CN112268326A - Indirect evaporative cooler and control method - Google Patents
Indirect evaporative cooler and control method Download PDFInfo
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- CN112268326A CN112268326A CN202011259222.7A CN202011259222A CN112268326A CN 112268326 A CN112268326 A CN 112268326A CN 202011259222 A CN202011259222 A CN 202011259222A CN 112268326 A CN112268326 A CN 112268326A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000007921 spray Substances 0.000 claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 59
- 238000001816 cooling Methods 0.000 claims description 30
- 239000000498 cooling water Substances 0.000 claims description 24
- 239000003595 mist Substances 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 2
- 238000004378 air conditioning Methods 0.000 abstract description 2
- 239000003570 air Substances 0.000 description 448
- 230000000694 effects Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000005057 refrigeration Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000003507 refrigerant Substances 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0035—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using evaporation
-
- 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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
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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
- F24F13/28—Arrangement or mounting of filters
-
- 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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F6/00—Air-humidification, e.g. cooling by humidification
- F24F6/02—Air-humidification, e.g. cooling by humidification by evaporation of water in the air
- F24F6/04—Air-humidification, e.g. cooling by humidification by evaporation of water in the air using stationary unheated wet elements
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/208—Liquid cooling with phase change
- H05K7/20827—Liquid cooling with phase change within rooms for removing heat from cabinets, e.g. air conditioning devices
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20709—Modifications to facilitate cooling, ventilating, or heating for server racks or cabinets; for data centers, e.g. 19-inch computer racks
- H05K7/20836—Thermal management, e.g. server temperature control
-
- 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
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- 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]
- Y02B30/54—Free-cooling systems
Abstract
The invention discloses an indirect evaporative cooler and a control method, and relates to the technical field of air conditioning equipment. Can effectively utilize natural cold air and improve the energy utilization rate to the maximum extent. The indirect evaporative cooler includes: the air conditioner comprises a unit shell, wherein a secondary air inlet and a secondary air outlet are formed in the unit shell; the unit shell is internally provided with a secondary air inlet, a secondary air inlet filter, a first temperature sensor, a secondary air inlet shutter switch, a secondary air precooling air-air heat exchanger, a secondary air surface cooler, a spray room, a wet film humidifier, an air-air plate type main heat exchanger, a secondary air return pipe and a secondary air exhaust outlet in sequence according to the flow direction of secondary air.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to an indirect evaporative cooler and a control method.
Background
With the development of the IDC (Internet Data Center) industry and the continuous progress of the technology level, the problem of the IDC energy efficiency is receiving more and more attention. China has made clear restriction requirements on energy consumption of IDC, the energy use coefficient of a data center needs to be lower than 1.4 in the future, and the air conditioner of the IDC is required to use a natural cold source as far as possible. The indirect evaporative cooling technology gradually enters the IDC air conditioner market because of the advantages of electricity saving, environmental protection, high efficiency and adoption of an air cold source.
The indirect evaporative cooling is to refrigerate by the evaporation and heat absorption of air to water, and when the used air has a large temperature difference between a dry bulb and a wet bulb, a good air cooling effect can be obtained. Therefore, the indirect evaporative cooling technology is extremely suitable for outdoor areas with large temperature difference between the wet and dry bulb temperature all the year round. Compared with direct evaporative cooling, indirect evaporative cooling has the advantages that the air humidity is controllable, indoor air and outdoor air are not in contact, the indoor air quality can be guaranteed, and the like. Generally speaking, after the indirect evaporative cooler is used, the air in dry areas and medium humidity areas can be treated to the specified temperature and humidity without using compression refrigeration, and the purpose of greatly reducing the power consumption is achieved.
