Refrigeration system
By introducing additional throttling devices and valve components into the refrigeration system, the heat exchange process is controlled according to the temperature difference, the problem of low energy efficiency when the compressor is low, and the high COP performance is improved under low load is achieved.
Patent Information
- Application Number
- CN202421985192.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-15
AI Technical Summary
The existing refrigeration system has low energy efficiency performance when the compressor load is low, and the setting of the economizer improves the COP performance at high loads and does not improve at low loads.
The additional throttling device and valve assembly are adopted to adjust the opening and closing of the additional throttling device, the first valve and the second valve according to the temperature difference between the refrigerant and the heat source fluid, so as to realize the first temperature difference working condition and the second temperature difference working condition of the refrigeration system, and optimize the heat exchange process.
High COP performance can still be achieved when the compressor load is less than 50%. The liquid refrigerant is cooled by the heat source liquid to improve the refrigeration capacity without increasing the compressor power consumption.
Smart Images
Figure CN223050247U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of refrigeration systems. Background Art
[0002] In the prior art, a refrigeration system includes a compressor, a first heat exchanger, and a condenser. The first heat exchanger is configured to exchange heat between the refrigerant flowing out of the condenser and the refrigerant after additional throttling. The start and stop of the first heat exchanger are determined by the load of the compressor. When the compressor load is small, the first heat exchanger is turned off, and the energy efficiency performance of the refrigeration system is low. Summary of the Utility Model
[0003] Exemplary embodiments of this application can solve at least some of the above problems.
[0004] This application provides a refrigeration system, including a compressor, a condenser, a throttling device, and an additional throttling device. The refrigeration system further includes a first heat exchanger. The first heat exchanger includes a first heat exchange channel, a second heat exchange channel, and a third heat exchange channel. The first heat exchange channel is capable of exchanging heat with the second heat exchange channel, and the second heat exchange channel is capable of exchanging heat with the third heat exchange channel. Wherein, the additional throttling device is connected to the condenser outlet of the condenser. The first heat exchange channel is connected between the additional throttling device and the compressor, so that the refrigerant leaving the additional throttling device can enter the compressor after passing through the first heat exchange channel. Wherein, the second heat exchange channel is connected between the condenser and the throttling device, so that the refrigerant leaving the condenser can enter the throttling device after passing through the second heat exchange channel. The refrigeration system further includes a heat source inlet pipe and a heat source outlet pipe. The third heat exchange channel is connected between the heat source inlet pipe and the heat source outlet pipe, so that the heat source fluid can flow into the third heat exchange channel.
[0005] According to the above refrigeration system, the refrigeration system further includes a second heat exchanger. The second heat exchanger includes an additional first heat exchange channel and an additional second heat exchange channel. The additional first heat exchange channel is capable of exchanging heat with the additional second heat exchange channel. The additional first heat exchange channel is connected between the third heat exchange channel and the heat source outlet pipe through a heat exchanger connection pipe. The additional second heat exchange channel is connected between the compressor and the condenser, so that the refrigerant leaving the compressor can enter the condenser after passing through the additional second heat exchange channel.
[0006] According to the above refrigeration system, the refrigeration system further includes a heat source bypass pipe. One end of the heat source bypass pipe is connected to the heat exchanger connection pipe, and the other end of the heat source bypass pipe is connected to the heat source inlet pipe.
[0007] According to the above refrigeration system, the additional throttling device is configured to be able to open or close, so as to control whether the refrigerant leaving the condenser enters the first heat exchange channel. The refrigeration system further includes a valve assembly, and the valve assembly is configured to be able to control whether the heat source fluid flows through the third heat exchange channel after entering the refrigeration system from the heat source introduction pipe.
[0008] According to the above refrigeration system, the valve assembly further includes a first valve and a second valve. The first valve is configured to be able to open or close and is arranged on the heat source introduction pipe, so as to control whether the heat source fluid enters the third heat exchange channel. The second valve is configured to be able to open or close and is arranged on the heat source bypass pipe, so as to control whether the heat source fluid enters the additional first heat exchange channel.
