CN113324286B - Refrigerating system and control method thereof - Google Patents

Refrigerating system and control method thereof Download PDF

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Publication number
CN113324286B
CN113324286B CN202110753133.6A CN202110753133A CN113324286B CN 113324286 B CN113324286 B CN 113324286B CN 202110753133 A CN202110753133 A CN 202110753133A CN 113324286 B CN113324286 B CN 113324286B
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water
communicated
valve
electromagnetic valve
output end
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CN113324286A (en
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吕东建
周挺
廖宜利
谢文科
李琪铎
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Guangdong Haiwu Technology Co Ltd
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Guangdong Haiwu Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/14—Heat exchangers specially adapted for separate outdoor units
    • F24F1/16—Arrangement or mounting thereof
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • 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
    • F24F11/89—Arrangement or mounting of control or safety devices
    • 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
    • F24F5/0046—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 using natural energy, e.g. solar energy, energy from the ground
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/29—High ambient temperatures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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

Abstract

The invention discloses a refrigerating system and a control method thereof, wherein outdoor air is dehumidified through a dehumidification unit, and internal moisture of the outdoor air is condensed and separated out in the dehumidification process; the outdoor air is contacted with water in the spraying device for heat exchange, the outdoor air is further cooled, and the outdoor air can help the outdoor unit to exchange heat, so that refrigeration in a high-humidity environment is realized; in the process, the water containing part receives water flowing down from the spraying device and the dehumidifying unit and circulates the water to the spraying device through the water pump assembly, when the water contacts with outdoor air in the spraying device, the temperature of the water is reduced due to evaporation and heat absorption of the water, if the water temperature is too high, the water is continuously circulated in the spraying device, the water containing part and the water pump assembly under the action of the valve device, and the water is continuously contacted with the outdoor air for heat exchange so as to reduce the water temperature in the water containing part, so that the outdoor unit can refrigerate in a high-temperature environment; namely, the refrigerating system has the characteristics of energy conservation and environmental protection and the refrigerating capacity under the high-temperature and high-humidity environment.

Description

Refrigerating system and control method thereof
Technical Field
The invention relates to the technical field of refrigeration equipment, in particular to a refrigeration system and a control method thereof.
Background
At present, with the popularization of the concept of energy conservation and environmental protection, a refrigeration device with energy conservation or low power consumption is sought after. Among them, the compressor in the refrigeration apparatus is the highest power consumption component, and other components are beginning to be considered to replace the compressor.
In order to protect environment, the refrigeration equipment in the prior art starts to consider how to fully utilize the outdoor cold source, so that a fluorine pump cycle utilizing the outdoor cold source and a cycle utilizing evaporative cooling of water to pre-cool the outdoor cold source are added on the basis of the existing compressor cycle, namely, when the outdoor environment temperature is low, the refrigeration equipment is switched into the fluorine pump cycle, the refrigerant subjected to heat exchange by the evaporator is directly conveyed to a condenser in the outdoor unit, so that heat exchange is performed with the outdoor cold source, and the cooled refrigerant is returned to the evaporator by the fluorine pump.
The refrigeration equipment cannot be applied to high-temperature and high-humidity environments, firstly because the heat exchange efficiency of the refrigerant and the outdoor cold source is low in the high-temperature environments, and secondly because the evaporative cooling efficiency of water is low in the high-humidity environments, the outdoor cold source cannot be cooled effectively. Therefore, there is a need to develop a refrigeration system that can operate in a high temperature and high humidity environment and is energy efficient and environmentally friendly.
Disclosure of Invention
The invention aims to provide a refrigerating system and a control method thereof, which are used for solving the problems that the existing refrigerating equipment cannot be compatible with high-temperature high-humidity environment operation, energy conservation and environmental protection.
To achieve the purpose, the invention adopts the following technical scheme:
a refrigerating system comprises an outdoor unit, wherein a dehumidification unit is arranged in the outdoor unit; a water containing part is arranged at one side of the bottom of the dehumidification unit in the outdoor unit; a water temperature sensor is arranged in the water containing part, and a water outlet of the water containing part is communicated with a water pump assembly through a pipeline; the water pump assembly is respectively communicated with one end of the first heat exchange unit and one end of the refrigeration water circulation pipeline through the valve device, and the other end of the first heat exchange unit and the other end of the refrigeration water circulation pipeline are both communicated with the same spraying device;
the water temperature sensor is electrically connected with the valve device and is used for enabling the valve device to control the water pump assembly to be communicated with the refrigeration water circulation pipeline and controlling the water pump assembly to be not communicated with the first heat exchange unit when the measured water temperature value is larger than a preset water temperature threshold value.
