CN114754518A - Indoor radiation type cooling system in summer and control method thereof - Google Patents

Indoor radiation type cooling system in summer and control method thereof Download PDF

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Publication number
CN114754518A
CN114754518A CN202110032052.7A CN202110032052A CN114754518A CN 114754518 A CN114754518 A CN 114754518A CN 202110032052 A CN202110032052 A CN 202110032052A CN 114754518 A CN114754518 A CN 114754518A
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fresh air
heat exchanger
shell
radiation
compressor
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Inventor
王天舒
马晓洁
孙永剑
王颖
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Jiangsu Tianshu Electric Appliance Co Ltd
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Jiangsu Tianshu Electric Appliance Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/02—Heat pumps of the compression type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/65—Electronic processing for selecting an operating mode
    • F24F11/67—Switching between heating and cooling modes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
    • F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
    • F24F3/153—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification with subsequent heating, i.e. with the air, given the required humidity in the central station, passing a heating element to achieve the required temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/001—Compression cycle type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0089—Systems using radiation from walls or panels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/22—Means for preventing condensation or evacuating condensate
    • F24F2013/221—Means for preventing condensation or evacuating condensate to avoid the formation of condensate, e.g. dew
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/20—Humidity
    • F24F2110/22—Humidity of the outside air

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Thermal Sciences (AREA)
  • Central Air Conditioning (AREA)

Abstract

The invention provides an indoor radiation type cooling system in summer and a control method thereof, wherein the indoor radiation type cooling system comprises a heat exchange device and a radiation refrigerating device, wherein the heat exchange device comprises a first compressor, a gas-liquid separator, a four-way valve, a fin type heat exchanger, a first expansion valve, a filter, a liquid storage device, a sleeve type heat exchanger and a shell and tube type heat exchanger; the radiation refrigeration device comprises a ceiling radiation plate and a wall radiation plate, wherein the ceiling radiation plate and the wall radiation plate are connected in parallel between a shell pass water inlet and a shell pass water outlet of the shell-and-tube heat exchanger; the fresh air device comprises a fresh air precooling device, a fresh air dehumidifying device, a fresh air reheating device, a wet film humidifying device and an air supply device, and an air outlet of the fresh air precooling device is sequentially connected with the fresh air dehumidifying device, the fresh air reheating device, the wet film humidifying device and the air supply device. The invention can realize the multifunctional cooling of the unit and the room humidity requirement by different control logic modes aiming at different temperature and humidity differences of use places.

Description

Indoor radiation type cooling system in summer and control method thereof
Technical Field
The invention relates to a cooling system, in particular to a summer indoor radiation type cooling system and a control method thereof.
Background
Along with the development of economic technology in China, the demand and the consumption of energy are gradually increased, researches find that the building field is one of important main bodies of energy consumption, in the building energy consumption, the proportion of a cooling and heating system and a domestic hot water system is close to 60%, along with the improvement of the living standard of people, the energy consumption of the building cooling and heating system is in a continuous rising trend, and the realization of high efficiency and energy conservation is particularly important.
Disclosure of Invention
The invention aims to solve the technical problem of providing a summer indoor radiation type cooling system and a control method thereof, the utilization rate of residual cold recovery capacity is high, and radiation refrigeration and fresh air dehumidification are jointly operated to effectively prevent the condensation problem of radiation refrigeration.
In order to solve the technical problems, an embodiment of the invention provides a summer indoor radiant type cooling system, which comprises a heat exchange device and a radiant refrigerating device, wherein the heat exchange device comprises a first compressor, a gas-liquid separator, a four-way valve, a finned heat exchanger, a first expansion valve, a filter, a liquid storage device, a sleeve type heat exchanger and a shell-and-tube heat exchanger, a high-temperature refrigerant outlet of the first compressor is connected with a tube side inlet of the shell-and-tube heat exchanger through the four-way valve, a tube side outlet of the shell-and-tube heat exchanger is connected with an inlet of the liquid storage device, an outlet of the liquid storage device is connected with the finned heat exchanger through the first expansion valve and the filter, and a low-temperature refrigerant outlet of the finned heat exchanger is connected with a backflow port of the first compressor sequentially through the four-way valve and the gas-liquid separator; the double-pipe heat exchanger is connected in parallel to a pipeline between the shell-and-tube heat exchanger and the liquid storage device;
The radiation refrigerating device comprises a ceiling radiation plate and a wall radiation plate, wherein the ceiling radiation plate and the wall radiation plate are connected in parallel between a shell pass water inlet and a shell pass water outlet of the shell-and-tube heat exchanger.