Indirect evaporative cooling techniques are accomplished with indirect evaporative coolers. The indirect evaporative cooler in the current market mainly has two forms, namely a plate type indirect evaporative cooler and a heat pipe type indirect evaporative cooler. The plate-type indirect evaporative cooler has the advantages of high heat exchange efficiency, mature manufacturing process and more application at present. The main problems of narrow and small flow channel, easy blockage, especially in the situation of large dust content in air, rapid reduction of heat exchange efficiency along with the increase of operation time, large flow resistance, uneven water distribution and poorer infiltration capacity exist. Meanwhile, the used metal materials are easy to corrode, so that scaling, difficult maintenance and the like are caused. The heat pipe type indirect evaporative cooler has the advantages of uniform water distribution, easy formation of a stable water film and contribution to evaporative cooling. The main problem is that the occupied space is large.
In order to better save energy and protect environment, how to apply the indirect evaporative cooling technology to different scenes is a problem which is urgently needed to be solved at present, so that natural cold is effectively utilized, and the energy utilization rate is improved to the maximum extent.
Disclosure of Invention
The embodiment of the invention provides an indirect evaporative cooler and a control method, which can effectively utilize natural cold air and improve the energy utilization rate to the maximum extent.
An embodiment of the present invention provides an indirect evaporative cooler, including: the air conditioner comprises a unit shell, wherein a secondary air inlet and a secondary air outlet are formed in the unit shell;
the unit shell is internally provided with a secondary air inlet, a secondary air inlet filter, a first temperature sensor, a secondary air inlet shutter switch, a secondary air precooling air-air heat exchanger, a secondary air surface cooler, a spray chamber, a wet film humidifier, an air-air plate type main heat exchanger, a secondary air return pipe and a secondary air exhaust outlet in sequence according to the flow direction of secondary air;
and a secondary air inlet, a secondary air inlet filter, a first temperature sensor, a secondary air inlet shutter switch, a secondary air precooling air-air heat exchanger, a secondary air surface cooler, a spray chamber, a wet film humidifier, an air-air plate type main heat exchanger, a secondary air return pipe and a secondary air exhaust outlet are connected to form a circulation loop.
Preferably, the method further comprises the following steps: a secondary air bypass shutter switch;
the air inlet ends of the secondary air inlet shutter switch and the secondary air bypass shutter switch are communicated with the secondary air inlet filter;
and the air outlet end of the secondary air bypass shutter switch is communicated with the secondary air surface cooler.
Preferably, the device also comprises a secondary air exhaust shutter switch;
the secondary air exhaust outlet comprises a first secondary air exhaust outlet and a second secondary air exhaust outlet;
one end of the second secondary air exhaust outlet is communicated with the secondary air return pipe;
the air outlet end of the secondary air exhaust shutter switch is communicated with the first secondary air exhaust outlet; the first secondary air exhaust outlet and the primary air inlet are both arranged on the first side wall of the unit shell, and the first secondary air exhaust outlet is positioned below the primary air inlet;
and primary air entering through the primary air inlet exchanges heat with secondary air passing through the hollow plate type main heat exchanger.
Preferably, the air conditioner also comprises a secondary air return valve;
the secondary air return valve is arranged on the secondary air return pipe;
and a first secondary air exhaust fan is arranged on the first secondary air exhaust outlet, and the air inlet end of the secondary air return pipe is positioned below the secondary air exhaust shutter switch.
Preferably, the air conditioner also comprises a primary air exhaust port;
the primary air exhaust port and the secondary air inlet are both arranged on the second side wall of the unit shell, and the primary air exhaust port is positioned below the secondary air inlet;
and a primary air exhaust fan is arranged on the primary air exhaust port.
Preferably, the system further comprises circulating cooling water, one end of the circulating cooling water is communicated with the water tank, and the circulating cooling water is sequentially sent to the secondary air surface cooler, the spray chamber and the wet film humidifier by a variable frequency water pump arranged in the water tank;
the spray chamber comprises a water mist spray head, a water receiving disc and a water return pipe; the water mist spray head is positioned at the top end of the spray chamber, and the water receiving disc is positioned at the bottom end of the spray chamber and communicated with the water return pipe.
