CN114427718A - Double-cold-source indirect evaporation cooling unit - Google Patents
Double-cold-source indirect evaporation cooling unit Download PDFInfo
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- CN114427718A CN114427718A CN202210213122.3A CN202210213122A CN114427718A CN 114427718 A CN114427718 A CN 114427718A CN 202210213122 A CN202210213122 A CN 202210213122A CN 114427718 A CN114427718 A CN 114427718A
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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
- 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
- F24F3/044—Systems in which all treatment is given in the central station, i.e. all-air systems
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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
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/46—Improving electric energy efficiency or saving
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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
- 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
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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
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/20—Casings or covers
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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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
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
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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
- F25B39/00—Evaporators; Condensers
- F25B39/04—Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28C—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA COME INTO DIRECT CONTACT WITHOUT CHEMICAL INTERACTION
- F28C1/00—Direct-contact trickle coolers, e.g. cooling towers
- F28C1/14—Direct-contact trickle coolers, e.g. cooling towers comprising also a non-direct contact heat exchange
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D15/00—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies
- F28D15/02—Heat-exchange apparatus with the intermediate heat-transfer medium in closed tubes passing into or through the conduit walls ; Heat-exchange apparatus employing intermediate heat-transfer medium or bodies in which the medium condenses and evaporates, e.g. heat pipes
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Abstract
The invention provides a double-cold-source indirect evaporation cooling unit which comprises an evaporation end, a condensation end, a compressor, a throttling component and a unit sheet metal, wherein the evaporation end comprises a heat pipe evaporator, a compression refrigeration evaporator and a fan I; the condensation end comprises a heat pipe condenser, a water/refrigerant heat exchanger, a fan II and a spraying assembly; the spraying component comprises a water spraying device, a water collecting tray, a spraying pump and the like; the heat pipe evaporator and the heat pipe condenser are connected to form a heat pipe natural cooling heat exchange system, and the heat pipe condenser adopts two cooling modes of air cooling and evaporative condensation; the compression refrigeration evaporator, the compressor, the water/refrigerant heat exchanger and the throttling component are connected to form a compression refrigeration heat exchange system. The heat pipe natural cooling heat exchange system has the advantages that the heat pipe energy-saving technology and indirect evaporative cooling are effectively combined, the air-cooled and evaporative condensed heat pipe natural cooling heat exchange system is preferentially utilized, the utilization time of a natural cold source is long, and the energy-saving effect is obvious; the compression refrigeration heat exchange system is used for supplementing, spray water is secondarily utilized for cooling, and energy conservation to a greater extent is guaranteed.
Description
Technical Field
The invention belongs to the field of heat extraction of a high-heat-dissipation-density machine room, relates to an indirect evaporation cooling unit, and particularly relates to a double-cold-source indirect evaporation cooling unit.
Background
In the machine room, due to the large heat productivity of the equipment, special air conditioning equipment is needed to maintain the temperature in the machine room. The power consumption of air conditioning equipment in the machine room occupies a great proportion, and under the large environment of advocating energy conservation and reducing carbon emission, policies of newly building a data center and modifying a PUE limit value of the data center are formulated in partial areas, so that how to realize energy conservation of an air conditioning system of the machine room and reduce the whole PUE value of the data center become important points of industry attention.
The existing energy-saving technology of the air conditioner in the machine room comprises the following steps:
firstly, when the outdoor temperature is cool in transitional seasons or winter, outdoor fresh air is introduced to cool equipment in the machine room. The equipment can directly utilize an outdoor natural cold source, but cannot meet the requirements of air cleanliness and humidity regulation in a machine room, and the damage to a machine room maintenance structure is large. When the fresh air system stops working, the hidden trouble of air leakage exists, and indoor cold energy is lost when the weather is hot. The filter screen is required to be arranged at the air inlet and the air outlet of the fresh air system, the air resistance of the system is increased by the filter screen, the filter screen is required to be frequently replaced, and the maintenance amount is large.
And secondly, when the outdoor temperature is cool in a transition season or winter, the plate type air heat exchanger is used for introducing the cold energy of the outdoor air into the room. The technology realizes the isolation of indoor air and outdoor air, and avoids the problems of air cleanliness and humidity control caused by directly introducing outdoor air. However, because the heat exchanger adopts a honeycomb structure, the air flow passage is easily blocked by dust, so that filter screens are required to be installed at the inlet and outlet of the outdoor air flow passage, and the maintenance amount is large.