The summer indoor radiation type cooling system further comprises a fresh air device, the fresh air device comprises a fresh air precooling device, a fresh air dehumidifying device, a fresh air reheating device, a wet film humidifying device and an air supply device, and an air outlet of the fresh air precooling device is sequentially connected with the fresh air dehumidifying device, the fresh air reheating device, the wet film humidifying device and the air supply device.
The ceiling radiation plate and the wall radiation plate are respectively connected with a shell pass water inlet and a shell pass water outlet of the shell-and-tube heat exchanger through respective water dividing and collecting devices.
Wherein, the water inlet and the water outlet of the double-pipe heat exchanger are respectively connected with a water supply device through a water supply pipe and a water return pipe.
Furthermore, the fresh air device also comprises 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 dehumidifying device are in circulating connection.
Preferably, the fresh air reheating device adopts a fin reheater, the fresh air dehumidifying device adopts a fin evaporator, the fresh air precooling device adopts a fin precooler, and the wet film humidifying device adopts a wet film humidifier.
The invention also provides a control method of the summer indoor radiation type cooling system, and outdoor environment temperature T0>At 30 ℃, the cooling mode of summer ceiling radiation and wall radiation is started, and the method comprises the following steps:
(1) high-temperature refrigerant discharged by the first compressor enters the finned heat exchanger through the four-way valve for heat exchange, is throttled and decompressed through the first expansion valve, then flows into the double-pipe heat exchanger through the filter and the liquid storage device for primary heat exchange, then enters the tube side of the shell-and-tube heat exchanger for heat exchange with water to be cooled in the shell side of the shell-and-tube heat exchanger to generate 18 ℃ high-temperature cold water, and enters the ceiling radiation plate and the wall radiation plate through the pipeline for cooling;
(2) the refrigerant in the tube pass of the shell-and-tube heat exchanger returns to the first compressor after flowing through the four-way valve and the gas-liquid separator;
(3) and (3) circulating refrigeration based on the steps (1) and (2).
Wherein, the step (1) comprises the following specific steps:
(1-1) outdoor ambient temperature T0>30 ℃ and relative humidity>When 60%, open summer furred ceiling radiation and wall body radiation refrigeration mode and new trend and handle the mode, including following step:
(1-1-1) residual cooling recovery process: high-temperature refrigerant steam discharged by the first compressor exchanges heat with the finned heat exchanger through the four-way valve, is throttled and depressurized through the first expansion valve, then sequentially flows through the filter and the liquid accumulator, and then exchanges heat with the primary heat of the double-pipe heat exchanger to generate cold water for precooling fresh air in the fresh air precooling device;
(1-1-2) allowing a refrigerant flowing out of the double-pipe heat exchanger to enter a pipe pass of the shell-and-tube heat exchanger, exchanging heat with water to be cooled in a shell pass of the shell-and-tube heat exchanger to generate high-temperature cold water at 18 ℃, and allowing the cold water to enter a ceiling radiation plate and a wall radiation plate through pipelines for cooling;
(1-1-3) after the fresh air precooled in the fresh air precooling device is dehumidified by a fresh air dehumidifying device, reheated by a fresh air reheating device and humidified by a wet film humidifying device in sequence, blowing fresh air into a room by an air supply device;
(1-2) outdoor ambient temperature T0>30 ℃ relative humidity<When 40%, open summer furred ceiling radiation and wall body radiation refrigeration mode and new trend air conditioner refrigeration mode, including following step:
(1-2-1) high-temperature refrigerant steam discharged by a first compressor passes through a four-way valve to exchange heat with a finned heat exchanger, is throttled and depressurized by a first expansion valve, then sequentially flows through a filter and a liquid storage device, exchanges heat with water to be cooled in a shell pass of a shell-and-tube heat exchanger to generate 18 ℃ high-temperature cold water, and enters a ceiling radiation plate and a wall radiation plate through pipelines to supply cold;
(1-2-2) refrigerating by a fresh air conditioner: after the fresh air precooled in the fresh air precooling device is dehumidified by the fresh air dehumidifying device, reheated by the fresh air reheating device and humidified by the wet film humidifying device in sequence, the fresh air is blown to the room by the air supply device;
The fresh air entering the fresh air dehumidifying device is subjected to refrigerant circulation refrigeration in advance: high-temperature refrigerant steam discharged by the second compressor flows through the double-pipe heat exchanger for heat exchange, is throttled and depressurized by the second expansion valve, exchanges heat in the fresh air dehumidifying device for fresh air, and then flows back to the second compressor, and thus the refrigerant is circulated for refrigeration.