[0009] According to the above refrigeration system, the refrigeration system further includes a control device, and the control device is configured to be communicatively connected to the additional throttling device, the first valve and the second valve, so as to control the opening and closing of the additional throttling device, the first valve and the second valve.
[0010] According to the above refrigeration system, the control device is configured to control the additional throttling device, the first valve and the second valve according to the temperature difference between the refrigerant and the heat source fluid.
[0011] According to the above refrigeration system, the control device is configured to control the additional throttling device, the first valve and the second valve according to the temperature difference between the refrigerant leaving the condenser and the heat source fluid in the heat source introduction pipe.
[0012] According to the above refrigeration system, the refrigeration system has a first temperature difference condition and a second temperature difference condition. When the refrigeration system is in the first temperature difference condition, the control device closes the additional throttling device and the second valve, and opens the first valve, so that the refrigerant in the second heat exchange channel exchanges heat with the heat source fluid in the third heat exchange channel, and the heat source fluid in the additional first heat exchange channel exchanges heat with the refrigerant in the additional second heat exchange channel. When the refrigeration system is in the second temperature difference condition, the control device opens the additional throttling device and the second valve, and closes the first valve, so that the refrigerant in the first heat exchange channel exchanges heat with the refrigerant in the second heat exchange channel.
[0013] According to the above refrigeration system, when the temperature difference between the liquid refrigerant and the heat source fluid is greater than or equal to a preset temperature, the refrigeration system is in the first temperature difference condition. When the temperature difference between the liquid refrigerant and the heat source fluid is less than the preset temperature, the refrigeration system is in the second temperature difference condition.
[0014] According to the above refrigeration system, the preset temperature is 8°C.
[0015] The refrigeration system of the present application can also achieve a high COP performance when the current load of the compressor is less than 50%. Specifically, when the refrigeration system is in the first temperature difference condition, in the first heat exchanger, the heat source liquid cools the liquid refrigerant, thereby improving the refrigeration capacity of the refrigeration system. Since no refrigerant enters the compressor through the compressor gas make-up port, the power consumption of the compressor does not increase. Even when the current load of the compressor is less than 50%, the refrigeration system can cool the liquid refrigerant, thereby improving the COP performance of the refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] The features and advantages of the present application can be better understood by referring to the following detailed description read in conjunction with the accompanying drawings. Throughout the drawings, like reference numerals represent like components, where:
[0017] Figure 1 is a system schematic diagram of the refrigeration system of the present application;
[0018] Figure 2 is Figure 1 a control system diagram of the refrigeration system shown;
[0019] Figure 3A is Figure 1 a system schematic diagram of the refrigeration system shown in the first temperature difference condition;
[0020] Figure 3B is Figure 1 a system schematic diagram of the refrigeration system shown in the second temperature difference condition. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] Various specific embodiments of the present invention will be described below with reference to the drawings that form a part of this specification. It should be understood that although directional terms such as "front", "rear", "upper", "lower", "left", "right", etc. are used in the present invention to describe various example structural parts and elements of the present invention, these terms are used herein only for the purpose of convenience of description and are determined based on the example orientations shown in the drawings. Since the embodiments disclosed in the present invention can be arranged in different directions, these directional terms are used only as illustrations and should not be regarded as limitations. In the following drawings, the same reference numerals are used for the same components.
[0022] Figure 1 is a system schematic diagram of the refrigeration system of the present application. As Figure 1As shown, the refrigeration system includes a compressor 102, an evaporator 104, a condenser 106, a first heat exchanger 108, a second heat exchanger 110, a throttling device 112, and an additional throttling device 114. The compressor 102 has a compressor outlet 1021, a compressor inlet 1022, and a compressor gas injection port 1023. The evaporator 104 has an evaporator inlet 1041 and an evaporator outlet 1042. The condenser 106 has a condenser inlet 1061 and a condenser outlet 1062. The first heat exchanger 108 includes independent first, second, and third heat exchange channels 1081, 1082, and 1083. The first heat exchange channel 1081 can exchange heat with the second heat exchange channel 1082, and the second heat exchange channel 1082 can exchange heat with the third heat exchange channel 1083. The second heat exchanger 110 includes an additional first heat exchange channel 1101 and an additional second heat exchange channel 1102. The additional first heat exchange channel 1101 can exchange heat with the additional second heat exchange channel 1102.
