A summer indoor radiation cooling system and control method thereof

Abstract

The present invention provides a summer indoor radiation cooling system and a control method thereof, comprising a heat exchange device and a radiation refrigeration device, wherein the heat exchange device comprises a first compressor, a gas-liquid separator, a four-way valve, a fin heat exchanger, a first expansion valve, a filter, a liquid storage device, a sleeve heat exchanger and a shell-and-tube heat exchanger; the radiation refrigeration device comprises a ceiling radiation panel and a wall radiation panel, wherein the ceiling radiation panel and the wall radiation panel are connected in parallel between the shell inlet and outlet of the shell-and-tube heat exchanger; the fresh air device comprises a fresh air precooling device, a fresh air dehumidification device, a fresh air reheating device, a wet film humidification device and an air supply device, wherein the air outlet of the fresh air precooling device is sequentially connected with the fresh air dehumidification device, the fresh air reheating device, the wet film humidification device and the air supply device. The present invention can realize the multifunctional cooling of the unit and the room humidity requirements through different control logic modes according to the different temperature and humidity differences in the use places.

Description

Technical Field

[0001] The invention relates to a cooling system, in particular to a summer indoor radiation cooling system and a control method thereof. Background Art

[0002] With the development of my country's economy and technology, the demand and consumption of energy have gradually increased. Studies have found that the construction field is one of the important subjects of energy consumption. In the building energy consumption, the proportion of cooling and heating systems and domestic hot water systems is close to 60%. With the improvement of people's living standards, the energy consumption of building cooling and heating systems will continue to rise, and it is particularly important to achieve its high efficiency and energy saving. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a summer indoor radiant cooling system and a control method thereof, with high utilization rate of waste cold recovery, and the combined operation of radiant cooling and fresh air dehumidification effectively preventing condensation problems in radiant cooling.

[0004] To solve the above technical problems, an embodiment of the present invention provides a summer indoor radiant cooling system, comprising a heat exchange device and a radiant refrigeration device, wherein the heat exchange device comprises a first compressor, a gas-liquid separator, a four-way valve, a fin heat exchanger, a first expansion valve, a filter, a liquid reservoir, a sleeve heat exchanger and a shell-and-tube heat exchanger, wherein the high-temperature refrigerant outlet of the first compressor is connected to the tube-side inlet of the shell-and-tube heat exchanger through the four-way valve, the tube-side outlet of the shell-and-tube heat exchanger is connected to the inlet of the liquid reservoir, the outlet of the liquid reservoir is connected to the fin heat exchanger through the first expansion valve and the filter, and the low-temperature refrigerant outlet of the fin heat exchanger is connected to the reflux port of the first compressor through the four-way valve and the gas-liquid separator in turn; the sleeve heat exchanger is connected in parallel to the pipeline between the shell-and-tube heat exchanger and the liquid reservoir;

[0005] The radiation refrigeration device comprises a ceiling radiation panel and a wall radiation panel, and the ceiling radiation panel and the wall radiation panel are connected in parallel between the water inlet and the water outlet of the shell side of the shell and tube heat exchanger.

[0006] Among them, the summer indoor radiant cooling system also includes a fresh air device, which includes a fresh air pre-cooling device, a fresh air dehumidification device, a fresh air reheating device, a wet film humidification device and an air supply device, and the air outlet of the fresh air pre-cooling device is connected to the fresh air dehumidification device, the fresh air reheating device, the wet film humidification device and the air supply device in sequence.

[0007] The ceiling radiation panels and the wall radiation panels are respectively connected to the water inlet and outlet of the shell side of the shell and tube heat exchanger through their own manifolds.

[0008] Wherein, the water inlet and outlet of the shell-and-tube heat exchanger are connected to the water supply device through a water supply pipe and a water return pipe respectively.

[0009] Furthermore, the fresh air device also includes a second compressor and a second expansion valve, and the second compressor, the fresh air reheating device, the second expansion valve and the fresh air dehumidification device are cyclically connected.