Thirdly, indirect evaporative cooling technology gradually popularized and applied in data centers in recent years, such as water side evaporative cooling technology in which cooling water is cooled by a water side indirect evaporative cooling tower and then directly supplied to an indoor side surface air cooler; and an air side indirect evaporative cooling technology is also adopted, a cold source and a tail end are integrated in one unit, and indirect heat exchange is carried out between outdoor air (after water spraying) and indoor air conditioner return air, so that the outdoor cold source is indirectly utilized. The two indirect evaporative cooling technologies can realize energy conservation of the machine room air conditioning system to a certain extent, but the problems that the natural cold source utilization time is not enough and the energy-saving effect still needs to be improved exist in different extents.
Disclosure of Invention
Aiming at the defects and characteristics of the prior art and the PUE limit requirement of a data center, the invention provides a double-cold-source indirect evaporation cooling unit, a heat pipe natural cooling heat exchange system which preferentially utilizes two cooling modes of air cooling and evaporative condensation is adopted by effectively combining a heat pipe energy-saving technology and indirect evaporation cooling, the utilization time of a natural cold source is long, and the energy-saving effect is obvious; the compression refrigeration heat exchange system is used for supplementing, spray water is secondarily utilized for cooling, and energy conservation to a greater extent is guaranteed.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a two indirect evaporation cold units in cold source, includes evaporating end, condensation end, compressor, throttling element, unit panel beating, its characterized in that:
the evaporation end comprises a heat pipe evaporator, a compression refrigeration evaporator and a fan I;
the condensation end comprises a heat pipe condenser, a water/refrigerant heat exchanger, a fan II and a spraying assembly;
the heat pipe evaporator and the heat pipe condenser are connected through an air pipe and a liquid pipe to form a heat pipe natural cooling heat exchange system, and a heat exchange refrigerant is filled in the heat pipe natural cooling heat exchange system;
the compression refrigeration evaporator, the compressor, the hot side of the water/refrigerant heat exchanger and the throttling component form a compression refrigeration heat exchange system through a connecting pipeline assembly, and a heat exchange refrigerant is filled in the compression refrigeration heat exchange system;
the spraying assembly comprises a water spraying device and a water collecting tray, wherein the water spraying device is arranged at the upper part of the heat pipe condenser and is provided with spraying holes, the water collecting tray is arranged at the bottom of the heat pipe condenser and is used for collecting spraying water, the water spraying device is connected with the water collecting tray through a spraying pipeline provided with a spraying pump through the cold side of the water/refrigerant heat exchanger, and the spraying pump is used for conveying the spraying water in the water collecting tray back to the water spraying device through the cold side of the water/refrigerant heat exchanger;
the unit metal plate comprises a unit shell, and a partition plate I, a partition plate II and a partition plate III which are arranged in the unit shell, wherein,
the clapboard III divides the unit shell into an indoor space and an outdoor space,
each part of the evaporation end is arranged in the indoor space, an indoor return air inlet and an indoor air supply outlet are formed in the side wall of the indoor space, indoor return air with high temperature enters the indoor space through the indoor return air inlet, cooled cold air is discharged into the room through the indoor air supply outlet, the fan I is installed near the indoor air supply outlet, the heat pipe evaporator and the compression refrigeration evaporator are installed on the upstream side of the air path of the fan I and form an air supply channel with the fan I through the partition plate I, and the fan I is used for extracting air in the air supply channel;
each part of the condensation end is arranged in the outdoor space, an outdoor air inlet and a fan mounting opening are formed in the side wall of the outdoor space, and the fan II is mounted at the fan mounting opening; the heat pipe condenser is installed on the upstream side of the air path of the fan II and forms an air exhaust channel with the fan II through the partition plate II, and the fan II is used for extracting air in the air exhaust channel.
Preferably, the heat pipe evaporator is disposed on the upstream side of the air path of the compression refrigeration evaporator, wherein,
when the indoor return air passes through the heat pipe evaporator and absorbs heat to reduce the temperature and the outlet air temperature reaches a first target value, the indoor return air is directly sent into the room to supply air without absorbing heat to reduce the temperature of the compression refrigeration evaporator, and the first target value is a heat pipe refrigeration heat exchange temperature threshold;
when the indoor return air passes through the heat pipe evaporator and absorbs heat to reduce the temperature, and the outlet air temperature is between a first target value and a second target value, the indoor return air firstly absorbs heat to reduce the temperature through the heat pipe evaporator and then absorbs heat to reduce the temperature through the compression refrigeration evaporator, wherein the second target value is larger than the first target value, and the second target value is a compression refrigeration heat exchange threshold value;
when the temperature of the heat pipe evaporator is larger than or equal to a second target value, the indoor return air does not absorb heat and is cooled through the heat pipe evaporator, and only the compression refrigeration evaporator absorbs heat and is cooled.