[0023] As Figure 1 shown, the compressor outlet 1021 is connected to the first port 1111 of the additional second heat exchange channel 1102 through a pipe 401. The second port 1112 of the additional second heat exchange channel 1102 is connected to the condenser inlet 1061 through a pipe 402. Thus, the refrigerant leaving the compressor 102 can enter the condenser 106 after passing through the additional second heat exchange channel 1102. The condenser outlet 1062 is connected to the first port 1091 of the second heat exchange channel 1082 through a pipe 403. The second port 1092 of the second heat exchange channel 1082 is connected to the evaporator inlet 1041 through a pipe 404. The throttling device 112 is disposed on the pipe 404, so that the refrigerant flowing out of the second heat exchange channel 1082 can enter the evaporator 104 after passing through the throttling device 112. The evaporator outlet 1042 is connected to the compressor inlet 1022 through a pipe 405.
[0024] As Figure 1 shown, the first port 1093 of the first heat exchange channel 1081 is connected to the compressor gas injection port 1023 through a pipe 406. The second port 1094 of the first heat exchange channel 1081 is connected to the condenser outlet 1062 through a pipe 407. Specifically, one end of the pipe 407 is connected to the pipe 403, and the other end of the pipe 407 is connected to the second port 1094 of the first heat exchange channel 1081. The additional throttling device 114 is disposed on the pipe 407, so that the refrigerant flowing out of the condenser outlet 1062 can enter the first heat exchange channel 1081 after passing through the additional throttling device 114 and then enter the compressor 102. In addition, the additional throttling device 114 is configured to be able to be opened or closed, so as to control whether the refrigerant leaving the condenser 106 enters the first heat exchange channel 1081.
[0025] As Figure 1As shown, the refrigeration system further includes a heat exchanger connecting pipe 122, a heat source introducing pipe 123, and a heat source leading-out pipe 125. The heat source introducing pipe 123 is connected to the first port 1095 of the third heat exchange channel 1083. One end of the heat exchanger connecting pipe 122 is connected to the second port 1096 of the third heat exchange channel 1083, and the other end of the heat exchanger connecting pipe 122 is connected to the first port 1161 of the additional first heat exchange channel 1101. The heat source leading-out pipe 125 is connected to the second port 1162 of the additional first heat exchange channel 1101. Thus, after the heat source fluid enters the refrigeration system through the heat source introducing pipe 123, it can sequentially pass through the third heat exchange channel 1083 and the additional first heat exchange channel 1101, and flow out of the refrigeration system through the heat source leading-out pipe 125.
[0026] In addition, as Figure 1 shown, the refrigeration system further includes a heat source bypass pipe 124. One end of the heat source bypass pipe 124 is connected to the heat exchanger connecting pipe 122, and the other end of the heat source bypass pipe 124 is connected to the heat source introducing pipe 123 at the connection point A. Therefore, after the heat source fluid enters the refrigeration system through the heat source introducing pipe 123, it can pass through the heat source bypass pipe 124 and the additional first heat exchange channel 1101, and flow out of the refrigeration system through the heat source leading-out pipe 125.
[0027] As Figure 1 shown, the refrigeration system further includes a first valve 131 and a second valve 132. The first valve 131 is disposed on the heat source introducing pipe 123 and is disposed between the connection point A and the first port 1095 of the third heat exchange channel 1083. The first valve 131 is configured to be able to open or close, so as to control whether the heat source fluid enters the third heat exchange channel 1083. The second valve 132 is disposed on the heat source bypass pipe 124. The second valve 132 is configured to be able to open or close, so as to control whether the heat source fluid enters the additional first heat exchange channel 1101.