Optionally, a first condenser is arranged in the outdoor unit at one side of the spraying device away from the water containing part;
the output end of the first condenser is communicated with a liquid storage device, the output end of the liquid storage device is communicated with a pump body unit, the output end of the pump body unit is communicated with a second heat exchange unit, and the output end of the second heat exchange unit is communicated with the input end of the first condenser.
Optionally, the dehumidification unit is a compressor evaporator, an output end of the compressor evaporator is communicated with a compressor, an output end of the compressor is communicated with a second condenser, and an output end of the second condenser is communicated with an input end of the compressor evaporator;
the second condenser is arranged on one side, far away from the water containing part, of the spraying device.
Optionally, an electronic expansion valve is further communicated between the output end of the second condenser and the input end of the compressor evaporator.
Optionally, the valve device comprises a first solenoid valve and a second solenoid valve; the first electromagnetic valve is communicated between the output end of the water pump assembly and the input end of the spraying device; the second electromagnetic valve is communicated between the output end of the water pump assembly and the input end of the first heat exchange unit;
or, the valve device comprises a three-way valve, the input end of the three-way valve is communicated with the output end of the water pump assembly, the first output end of the three-way valve is communicated with the input end of the spraying device, and the second output end of the three-way valve is communicated with the input end of the first heat exchange unit.
Optionally, the dehumidifying unit is a moisture absorption block, and the moisture absorption block is used for absorbing water.
Optionally, the first heat exchange unit is a plate heat exchanger; the water inlet of the plate heat exchanger is communicated with the output end of the water pump assembly, and the water outlet of the plate heat exchanger is communicated with the input end of the spraying device;
the refrigerant outlet of the plate heat exchanger is communicated with a liquid storage device, the output end of the liquid storage device is communicated with a pump body unit, the output end of the pump body unit is communicated with a second heat exchange unit, and the output end of the second heat exchange unit is communicated with the refrigerant inlet of the plate heat exchanger;
the output end of the first condenser is communicated with an electronic expansion valve, the output end of the electronic expansion valve is communicated with a third heat exchange unit, the output end of the third heat exchange unit is communicated with a compressor, and the output end of the compressor is communicated with the input end of the first condenser.
Optionally, the indoor temperature sensor is arranged indoors;
a third electromagnetic valve is communicated between the output end of the first condenser and the input end of the electronic expansion valve;
a fourth electromagnetic valve is arranged between the refrigerant outlet of the plate heat exchanger and the input end of the third electromagnetic valve;
a fifth electromagnetic valve is arranged between the output end of the pump body unit and the input end of the electronic expansion valve;
a sixth electromagnetic valve is arranged between the output end of the pump body unit and the input end of the second heat exchange unit;
the indoor temperature sensor is respectively and electrically connected with the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve;
the compressor is connected with a first one-way valve in parallel, and a third one-way valve is arranged between the plate heat exchanger and the liquid storage device.
A control method of a refrigeration system, applied to the refrigeration system as described above, the control method comprising:
acquiring a water temperature value of the water containing part;
judging whether the water temperature value is larger than a preset water temperature threshold value or not;
if yes, controlling the valve device to enable the water pump assembly to be communicated with the refrigeration water circulation pipeline and enable the water pump assembly to be not communicated with the first heat exchange unit;
if not, the valve device is controlled to enable the water pump assembly to be not communicated with the refrigerating water circulation pipeline, and enable the water pump assembly to be communicated with the first heat exchange unit.
Optionally, the control method is applied to the refrigeration system as described above, and includes:
starting the pump body unit, controlling the third electromagnetic valve to be closed, controlling the fourth electromagnetic valve to be opened, controlling the fifth electromagnetic valve to be opened, and controlling the sixth electromagnetic valve to be closed;
acquiring an indoor temperature value;
judging whether the indoor temperature value is smaller than a preset indoor temperature threshold value or not;
if yes, maintaining the states of the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve;
if not, starting the compressor, controlling the third electromagnetic valve to be opened, and maintaining the states of the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve.
Compared with the prior art, the invention has the following beneficial effects:
according to the refrigerating system and the control method thereof, the outdoor air is dehumidified through the dehumidification unit, wherein the internal moisture of the outdoor air is condensed and separated out in the dehumidification process, and the temperature and the humidity are reduced; then, the outdoor air is contacted and exchanges heat with water sprayed out of the spraying device, and the outdoor air is further cooled due to the evaporation effect of the water, so that the outdoor air subjected to double cooling can help the outdoor unit to refrigerate in a high-humidity environment; in the process, the water containing part receives water flowing down from the spraying device and the dehumidifying unit and circulates the water to the spraying device through the water pump assembly, when the water contacts with outdoor air in the spraying device, the temperature of the water is reduced due to evaporation and heat absorption of the water, if the water temperature is too high, the water is continuously circulated in the spraying device, the water containing part and the water pump assembly under the action of the valve device, and the water is continuously contacted with the outdoor air for heat exchange so as to reduce the water temperature in the water containing part, so that the outdoor unit can refrigerate in a high-temperature environment; namely, the refrigerating system has the characteristics of energy conservation and environmental protection and the refrigerating capacity under the high-temperature and high-humidity environment.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and are not intended to limit the scope of the invention, since any modification, variation in proportions, or adjustment of the size, etc. of the structures, proportions, etc. should be considered as falling within the spirit and scope of the invention, without affecting the effect or achievement of the objective.