Preferably, the heat exchange refrigerant outlet of the heat pipe evaporator is arranged at the upper part of the heat pipe evaporator; the heat exchange refrigerant outlet of the heat pipe condenser is arranged at the lower part of the heat pipe condenser.
Preferably, the heat pipe condenser adopts two cooling modes of air cooling and evaporative condensation, preferably adopts the air cooling mode and secondly adopts the air cooling and evaporative condensation modes, the natural cold source has long utilization time, and the energy-saving effect is obvious.
Preferably, the cold side of the water/refrigerant heat exchanger is cooled by utilizing shower water for the second time, so that the energy conservation is ensured to a greater extent.
Preferably, the heat pipe natural cooling heat exchange system is preferentially utilized, and the compression refrigeration heat exchange system is used as supplement:
when an outdoor cold source meets the conditions, only the heat pipe natural cooling heat exchange system is started, the heat pipe condenser is preferentially air-cooled, at the moment, a liquid refrigerant in the heat pipe evaporator absorbs heat from indoor return air and evaporates, then enters the heat pipe condenser through the air pipe to be condensed into refrigerant liquid, then flows back to the heat pipe evaporator through the liquid pipe to continue heat absorption and evaporation, so that the indoor return air temperature is reduced and is conveyed back to the indoor through the fan I, the fan II is started for enhancing heat exchange, and the spray assembly is not started;
when an outdoor cold source meets the conditions, only the heat pipe natural cooling heat exchange system is started, but air cooling can not meet the requirements, air cooling and evaporative condensation are adopted, and at the moment, on the basis that only the heat pipe natural cooling heat exchange system is started and the heat pipe condenser adopts air cooling, the spraying assembly is started to strengthen condensation and prolong the utilization time of the natural cold source; at the moment, the spray pump is started, spray water in the water collecting tray is conveyed to the water spraying device by virtue of the spray pipeline, is sprayed to the surface of the heat pipe condenser through spray holes in the water spraying device, and is conveyed by the spray pump to realize circulation after being collected by the water collecting tray;
when only the heat pipe natural cooling heat exchange system is started and the air cooling and evaporative condensation can not meet the requirement, starting a compression refrigeration heat exchange system as supplement, starting the compression refrigeration heat exchange system on the basis of only starting the heat pipe natural cooling heat exchange system and adopting air cooling and evaporative type condensation, after the liquid refrigerant in the compression refrigeration evaporator absorbs the return air heat cooled by the heat pipe evaporator and evaporates into a gaseous state, the refrigerant enters the compressor for compression, then enters the hot side of the water/refrigerant heat exchanger for condensation into liquid refrigerant, enters the compression refrigeration evaporator after passing through the throttling component for continuous heat absorption and evaporation, therefore, after the indoor return air temperature is cooled to a preset value, the indoor return air is conveyed back to the room through the fan I, the refrigerant is condensed in the hot side of the water/refrigerant heat exchanger, and the condensation is realized through secondary utilization of spray water flowing through the cold side of the water/refrigerant heat exchanger.
Preferably, the condensation end still includes a moisturizing device, the moisturizing device is installed near the water-collecting tray, and it contains the emergent water tank of shower water, on the one hand can to the water-collecting tray additional spray required cooling water, on the other hand can ensure when the circumstances of cutting off the water supply sprays normal operating.
Preferably, a filler is optionally provided for enhancing heat dissipation.
Preferably, the heat exchanger I can be optionally mounted at the position of the outdoor air inlet, and a part of water in the water collecting tray is introduced through a precooling water pipeline to precool the outdoor air inlet.
Preferably, the cooling unit further comprises a control system for monitoring, controlling and switching the unit.
According to the technical scheme, the double-cold-source indirect evaporation cooling unit effectively combines a heat pipe energy-saving technology and indirect evaporation cooling, and preferentially utilizes a heat pipe natural cooling heat exchange system with two cooling modes of air cooling and evaporative condensation, so that the natural cold source is long in utilization time, and the energy-saving effect is obvious; the compression refrigeration heat exchange system is used for supplementing, spray water is secondarily utilized for cooling, and energy conservation to a greater extent is guaranteed.