[0028] It can be understood that although the first valve 131 and the second valve 132 are shown in the present application, those skilled in the art can understand that in other embodiments, the present application may include a valve assembly configured to be able to control whether the heat source fluid flows through the third heat exchange channel 1083 after entering the refrigeration system from the heat source introducing pipe 123. The valve assembly may include various valves such as a switching valve and a three-way valve.
[0029] Figure 2 is Figure 1 the control system diagram of the refrigeration system shown. As Figure 2As shown, the refrigeration system further includes a control device 202. The control device 202 is configured to communicate with the additional throttling device 114, the first valve 131, and the second valve 132, so as to control the opening and closing of the additional throttling device 114, the first valve 131, and the second valve 132. The control device 202 is configured to control the additional throttling device 114, the first valve 131, and the second valve 132 according to the temperature difference between the refrigerant and the heat source fluid. In an embodiment of the present application, the control device 202 is configured to control the additional throttling device 114, the first valve 131, and the second valve 132 according to the temperature difference between the refrigerant leaving the condenser 106 and the heat source fluid in the heat source inlet pipe 123.
[0030] As Figure 2 shown, the refrigeration system further includes a first detection device 211 and a second detection device 212. The first detection device 211 is configured to detect the temperature of the refrigerant leaving the condenser 106, so as to detect the temperature of the liquid refrigerant. The second detection device 212 is configured to detect the temperature of the heat source fluid in the heat source inlet pipe 123. As an embodiment, the first detection device 211 is disposed on the pipeline 403. The second detection device 212 is disposed on the heat source inlet pipe 123. The first detection device 211 and the second detection device 212 are respectively communicatively connected to the control device 202, so as to send the temperature of the refrigerant leaving the condenser 106 and the temperature of the heat source fluid in the heat source inlet pipe 123 to the control device 202.
[0031] The refrigeration system of the present application has a first temperature difference condition and a second temperature difference condition. In the present application, when the temperature difference between the liquid refrigerant and the heat source fluid is greater than or equal to a preset temperature, the refrigeration system is in the first temperature difference condition. When the temperature difference between the liquid refrigerant and the heat source fluid is less than the preset temperature, the refrigeration system is in the second temperature difference condition. As an example, the preset temperature in the present application is 8°C.
[0032] Next, the states of the additional throttling device 114, the first valve 131, and the second valve 132 of the refrigeration system when the refrigeration system is in the first temperature difference condition and the second temperature difference condition respectively will be described Figure 3A - Figure 3B together with the flow direction of the refrigerant.
[0033] Figure 3A is Figure 1 a schematic diagram of the refrigeration system in the first temperature difference condition as shown. As Figure 3A shown, when the refrigeration system is in the first temperature difference condition, the control device 202 closes the additional throttling device 114 and the second valve 132, and opens the first valve 131, so that the refrigerant in the second heat exchange channel 1082 exchanges heat with the heat source fluid in the third heat exchange channel, and the heat source fluid in the additional first heat exchange channel 1101 exchanges heat with the refrigerant in the additional second heat exchange channel 1102.
[0034] As Figure 3A shown, the refrigerant is compressed into a high-temperature and high-pressure refrigerant in the compressor 102. The high-temperature and high-pressure refrigerant (i.e., gaseous refrigerant) flowing out of the compressor outlet 1021 flows through the pipeline 401, the additional second heat exchange channel 1102 of the second heat exchanger 110, and the pipeline 402 and then enters the condenser 106. In the condenser 106, the high-temperature and high-pressure refrigerant exchanges heat with the fluid at a lower temperature on the air side, and thus becomes a high-temperature and high-pressure refrigerant (i.e., liquid refrigerant). The high-temperature and high-pressure refrigerant flows through the pipeline 403 and the second heat exchange channel 1082 of the first heat exchanger 108 and then flows to the throttling device 112. After flowing through the throttling device 112, the high-temperature and high-pressure refrigerant becomes a low-temperature and low-pressure refrigerant, and then flows into the evaporator 104. In the evaporator 104, the low-temperature and low-pressure refrigerant exchanges heat with the fluid at a higher temperature on the user side, thereby reducing the temperature of the fluid on the user side to provide a fluid at a lower temperature for the user (for example, for providing chilled water for air conditioning). The low-temperature and low-pressure refrigerant becomes a low-temperature and low-pressure gaseous refrigerant after exchanging heat with the fluid on the user side in the evaporator 104. The low-temperature and low-pressure gaseous refrigerant enters the compressor 102 again through the pipeline 405. Thus, the refrigeration cycle is completed.