Preferably, the temperature sensor further comprises a first temperature sensor, a second temperature sensor and a third temperature sensor;
the first temperature sensor is arranged between the air-air plate type main heat exchanger and the primary air inlet and is used for detecting the temperature of secondary air after heat exchange from the air-air plate type main heat exchanger;
the second temperature sensor is arranged between the primary air inlet and the first secondary air outlet and used for detecting the temperature of primary air entering from the primary air inlet;
and the third temperature sensor is arranged behind the secondary air inlet filter and used for detecting the temperature of secondary air entering from the secondary air inlet.
The embodiment of the invention also provides a control method for the indirect evaporative cooler, which comprises the following steps:
when the temperature of secondary air entering from a secondary air inlet is higher than the set temperature and the second secondary air exhaust temperature, a secondary air inlet shutter switch is opened and a secondary air bypass shutter switch is closed, so that the secondary air passes through a secondary air precooling air-air heat exchanger, a secondary air surface cooler, a spray chamber and an air-air plate type main heat exchanger in sequence;
the secondary air through the air-air plate type main heat exchanger exchanges heat with primary air entering through the primary air inlet to form secondary air outlet, if the temperature of the secondary air outlet is lower than the temperature of the secondary air inlet, the secondary air exhaust shutter switch is closed or partially closed, and the secondary air outlet is discharged through a secondary air return pipe, a secondary air pre-cooling air-air plate heat exchanger and a second secondary air exhaust outlet.
Preferably, after the secondary air through empty board-like main heat exchanger carries out the heat transfer with the primary air that gets into through the primary air inlet and forms the secondary air-out, still include:
and if the secondary air outlet temperature is higher than the secondary air inlet temperature, opening a secondary air exhaust shutter switch, and closing a secondary air return valve to exhaust the secondary air outlet through a first secondary air exhaust fan.
Preferably, the method further comprises the following steps:
when the temperature of secondary air entering from a secondary air inlet is lower than a set temperature, a secondary air bypass shutter switch is opened and a secondary air inlet shutter switch is closed, so that the secondary air passes through a secondary air surface cooler, a spray chamber and an air-air plate type main heat exchanger in sequence;
and opening a secondary air exhaust shutter switch, and closing a secondary air return valve to discharge secondary air passing through the hollow plate type main heat exchanger through a first secondary air exhaust outlet.
The embodiment of the invention provides an indirect evaporative cooler and a control method, wherein the indirect evaporative cooler comprises: the unit shell is internally provided with a secondary air inlet, a secondary air inlet filter, a first temperature sensor, a secondary air inlet shutter switch, a secondary air precooling air-air heat exchanger, a secondary air surface cooler, a spray chamber, a wet film humidifier, an air-air plate type main heat exchanger, a secondary air return pipe and a secondary air outlet in sequence according to the flow direction of secondary air; and a secondary air inlet, a secondary air inlet filter, a first temperature sensor, a secondary air inlet shutter switch, a secondary air precooling air-air heat exchanger, a secondary air surface cooler, a spray chamber, a wet film humidifier, an air-air plate type main heat exchanger, a secondary air return pipe and a secondary air exhaust outlet are connected to form a circulation loop. The secondary air entering the cooler through the secondary air inlet flows through the secondary air pre-cooling air-air heat exchanger, the secondary air surface cooler, the spray chamber and the wet film humidifier and can perform pre-cooling heat exchange with the secondary air outlet and the circulating cooling water respectively, namely the secondary air absorbs the temperature of the secondary air outlet and the circulating cooling water, the temperature of the secondary air inlet is further reduced, and the refrigeration effect is realized. Compared with the existing direct evaporator, the cooler is not polluted by external media when air is treated, the humidity cannot be increased, the increase of the humidity load in a treated air chamber cannot be caused, and the cooling temperature is possibly lower than the temperature of a wet bulb along with an indirect evaporation mode. Therefore, the indirect evaporative cooler obtains cold energy by circulating cooling water, does not need a compressor and a refrigerant, and is green and environment-friendly.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front view of an indirect evaporative cooler provided in accordance with an embodiment of the present invention;
FIG. 2 is a top view of an indirect evaporative cooler provided in accordance with an embodiment of the present invention;
wherein, the primary air inlet 101, the primary air inlet filter 101-1, the primary air outlet 102, the primary air exhaust fan 102-1, the secondary air inlet 103, the secondary air inlet filter 103-1, the third temperature sensor 103-2, the first secondary air outlet 104-1, the first secondary air exhaust fan 104-2, the second secondary air outlet 105-1, the second secondary air exhaust fan 105-2, the secondary air inlet shutter switch 106-1, the secondary air bypass shutter switch 106-2 and the secondary air exhaust shutter switch 106-3; the air-air plate type heat exchanger comprises an air-air plate type main heat exchanger 107-1, a secondary air pre-cooling air-air plate type heat exchanger 107-2, a secondary air surface cooler 108, a spray chamber 109, a wet film humidifier 110, a secondary air return pipe 111-1, a secondary air return valve 111-2, a water tank 112-1 and a pressure sensor 112-2.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 schematically illustrates a front view of an indirect evaporative cooler provided by an embodiment of the present invention, fig. 2 schematically illustrates a top view of the indirect evaporative cooler provided by the embodiment of the present invention, and the indirect evaporative cooler provided by the embodiment of the present invention will be described in detail below with reference to fig. 1 and fig. 2.