Drawings
Fig. 1 is a schematic structural diagram of a double-cold-source indirect evaporation cooling unit of the invention.
Fig. 2 is a working principle diagram of the double-cold-source indirect evaporation cooling unit only adopting a heat pipe natural cooling heat exchange system, and a heat pipe condenser adopts air cooling and is selectively provided with a heat exchanger I but is not opened.
Fig. 3 is a working schematic diagram of the double-cold-source indirect evaporation cooling unit of the invention when the double-cold-source indirect evaporation cooling unit only adopts a heat pipe natural cooling heat exchange system, and the heat pipe condenser adopts two cooling modes of air cooling and evaporative condensation, and is selectively provided with a heat exchanger I and is opened.
FIG. 4 is a working schematic diagram of the double-cold-source indirect evaporation cooling unit of the invention adopting a heat pipe natural cooling heat exchange system, a heat pipe condenser adopting two cooling modes of air cooling and evaporative condensation, and a heat exchanger I selected and matched when being started and adopting a compression refrigeration heat exchange system for supplementary refrigeration.
Description of reference numerals:
the heat pipe type air conditioner comprises an evaporation end 1, a condensation end 2, a compressor 3, a throttling part 4, a unit sheet metal 5, a heat pipe evaporator 6, a compression refrigeration evaporator 7, a fan I8, a heat pipe condenser 9, a water/refrigerant heat exchanger 10, a fan II 11, a spraying assembly 12, a water spraying device 13, a water collecting tray 14, a spraying pump 15, an air pipe 16, a liquid pipe 17, a connecting pipeline assembly 18, a unit shell 19, a partition plate I20, a partition plate II 21, a partition plate III 22, an indoor air return opening 23, an air supply opening 24, an outdoor air inlet 25, a fan II mounting opening 26, a water supplementing device 27, filler 28, a control system 29, a spraying pipeline 30, a heat exchanger I31 and a precooling water pipeline 32.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments, which are part of the present invention, are not all embodiments, and are intended to be illustrative of the present invention and should not be construed as limiting the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a double-cold-source indirect evaporation cooling unit of the invention. As shown in fig. 1, the double-cold-source indirect evaporation cooling unit of the invention comprises an evaporation end 1, a condensation end 2, a compressor 3, a throttling component 4 and a unit sheet metal 5, wherein the evaporation end 1 comprises a heat pipe evaporator 6, a compression refrigeration evaporator 7 and a fan i 8; the condensation end 2 comprises a heat pipe condenser 9, a water/refrigerant heat exchanger 10, a fan II 11, a spraying assembly 12, a spraying pipeline 30 and the like; the spraying component 12 comprises a water spraying device 13, a water collecting tray 14, a spraying pump 15 and the like; the heat pipe evaporator 6 and the heat pipe condenser 9 are connected through an air pipe 16 and a liquid pipe 17 to form a heat pipe natural cooling heat exchange system, and a heat exchange refrigerant is filled in the heat pipe natural cooling heat exchange system; the compression refrigeration evaporator 7, the compressor 3, the hot side of the water/refrigerant heat exchanger 10 and the throttling component 4 form a compression refrigeration heat exchange system through a connecting pipeline component 18, and a heat exchange refrigerant is filled in the compression refrigeration heat exchange system; the water spraying device 13 is arranged at the upper part of the heat pipe condenser 9 and is provided with a spraying hole, the water collecting tray 14 is arranged at the bottom of the heat pipe condenser 9 and is used for collecting spraying water, the water spraying device 13 is connected with the water collecting tray 14 through a spraying pipeline 30 provided with a spraying pump 15 through the cold side of the water/refrigerant heat exchanger 10, the spraying pump 15 is used for conveying the spraying water in the water collecting tray 14 back to the water spraying device 13, and when the compression refrigeration heat exchange system runs, the spraying water in the water collecting tray 14 returns to the water spraying device 13 through the cold side of the water/refrigerant heat exchanger 10; the unit metal plate 5 comprises a unit shell 19, a partition plate I20, a partition plate II 21 and a partition plate III 22, wherein the partition plate III 22 divides the unit shell 19 into an indoor space and an outdoor space; each part of the evaporation end 1 is arranged in an indoor space, an indoor return air inlet 23 and an indoor air supply outlet 24 are formed in the side wall of the indoor space of the unit shell 19, indoor return air with high temperature enters the indoor space through the indoor return air inlet 23, cooled and cooled cold air is discharged into the indoor space through the indoor air supply outlet 24, a fan I8 is arranged near the indoor air supply outlet 24, a heat pipe evaporator 6 and a compression refrigeration evaporator 7 are arranged on the upstream side of a wind path of the fan I8 in the unit shell 19 and form an air supply channel with the fan I8 through a partition plate I20, and the fan I8 is used for extracting air in the air supply channel; each part of the condensation end 2 is arranged in the outdoor space, an outdoor air inlet 25 and a fan mounting opening 26 are formed in the unit shell 19, and the fan II 11 is mounted at the fan mounting opening 26; the heat pipe condenser 9 is arranged on the upstream side of an air path of a fan II 11 in the unit shell 19 and forms an exhaust channel with the fan II 11 through a partition plate II 21, and the fan II 11 is used for extracting air in the exhaust channel; the water/refrigerant heat exchanger 10, the compressor 3 and the throttle member 4 are installed at appropriate positions in the unit housing 19.