[0010] Preferably, the fresh air reheating device uses a fin reheater, the fresh air dehumidification device uses a fin evaporator, the fresh air precooling device uses a fin precooler, and the wet film humidification device uses a wet film humidifier.

[0011] The present invention also provides a control method for a summer indoor radiation cooling system, when the outdoor ambient temperature T0>30°C, the summer ceiling radiation and wall radiation cooling modes are turned on, comprising the following steps:

[0012] (1) The high-temperature refrigerant discharged from the first compressor enters the finned heat exchanger through the four-way valve for heat exchange, and then is throttled and decompressed by the first expansion valve. Then, it flows into the shell-and-tube heat exchanger through the filter and the liquid reservoir for primary heat exchange, and then enters the tube side of the shell-and-tube heat exchanger, exchanges heat with the water to be cooled in the shell side of the shell-and-tube heat exchanger to generate 18°C ​​high-temperature cold water, which enters the ceiling radiation panel and the wall radiation panel through the pipeline for cooling;

[0013] (2) The refrigerant in the tube side of the shell and tube heat exchanger flows through the four-way valve and the gas-liquid separator and then returns to the first compressor;

[0014] (3) Cyclic refrigeration based on steps (1) and (2).

[0015] Wherein, step (1) comprises the following specific steps:

[0016] (1-1) When the outdoor ambient temperature T0>30℃ and the relative humidity>60%, the summer ceiling radiation and wall radiation cooling mode and the fresh air treatment mode are turned on, including the following steps:

[0017] (1-1-1) Residual cooling recovery process: The high-temperature refrigerant vapor discharged from the first compressor exchanges heat with the finned heat exchanger through the four-way valve, is throttled and depressurized by the first expansion valve, and then flows through the filter and the liquid storage device in sequence. It then exchanges primary heat with the shell-and-tube heat exchanger to produce cold water for precooling the fresh air in the fresh air precooling device.

[0018] (1-1-2) The refrigerant flowing out of the shell-and-tube heat exchanger enters the tube side of the shell-and-tube heat exchanger, exchanges heat with the water to be cooled in the shell side of the shell-and-tube heat exchanger to produce 18°C ​​high-temperature cold water, which passes through the pipes and enters the ceiling radiation panels and wall radiation panels for cooling;

[0019] (1-1-3) The fresh air precooled in the fresh air precooling device is dehumidified by the fresh air dehumidification device, reheated by the fresh air reheating device, and humidified by the wet film humidification device, and then blown into the room by the air supply device;

[0020] (1-2) When the outdoor ambient temperature T0>30℃ and the relative humidity <40%, the summer ceiling radiation and wall radiation cooling mode, as well as the fresh air air conditioning cooling mode are turned on, including the following steps:

[0021] (1-2-1) The high-temperature refrigerant vapor discharged from the first compressor exchanges heat with the finned heat exchanger through the four-way valve, is throttled and depressurized by the first expansion valve, and then flows through the filter and the liquid storage tank in sequence, and then exchanges heat with the water to be cooled in the shell side of the shell and tube heat exchanger to produce 18°C ​​high-temperature cold water, which enters the ceiling radiation panel and the wall radiation panel through the pipeline for cooling;

[0022] (1-2-2) Fresh air air conditioning: The fresh air precooled in the fresh air precooling device is dehumidified by the fresh air dehumidification device, reheated by the fresh air reheating device, humidified by the wet film humidification device, and then blown into the room by the air supply device;

[0023] The fresh air entering the fresh air dehumidification device is pre-cooled by refrigerant circulation: the high-temperature refrigerant vapor discharged from the second compressor flows through the shell-and-tube heat exchanger for heat exchange, is throttled and reduced in pressure by the second expansion valve, exchanges heat with the fresh air in the fresh air dehumidification device, and then flows back to the second compressor, thus achieving refrigerant circulation cooling.

[0024] The beneficial effects of the above technical solution of the present invention are as follows:

[0025] 1. The present invention can realize the multifunctional cooling of the unit and the room humidity requirements by changing different control logic modes according to the different humidity differences in the use places.