As shown in fig. 1, the indirect evaporative cooler mainly comprises a unit housing, and a primary air inlet 101, a primary air outlet 102, a secondary air inlet 103, and a quadratic air outlet are arranged on two sides of the unit housing; the unit shell is internally and mainly provided with a secondary air pre-cooling air-air plate type heat exchanger 107-2, a secondary air surface cooler 108, a spray chamber 109, a wet film humidifier 110, a secondary air return pipe 111-1, a secondary air return valve 111-2 and other devices.
Specifically, as shown in fig. 1 and 2, the secondary air inlet 103 and the primary air outlet 102 are both disposed on one side wall of the unit housing, and the secondary air inlet 103 is located directly above the primary air outlet 102. The secondary air inlet filter 103-1 is arranged on a secondary air pipeline communicated with the secondary air inlet 103, the secondary air inlet filter 103-1 can select a filter with a primary filtering effect or a medium-level filtering effect, the specific selection mode can be determined according to the adaptive scene of the indirect evaporative cooler, and in the embodiment of the invention, the specific filtering effect of the secondary air inlet filter 103-1 is not limited.
Further, in order to be able to confirm the temperature of the secondary intake air flowing in through the secondary air intake port 103 at any time, it is preferable that a third temperature sensor 103-2 for detecting the real-time temperature of the secondary intake air from the secondary air intake port 103 is provided between the secondary air intake filter 103-1 and the secondary air intake port 103 or behind the secondary air intake filter 103-1. In the embodiment of the present invention, the specific type of the third temperature sensor 103-2 is not limited.
After the secondary air passes through the secondary air inlet filter 103-1 in the secondary air pipeline, whether the secondary air passes through the secondary air inlet shutter or the secondary air bypass shutter is determined according to the communication condition of the secondary air pipeline. Specifically, a secondary air inlet shutter and a secondary air bypass shutter are arranged in the unit shell, and a secondary air inlet shutter switch 106-1 and a secondary air bypass shutter switch 106-2 are also arranged in the unit shell. After the temperature of the secondary air entering the secondary air pipeline is detected by the third temperature sensor 103-2 each time, the controller may determine which louver switch is turned on and another louver switch is turned off according to the real-time temperature of the current secondary air, so that it may be determined through which louver the secondary air may pass and then circulate downward.
For example, if the controller determines that the secondary air needs to pass through the secondary air inlet louver according to the real-time temperature of the secondary air, the controller may control to open the secondary air inlet louver switch 106-1 and close the secondary air bypass louver, and then the secondary air passing through the secondary air pipeline may pass through the secondary air inlet louver. If the controller determines that the secondary air needs to pass through the secondary air bypass shutter according to the real-time temperature of the secondary air, the controller can control to open the secondary air bypass shutter switch 106-2 and close the secondary air inlet shutter, and then the secondary air passing through the secondary air pipeline can pass through the secondary air bypass shutter.