Furthermore, the heat pipe evaporator 6 is arranged at the upstream side of the air path of the compression refrigeration evaporator 7, when the air outlet temperature of the indoor return air after passing through the heat pipe evaporator 6 can reach a first target value, the indoor return air can be directly sent into the room for air supply without heat absorption and temperature reduction of the compression refrigeration evaporator 7, and the first target value is a heat pipe refrigeration heat exchange temperature threshold value; when the outlet air temperature of the indoor return air after passing through the heat pipe evaporator 6 is between a first target value and a second target value, the indoor return air firstly absorbs heat and is cooled through the heat pipe evaporator 6, and then absorbs heat and is cooled through the compression refrigeration evaporator 7, wherein the second target value is larger than the first target value, and the second target value is a compression refrigeration heat exchange threshold value; when the temperature of the heat pipe evaporator 6 is more than or equal to the target value 2, the indoor return air can absorb heat and reduce the temperature without passing through the heat pipe evaporator 6, and is directly reduced in temperature by the compression refrigeration evaporator 7. The heat exchange refrigerant outlet of the heat pipe evaporator 6 is arranged at the upper part of the heat pipe evaporator; the heat exchange refrigerant outlet of the heat pipe condenser 9 is arranged at the lower part thereof.
The heat pipe condenser 9 adopts two cooling modes of air cooling and evaporative condensation, air cooling is preferentially adopted, and air cooling and evaporative condensation are secondarily adopted, so that the natural cold source has long utilization time and remarkable energy-saving effect; the cold side of a water/refrigerant heat exchanger 10 in the compression refrigeration heat exchange system is cooled by utilizing spray water for the second time, so that the energy is saved to a greater extent; the heat pipe natural cooling heat exchange system and the compression refrigeration heat exchange system are preferably used as supplements; the condensation end 2 also comprises a water supplementing device 27, the water supplementing device 27 is arranged near the water collecting tray 14 and contains a spray water emergency water tank, on one hand, cooling water required by spraying can be supplemented to the water collecting tray 14, and on the other hand, normal operation of spraying can be guaranteed when water is cut off; optionally, a filler 28 for enhanced heat dissipation; a heat exchanger I31 can be optionally arranged at the position of the outdoor air inlet 25, and part of water in the water collecting tray 14 is introduced through a precooling water pipeline 32 to precool outdoor inlet air; and the control system 29 is used for monitoring, controlling and switching the units.
Fig. 2 is a working principle diagram of the double-cold-source indirect evaporation cooling unit only adopting a heat pipe natural cooling heat exchange system, and a heat pipe condenser adopts air cooling and is selectively provided with a heat exchanger I but is not opened. As shown in fig. 2, when the outdoor cold source meets the condition, only the heat pipe natural cooling heat exchange system is started, and the heat pipe condenser 9 preferentially adopts air cooling, at this time, the liquid refrigerant in the heat pipe evaporator 6 absorbs the heat from the indoor return air and evaporates, then enters the heat pipe condenser 9 through the air pipe 16 to be condensed into refrigerant liquid, and then flows back to the heat pipe evaporator 6 through the liquid pipe 17 to continue heat absorption and evaporation, so that the indoor return air temperature is reduced and is conveyed back to the indoor through the fan i 8, the fan ii 11 is started for enhancing heat exchange, and the spray assembly 12 is not started; at the moment, the flowing direction of the refrigerant in the heat pipe natural cooling heat exchange system is shown as an arrow A in the figure; the flowing directions of the indoor return air and the indoor supply air are shown as an arrow B in the figure; the outdoor air intake and exhaust air flow directions are shown by arrows C in the figure.