Fig. 1 is a schematic diagram of an overall structure of a refrigeration system according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of the overall structure of a refrigeration system according to a second embodiment of the present invention;
fig. 3 is a flow chart of a control method of a refrigeration system according to a third embodiment of the present invention;
fig. 4 is a flow chart of a control method of a refrigeration system according to a fourth embodiment of the present invention;
fig. 5 is a heat exchange schematic diagram of a refrigeration system according to an embodiment of the present invention.
Illustration of: 101. an outdoor bottom air inlet; 102. an outdoor top air outlet;
21. a dehumidifying unit; 22. a compressor; 23. a second condenser; 24. an electronic expansion valve; 25. a third heat exchange unit;
31. a spraying device; 32. a water containing part; 33. a water pump assembly; 34. a first heat exchange unit; 35. a refrigeration water circulation pipe;
41. a first condenser; 42. a liquid storage device; 43. a pump body unit; 44. a second heat exchange unit;
51. a first electromagnetic valve; 52. a second electromagnetic valve; 53. a third electromagnetic valve; 54. a fourth electromagnetic valve; 55. a fifth electromagnetic valve; 56. a sixth electromagnetic valve;
61. a first one-way valve; 62. a second one-way valve; 63. a third one-way valve; 64. and a fourth one-way valve.
Detailed Description
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. It is noted that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
As shown in fig. 1 to 5, fig. 1 is a schematic diagram of an overall structure of a refrigeration system according to a first embodiment of the present invention, fig. 2 is a schematic diagram of an overall structure of a refrigeration system according to a second embodiment of the present invention, fig. 3 is a schematic flow chart of a control method of a refrigeration system according to a third embodiment of the present invention, fig. 4 is a schematic flow chart of a control method of a refrigeration system according to a fourth embodiment of the present invention, and fig. 5 is a schematic heat exchange diagram of a refrigeration system according to a fourth embodiment of the present invention.
Example 1
The refrigerating system provided by the embodiment can be applied to high-temperature and high-humidity areas such as the south, and can fully utilize an outdoor cold source, so that the energy efficiency is effectively improved, and the refrigerating system has higher environmental protection performance.
As shown in fig. 1, the refrigeration system of the present embodiment includes an outdoor unit in which a dehumidification unit 21 is installed; in the outdoor unit, a water containing portion 32 is provided at one side of the bottom of the dehumidification unit 21; a water temperature sensor is arranged in the water containing part 32, and a water outlet of the water containing part 32 is communicated with a water pump assembly 33 through a pipeline; the water pump assembly 33 is respectively communicated with one end of the first heat exchange unit 34 and one end of the refrigeration water circulation pipeline 35 through a valve device, and the other end of the first heat exchange unit 34 and the other end of the refrigeration water circulation pipeline 35 are both communicated with the same spray device 31. The spraying device 31 includes a nozzle for spraying water, and a filler for evaporating a liquid such as a wet film is provided below the nozzle; in fig. 1, the components in the left frame line are components of the indoor unit, the components in the right frame line are components of the outdoor unit, and the first heat exchange unit 34 is disposed in the indoor unit.
The water temperature sensor is electrically connected with the valve device and is used for enabling the valve device to control the water pump assembly 33 to be communicated with the refrigerating water circulation pipeline 35 and controlling the water pump assembly 33 not to be communicated with the first heat exchange unit 34 when the measured water temperature value is larger than a preset water temperature threshold value.
For example, in connection with the heat exchange process of the refrigeration system described in fig. 5, the outdoor air is dehumidified by the dehumidifying unit 21, wherein the internal moisture of the outdoor air is condensed and separated out during the dehumidification process, and the temperature and the humidity are reduced (the state of the outdoor air is changed from 1 point to 2 points in fig. 5); then, the outdoor air is contacted and exchanges heat with the water sprayed out of the spraying device 31, and the outdoor air is further cooled (the state of the outdoor air is changed from 2 points to 3 points in fig. 5) due to the evaporation effect of the water, and the outdoor air subjected to double cooling can help the outdoor unit to realize refrigeration in a high-humidity environment; in this process, the water containing portion 32 receives water flowing down from the spraying device 31 and the dehumidification unit 21, and circulates the water to the spraying device 31 through the water pump assembly 33, when the water contacts with outdoor air in the spraying device 31, the temperature of the water is reduced due to evaporation and heat absorption of the water (the state of the water is changed from a point B to a point A in fig. 5), if the water temperature is too high, the water is circulated in the spraying device 31, the water containing portion 32 and the water pump assembly 33 continuously under the action of the valve device, and heat exchange is continuously performed with the outdoor air to reduce the water temperature in the water containing portion 32, so that the refrigeration of the outdoor unit in a high-temperature environment is realized; namely, the refrigerating system has the characteristics of energy conservation and environmental protection and the refrigerating capacity under the high-temperature and high-humidity environment.