The technical scheme of the invention has the following beneficial effects:
1. the invention can meet the requirements of multifunctional cooling of the unit and room humidity by changing different control logic modes according to different humidity differences of use places.
2. The traditional cooling system adopts cold water with the water temperature of 7 ℃, and the cold water for cooling in the indoor radiation type cooling system in summer provided by the invention is high-temperature cold water with the temperature of 18 ℃, so that the energy consumption and waste are greatly reduced, meanwhile, no blowing sense is caused by radiation refrigeration, and the requirement of living comfort of people is met.
3. The invention innovatively provides an air source heat pump residual heat and cold recovery method for processing fresh air humidity, and is provided with a whole set of fresh air processing mode for solving the problem of easy condensation.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is an enlarged view of the heat exchange unit of FIG. 1;
FIG. 3 is an enlarged view of the radiant cooling unit of FIG. 1;
FIG. 4 is an enlarged view of FIG. 1 at the location of the fresh air device;
FIG. 5 is a control flow chart of the present invention combining a double cooling mode with a fresh air processing mode;
fig. 6 is a control flow chart of the combination of the dual cooling mode and the fresh air conditioning mode according to the present invention.
Description of the reference numerals:
1-1, a first compressor; 1-2, a gas-liquid separator; 1-3, a four-way valve; 1-4, a finned heat exchanger; 1-5, a first expansion valve; 1-6, a filter; 1-7, a liquid reservoir; 1-8, double-pipe heat exchanger; 1-9, shell and tube heat exchangers; 1-10 parts of wall radiation plate; 1-11, ceiling radiant panels;
2-1, a second compressor; 2-2, a second expansion valve; 2-3, a fresh air reheating device; 2-4, a fresh air dehumidifying device; 2-5, a fresh air precooling device; 2-6, a wet film humidifying device; 2-7, an air supply device;
1. a No. 1 electromagnetic valve; 2. no. 2 electromagnetic valve; 3. no. 3 electromagnetic valve; 4. no. 4 electromagnetic valve; 5. no. 5 electromagnetic valve; 6. no. 6 electromagnetic valve; 7. a No. 7 electromagnetic valve; 8. no. 8 electromagnetic valve; 9. solenoid valve No. 9; 10. solenoid valve No. 10; 11. solenoid valve No. 11; 12. a No. 12 electromagnetic valve; 13. no. 13 electromagnetic valve; 14. solenoid valve No. 14; 15. no. 15 electromagnetic valve; 18. solenoid valve number 18; 19. solenoid valve No. 19; 20. solenoid valve No. 20.
Detailed Description
To make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-4, the invention provides a summer indoor radiant cooling system, which comprises a heat exchange device and a radiant refrigerating device, wherein the heat exchange device comprises 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 double-pipe heat exchanger 1-8 and a shell-and-tube heat exchanger 1-9, a high-temperature refrigerant outlet of the first compressor 1-1 is connected with a pipe pass inlet of the shell-and-tube heat exchanger 1-9 through the four-way valve 1-3, a pipe pass outlet of the shell-and-tube heat exchanger 1-9 is connected with an inlet of the liquid storage device 1-7, an outlet of the liquid storage device 1-7 is connected with the finned heat exchanger 1-4 through the first expansion valve 1-5 and the filter 1-6, a low-temperature refrigerant outlet of the finned heat exchanger 1-4 is connected with a reflux port of the first compressor 1-1 sequentially through a four-way valve 1-3 and a gas-liquid separator 1-2; the double-pipe heat exchanger 1-8 is connected in parallel to a pipeline between the shell-and-tube heat exchanger 1-9 and the reservoir 1-7. Wherein, the water inlet and the water outlet of the double-pipe heat exchanger 1-8 are respectively connected with a water supply device through a water supply pipe and a water return pipe.