Fig. 3 is a working schematic diagram of the double-cold-source indirect evaporation cooling unit of the invention when the double-cold-source indirect evaporation cooling unit only adopts a heat pipe natural cooling heat exchange system, and the heat pipe condenser adopts two cooling modes of air cooling and evaporative condensation, and is selectively provided with a heat exchanger I and is opened. As shown in fig. 3, when the outdoor cold source meets the conditions, only the heat pipe natural cooling heat exchange system is started, but the air cooling cannot meet the requirements, the air cooling and evaporative condensation are adopted, at this time, the liquid refrigerant in the heat pipe evaporator 6 absorbs the heat from the indoor return air and evaporates, then enters the heat pipe condenser 9 through the air pipe 16 to be condensed into refrigerant liquid, and then flows back to the heat pipe evaporator 6 through the liquid pipe 17 to continue to absorb heat and evaporate, so that the indoor return air temperature is reduced and is conveyed back to the indoor through the fan i 8, the fan ii 11 is started for enhancing heat exchange, and the spraying component 12 is started for enhancing condensation and prolonging the utilization time of the natural cold source; at the moment, the spray pump 15 is started, spray water in the water collecting tray 14 is conveyed to the water spraying device 13 by virtue of the spray pipeline assembly 30, is sprayed to the surface of the heat pipe condenser 9 through spray holes on the water spraying device 13, is collected by the water collecting tray 14 and is conveyed by the spray pump 15 to realize circulation; the heat exchanger I31 is selectively installed, and a part of water in the water collecting tray 14 is introduced through a precooling water pipeline 32 to precool outdoor inlet air; at the moment, the flowing direction of the refrigerant in the heat pipe natural cooling heat exchange system is shown as an arrow A in the figure; the flowing directions of the indoor return air and the indoor supply air are shown as an arrow B in the figure; the outdoor air inlet and air outlet flow directions are shown as arrows C in the figure; the direction of water flow in the spray assembly 12 is shown by arrow D.
FIG. 4 is a working schematic diagram of the double-cold-source indirect evaporation cooling unit of the invention adopting a heat pipe natural cooling heat exchange system, a heat pipe condenser adopting two cooling modes of air cooling and evaporative condensation, and a heat exchanger I selected and matched when being started and adopting a compression refrigeration heat exchange system for supplementary refrigeration. As shown in fig. 4, when only the heat pipe natural cooling heat exchange system is started and the air cooling and evaporative condensation cannot meet the demand, the compression refrigeration heat exchange system is started to supplement, and at this time, for the heat pipe natural cooling heat exchange system, after the liquid refrigerant in the heat pipe evaporator 6 absorbs the heat from the indoor return air and evaporates, the liquid refrigerant enters the heat pipe condenser 9 through the air pipe 16 to be condensed into refrigerant liquid, and then flows back to the heat pipe evaporator 6 through the liquid pipe 17 to continue to absorb heat and evaporate, so that the indoor return air temperature is reduced and is conveyed back to the room through the fan i 8, the fan ii 11 is started to enhance heat exchange, and the spraying component 12 is started to enhance condensation and prolong the utilization time of the natural cold source; at the moment, the spray pump 15 is started, spray water in the water collecting tray 14 is conveyed to the spray device 13 by virtue of the spray pipeline 30, the spray water is sprayed to the surface of the heat pipe condenser 9 through spray holes in the spray device 13, the spray water is conveyed by the spray pump 15 to realize circulation after being collected by the water collecting tray 14, the heat exchanger I31 is selected and installed, and water in a part of the water collecting tray 14 is introduced through the precooling pipeline 32 to precool outdoor inlet air; for the compression refrigeration heat exchange system, liquid refrigerant in the compression refrigeration evaporator 7 absorbs return air heat cooled by the heat pipe evaporator 6 and evaporates into gas, the gas enters the compressor 3 for compression, then enters the hot side of the water/refrigerant heat exchanger 10 for condensation into refrigerant liquid, enters the compression refrigeration evaporator 7 through the throttling component 4 for continuous heat absorption and evaporation, so that the indoor return air is cooled to a preset value and then is conveyed back to the room through the fan I8, the refrigerant condenses in the hot side of the water/refrigerant heat exchanger 10, and the condensation is realized through secondary utilization of spray water flowing through the cold side of the water/refrigerant heat exchanger 10. At the moment, the flowing direction of the refrigerant in the heat pipe natural cooling heat exchange system is shown as an arrow A in the figure; the flowing directions of the indoor return air and the indoor supply air are shown as an arrow B in the figure; the outdoor air inlet and air outlet flow directions are shown as arrows C in the figure; the direction of water flow in the spray assembly 12 is shown by arrow D; the flow direction of the refrigerant in the compression refrigeration heat exchange system is shown as an arrow E in the figure.