Further, in the outdoor unit, a first condenser 41 is installed at a side of the shower device 31 remote from the water containing portion 32.
The output of first condenser 41 communicates there is reservoir 42, and the output of reservoir 42 communicates there is pump body unit 43, and the output of pump body unit 43 communicates there is second heat transfer unit 44, and the output of second heat transfer unit 44 communicates with the input of first condenser 41. The pump body unit 43 may be a fluorine pump or a refrigerant pump. The load can be determined according to the indoor return air temperature, and when the indoor return air temperature is greater than a preset threshold value, the frequencies of the pump unit 43, the water pump assembly 33 and the outdoor fan of the outdoor unit are increased to increase indoor cooling.
Further, the dehumidifying unit 21 is a compressor evaporator, an output end of the compressor evaporator is communicated with the compressor 22, an output end of the compressor 22 is communicated with the second condenser 23, an output end of the second condenser 23 is communicated with an input end of the compressor evaporator, and the second condenser 23 is arranged on one side, far away from the water containing part 32, of the spraying device 31.
The air dehumidifying system comprising the compressor 22, the second condenser 23 and the compressor evaporator can make the saturation temperature corresponding to the evaporating pressure of the refrigerant in the compressor evaporator lower than the dew point temperature of the outdoor air (but higher than 0 ℃), that is, the temperature of the refrigerant in the compressor evaporator before heat exchange is lower than the dew point value in fig. 5, and then dehumidify the outdoor air to achieve the effect of reducing the humidity and wet bulb temperature of the outdoor air.
Further, an electronic expansion valve 24 is also connected between the output of the second condenser 23 and the input of the compressor evaporator. For example, when the outdoor air temperature is high and the humidity is high, the saturation temperature corresponding to the evaporation pressure of the refrigerant in the compressor evaporator is maintained below the air dew point temperature (for example, the saturation temperature corresponding to the evaporation pressure is adjusted to 3-5 ℃ but not lower than 0 ℃ to prevent the evaporator from freezing) by adjusting the frequency of the compressor 22 and the opening degree of the electronic expansion valve 24, wherein the compressor refrigeration cycle is adopted as the dehumidification system, and the energy efficiency is higher.
In a specific embodiment, the valve arrangement comprises a first solenoid valve 51 and a second solenoid valve 52.
The first electromagnetic valve 51 is communicated between the output end of the water pump assembly 33 and the input end of the spraying device 31; the second solenoid valve 52 is connected between the output of the water pump assembly 33 and the input of the first heat exchange unit 34.
In another specific embodiment, the valve means may employ a three-way valve capable of communicating the water pump assembly 33 with the spray device 31 and/or capable of communicating the first heat exchange unit 34 with the spray device 31. Specifically, the first output end of the three-way valve is communicated with the input end of the spraying device 31, the second output end of the three-way valve is communicated with the input end of the first heat exchange unit 34, when the temperature of the water tray is too high, the input end of the three-way valve is communicated with the first output end, the input end of the three-way valve is not communicated with the second output end, and the temperature reduction of water is realized through circulation.
In the present embodiment, the first heat exchange unit 34 is a surface cooler, and the second heat exchange unit 44 is a refrigerant pump evaporator.
The refrigeration system of the present embodiment can handle a variety of situations, exemplary:
a. when the temperature and the humidity are high, the compressor 22, the water pump assembly 33 and the pump body unit 43 are operated simultaneously, and the compressor 22, the compressor evaporator, the electronic expansion valve 24 and the second condenser 23 can ensure that the saturation temperature corresponding to the evaporation pressure of the refrigerant in the compressor evaporator is maintained below the air dew point temperature, and the dehumidification effect is ensured; the surface cooler, the liquid storage device 42, the pump unit 43, the refrigerant pump evaporator and the first condenser 41 can ensure the refrigerating effect of the refrigerating system.