The radiation refrigeration device comprises ceiling radiation plates 1-11 and wall radiation plates 1-10, wherein the ceiling radiation plates 1-11 and the wall radiation plates 1-10 are connected in parallel between a shell pass water inlet and a shell pass water outlet of a shell-and-tube heat exchanger 1-9. Preferably, the ceiling radiation plates 1-11 and the wall radiation plates 1-10 are respectively connected with the shell pass water inlet and the shell pass water outlet of the shell-and-tube heat exchanger 1-9 through respective water collecting and distributing devices.
The summer indoor radiation type cooling system further comprises a fresh air device, the fresh air device comprises a fresh air precooling device 2-5, a fresh air dehumidifying device 2-4, a fresh air reheating device 2-3, a wet film humidifying device 2-6 and an air supply device 2-7, and an air outlet of the fresh air precooling device 2-5 is sequentially connected with the fresh air dehumidifying device 2-4, the fresh air reheating device 2-3, the wet film humidifying device 2-6 and the air supply device 2-7.
The fresh air device also comprises a second compressor 2-1 and a second expansion valve 2-2, wherein the second compressor 2-1, the fresh air reheating device 2-3, the second expansion valve 2-2 and the fresh air dehumidifying device 2-4 are in circulating connection.
Preferably, the fresh air reheating device 2-3 is a fin reheater, the fresh air dehumidifying device 2-4 is a fin evaporator, the fresh air precooling device 2-5 is a fin precooler, and the wet film humidifying device 2-6 is a wet film humidifier.
In the invention, a pipeline between a shell-and-tube heat exchanger 1-9 and a reservoir 1-7 is provided with a No. 20 electromagnetic valve 20, a pipeline between the front side of the No. 20 electromagnetic valve 20 and a sleeve-type heat exchanger 1-8 is provided with a No. 2 electromagnetic valve 2, and a pipeline between the rear side of the No. 20 electromagnetic valve 20 and the sleeve-type heat exchanger 1-8 is provided with a No. 1 electromagnetic valve 1.
A pipeline between the outlet of the double-pipe heat exchanger 1-8 and the inlet of the fresh air precooling device 2-5 is provided with a No. 3 electromagnetic valve 3, and a pipeline between the outlet of the fresh air precooling device 2-5 and the inlet of the double-pipe heat exchanger 1-8 is provided with a No. 4 electromagnetic valve 4. And a No. 18 electromagnetic valve 18 is arranged on a water return pipe of the double-pipe heat exchanger 1-8, and a No. 19 electromagnetic valve 19 is arranged on a water supply pipe.
A No. 6 electromagnetic valve 6 is arranged on a pipeline between the outlet of the second compressor 2-1 and the inlet of the fresh air reheating device 2-3, and a No. 5 electromagnetic valve 5 is arranged on a pipeline between the front side of the No. 6 electromagnetic valve 6 and the inlet of the double-pipe heat exchanger 1-8. And a pipeline between the outlet of the fresh air reheating device 2-3 and the inlet of the fresh air dehumidifying device 2-4 is provided with a No. 8 electromagnetic valve 8, and a pipeline between the front side of the No. 8 electromagnetic valve 8 and the outlet of the double-pipe heat exchanger 1-8 is provided with a No. 7 electromagnetic valve 7.
And a No. 9 electromagnetic valve 9 is arranged on a water supply pipe of the wet film humidifying device 2-6.