According to the double-cold-source indirect evaporation cooling unit, the heat pipe energy-saving technology and indirect evaporation cooling are effectively combined, a heat pipe natural cooling heat exchange system adopting two cooling modes of air cooling and evaporative condensation is preferentially utilized, the utilization time of a natural cold source is long, and the energy-saving effect is obvious; the compression refrigeration heat exchange system is used for supplementing, spray water is secondarily utilized for cooling, and energy conservation to a greater extent is guaranteed.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the scope of the present invention.
The invention has not been described in detail and is part of the common general knowledge of a person skilled in the art.
Claims (10)
1. The utility model provides a two indirect evaporation cold units in cold source, includes evaporating end, condensation end, compressor, throttling element, unit panel beating, its characterized in that:
the evaporation end comprises a heat pipe evaporator, a compression refrigeration evaporator and a fan I;
the condensation end comprises a heat pipe condenser, a water/refrigerant heat exchanger, a fan II and a spraying assembly;
the heat pipe evaporator and the heat pipe condenser are connected through an air pipe and a liquid pipe to form a heat pipe natural cooling heat exchange system, and a heat exchange refrigerant is filled in the heat pipe natural cooling heat exchange system;
the compression refrigeration evaporator, the compressor, the hot side of the water/refrigerant heat exchanger and the throttling component form a compression refrigeration heat exchange system through a connecting pipeline assembly, and a heat exchange refrigerant is filled in the compression refrigeration heat exchange system;
the spraying assembly comprises a water spraying device and a water collecting tray, wherein the water spraying device is arranged at the upper part of the heat pipe condenser and is provided with spraying holes, the water collecting tray is arranged at the bottom of the heat pipe condenser and is used for collecting spraying water, the water spraying device is connected with the water collecting tray through a spraying pipeline provided with a spraying pump through the cold side of the water/refrigerant heat exchanger, and the spraying pump is used for conveying the spraying water in the water collecting tray back to the water spraying device through the cold side of the water/refrigerant heat exchanger;
the unit metal plate comprises a unit shell, and a partition plate I, a partition plate II and a partition plate III which are arranged in the unit shell, wherein,
the clapboard III divides the unit shell into an indoor space and an outdoor space,
each part of the evaporation end is arranged in the indoor space, an indoor return air inlet and an indoor air supply outlet are formed in the side wall of the indoor space, indoor return air with high temperature enters the indoor space through the indoor return air inlet, cooled cold air is discharged into the room through the indoor air supply outlet, the fan I is installed near the indoor air supply outlet, the heat pipe evaporator and the compression refrigeration evaporator are installed on the upstream side of the air path of the fan I and form an air supply channel with the fan I through the partition plate I, and the fan I is used for extracting air in the air supply channel;
each part of the condensation end is arranged in the outdoor space, an outdoor air inlet and a fan mounting opening are formed in the side wall of the outdoor space, and the fan II is mounted at the fan mounting opening; the heat pipe condenser is installed on the upstream side of the air path of the fan II and forms an air exhaust channel with the fan II through the partition plate II, and the fan II is used for extracting air in the air exhaust channel.
2. The dual cold source indirect evaporative cooling unit of claim 1, wherein: the heat pipe evaporator is disposed on the upstream side of the air passage of the compression refrigeration evaporator,
when the indoor return air passes through the heat pipe evaporator and absorbs heat to reduce the temperature and the outlet air temperature reaches a first target value, the indoor return air is directly sent into the room to supply air without absorbing heat to reduce the temperature of the compression refrigeration evaporator, and the first target value is a heat pipe refrigeration heat exchange temperature threshold;
when the indoor return air passes through the heat pipe evaporator and absorbs heat to reduce the temperature, and the outlet air temperature is between a first target value and a second target value, the indoor return air firstly absorbs heat to reduce the temperature through the heat pipe evaporator and then absorbs heat to reduce the temperature through the compression refrigeration evaporator, wherein the second target value is larger than the first target value, and the second target value is a compression refrigeration heat exchange threshold value;
when the temperature of the heat pipe evaporator is larger than or equal to a second target value, the indoor return air does not absorb heat and is cooled through the heat pipe evaporator, and only the compression refrigeration evaporator absorbs heat and is cooled.