b. When the outdoor temperature is higher and the humidity is lower, the water pump assembly 33 and the pump body unit 43 are simultaneously operated, and the compressor 22 is not operated; when the indoor return air temperature is greater than the preset temperature threshold value, the compressor 22 is started to dehumidify and cool or equi-wet cool the outdoor air, so that cold water and cold air with lower temperature are prepared, and the indoor cold energy requirement is met.
c. When the outdoor temperature is low, the humidity is high, or when the outdoor air and the humidity are low, the pump body unit 43 is firstly operated, and the compressor 22 and the water pump assembly 33 are not operated; when the indoor return air temperature is greater than the preset temperature threshold, the compressor 22 and the water pump assembly 33 are started to dehumidify the outdoor air, and then the outdoor air and water in the spraying device 31 are subjected to evaporative cooling to prepare cold water and cold air with lower temperature, so that the indoor cold energy requirement is met.
In summary, the refrigeration system of the embodiment has the advantages of fully utilizing the outdoor cold source, having high energy efficiency and large refrigeration capacity, being compatible with high-temperature high-humidity environment, saving water resources and the like.
Example two
More specifically, as shown in fig. 2, the refrigeration system of the present embodiment includes an outdoor unit, on which an outdoor bottom air inlet 101 and an outdoor top air outlet 102 are formed, and an air flow channel is formed between the outdoor bottom air inlet 101 and the outdoor top air outlet 102; a dehumidifying unit 21 (not shown in fig. 2), a shower device 31 and a first condenser 41 are sequentially disposed in the air flow path. The shower device 31 includes a shower head for spraying water, and a filler for evaporating a liquid such as a wet film is provided below the shower head.
The first condenser 41 is arranged at one side of the spraying device 31 away from the water containing part 32; the output of first condenser 41 communicates there is reservoir 42, and the output of reservoir 42 communicates there is pump body unit 43, and the output of pump body unit 43 communicates there is second heat transfer unit 44, and the output of second heat transfer unit 44 communicates with the input of first condenser 41.
The outdoor unit is also internally provided with a water containing part 32, and the water containing part 32 is arranged at one side of the outdoor bottom air inlet 101 far away from the outdoor top air outlet 102; the water inlet end of the water containing portion 32 is used for receiving water flowing down from the dehumidification unit 21 and the spraying device 31, and the water outlet end of the water containing portion 32 is communicated with a water pump assembly 33.
The output end of the water pump assembly 33 is communicated with a valve device, the water pump assembly 33 is respectively communicated with the first heat exchange unit 34 and the refrigerating water circulation pipeline 35 through the valve device, and the input end of the spraying device 31 is respectively communicated with the output end of the first heat exchange unit 34 and the output end of the refrigerating water circulation pipeline 35.
A water temperature sensor is arranged in the water containing part 32 and is electrically connected with the valve device; when the water temperature value measured by the water temperature sensor is greater than the preset water temperature threshold value, the valve device controls the output end of the water pump assembly 33 to be communicated with the refrigerating water circulation pipeline 35, and controls the output end of the water pump assembly 33 not to be communicated with the first heat exchange unit 34.
For example, in connection with the heat exchange process of the refrigeration system described in fig. 5, the outdoor air is dehumidified by the dehumidifying unit 21, wherein the internal moisture of the outdoor air is condensed and separated out during the dehumidification process, and the temperature and the humidity are reduced (the state of the outdoor air is changed from 1 point to 2 points in fig. 5); then, the outdoor air is contacted and exchanges heat with the water sprayed out of the spraying device 31, and the outdoor air is further cooled (the state of the outdoor air is changed from 2 points to 3 points in fig. 5) due to the evaporation effect of the water, and the outdoor air subjected to double cooling exchanges heat with the first condenser 41, so that the outdoor unit can realize refrigeration in a high-humidity environment; in this process, the water containing portion 32 receives water flowing down from the spraying device 31 and the dehumidification unit 21, and circulates the water to the spraying device 31 through the water pump assembly 33, when the water contacts with outdoor air in the spraying device 31, the temperature of the water is reduced due to evaporation and heat absorption of the water (the state of the water is changed from a point B to a point A in fig. 5), if the water temperature is too high, the water is circulated in the spraying device 31, the water containing portion 32 and the water pump assembly 33 continuously under the action of the valve device, and heat exchange is continuously performed with the outdoor air to reduce the water temperature in the water containing portion 32, so that the refrigeration of the outdoor unit in a high-temperature environment is realized; namely, the refrigerating system has the characteristics of energy conservation and environmental protection and the refrigerating capacity under the high-temperature and high-humidity environment.
In one embodiment, the dehumidifying unit 21 is a hygroscopic block for absorbing water. Wherein the moisture absorbent blocks include, but are not limited to, activated carbon blocks, porous silicon blocks, and the like.
