to the liquid inlet end of the secondary refrigerant pump 13, and the liquid outlet end of the secondary refrigerant pump 13 is connected to the spray pipe of the secondary evaporator 15. The upper end of the secondary evaporator 15 is connected to the upper end of the absorber 12. The upper end of the secondary evaporator 15 is connected to one end of the secondary throttle valve 16, and the other end of the secondary throttle valve 16 is connected to the lower end of the secondary condenser 17.

[0035] The lower end of the absorber 12 is connected to the liquid inlet end of the second solution pump 11, and the liquid outlet end of the second solution pump 11 is connected to the lower end of the solution heat exchanger 9. The lower end of the absorber 12 is connected to the liquid inlet end of the first solution pump 10, the lower end of the solution heat exchanger 9 is connected to the liquid inlet end of the first solution pump 10, and the liquid outlet end of the first solution pump 10 is connected to the spray pipe of the absorber 12. The upper end of the generator 6 is connected to the first regulating valve 7, the first regulating valve 7 is connected to the upper end of the solution heat exchanger 9, the lower end of the generator 6 is connected to the second regulating valve 8, and the second regulating valve 8 is connected to the upper end of the solution heat exchanger 9. The upper end of the low-temperature heat exchanger 3 is connected to the first regulating valve 7, and the lower end of the low-temperature heat exchanger 3 is connected to the liquid outlet end of the second solution pump 11.

[0036] The lower end of the cooling tower 18 is connected to the liquid inlet end of the cooling pump 14, the liquid outlet end of the cooling pump 14 is connected to the cooling pipe 19, and the cooling pipe 19 includes a first coil heat exchanger 191, a second coil heat exchanger 192 and a water distribution pipe 193. The first coil heat exchanger 191 is located inside the absorber 12, the second coil heat exchanger 192 is located inside the secondary condenser 17, and the water distribution pipe 193 is located inside the cooling tower 18.

[0037] Absorption refrigeration forms a working pair with a refrigerant and an absorbent, and through heating and cooling, the refrigerant forms a gas-liquid cycle, thereby achieving refrigeration. In the combined refrigeration process, absorption refrigeration can apply all absorption refrigeration working pairs. The secondary absorption refrigeration described in this technology uses a single-effect lithium bromide refrigeration unit as a prototype, but it does not affect the application of absorption refrigeration units using other working pairs in the combined refrigeration process.

[0038] Working principle:

[0039] The secondary refrigerant absorbs the heat of the secondary chilled water in the secondary evaporator 15 and evaporates. The heat Qc2 absorbed in this process is the refrigerating capacity of the secondary refrigeration. In the absorber 12, the secondary refrigerant vapor is absorbed by the absorbent solution, and the heat of vaporization is taken away by the cooling water in the first coil heat exchanger 191. The solution pump pressurizes the absorbent solution and divides it into two streams. One stream passes through the low-temperature heat exchanger 3 to absorb the heat of the primary refrigerant, and the other stream passes through the solution heat exchanger 9 to absorb the heat of the high-temperature absorbent solution. Finally, it flows into the generator 6 through the regulating valve. In the solution heat exchanger 9, the concentrated solution and the dilute solution conduct heat exchange, so that the temperature of the absorbent solution flowing into the absorber 12 decreases, and the temperature of the absorbent solution flowing into the generator 6 increases. The absorbent solution in the generator 6 is heated to boiling by the built-in high-temperature condenser 2 to generate secondary refrigerant vapor. The heat Q3 released by the primary refrigerant in the high-temperature condenser 2 and the low-temperature heat exchanger 3 is the heat source driving the secondary absorption refrigeration cycle, and COP = Qc2:Q3. In the secondary condenser 17, the secondary refrigerant is cooled by the cooling water in the second coil heat exchanger 192 and condensed into a low-temperature liquid refrigerant. The heat Qp taken away by the cooling water is the discharge heat of the cooling tower 18. In absorption refrigeration, the motor power of the auxiliary unit is small. When simplifying the calculation, Qp = Q3 + Qc2. The low-temperature refrigerant water is depressurized by the secondary throttle valve 16 and then absorbs heat and evaporates again in the secondary evaporator 15 to form a complete absorption refrigeration cycle.