Further, secondary air entering through the secondary air inlet shutter flows into the secondary air pre-cooling air-air plate type heat exchanger 107-2 to exchange heat with secondary air exiting through the secondary air return pipe 111-1 and ready to be discharged from a secondary air outlet, and the heat exchange can also be called primary pre-cooling of the secondary air; it should be noted that, as shown in fig. 1, the secondary air exhaust outlet provided in the embodiment of the present invention includes two, i.e., a first secondary air exhaust outlet 104-1 and a second secondary air exhaust outlet 105-1. Specifically, the first secondary air outlet 104-1 and the primary air inlet 101 are both disposed on a first side wall of the unit housing, and the first secondary air outlet 104-1 is located below the primary air inlet 101, wherein a primary air inlet filter 101-1 is further disposed outside the primary air inlet 101. The second secondary air exhaust outlet 105-1 is located at the top end of the unit housing and is close to a second side wall provided with a secondary air inlet 103, and the second side wall is provided with a primary air exhaust outlet 102 and a secondary air inlet 103. The second secondary air outlet 105-1 is also provided with a second secondary air outlet fan 105-2, and secondary outlet air can be accelerated to be discharged from the second secondary air outlet 105-1 through the second secondary air outlet fan 105-2.
Further, after the primary precooling is completed, the secondary air enters the secondary air surface cooler 108, in the embodiment of the invention, the secondary air surface cooler 108 is similar to a radiator and comprises a plurality of surface cooling fins, a water inlet valve of the secondary air surface cooler 108 is arranged at the water inlet end of a water pipe communicated with the surface cooling fins, and a bypass pipe of the secondary air surface cooler 108 and a bypass valve of the secondary air surface cooler 108 are also arranged. In the embodiment of the invention, circulating cooling water flows in the secondary air surface cooler 108, and after the secondary air passes through the secondary air surface cooler 108, the secondary air is subjected to secondary precooling heat exchange with the secondary air surface cooler 108.
After the secondary air passes through the secondary air surface cooler 108, the secondary air enters the spray chamber 109, as shown in fig. 1, the top end of the spray chamber 109 comprises a plurality of water mist nozzles, a water receiving tray is arranged below the spray chamber 109, and a water return pipe is arranged at the bottom of the water receiving tray.
Specifically, circulating cooling water flows into the water inlet end of the water mist spray head, and the secondary air enters the spray chamber 109 to perform total heat exchange with sprayed water vapor, namely, part of the water vapor enters the secondary air through evaporation and absorbs heat to cool, so that the secondary air is subjected to third heat exchange when passing through the spray chamber 109, and the temperature of the secondary air passing through the spray chamber 109 is close to the dew point temperature.
Further, the secondary air passing through the shower chamber 109 continues to enter the wet film humidifier 110, so as to further absorb moisture and reduce temperature. In the embodiment of the present invention, a temperature and humidity sensor is disposed in the pipe of the wet film humidifier 110, and the temperature and humidity of the secondary air can be measured by the temperature and humidity sensor. Furthermore, the water inlet end of the wet film humidifier 110 is also provided with a pressure sensor 112-2 and a flow regulating valve.
It should be noted that the circulating cooling water comes from the water tank 112-1, specifically, a water inlet end of the circulating cooling water extends to the water tank 112-1 and is communicated with the water tank 112-1, and the variable frequency water pump arranged in the water tank 112-1 is used for supplying power to the circulating cooling water, and the circulating cooling water is sequentially sent to the secondary air surface cooler 108, the spray chamber 109 and the wet film humidifier 110.
Specifically, an outlet pipe of the circulating cooling water is communicated with a water inlet end of the secondary air surface cooler 108, and a secondary air surface cooler 108 water inlet valve arranged at the water inlet end of the secondary air surface cooler 108 is used for controlling the flow of the circulating cooling water entering the secondary air surface cooler 108.