Further, the first heat exchange unit 34 is a plate heat exchanger; the water inlet of the plate heat exchanger is communicated with the output end of the water pump assembly 33, and the water outlet of the plate heat exchanger is communicated with the input end of the spraying device 31.
The refrigerant outlet of the plate heat exchanger is communicated with a liquid storage device 42, the output end of the liquid storage device 42 is communicated with a pump body unit 43, the output end of the pump body unit 43 is communicated with a second heat exchange unit 44, and the output end of the second heat exchange unit 44 is communicated with the refrigerant inlet of the plate heat exchanger.
The output end of the first condenser 41 is communicated with an electronic expansion valve 24, the output end of the electronic expansion valve 24 is communicated with a third heat exchange unit 25, the output end of the third heat exchange unit 25 is communicated with a compressor 22, and the output end of the compressor 22 is communicated with the input end of the first condenser 41. Wherein the third heat exchange unit 25 is a compressor evaporator.
Further, the indoor temperature sensor is arranged indoors.
A third electromagnetic valve 53 is connected between the output end of the first condenser 41 and the input end of the electronic expansion valve 24.
A fourth solenoid valve 54 is arranged between the refrigerant outlet of the plate heat exchanger and the input of the third solenoid valve 53.
A fifth solenoid valve 55 is provided between the output of the pump body unit 43 and the input of the electronic expansion valve 24. The pump body unit 43 is also connected in parallel with a fourth one-way valve 64.
A sixth solenoid valve 56 is provided between the output of the pump body unit 43 and the input of the second heat exchange unit 44.
The indoor temperature sensors are electrically connected to the third solenoid valve 53, the fourth solenoid valve 54, the fifth solenoid valve 55, and the sixth solenoid valve 56, respectively.
The compressor 22 is connected in parallel with a first one-way valve 61, and a third one-way valve 63 is arranged between the plate heat exchanger and the liquid storage device 42.
The refrigerating system provided in this embodiment can greatly prolong the operation time of the pump body unit 43, and at least includes cycle modes such as a mechanical mode refrigerating cycle, a heat pipe wet mode refrigerating cycle, and a heat pipe dry mode refrigerating cycle.
Wherein, the path of the mechanical mode refrigeration cycle is: the compressor 22, the second check valve 62, the first condenser 41, the third solenoid valve 53, the electronic expansion valve 24, and the third heat exchange unit 25 (which is a compressor evaporator);
the path of the heat pipe wet mode refrigeration cycle is: the pump body unit 43, the sixth electromagnetic valve 56, the second heat exchange unit 44 (which is a fluorine pump evaporator), the first heat exchange unit 34 (which is a plate heat exchanger), the third one-way valve 63 and the liquid storage device 42; the mechanical mode refrigeration cycle and the heat pipe wet mode refrigeration cycle can be circulated at the same time;
the path of the heat pipe dry mode refrigeration cycle is: the pump body unit 43, the fifth electromagnetic valve 55, the electronic expansion valve 24, the third heat exchange unit 25, the first check valve 61, the first condenser 41, the fourth electromagnetic valve 54 and the liquid storage device 42.
When the refrigerating capacity of the heat pipe dry mode refrigerating cycle is insufficient, the mechanical mode refrigerating cycle can be started to carry out auxiliary cold supplement, namely the heat pipe dry mode refrigerating cycle and the mechanical mode refrigerating cycle can exist at the same time; similarly, when the refrigerating capacity of the heat pipe wet mode refrigerating cycle is insufficient, the mechanical mode refrigerating cycle can be started to carry out auxiliary cooling, namely the heat pipe wet mode refrigerating cycle and the mechanical mode refrigerating cycle can also exist at the same time.
In summary, the refrigeration system provided in this embodiment includes the following effects: 1. the outdoor unit is integrated with the first heat exchange unit 34 (water cooling form) and the first condenser 41 (air cooling form), so that the occupied area is small, and the heat dissipation is more reliable; 2. the dew point temperature is used for cooling, so that the ring temperature of the pump body unit 43 for starting operation can be higher, the humidity requirement is lower, a natural cold source can be used all the time, and the energy-saving effect is better; 3. the outdoor unit can provide double cold sources; 4. the natural cold source is utilized to the maximum extent by expanding the operation modes of the refrigerating system (at least comprising a, a mechanical mode refrigerating cycle, b, a mechanical mode refrigerating cycle and a heat pipe wet mode refrigerating cycle, c, a heat pipe wet mode refrigerating cycle, d, a heat pipe dry mode refrigerating cycle, e, a heat pipe dry mode refrigerating cycle and a mechanical mode refrigerating cycle species mode), so that the operation energy efficiency is improved.