[0026] 2. The traditional cooling system uses cold water with a water temperature of 7°C. The cold water in the summer indoor radiant cooling system provided by the present invention is 18°C ​​high-temperature cold water, which greatly reduces energy consumption and waste. At the same time, radiant cooling has no blowing feeling, meeting people's living comfort requirements.

[0027] 3. The present invention innovatively proposes to recover the waste cooling of the air source heat pump for treating the humidity of the fresh air and is equipped with a complete set of fresh air treatment modes to solve the problem of easy condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is the system principle diagram of the present invention;

[0029] Figure 2 for Figure 1 Enlarged view of the heat exchange device in the middle;

[0030] Figure 3 for Figure 1 A magnified view of the radiation cooling device;

[0031] Figure 4 for Figure 1 A magnified view of the fresh air device in the middle;

[0032] Figure 5 It is a control flow chart of the combination of the dual cooling mode and the fresh air processing mode in the present invention;

[0033] Figure 6 It is a control flow chart of the combination of the dual cooling mode and the fresh air air conditioning mode in the present invention.

[0034] Description of reference numerals:

[0035] 1-1, first compressor; 1-2, gas-liquid separator; 1-3, four-way valve; 1-4, finned heat exchanger; 1-5, first expansion valve; 1-6, filter; 1-7, liquid storage tank; 1-8, shell-and-tube heat exchanger; 1-9, shell-and-tube heat exchanger; 1-10, wall radiation panel; 1-11, ceiling radiation panel;

[0036] 2-1, second compressor; 2-2, second expansion valve; 2-3, fresh air reheating device; 2-4, fresh air dehumidification device; 2-5, fresh air precooling device; 2-6, wet film humidification device; 2-7, air supply device;

[0037] 1, No. 1 solenoid valve; 2, No. 2 solenoid valve; 3, No. 3 solenoid valve; 4, No. 4 solenoid valve; 5, No. 5 solenoid valve; 6, No. 6 solenoid valve; 7, No. 7 solenoid valve; 8, No. 8 solenoid valve; 9, No. 9 solenoid valve; 10, No. 10 solenoid valve; 11, No. 11 solenoid valve; 12, No. 12 solenoid valve; 13, No. 13 solenoid valve; 14, No. 14 solenoid valve; 15, No. 15 solenoid valve; 18, No. 18 solenoid valve; 19, No. 19 solenoid valve; 20, No. 20 solenoid valve. DETAILED DESCRIPTION

[0038] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1-Figure 4As shown, the present invention provides a summer indoor radiation cooling system, including a heat exchange device and a radiation refrigeration device, the heat exchange device includes a first compressor 1-1, a gas-liquid separator 1-2, a four-way valve 1-3, a finned heat exchanger 1-4, a first expansion valve 1-5, a filter 1-6, a liquid storage device 1-7, a shell-and-tube heat exchanger 1-8 and a shell-and-tube heat exchanger 1-9, the high-temperature refrigerant outlet of the first compressor 1-1 is connected to the tube side inlet of the shell-and-tube heat exchanger 1-9 through the four-way valve 1-3. The tube-type heat exchanger 1-9 is connected to the inlet of the liquid storage device 1-7, the outlet of the liquid storage device 1-7 is connected to the finned heat exchanger 1-4 through the first expansion valve 1-5 and the filter 1-6, and the low-temperature refrigerant outlet of the finned heat exchanger 1-4 is connected to the return port of the first compressor 1-1 through the four-way valve 1-3 and the gas-liquid separator 1-2 in turn; the shell-and-tube heat exchanger 1-8 is connected in parallel to the pipeline between the shell-and-tube heat exchanger 1-9 and the liquid storage device 1-7. The water inlet and outlet of the shell-and-tube heat exchanger 1-8 are connected to the water supply device through the water supply pipe and the return pipe respectively.

[0040] The radiation cooling device includes a ceiling radiation panel 1-11 and a wall radiation panel 1-10, and the ceiling radiation panel 1-11 and the wall radiation panel 1-10 are connected in parallel between the shell side water inlet and outlet of the shell and tube heat exchanger 1-9. Preferably, the ceiling radiation panel 1-11 and the wall radiation panel 1-10 are connected to the shell side water inlet and outlet of the shell and tube heat exchanger 1-9 through their own manifolds.