The water outlet pipe of the shell and tube heat exchanger 1-9 is provided with a No. 10 electromagnetic valve 10, and the water return pipe is provided with a No. 11 electromagnetic valve 11. A No. 13 electromagnetic valve 13 is arranged on a pipeline between the front side of the No. 10 electromagnetic valve 10 and the water inlet of the wall radiation plate 1-10, and a No. 12 electromagnetic valve 12 is arranged on a pipeline between the water outlet of the wall radiation plate 1-10 and the front side of the No. 11 electromagnetic valve 11. No. 15 electromagnetic valves 15 are arranged on pipelines between the front sides of the No. 10 electromagnetic valves 10 and the water inlets of the suspended ceiling radiation plates 1-11, and No. 14 electromagnetic valves 14 are arranged on pipelines between the water outlets of the suspended ceiling radiation plates 1-11 and the front sides of the No. 11 electromagnetic valves 11.
The invention also provides a control method of the indoor radiation type cooling system in summer, and the outdoor environment temperature T0>And (2) starting summer ceiling radiation and wall radiation refrigeration modes at the temperature of 30 ℃, and comprising the following steps of:
(1) high-temperature refrigerant discharged by a first compressor 1-1 enters a finned heat exchanger 1-4 through a four-way valve 1-3 for heat exchange, is throttled and decompressed by a first expansion valve 1-5, then flows into a sleeve type heat exchanger 1-8 for primary heat exchange after passing through a filter 1-6 and a liquid reservoir 1-7, then enters a tube side of a shell and tube type heat exchanger 1-9 for heat exchange with water to be cooled in the shell side of the shell and tube type heat exchanger 1-9 to generate high-temperature cold water at 18 ℃, and enters a ceiling radiation plate 1-11 and a wall radiation plate 1-10 for cooling through a pipeline. The method comprises the following specific steps:
(1-1) outdoor ambient temperature T0>30 ℃ relative humidity>When 60%, open summer furred ceiling radiation and wall body radiation refrigeration mode and new trend processing mode, the step is as follows:
(1-1-1) residual cooling recovery process: high-temperature refrigerant steam discharged by a first compressor 1-1 exchanges heat with a finned heat exchanger 1-4 through a four-way valve 1-3, is throttled and depressurized through a first expansion valve 1-5, sequentially flows through a filter 1-6 and a liquid accumulator 1-7, and then exchanges heat with a sleeve type heat exchanger 1-8 primarily to generate cold water for precooling fresh air in a fresh air precooling device 2-5;
(1-1-2) the refrigerant flowing out of the double-pipe 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 high-temperature cold water at 18 ℃, and enters the ceiling radiation plates 1-11 and the wall radiation plates 1-10 through the pipeline for cooling;
(1-1-3) after the fresh air precooled in the fresh air precooling device 2-5 is dehumidified by the fresh air dehumidifying device 2-4, reheated by the fresh air reheating device 2-3 and humidified by the wet film humidifying device 2-6 in sequence, the fresh air is blown to the room by the air supply device 2-7. The step also comprises a refrigerant circulating process provided by a refrigerant circulating device, wherein the refrigerant circulating device is formed by circularly connecting a fresh air dehumidifying device 2-4, a second compressor 2-1, a fresh air reheating device 2-3 and a second expansion valve 2-2.
The flow chart of the control process is shown in fig. 5, in the cooling process, the solenoid valve 20 No. 20, the solenoid valve 5 No. 5 and the solenoid valve 7 No. 7 are closed, and the rest are all opened.
(1-2) outdoor ambient temperature T0>30 ℃ relative humidity<When 40%, open summer furred ceiling radiation and wall body radiation refrigeration mode and new trend air conditioner refrigeration mode, the step is as follows:
(1-2-1) high-temperature refrigerant steam discharged by a first compressor 1-1 exchanges heat with a finned heat exchanger 1-4 through a four-way valve 1-3, is throttled and depressurized through a first expansion valve 1-5, then sequentially flows through a filter 1-6 and a liquid reservoir 1-7, exchanges heat with water to be cooled in a shell pass of a shell and tube heat exchanger 1-9 to generate 18 ℃ high-temperature cold water, and enters a ceiling radiation plate 1-11 and a wall radiation plate 1-10 through a pipeline for cooling;
(1-2-2) fresh air conditioning refrigeration: the fresh air precooled in the fresh air precooling device 2-5 is dehumidified by a fresh air dehumidifying device 2-4, reheated by a fresh air reheating device 2-3 and humidified by a wet film humidifying device 2-6 in sequence, and then the fresh air is blown to the room by an air supply device 2-7;
the fresh air entering the fresh air dehumidifying device 2-4 is subjected to refrigerant cycle refrigeration in advance: high-temperature refrigerant steam discharged by the second compressor 2-1 flows through the double-pipe heat exchanger 1-8 for heat exchange, is throttled and depressurized by the second expansion valve 2-2, exchanges heat in the fresh air dehumidifying device 2-4 for fresh air, and then flows back to the second compressor 2-1, and the refrigerant is circulated for refrigeration.