Example III
The control method of the refrigeration system provided in this embodiment is applied to the refrigeration systems in embodiments 1 and 2, as shown in fig. 3, and includes:
s101, acquiring a water temperature value of the water containing part 32;
s102, judging whether the water temperature value is larger than a preset water temperature threshold value or not;
if yes, S103, controlling the valve device to enable the water pump assembly 33 to be communicated with the refrigerating water circulation pipeline 35, and enabling the water pump assembly 33 not to be communicated with the first heat exchange unit 34;
if not, S104, the valve device is controlled to prevent the water pump assembly 33 from communicating with the refrigeration water circulation pipe 35 and to allow the water pump assembly 33 to communicate with the first heat exchange unit 34.
Specifically, when the water temperature in the water containing portion 32 is too high, the first electromagnetic valve 51 is communicated, and the second electromagnetic valve 52 is not communicated, so that water is continuously evaporated and cooled in the spraying device 31, and is continuously cooled until the water temperature in the water containing portion 32 is cooled to the target temperature, and the refrigerating system can be applied to a high-temperature and high-humidity environment.
Example IV
The control method of the present embodiment is applied to the refrigeration system in the second embodiment, as shown in fig. 4, and includes:
s201, starting a pump body unit, controlling the third electromagnetic valve to be closed, controlling the fourth electromagnetic valve to be opened, controlling the fifth electromagnetic valve to be opened, and controlling the sixth electromagnetic valve to be closed;
s202, acquiring an indoor temperature value;
s203, judging whether the indoor temperature value is smaller than a preset indoor temperature threshold value;
if yes, S204, maintaining the states of the third solenoid valve, the fourth solenoid valve, the fifth solenoid valve and the sixth solenoid valve;
if not, S205, the compressor is started, the third electromagnetic valve is controlled to be opened, and the states of the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve are maintained.
The two modes of the heat pipe dry mode refrigeration cycle, the heat pipe dry mode refrigeration cycle and the mechanical mode refrigeration cycle are switched, and it is to be understood that various starting conditions can be set to match the refrigeration system to have various modes; exemplary, 1, mechanical mode refrigeration cycle; 2. mechanical mode refrigeration cycle + heat pipe wet mode refrigeration cycle (started when sufficient moisture and insufficient outdoor cold source); 3. a heat pipe wet mode refrigeration cycle (started when moisture is sufficient and an outdoor cold source is sufficient); 4. a heat pipe dry mode refrigeration cycle (started when water is deficient and an outdoor cold source is sufficient); 5. a heat pipe dry mode refrigeration cycle+a mechanical mode refrigeration cycle (started when water is deficient and an outdoor cold source is insufficient); the second mode to the fourth mode of the modes utilize the pump body unit 43, so that the running time of the pump body unit 43 is greatly prolonged, the refrigeration efficiency of the refrigeration system is improved, and the environmental protection performance of the refrigeration system is improved.
In summary, the control method of the refrigeration system provided in this embodiment has the advantages of long operation time of the pump unit 43, full use of the outdoor cold source, high energy efficiency, large refrigeration capacity, compatibility with high-temperature and high-humidity environment, water resource saving, strong environmental protection performance, and the like.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A refrigeration system is characterized by comprising an outdoor unit, wherein a dehumidification unit (21) is arranged in the outdoor unit; a water containing part (32) is arranged at one side of the bottom of the dehumidification unit (21) in the outdoor unit; a water temperature sensor is arranged in the water containing part (32), and a water outlet of the water containing part (32) is communicated with a water pump assembly (33) through a pipeline; the water pump assembly (33) is respectively communicated with one end of the first heat exchange unit (34) and one end of the refrigeration water circulation pipeline (35) through a valve device, and the other end of the first heat exchange unit (34) and the other end of the refrigeration water circulation pipeline (35) are both communicated with the same spray device (31);
the water temperature sensor is electrically connected with the valve device and is used for enabling the valve device to control the water pump assembly (33) to be communicated with the refrigerating water circulation pipeline (35) and controlling the water pump assembly (33) not to be communicated with the first heat exchange unit (34) when the measured water temperature value is larger than a preset water temperature threshold value;
in the outdoor unit, a first condenser (41) is installed at one side of the spraying device (31) away from the water containing part (32).
2. The refrigeration system according to claim 1, wherein the output end of the first condenser (41) is communicated with a liquid storage device (42), the output end of the liquid storage device (42) is communicated with a pump body unit (43), the output end of the pump body unit (43) is communicated with a second heat exchange unit (44), and the output end of the second heat exchange unit (44) is communicated with the input end of the first condenser (41).
3. A refrigeration system according to claim 2, wherein the dehumidification unit (21) is a compressor evaporator, the output of which is in communication with a compressor (22), the output of which compressor (22) is in communication with a second condenser (23), the output of which second condenser (23) is in communication with the input of the compressor evaporator;
the second condenser (23) is arranged on one side of the spraying device (31) away from the water containing part (32).