[0035] In addition, the heat source fluid flows through the heat source inlet pipe 123 and the first valve 131 and enters the third heat exchange channel 1083 of the first heat exchanger 108. In the first heat exchanger 108, the heat source fluid exchanges heat with the refrigerant, so that the temperature of the refrigerant is lower before entering the throttling device 112. The temperature of the heat source fluid increases after exchanging heat with the refrigerant, and continues to flow through the heat exchanger connecting pipe 122 and enters the additional first heat exchange channel 1101 of the second heat exchanger 110. In the second heat exchanger 110, the heat source fluid exchanges heat with the refrigerant, so that the temperature of the refrigerant is lower before entering the condenser 106. The temperature of the heat source fluid increases after exchanging heat with the refrigerant, and flows out through the heat source outlet pipe 125.
[0036] When the refrigeration system is in the first temperature difference working condition, in the first heat exchanger 108, the heat source liquid cools the liquid refrigerant, thereby improving the refrigeration capacity of the refrigeration system. Since no refrigerant enters the compressor 102 through the compressor gas replenishment port 1023, the power consumption of the compressor does not increase. Therefore, when the refrigeration system is in the first temperature difference working condition, the COP performance of the refrigeration system is improved. As an example, the COP performance of the refrigeration system is improved by 5.6%.
[0037] Figure 3B is Figure 1 the system schematic diagram of the refrigeration system in the second temperature difference working condition as shown. As Figure 3BAs shown, when the refrigeration system is in the second temperature difference operating condition, the control device 202 opens the additional throttling device 114 and the second valve 132, and closes the first valve 131, so that the refrigerant in the first heat exchange channel 1081 exchanges heat with the refrigerant in the second heat exchange channel 1082, and the heat source fluid in the additional first heat exchange channel 1101 exchanges heat with the refrigerant in the additional second heat exchange channel 1102.
[0038] As Figure 3B shown, the refrigerant is compressed into a high-temperature and high-pressure refrigerant in the compressor 102. The high-temperature and high-pressure refrigerant flowing out of the compressor outlet 1021 (i.e., gaseous refrigerant) flows through the pipeline 401, the additional second heat exchange channel 1102 of the second heat exchanger 110, and the pipeline 402 and then enters the condenser 106. In the condenser 106, the high-temperature and high-pressure refrigerant exchanges heat with the fluid with a lower temperature on the air side, and thus becomes a high-temperature and high-pressure refrigerant (i.e., liquid refrigerant). The high-temperature and high-pressure refrigerant is divided into two streams after entering the pipeline 403. One stream of refrigerant enters the second heat exchange channel 1082 through the first port 1091 of the second heat exchange channel 1082, and flows out to the throttling device 112 after passing through the second port 1092 of the second heat exchange channel 1082. The high-temperature and high-pressure refrigerant becomes a low-temperature and low-pressure refrigerant after flowing through the throttling device 112, and then flows into the evaporator 104. In the evaporator 104, the low-temperature and low-pressure refrigerant exchanges heat with the fluid with a higher temperature on the user side, thereby reducing the temperature of the user-side fluid to provide a fluid with a lower temperature for the user (for example, for providing chilled water for air conditioning). The low-temperature and low-pressure refrigerant becomes a low-temperature and low-pressure gaseous refrigerant after exchanging heat with the user-side fluid in the evaporator 104. The low-temperature and low-pressure gaseous refrigerant enters the compressor 102 again through the pipeline 405. Thus, the refrigeration cycle is completed. At the same time, the other stream of high-temperature and high-pressure refrigerant after entering the pipeline 403 flows through the additional throttling device 114 through the pipeline 407. The pressure of the high-temperature and high-pressure refrigerant decreases when flowing through the additional throttling device 114. Subsequently, it enters the first heat exchange channel 1081 through the second port 1094 of the first heat exchange channel 1081. In the first heat exchanger 108, the refrigerant leaving the condenser 106 exchanges heat with the refrigerant leaving the additional throttling device 114. Subsequently, the refrigerant flows out through the first port 1093 of the first heat exchange channel 1081, and enters the compressor 102 through the pipeline 406 and the compressor gas supplement port 1023.