(2) Refrigerant in the tube pass 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;
(3) and (3) circulating refrigeration based on the steps (1) and (2).
The flow chart of the control process is shown in fig. 6, in the cooling process, the solenoid valves 1, 2, 3, 4, 6 and 8 are closed, and the rest are all opened.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (8)

1. An indoor radiation type cooling system in summer is characterized by comprising a heat exchange device and a radiation refrigeration device, wherein the heat exchange device comprises 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 double-pipe heat exchanger (1-8) and a shell-and-tube heat exchanger (1-9), a high-temperature refrigerant outlet of the first compressor (1-1) is connected with a pipe pass inlet of the double-pipe heat exchanger (1-9) through the four-way valve (1-3), a pipe pass outlet of the shell-and-tube heat exchanger (1-9) is connected with an inlet of the liquid storage device (1-7), and an outlet of the liquid storage device (1-7) is connected with an inlet of the first shell-and-tube heat exchanger (1-5) and the filter (1-6) The low-temperature refrigerant outlet of the finned heat exchanger (1-4) is connected with the reflux port of the first compressor (1-1) through a four-way valve (1-3) and a gas-liquid separator (1-2) in sequence; the double-pipe heat exchanger (1-8) is connected in parallel on a pipeline between the shell-and-tube heat exchanger (1-9) and the liquid reservoir (1-7);
The radiation refrigeration device comprises ceiling radiation plates (1-11) and wall radiation plates (1-10), wherein the ceiling radiation plates (1-11) and the wall radiation plates (1-10) are connected in parallel between a shell pass water inlet and a shell pass water outlet of the shell-and-tube heat exchanger (1-9).
2. The summer indoor radiant cooling system as claimed in claim 1, further comprising a fresh air device, wherein the fresh air device comprises a fresh air pre-cooling device (2-5), a fresh air dehumidifying device (2-4), a fresh air reheating device (2-3), a wet film humidifying device (2-6) and an air supply device (2-7), and an air outlet of the fresh air pre-cooling device (2-5) is sequentially connected with the fresh air dehumidifying device (2-4), the fresh air reheating device (2-3), the wet film humidifying device (2-6) and the air supply device (2-7).
3. A summer indoor radiant cooling system as claimed in claim 1, wherein the ceiling radiant panels (1-11) and the wall radiant panels (1-10) are respectively connected with the shell-side water inlet and outlet of the shell-and-tube heat exchanger (1-9) through respective water collecting and distributing devices.
4. A summer indoor radiant cooling system as claimed in claim 1, wherein the water inlet and outlet of the double pipe heat exchanger (1-8) are connected to a water supply means through a water supply pipe and a water return pipe, respectively.
5. 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), and the second compressor (2-1), the fresh air reheating device (2-3), the second expansion valve (2-2) and the fresh air dehumidifying device (2-4) are in circulation connection.
6. The summer indoor radiant cooling system as claimed in claim 2, wherein the fresh air reheating device (2-3) is a fin reheater, the fresh air dehumidifying device (2-4) is a fin evaporator, the fresh air precooling device (2-5) is a fin precooler, and the wet film humidifying device (2-6) is a wet film humidifier.