3. The dual cold source indirect evaporative cooling unit of claim 1, wherein the heat exchange refrigerant outlet of the heat pipe evaporator is disposed at an upper portion thereof; the heat exchange refrigerant outlet of the heat pipe condenser is arranged at the lower part of the heat pipe condenser.
4. The set of claim 1, wherein the heat pipe condenser is air cooled or evaporative condensed, preferably air cooled, and then air cooled + evaporative condensed.
5. The double-cold-source indirect evaporative cooling unit as claimed in claim 1, wherein the cold side of the water/refrigerant heat exchanger in the compression refrigeration heat exchange system is cooled by using shower water for the second time, so that energy conservation to a greater extent is guaranteed.
6. The double-cold-source indirect evaporative cooling unit as claimed in claims 1, 4 and 5, wherein the heat pipe natural cooling heat exchange system is preferably utilized, and the compression refrigeration heat exchange system is used as supplement:
when an outdoor cold source meets the conditions, only a heat pipe natural cooling heat exchange system is started, and the heat pipe condenser is preferentially air-cooled, at the moment, a liquid refrigerant in the heat pipe evaporator absorbs heat from indoor return air and evaporates, enters the heat pipe condenser through the air pipe to be condensed into refrigerant liquid, then flows back to the heat pipe evaporator through the liquid pipe to continuously absorb heat and evaporate, so that the indoor return air temperature is reduced and is conveyed back to the indoor through the fan I, the fan II is started for enhancing heat exchange, and the spray assembly is not started;
when the outdoor cold source meets the conditions, only the heat pipe natural cooling heat exchange system is started, but air cooling can not meet the requirements, air cooling and evaporative condensation are adopted, and at the moment, on the basis that only the heat pipe natural cooling heat exchange system is started and the heat pipe condenser adopts air cooling, the spraying assembly is started to strengthen condensation and prolong the utilization time of the natural cold source; at the moment, the spray pump is started, spray water in the water collecting tray is conveyed to the water spraying device by virtue of the spray pipeline assembly, is sprayed to the surface of the heat pipe condenser through spray holes in the water spraying device, and is conveyed by the spray pump to realize circulation after being collected by the water collecting tray;
when only the heat pipe natural cooling heat exchange system is started and air cooling and evaporative condensation cannot meet the requirements, the compression refrigeration heat exchange system is started to supplement, at the moment, on the basis that only the heat pipe natural cooling heat exchange system is started and air cooling and evaporative condensation are adopted, the compression refrigeration heat exchange system is started, liquid refrigerant in the compression refrigeration evaporator in the compression refrigeration heat exchange system absorbs return air heat cooled by the heat pipe evaporator and evaporates into gas, the gas enters the compressor to be compressed, then enters the hot side of the water/refrigerant heat exchanger to be condensed into liquid refrigerant, then enters the compression refrigeration evaporator to continuously absorb heat and evaporate after passing through the throttling part, so that indoor return air is cooled to a preset value and then is conveyed back to the room through the fan I, and the refrigerant is condensed in the hot side of the water/refrigerant heat exchanger, by means of shower water which is reused in the cold side of the water/refrigerant heat exchanger.
7. The double-cold-source indirect evaporative cooling unit as claimed in claim 1, wherein the condensation end further comprises a water replenishing device, the water replenishing device is installed near the water collecting tray and contains a spray emergency water tank, on one hand, cooling water required for spraying can be replenished to the water collecting tray, and on the other hand, normal operation of spraying can be guaranteed when water supply is cut off.
8. The dual cold source indirect evaporative cooling unit of claim 1, wherein fillers are optionally added to enhance heat dissipation.
9. The double-cold-source indirect evaporation cooling unit as claimed in claim 1, wherein a heat exchanger i is optionally installed at the position of the outdoor air inlet, and a part of water in the water collecting tray is introduced through a precooling water pipeline to precool the outdoor air inlet.
10. The dual cold source indirect evaporative cooling unit of claim 1, further comprising a control system for monitoring, controlling and switching the unit.
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| CN202210213122.3A CN114427718A (en) | 2022-03-04 | 2022-03-04 | Double-cold-source indirect evaporation cooling unit |
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| CN202210213122.3A CN114427718A (en) | 2022-03-04 | 2022-03-04 | Double-cold-source indirect evaporation cooling unit |
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