[0041] The summer indoor radiant cooling system also includes a fresh air device, which includes a fresh air pre-cooling device 2-5, a fresh air dehumidification device 2-4, a fresh air reheating device 2-3, a wet film humidification device 2-6 and an air supply device 2-7, and the air outlet of the fresh air pre-cooling device 2-5 is connected to the fresh air dehumidification device 2-4, the fresh air reheating device 2-3, the wet film humidification device 2-6 and the air supply device 2-7 in sequence.

[0042] The fresh air device also includes a second compressor 2-1 and a second expansion valve 2-2. The second compressor 2-1, the fresh air reheating device 2-3, the second expansion valve 2-2 and the fresh air dehumidification device 2-4 are cyclically connected.

[0043] Preferably, the fresh air reheating device 2-3 uses a fin reheater, the fresh air dehumidification device 2-4 uses a fin evaporator, the fresh air precooling device 2-5 uses a fin precooler, and the wet film humidification device 2-6 uses a wet film humidifier.

[0044] In the present invention, a No. 20 solenoid valve 20 is provided on the pipeline between the shell and tube heat exchanger 1-9 and the liquid reservoir 1-7, a No. 2 solenoid valve 2 is provided on the pipeline between the front side of the No. 20 solenoid valve 20 and the shell and tube heat exchanger 1-8, and a No. 1 solenoid valve 1 is provided on the pipeline between the rear side of the No. 20 solenoid valve 20 and the shell and tube heat exchanger 1-8.

[0045] A No. 3 solenoid valve 3 is provided on the pipeline between the outlet of the shell-and-tube heat exchanger 1-8 and the inlet of the fresh air precooling device 2-5, and a No. 4 solenoid valve 4 is provided on the pipeline between the outlet of the fresh air precooling device 2-5 and the inlet of the shell-and-tube heat exchanger 1-8. A No. 18 solenoid valve 18 is provided on the return pipe of the shell-and-tube heat exchanger 1-8, and a No. 19 solenoid valve 19 is provided on the water supply pipe.

[0046] A No. 6 solenoid valve 6 is provided on the pipeline between the outlet of the second compressor 2-1 and the inlet of the fresh air reheat device 2-3, and a No. 5 solenoid valve 5 is provided on the pipeline between the front side of the No. 6 solenoid valve 6 and the inlet of the shell-and-tube heat exchanger 1-8. A No. 8 solenoid valve 8 is provided on the pipeline between the outlet of the fresh air reheat device 2-3 and the inlet of the fresh air dehumidification device 2-4, and a No. 7 solenoid valve 7 is provided on the pipeline between the front side of the No. 8 solenoid valve 8 and the outlet of the shell-and-tube heat exchanger 1-8.

[0047] A No. 9 solenoid valve 9 is provided on the water supply pipe of the wet film humidifying device 2 - 6 .

[0048] A solenoid valve No. 10 is provided on the outlet pipe of the shell and tube heat exchanger 1-9, and a solenoid valve No. 11 is provided on the return pipe. A solenoid valve No. 13 is provided on the pipeline between the front side of the solenoid valve No. 10 and the water inlet of the wall radiation panel 1-10, and a solenoid valve No. 12 is provided on the pipeline between the water outlet of the wall radiation panel 1-10 and the front side of the solenoid valve No. 11. A solenoid valve No. 15 is provided on the pipeline between the front side of the solenoid valve No. 10 and the water inlet of the ceiling radiation panel 1-11, and a solenoid valve No. 14 is provided on the pipeline between the water outlet of the ceiling radiation panel 1-11 and the front side of the solenoid valve No. 11.