4. A refrigeration system according to claim 3, wherein an electronic expansion valve (24) is also in communication between the output of the second condenser (23) and the input of the compressor evaporator.
5. A refrigeration system according to claim 2, wherein the valve means comprises a first solenoid valve (51) and a second solenoid valve (52); the first electromagnetic valve (51) is communicated between the output end of the water pump assembly (33) and the input end of the spraying device (31); the second electromagnetic valve (52) is communicated between the output end of the water pump assembly (33) and the input end of the first heat exchange unit (34);
or, the valve device comprises a three-way valve, the input end of the three-way valve is communicated with the output end of the water pump assembly (33), the first output end of the three-way valve is communicated with the input end of the spraying device (31), and the second output end of the three-way valve is communicated with the input end of the first heat exchange unit (34).
6. A refrigeration system according to claim 2, characterized in that the dehumidification unit (21) is a hygroscopic block for absorbing water.
7. A refrigeration system according to claim 6, wherein the first heat exchange unit (34) is a plate heat exchanger; the water inlet of the plate heat exchanger is communicated with the output end of the water pump assembly (33), and the water outlet of the plate heat exchanger is communicated with the input end of the spraying device (31);
the refrigerant outlet of the plate heat exchanger is communicated with a liquid storage device (42), the output end of the liquid storage device (42) is communicated with a pump body unit (43), the output end of the pump body unit (43) is communicated with a second heat exchange unit (44), and the output end of the second heat exchange unit (44) is communicated with the refrigerant inlet of the plate heat exchanger;
the output end of the first condenser (41) is communicated with an electronic expansion valve (24), the output end of the electronic expansion valve (24) is communicated with a third heat exchange unit (25), the output end of the third heat exchange unit (25) is communicated with a compressor (22), and the output end of the compressor (22) is communicated with the input end of the first condenser (41).
8. The refrigerant system as set forth in claim 7, further comprising an indoor temperature sensor disposed in the indoor space;
a third electromagnetic valve (53) is communicated between the output end of the first condenser (41) and the input end of the electronic expansion valve (24);
a fourth electromagnetic valve (54) is arranged between the refrigerant outlet of the plate heat exchanger and the input end of the third electromagnetic valve (53);
a fifth electromagnetic valve (55) is arranged between the output end of the pump body unit (43) and the input end of the electronic expansion valve (24);
a sixth electromagnetic valve (56) is arranged between the output end of the pump body unit (43) and the input end of the second heat exchange unit (44);
the indoor temperature sensor is electrically connected with the third electromagnetic valve (53), the fourth electromagnetic valve (54), the fifth electromagnetic valve (55) and the sixth electromagnetic valve (56) respectively;
the compressor (22) is connected with a first one-way valve (61) in parallel, and a third one-way valve (63) is arranged between the plate heat exchanger and the liquid storage device (42).
9. A control method of a refrigeration system according to claim 1, applied to the refrigeration system, the control method comprising:
acquiring a water temperature value of the water containing part;
judging whether the water temperature value is larger than a preset water temperature threshold value or not;
if yes, controlling the valve device to enable the water pump assembly to be communicated with the refrigeration water circulation pipeline and enable the water pump assembly to be not communicated with the first heat exchange unit;
if not, the valve device is controlled to enable the water pump assembly to be not communicated with the refrigerating water circulation pipeline, and enable the water pump assembly to be communicated with the first heat exchange unit.
10. A control method of a refrigeration system according to claim 9, applied to the refrigeration system according to claim 8, the control method comprising:
starting the pump body unit, controlling the third electromagnetic valve to be closed, controlling the fourth electromagnetic valve to be opened, controlling the fifth electromagnetic valve to be opened, and controlling the sixth electromagnetic valve to be closed;
acquiring an indoor temperature value;
judging whether the indoor temperature value is smaller than a preset indoor temperature threshold value or not;
if yes, maintaining the states of the third electromagnetic valve, the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve;
if not, starting the compressor, controlling the third electromagnetic valve to be opened, and maintaining the states of the fourth electromagnetic valve, the fifth electromagnetic valve and the sixth electromagnetic valve.
CN202110753133.6A 2021-07-02 2021-07-02 Refrigerating system and control method thereof Active CN113324286B (en)

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KR101305234B1 (en) * 2013-01-02 2013-09-06 주식회사 성지공조기술 Evaporative condeser with free cooling
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CN111256257A (en) * 2020-02-26 2020-06-09 西安工程大学 Evaporative cooling water chilling unit for dehumidifying solution dehumidifying moisture-permeable film
CN112944739B (en) * 2021-04-15 2023-05-16 广东海悟科技有限公司 Dual cycle refrigeration system using dew point temperature cooling and control method thereof

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