[0040] Derivation and analysis of the performance coefficient of the present invention:

[0041] Compression refrigeration units are widely used. According to GB / T19577-2015, the COP of large water-cooled refrigeration units is much higher than that of small air-cooled refrigeration units. This is because the condensation temperature of the condenser in the water-cooling system is about 40 °C or even lower, which is conducive to the heat dissipation of the refrigerant. In the combined refrigeration process, the heat discharged by the primary compressed refrigerant in the condenser is not directly taken away by the cooling water, but is used to heat the absorbent solution in the absorption refrigeration unit. The condenser of the primary compression refrigeration is divided into two sections. Among them, the condensation temperature of the high-temperature condenser 2 is about 80 °C, and the condensation temperature of the final low-temperature heat exchanger 3 is about 40 °C, which is consistent with the water-cooled refrigeration cycle. Therefore, the performance coefficient COP of the primary compression refrigeration in the combined refrigeration cycle is selected with reference to the COP of the water-cooled compression refrigerator of 4.2-8.1. At present, the COP of the water-cooled screw compressor 1 is about 5.5, and the COP of the centrifugal compressor will be higher. Therefore, in this derivation, the performance coefficient COP of the primary compression refrigeration is 5.5, the power of the primary compression refrigeration compressor 1 is q, the refrigerating capacity Qc1 = 5.5*q, and the heat discharged by the primary compression refrigeration Q3 = Qc1 + q = 6.5q.

[0042] Secondary absorption refrigeration uses a refrigerant and an absorbent to form a working pair. By enhancing heating and cooling, the refrigerant completes the gas-liquid cycle, thereby achieving refrigeration. Different working pairs and different generation temperatures in the generator 6 all affect the coefficient of performance (COP) of the absorption refrigeration cycle. The exhaust temperature after compression of most primary refrigerants meets the generation temperature requirements of the generator 6 in a lithium bromide absorption refrigeration unit. Therefore, for the COP of the combined refrigeration secondary absorption refrigeration, it is selected with reference to the COP of lithium bromide absorption units on the market. (According to GB / T18362-2008, the COP of a lithium bromide absorption refrigeration unit ≥ 1.10). In the derivation of the COP this time, the COP of secondary absorption refrigeration is 1.1. Since secondary absorption refrigeration fully utilizes the heat Q3 discharged from primary compression refrigeration as the driving heat source, therefore, the cooling capacity Qc2 of secondary absorption refrigeration = 1.1 * Q3 = 7.15q, and the heat Qp discharged by the cooling tower 18 = Q3 + Qc2 = 13.65q.

[0043] The total cooling capacity Qc of the combined refrigeration = Qc1 + Qc2 = 12.65q, the total input power is q, the total heat discharged is 13.65q, and the total COP = 12.65. The energy efficiency of the combined refrigeration is much higher than that of using compression refrigeration alone or absorption refrigeration alone, playing a very good role in energy conservation, emission reduction, and reduction of energy consumption, and greatly improving the energy efficiency ratio of the refrigeration system.

[0044] Example 2:

[0045] As Figures 1 - 4 shown:

[0046] The difference between this example and Example 1 is that the compressor 1 of the compression refrigeration is a large water-cooled centrifugal compressor, and the COP of the large water-cooled centrifugal compressor can reach 8. The absorption refrigeration uses the same unit as that used in Example 1, and the COP of the combined refrigeration increases to 17.9.

[0047] Others are the same as those described in Example 1 and will not be elaborated again.

[0048] The present invention does not change the refrigeration cycles of compression refrigeration and absorption refrigeration respectively, so it is technically mature and reliable. By setting up the high-temperature condenser 2 and the low-temperature heat exchanger 3, the present invention not only ensures that all the heat discharged by the primary refrigerant is utilized by the secondary absorption refrigeration, but also meets the need for heat dissipation and condensation of the primary refrigerant. The heat discharged during the compression refrigeration process is effectively utilized to drive the operation of the absorption refrigeration unit. Therefore, how to ensure that the heat discharged during the compression refrigeration process is effectively and efficiently utilized by the absorption refrigeration to achieve the derived COP value is the key to the implementation of the present invention. The ideal state of the present invention is that the saturation temperature after the compression of the primary refrigerant is greater than or equal to the generation temperature of the secondary absorption refrigeration. In this way, the main heat of the primary refrigerant in the high-temperature state heats the high-temperature absorbent solution in the generator in the high-temperature condenser 2. Then, a small amount of heat in the low-temperature state exchanges heat with the low-temperature dilute absorbent solution coming out of the absorber in the low-temperature heat exchanger to complete the entire condensation process. If the pressures of the absorption refrigeration generator 6 and the secondary condenser 17 are simply adjusted, it is also possible to make the saturation temperature after the compression of the primary refrigerant greater than or equal to the generation temperature of the secondary absorption refrigeration. However, the reduction of the generation temperature will reduce the efficiency of the secondary absorption refrigeration, thus reducing the overall COP value of the combined refrigeration. As long as the relationship among the exhaust temperature, saturation temperature after the compression of the primary refrigerant, generation temperature and absorption temperature of the secondary absorption refrigeration is considered, and the primary refrigerant, compression form, working pair of the secondary absorption refrigeration and absorption refrigeration form are comprehensively matched, and the high-temperature condenser 2 and the low-temperature heat exchanger 3 are reasonably set, it is completely possible to make the COP of the combined refrigeration greater than 15, or even close to 20.