[0049] The present invention also provides a control method for a summer indoor radiation cooling system, when the outdoor ambient temperature T0>30°C, the summer ceiling radiation and wall radiation cooling modes are turned on, comprising the following steps:

[0050] (1) The high-temperature refrigerant discharged from the first compressor 1-1 enters the finned heat exchanger 1-4 through the four-way valve 1-3 for heat exchange, and then passes through the first expansion valve 1-5 for throttling and pressure reduction, and then flows into the shell-and-tube heat exchanger 1-8 for primary heat exchange after passing through the filter 1-6 and the liquid storage tank 1-7, and then enters the tube side of the shell-and-tube heat exchanger 1-9, and after heat exchange with the water to be cooled in the shell side of the shell-and-tube heat exchanger 1-9, produces 18°C ​​high-temperature cold water, and enters the ceiling radiation panel 1-11 and the wall radiation panel 1-10 through the pipeline for cooling. It includes the following specific steps:

[0051] (1-1) When the outdoor ambient temperature T0>30℃ and the relative humidity>60%, turn on the summer ceiling radiation and wall radiation cooling mode, as well as the fresh air treatment mode. The steps are as follows:

[0052] (1-1-1) Residual cooling recovery process: The high-temperature refrigerant vapor discharged from the first compressor 1-1 exchanges heat with the finned heat exchanger 1-4 through the four-way valve 1-3, and then passes through the first expansion valve 1-5 for throttling and pressure reduction, and then flows through the filter 1-6 and the liquid storage 1-7 in sequence, and then exchanges primary heat with the shell-and-tube heat exchanger 1-8 to produce cold water for precooling the fresh air in the fresh air precooling device 2-5;

[0053] (1-1-2) The refrigerant flowing out of the shell-and-tube heat exchanger 1-8 enters the tube side of the shell-and-tube heat exchanger 1-9, exchanges heat with the water to be cooled in the shell side of the shell-and-tube heat exchanger 1-9 to generate 18°C ​​high-temperature cold water, which passes through the pipeline and enters the ceiling radiation panel 1-11 and the wall radiation panel 1-10 for cooling;

[0054] (1-1-3) The fresh air precooled in the fresh air precooling device 2-5 is dehumidified by the fresh air dehumidification device 2-4, reheated by the fresh air reheating device 2-3, humidified by the wet film humidification device 2-6, and then blown into the room by the air supply device 2-7. This step also includes a refrigerant circulation process provided by a refrigerant circulation device, which is formed by a fresh air dehumidification device 2-4, a second compressor 2-1, a fresh air reheating device 2-3 and a second expansion valve 2-2 connected in a loop.

[0055] The flow chart of the above control process is as follows: Figure 5 As shown, during the cooling process, solenoid valve No. 20 20, solenoid valve No. 5 5 and solenoid valve No. 7 7 are closed, and the rest are all opened.

[0056] (1-2) When the outdoor ambient temperature T0>30℃ and the relative humidity <40%, turn on the summer ceiling radiation and wall radiation cooling mode, as well as the fresh air air conditioning cooling mode. The steps are as follows:

[0057] (1-2-1) The high-temperature refrigerant vapor discharged from the first compressor 1-1 exchanges heat with the finned heat exchanger 1-4 through the four-way valve 1-3, and then passes through the first expansion valve 1-5 for throttling and pressure reduction, and then flows through the filter 1-6 and the liquid storage 1-7 in sequence, and then exchanges heat with the water to be cooled in the shell side of the shell and tube heat exchanger 1-9 to produce 18°C ​​high-temperature cold water, which enters the ceiling radiation panel 1-11 and the wall radiation panel 1-10 through the pipeline for cooling;

[0058] (1-2-2) Fresh air air conditioning refrigeration: The fresh air precooled in the fresh air precooling device 2-5 is dehumidified by the fresh air dehumidification device 2-4, reheated by the fresh air reheating device 2-3, humidified by the wet film humidification device 2-6, and then blown into the room by the air supply device 2-7;

[0059] The fresh air entering the fresh air dehumidification device 2-4 is pre-cooled by refrigerant circulation: the high-temperature refrigerant vapor discharged from the second compressor 2-1 flows through the shell-and-tube heat exchanger 1-8 for heat exchange, is throttled and reduced in pressure by the second expansion valve 2-2, exchanges heat with the fresh air in the fresh air dehumidification device 2-4, and then flows back to the second compressor 2-1, thus performing refrigerant circulation cooling.