One water outlet pipe of the circulating cooling water is communicated with the water inlet end of the water mist spray head, the water mist spray head sprays the circulating cooling water to the spray chamber 109, the water receiving tray arranged below the spray chamber 109 can recover the water in the spray chamber 109, and the water return pipe arranged at the bottom of the water receiving tray can discharge the recovered water. The other water outlet pipe of the circulating cooling water is communicated with the water inlet end of the wet film humidifier 110.
The secondary air after the four heat exchanges flows into the hollow plate type main heat exchanger 107-1 to meet the primary air entering through the primary air inlet 101, the secondary air absorbs the heat of the primary air, the fifth heat exchange is performed, and the temperature of the secondary air is higher than the dew point temperature, so that secondary air outlet is formed.
It should be noted that, as shown in fig. 1, since the first secondary air outlet 104-1 and the secondary air return pipe 111-1 are located below the primary air inlet 101, the secondary air can be discharged through the first secondary air outlet 104-1, or through the secondary air return pipe 111-1 and then through the second secondary air outlet 105-1.
Specifically, the first overfire air outlet 104-1 is sequentially provided with an overfire air exhaust shutter and a first overfire air exhaust fan from inside to outside, the overfire air exhaust shutter is controlled by an overfire air exhaust shutter switch 106-3, that is, by controlling the overfire air exhaust shutter switch 106-3, whether the overfire air can be exhausted through the first overfire air outlet 104-1 or not can be determined. Moreover, a secondary air return valve 111-2 is arranged on the secondary air return pipe 111-1, and whether secondary air can pass through the secondary air return pipe 111-1 or not can be controlled through the secondary air return valve 111-2 and then is discharged.
As shown in figure 1, the inlet of the secondary air return pipe 111-1 is positioned at the lower end of the first secondary air exhaust outlet 104-1, and the other end of the secondary air return pipe 111-1 passes through the secondary air pre-cooling air-air plate type heat exchanger 107-2 and then is connected with the second secondary air exhaust outlet 105-1.
In the embodiment of the invention, the air-air plate type main heat exchanger further comprises a first temperature sensor and a second temperature sensor, wherein the first temperature sensor is arranged between the air-air plate type main heat exchanger 107-1 and the primary air inlet 101 and is used for detecting the temperature of secondary air after heat exchange from the air-air plate type main heat exchanger 107-1; the second temperature sensor is arranged between the primary air inlet 101 and the first secondary air outlet 104-1 and is used for detecting the temperature of primary inlet air entering from the primary air inlet 101.
In order to describe the indirect evaporative cooler in more detail, the following describes a control method of the indirect evaporative cooler, and specifically includes the following steps:
and 102, exchanging heat between secondary air inlet of the air-air plate type main heat exchanger and primary air inlet entering through a primary air inlet to form secondary air outlet, closing or partially closing a secondary air exhaust shutter switch if the temperature of the secondary air outlet is lower than that of the secondary air inlet, and discharging the secondary air outlet through a secondary air return pipe, a secondary air pre-cooling air-air plate type heat exchanger and a second secondary air exhaust outlet.
In step 101, the real-time temperature of the secondary air is judged according to the third temperature sensor 103-2, when the temperature of the secondary air is higher than the set temperature and the air exhaust temperature of the second secondary air exhaust outlet 105-1, the secondary air intake shutter switch 106-1 is opened, the secondary air bypass shutter switch 106-2 is closed, so that the secondary air firstly flows through the secondary air pre-cooling air-air plate heat exchanger 107-2 and exchanges heat with the secondary air flowing out through the secondary air return pipe 111-1, namely, the primary heat exchange between the secondary air and the secondary air is carried out, which is called secondary air primary pre-cooling.
The secondary air enters the secondary air surface cooler 108 after being pre-cooled for the first time, and circulating cooling water is filled in a pipe of the secondary air surface cooler 108, so that the secondary air passes through the secondary air surface cooler 108 and then is subjected to secondary pre-cooling heat exchange with the secondary air surface cooler 108.