[0049] The technical solution of the present invention embeds the high-temperature condenser 2 of the compression refrigeration into the generator 6 of the absorption refrigeration, and completely utilizes the heat discharged by the compressed refrigerant to drive the absorption refrigeration, so that the two major refrigeration cycles operate jointly. Thus, the refrigeration energy efficiency is greatly improved, the refrigeration heat emission is reduced, the energy consumption and operation cost are lowered, and green refrigeration is achieved.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A combined compression and absorption cycle refrigeration device, characterized in that Comprising: A compressor and a generator, the compressor is connected to a high-temperature condenser, the high-temperature condenser is located inside the generator, the high-temperature condenser is connected to a low-temperature heat exchanger, the low-temperature heat exchanger is connected to a primary throttle valve, the primary throttle valve is connected to a primary evaporator, and a primary refrigerant pipe passes through the primary evaporator; the generator is connected to a solution heat exchanger, the solution heat exchanger is connected to an absorber, the absorber is connected to a secondary evaporator, a secondary refrigerant pipe passes through the secondary evaporator, the secondary evaporator is connected to a secondary throttle valve, the secondary throttle valve is connected to a secondary condenser, and the secondary condenser is connected to the generator; The lower end of the secondary evaporator is connected to the liquid inlet end of a secondary refrigerant pump, and the liquid outlet end of the secondary refrigerant pump is connected to a spray pipe at the upper end of the secondary evaporator; The upper end of the secondary evaporator is connected to the upper end of the absorber; The upper end of the secondary evaporator is connected to one end of a secondary throttle valve, and the other end of the secondary throttle valve is connected to the lower end of the secondary condenser; The lower end of the absorber is connected to the liquid inlet end of a second solution pump, and the liquid outlet end of the second solution pump is connected to the lower end of the solution heat exchanger; The lower end of the absorber is connected to the liquid inlet end of a first solution pump, the lower end of the solution heat exchanger is connected to the liquid inlet end of the first solution pump, and the liquid outlet end of the first solution pump is connected to a spray pipe at the upper end of the absorber; The upper end of the generator is connected to a first regulating valve, the first regulating valve is connected to the upper end of the solution heat exchanger, the lower end of the generator is connected to a second regulating valve, and the second regulating valve is connected to the upper end of the solution heat exchanger; The upper end of the low-temperature heat exchanger is connected to the first regulating valve, and the lower end of the low-temperature heat exchanger is connected to the liquid outlet end of the second solution pump; The saturated temperature after the compression of the primary refrigerant is greater than or equal to the generation temperature of the secondary absorption refrigeration, so that most of the heat in the high-temperature state of the primary refrigerant is used to heat the high-temperature absorbent solution in the generator in the high-temperature condenser, and then a small part of the heat in the low-temperature state is used to exchange heat with the low-temperature absorbent dilute solution coming out of the absorber in the low-temperature heat exchanger to complete the entire condensation process.

2. The combined compression and absorption cycle refrigeration device according to claim 1, wherein The secondary condenser is connected to a cooling tower, the lower end of the cooling tower is connected to the liquid inlet end of a cooling pump, the liquid outlet end of the cooling pump is connected to a cooling pipe, and the cooling pipe includes a first coil heat exchanger, a second coil heat exchanger and a water distribution pipe.

3. A compression and absorption combined cycle refrigeration device according to claim 2, characterized in that, The first coil heat exchanger is located inside the absorber, the second coil heat exchanger is located inside the secondary condenser, and the water distribution pipe is located inside the cooling tower.

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