7. A control method of indoor radiant cooling system in summer as claimed in any one of claims 1-6, characterized in thatAt an outdoor ambient temperature T0>At 30 ℃, the cooling mode of summer ceiling radiation and wall radiation is started, and the method comprises the following steps:
(1) high-temperature refrigerant discharged by a first compressor (1-1) enters a finned heat exchanger (1-4) through a four-way valve (1-3) for heat exchange, is throttled and decompressed through a first expansion valve (1-5), then flows into a double-pipe heat exchanger (1-8) through a filter (1-6) and a liquid storage device (1-7) for primary heat exchange, then enters a pipe pass of the shell-and-tube heat exchanger (1-9), exchanges heat with water to be cooled in the shell pass of the shell-and-tube heat exchanger (1-9) to generate high-temperature cold water at 18 ℃, and enters a ceiling radiation plate (1-11) and a wall radiation plate (1-10) through a pipeline for cooling;
(2) refrigerant in the tube pass of the shell-and-tube heat exchanger (1-9) returns to the first compressor (1-1) after passing through the four-way valve (1-3) and the gas-liquid separator (1-2);
(3) And (3) circulating refrigeration based on the steps (1) and (2).
8. The control method of indoor radiant cooling system in summer as claimed in claim 7, wherein the step (1) includes the following specific steps:
(1-1) outdoor ambient temperature T0>30 ℃ relative humidity>When 60%, open summer furred ceiling radiation and wall body radiation refrigeration mode and new trend processing mode, including following step:
(1-1-1) residual cooling recovery process: high-temperature refrigerant steam discharged by a first compressor (1-1) exchanges heat with a fin type heat exchanger (1-4) through a four-way valve (1-3), is throttled and depressurized through a first expansion valve (1-5), then sequentially flows through a filter (1-6) and a liquid storage device (1-7), and then primarily exchanges heat with a sleeve type heat exchanger (1-8) to generate cold water for precooling fresh air in a fresh air precooling device (2-5);
(1-1-2) refrigerant flowing out of the double-pipe heat exchanger (1-8) enters a pipe pass of the shell-and-tube heat exchanger (1-9), exchanges heat with water to be cooled in the shell pass of the shell-and-tube heat exchanger (1-9), generates high-temperature cold water at 18 ℃, and enters a ceiling radiation plate (1-11) and a wall radiation plate (1-10) through pipelines for cooling;
(1-1-3) after the fresh air precooled in the fresh air precooling device (2-5) is dehumidified by a fresh air dehumidifying device (2-4), reheated by a fresh air reheating device (2-3) and humidified by a wet film humidifying device (2-6), the fresh air is blown indoors by an air supply device (2-7);
(1-2) outdoor ambient temperature T0>30 ℃ relative humidity<When 40%, open summer furred ceiling radiation and wall body radiation refrigeration mode and new trend air conditioner refrigeration mode, including following step:
(1-2-1) high-temperature refrigerant steam discharged by a first compressor (1-1) exchanges heat with a finned heat exchanger (1-4) through a four-way valve (1-3), is throttled and depressurized through a first expansion valve (1-5), then sequentially flows through a filter (1-6) and a liquid storage device (1-7), exchanges heat with water to be cooled in a shell side of a shell-and-tube heat exchanger (1-9) to generate 18 ℃ high-temperature cold water, and enters a ceiling radiation plate (1-11) and a wall radiation plate (1-10) through pipelines for cooling;
(1-2-2) refrigerating by a fresh air conditioner: fresh air precooled in the fresh air precooling device (2-5) is dehumidified by the fresh air dehumidifying device (2-4), reheated by the fresh air reheating device (2-3) and humidified by the wet film humidifying device (2-6) in sequence, and then is blown indoors by the air supply device (2-7);
the fresh air entering the fresh air dehumidifying device (2-4) is subjected to refrigerant cycle refrigeration in advance: high-temperature refrigerant steam discharged by the second compressor (2-1) flows through the double-pipe heat exchanger (1-8) for heat exchange, is throttled and depressurized by the second expansion valve (2-2), then exchanges heat in the fresh air dehumidifying device (2-4) for fresh air, and then flows back to the second compressor (2-1), and the refrigerant is circulated for refrigeration.
CN202110032052.7A 2021-01-11 2021-01-11 Indoor radiation type cooling system in summer and control method thereof Pending CN114754518A (en)

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CN202110032052.7A CN114754518A (en) 2021-01-11 2021-01-11 Indoor radiation type cooling system in summer and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110032052.7A CN114754518A (en) 2021-01-11 2021-01-11 Indoor radiation type cooling system in summer and control method thereof

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CN114754518A true CN114754518A (en) 2022-07-15

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