[0039] In addition, the heat source fluid flows through the heat source inlet pipe 123 and the second valve 132 and enters the additional first heat exchange channel 1101 of the second heat exchanger 110. In the second heat exchanger 110, the heat source fluid exchanges heat with the refrigerant, so that the temperature of the refrigerant is lower before entering the condenser 106. The temperature of the heat source fluid increases after exchanging heat with the refrigerant, and flows out through the heat source outlet pipe 125.
[0040] When the refrigeration system is in the second temperature difference condition, in the first heat exchanger 108, the refrigerant in the first heat exchange channel 1081 exchanges heat with the refrigerant in the second heat exchange channel 1082, so as to increase the refrigeration capacity of the refrigeration system by reducing the temperature of the refrigerant entering the evaporator 104. On the other hand, the refrigerant that has exchanged heat in the first heat exchanger 108 enters the compressor 102 through the pipeline 406, so that the exhaust temperature of the compressor 102 can be reduced.
[0041] The inventor of the present application found that in the prior art, the refrigeration system includes an economizer. However, the start of the economizer is usually related to the current load of the compressor. For example, when the current load of the compressor is lower than 50%, the economizer is turned off. When the current load of the compressor is higher than 50%, the economizer is turned on. However, while the economizer improves the refrigeration capacity of the refrigeration system, the power consumption of the compressor will also increase accordingly. That is to say, the setting of the economizer has little improvement on the COP performance of the refrigeration system under high load, and has no improvement effect on the refrigeration capacity and COP performance under low load.
[0042] The refrigeration system of the present application can also achieve a high COP performance when the current load of the compressor is lower than 50%. Specifically, when the refrigeration system is in the first temperature difference condition, in the first heat exchanger 108, the heat source liquid cools the liquid refrigerant, so as to improve the refrigeration capacity of the refrigeration system. Since no refrigerant enters the compressor 102 through the compressor gas injection port 1023, the power consumption of the compressor does not increase. Even when the current load of the compressor is lower than 50%, the refrigeration system can cool the liquid refrigerant, so as to improve the COP performance of the refrigeration system.
Claims
1. A refrigeration system, comprising a compressor (102), a condenser (106), a throttling device (112) and an additional throttling device (114), characterized in that: The refrigeration system further comprises: A first heat exchanger (108), the first heat exchanger (108) comprising a first heat exchange channel (1081), a second heat exchange channel (1082) and a third heat exchange channel (1083), the first heat exchange channel (1081) being capable of exchanging heat with the second heat exchange channel (1082), and the second heat exchange channel (1082) being capable of exchanging heat with the third heat exchange channel (1083); The additional throttling device (114) is connected to the condenser outlet (1062) of the condenser (106), and the first heat exchange channel (1081) is connected between the additional throttling device (114) and the compressor (102), so that the refrigerant leaving the additional throttling device (114) can enter the compressor (102) after passing through the first heat exchange channel (1081); The second heat exchange channel (1082) is connected between the condenser (106) and the throttling device (112), so that the refrigerant leaving the condenser (106) can enter the throttling device (112) after passing through the second heat exchange channel (1082); The refrigeration system further comprises a heat source inlet pipe (123) and a heat source outlet pipe (125), and the third heat exchange channel (1083) is connected between the heat source inlet pipe (123) and the heat source outlet pipe (125), so that the heat source fluid can flow into the third heat exchange channel (1083).