[0060] (2) The refrigerant in the tube side of the shell and tube heat exchanger 1-9 flows through the four-way valve 1-3 and the gas-liquid separator 1-2 and then returns to the first compressor 1-1;

[0061] (3) Cyclic refrigeration based on steps (1) and (2).

[0062] The flow chart of the above control process is as follows: Figure 6 As shown, during the cooling process, solenoid valve No. 1 1, solenoid valve No. 2, solenoid valve No. 3, solenoid valve No. 4, solenoid valve No. 6 and solenoid valve No. 8 are closed, and the rest are all opened.

[0063] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A control method for an indoor radiant cooling system in summer, the control method using the following system: comprising a heat exchange device and a radiant cooling device, the heat exchange device comprising a first compressor (1-1), a gas-liquid separator (1-2), a four-way valve (1-3), a finned heat exchanger (1-4), a first expansion valve (1-5), a filter (1-6), a liquid storage device (1-7), a shell-and-tube heat exchanger (1-8) and a shell-and-tube heat exchanger (1-9), the high-temperature refrigerant outlet of the first compressor (1-1) being connected to the shell-and-tube heat exchanger (1-9) via the four-way valve (1-3). The tube-side inlet of the shell-and-tube heat exchanger (1-9) is connected, the tube-side outlet of the shell-and-tube heat exchanger (1-9) is connected to the inlet of the liquid accumulator (1-7), the outlet of the liquid accumulator (1-7) is connected to the finned heat exchanger (1-4) via the first expansion valve (1-5) and the filter (1-6), the low-temperature refrigerant outlet of the finned heat exchanger (1-4) is connected to the reflux port of the first compressor (1-1) via the four-way valve (1-3) and the gas-liquid separator (1-2) in sequence; the shell-and-tube heat exchanger (1-8) is connected in parallel to the pipeline between the shell-and-tube heat exchanger (1-9) and the liquid accumulator (1-7); The radiation refrigeration device comprises a ceiling radiation panel (1-11) and a wall radiation panel (1-10), wherein the ceiling radiation panel (1-11) and the wall radiation panel (1-10) are connected in parallel between the shell side water inlet and outlet of the shell and tube heat exchanger (1-9), and is characterized in that: When the outdoor ambient temperature T0>30℃, start the summer ceiling radiation and wall radiation cooling mode, including the following steps: S1: The high-temperature refrigerant discharged from the first compressor (1-1) passes through the four-way valve (1-3) into the finned heat exchanger (1-4) for heat exchange, and then passes through the first expansion valve (1-5) for throttling and pressure reduction, and then passes through the filter (1-6) and the liquid storage tank (1-7) and flows into the shell-and-tube heat exchanger (1-8) for primary heat exchange, and then enters the tube side of the shell-and-tube heat exchanger (1-9), exchanges heat with the water to be cooled in the shell side of the shell-and-tube heat exchanger (1-9) to generate 18°C ​​high-temperature cold water, and then passes through the pipeline into the ceiling radiation panel (1-11) and the wall radiation panel (1-10) for cooling; S2: The refrigerant in the tube side of the shell and tube heat exchanger (1-9) flows through the four-way valve (1-3) and the gas-liquid separator (1-2) and then returns to the first compressor (1-1); S3: Circulate refrigeration based on steps S1 and S2.

2. The control method of the indoor radiant cooling system in summer according to claim 1, characterized in that: The invention also comprises a fresh air device, wherein the fresh air device comprises a fresh air precooling device (2-5), a fresh air dehumidification device (2-4), a fresh air reheating device (2-3), a wet film humidification device (2-6) and an air supply device (2-7), and an air outlet of the fresh air precooling device (2-5) is connected to the fresh air dehumidification device (2-4), the fresh air reheating device (2-3), the wet film humidification device (2-6) and the air supply device (2-7) in sequence.

3. The control method of the indoor radiant cooling system in summer according to claim 1, characterized in that: The ceiling radiation panel (1-11) and the wall radiation panel (1-10) are respectively connected to the shell side water inlet and outlet of the shell and tube heat exchanger (1-9) through their own manifolds.