2. The refrigeration system according to claim 1, characterized in that: The refrigeration system further comprises: A second heat exchanger (110), the second heat exchanger (110) comprising an additional first heat exchange channel (1101) and an additional second heat exchange channel (1102), the additional first heat exchange channel (1101) being capable of exchanging heat with the additional second heat exchange channel (1102); The additional first heat exchange channel (1101) is connected between the third heat exchange channel (1083) and the heat source outlet pipe (125) via a heat exchanger connecting pipe (122), and the additional second heat exchange channel (1102) is connected between the compressor (102) and the condenser (106), so that the refrigerant leaving the compressor (102) can enter the condenser (106) after passing through the additional second heat exchange channel (1102).
3. The refrigeration system according to claim 2, characterized in that: The refrigeration system further comprises: A heat source bypass pipe (124), one end of the heat source bypass pipe (124) is connected to the heat exchanger connecting pipe (122), and the other end of the heat source bypass pipe (124) is connected to the heat source introduction pipe (123).
4. The refrigeration system according to claim 3, characterized in that: The additional throttling device (114) is configured to be able to be opened or closed, so as to control whether the refrigerant leaving the condenser (106) enters the first heat exchange channel (1081); The refrigeration system further comprises a valve assembly, wherein the valve assembly is configured to control whether the heat source fluid flows through the third heat exchange channel (1083) after entering the refrigeration system from the heat source introduction pipe (123).
5. The refrigeration system according to claim 4, characterized in that: The valve assembly comprises: a first valve (131), the first valve (131) being configured to be able to be opened or closed and being disposed on the heat source introduction pipe (123), so as to control whether the heat source fluid enters the third heat exchange channel (1083); and A second valve (132), the second valve (132) is configured to be able to be opened or closed, and is disposed on the heat source bypass pipe (124), so as to control whether the heat source fluid enters the additional first heat exchange channel (1101).
6. The refrigeration system according to claim 5, characterized in that: The refrigeration system further comprises: A control device (202), wherein the control device (202) is configured to communicate with the additional throttling device (114), the first valve (131) and the second valve (132), so as to control the opening and closing of the additional throttling device (114), the first valve (131) and the second valve (132).
7. The refrigeration system according to claim 6, characterized in that: The control device (202) is configured to control the additional throttling device (114), the first valve (131) and the second valve (132) according to the temperature difference between the refrigerant and the heat source fluid.
8. The refrigeration system according to claim 7, characterized in that: The control device (202) is configured to control the additional throttling device (114), the first valve (131) and the second valve (132) according to the temperature difference between the refrigerant leaving the condenser (106) and the heat source fluid in the heat source introduction pipe (123).
9. The refrigeration system according to claim 6, characterized in that: The refrigeration system has a first temperature difference working condition and a second temperature difference working condition; When the refrigeration system is in a first temperature difference operating condition, the control device (202) closes the additional throttling device (114) and the second valve (132), and opens the first valve (131), so that the refrigerant in the second heat exchange channel (1082) exchanges heat with the heat source fluid in the third heat exchange channel (1083), and the heat source fluid in the additional first heat exchange channel (1101) exchanges heat with the refrigerant in the additional second heat exchange channel (1102); When the refrigeration system is in a second temperature difference operating condition, the control device (202) opens the additional throttling device (114) and the second valve (132), and closes the first valve (131), thereby allowing the refrigerant in the first heat exchange channel (1081) to exchange heat with the refrigerant in the second heat exchange channel (1082).
10. The refrigeration system according to claim 9, characterized in that: When the temperature difference between the liquid refrigerant and the heat source fluid is greater than or equal to a preset temperature, the refrigeration system is in a first temperature difference operating condition; When the temperature difference between the liquid refrigerant and the heat source fluid is less than a preset temperature, the refrigeration system is in a second temperature difference operating condition.
11. The refrigeration system according to claim 10, characterized in that: The preset temperature is 8°C.