4. The control method of the indoor radiant cooling system in summer according to claim 1, characterized in that: The water inlet and outlet of the shell-and-tube heat exchanger (1-8) are connected to the water supply device through a water supply pipe and a water return pipe respectively.

5. The control method of the indoor radiant cooling system in summer according to claim 2, characterized in that: The fresh air device further comprises a second compressor (2-1) and a second expansion valve (2-2); the second compressor (2-1), the fresh air reheating device (2-3), the second expansion valve (2-2) and the fresh air dehumidification device (2-4) are cyclically connected.

6. The control method of the indoor radiant cooling system in summer according to claim 2, characterized in that: The fresh air reheating device (2-3) uses a fin reheater, the fresh air dehumidification device (2-4) uses a fin evaporator, the fresh air precooling device (2-5) uses a fin precooler, and the wet film humidification device (2-6) uses a wet film humidifier.

7. The control method of the indoor radiant cooling system in summer according to claim 1, characterized in that: Step S1 includes the following specific steps: S1-1: When the outdoor ambient temperature T0>30℃ and the relative humidity>60%, start the summer ceiling radiation and wall radiation cooling mode, as well as the fresh air processing mode, including the following steps: S1-1-1: Residual cooling recovery process: The high-temperature refrigerant vapor discharged from the first compressor (1-1) exchanges heat with the finned heat exchanger (1-4) through the four-way valve (1-3), is throttled and depressurized by the first expansion valve (1-5), and then flows through the filter (1-6) and the liquid storage tank (1-7) in sequence, and then exchanges primary heat with the shell-and-tube heat exchanger (1-8) to generate cold water for precooling the fresh air in the fresh air precooling device (2-5); S1-1-2: The refrigerant flowing out of the shell-and-tube heat exchanger (1-8) enters the tube side of the shell-and-tube heat exchanger (1-9), exchanges heat with the water to be cooled in the shell side of the shell-and-tube heat exchanger (1-9), and generates 18° C. high-temperature cold water, which enters the ceiling radiation panel (1-11) and the wall radiation panel (1-10) through the pipeline to provide cooling; S1-1-3: the fresh air precooled in the fresh air precooling device (2-5) is dehumidified by the fresh air dehumidification device (2-4), reheated by the fresh air reheating device (2-3), and humidified by the wet film humidification device (2-6), and then the fresh air is blown into the room by the air supply device (2-7); S1-2: When the outdoor ambient temperature T0>30℃ and the relative humidity <40%, start the summer ceiling radiation and wall radiation cooling mode, as well as the fresh air air conditioning cooling mode, including the following steps: S1-2-1: The high-temperature refrigerant vapor discharged from the first compressor (1-1) exchanges heat with the finned heat exchanger (1-4) through the four-way valve (1-3), and then passes through the first expansion valve (1-5) for throttling and pressure reduction, and then flows through the filter (1-6) and the liquid storage tank (1-7) in sequence, and then exchanges heat with the water to be cooled in the shell side of the shell and tube heat exchanger (1-9) to generate 18°C ​​high-temperature cold water, which enters the ceiling radiation panel (1-11) and the wall radiation panel (1-10) through the pipeline for cooling; S1-2-2: fresh air air conditioning refrigeration: the fresh air precooled in the fresh air precooling device (2-5) is dehumidified by the fresh air dehumidification device (2-4), reheated by the fresh air reheating device (2-3), humidified by the wet film humidification device (2-6), and then blown into the room by the air supply device (2-7); The fresh air entering the fresh air dehumidification device (2-4) is first subjected to refrigerant circulation refrigeration: the high-temperature refrigerant vapor discharged from the second compressor (2-1) flows through the shell-and-tube heat exchanger (1-8) for heat exchange, is throttled and reduced in pressure by the second expansion valve (2-2), exchanges heat with the fresh air in the fresh air dehumidification device (2-4), and then flows back to the second compressor (2-1), thereby performing refrigerant circulation refrigeration.

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