The secondary air after the secondary precooling passes through the secondary air surface cooler 108 and enters the spray chamber 109, and the total heat exchange is carried out between the secondary air and the water vapor sprayed in the spray chamber 109, namely part of the water vapor is evaporated and enters the secondary air, and the heat absorption and the temperature reduction are carried out. Therefore, when the secondary air passes through the spray chamber 109, the third heat exchange is carried out, and the temperature of the secondary air approaches the dew point temperature; then the secondary air enters the wet film humidifier 110 continuously to further absorb moisture and reduce temperature.
The secondary air after the fourth heat exchange flows into the hollow plate type main heat exchanger 107-1 to meet the primary air entering through the primary air inlet 101, the fifth heat exchange is performed, the secondary air absorbs the temperature of the primary air and becomes secondary air outlet, and the temperature of the secondary air outlet is higher than the dew point temperature.
In step 101, a situation is also included, the real-time temperature of the secondary air is judged according to the set third temperature sensor 103-2, if the inlet temperature of the secondary air is lower than the set temperature, the secondary air bypass shutter switch 106-2 is opened, the secondary air inlet shutter switch 106-1 is closed, the secondary air directly flows to the secondary air surface cooler 108 after passing through the secondary air inlet filter 103-1, and the secondary air surface cooler 108 perform primary heat exchange;
the secondary air after the first heat exchange passes through the secondary air surface cooler 108, enters the spray chamber 109, and performs total heat exchange with water vapor sprayed in the spray chamber 109, namely part of the water vapor is evaporated to enter the secondary air and absorbs heat to cool. Therefore, when the secondary air passes through the spray chamber 109, secondary heat exchange is performed, and the temperature of the secondary air approaches the dew point temperature; then the secondary air enters the wet film humidifier 110 continuously to further absorb moisture and reduce temperature.
The secondary air is directly exhausted into the ambient air through the first secondary air exhaust fan 104-2 after absorbing heat in the main heat exchanger.
In step 102, if it is determined that the secondary outlet air temperature is lower than the secondary inlet air temperature, the secondary air exhaust shutter switch 106-3 is fully closed or partially closed, and the secondary air return valve 111-2 is opened, that is, the secondary outlet air needs to be exhausted through the secondary air return pipe 111-1, the secondary air pre-cooling air-air plate heat exchanger 107-2 and the second secondary air exhaust outlet 105-1.
If the temperature of the secondary outlet air is higher than that of the secondary inlet air, the secondary air exhaust shutter switch 106-3 needs to be opened, the secondary air return valve 111-2 needs to be closed, and the secondary outlet air is exhausted into the ambient air through the first secondary air exhaust fan 104-2.
In summary, an embodiment of the present invention provides an indirect evaporative cooler and a control method thereof, the indirect evaporative cooler including: the unit shell is internally provided with a secondary air inlet, a secondary air inlet filter, a first temperature sensor, a secondary air inlet shutter switch, a secondary air precooling air-air heat exchanger, a secondary air surface cooler, a spray chamber, a wet film humidifier, an air-air plate type main heat exchanger, a secondary air return pipe and a secondary air outlet in sequence according to the flow direction of secondary air; and a secondary air inlet, a secondary air inlet filter, a first temperature sensor, a secondary air inlet shutter switch, a secondary air precooling air-air heat exchanger, a secondary air surface cooler, a spray chamber, a wet film humidifier, an air-air plate type main heat exchanger, a secondary air return pipe and a secondary air exhaust outlet are connected to form a circulation loop. The secondary air entering the cooler through the secondary air inlet flows through the secondary air pre-cooling air-air heat exchanger, the secondary air surface cooler, the spray chamber and the wet film humidifier and can perform pre-cooling heat exchange with the secondary air outlet and the circulating cooling water respectively, namely the secondary air absorbs the temperature of the secondary air outlet and the circulating cooling water, the temperature of the secondary air inlet is further reduced, and the refrigeration effect is realized. Compared with the existing direct evaporator, the cooler is not polluted by external media when air is treated, the humidity cannot be increased, the increase of the humidity load in a treated air chamber cannot be caused, and the cooling temperature is possibly lower than the temperature of a wet bulb along with an indirect evaporation mode. Therefore, the indirect evaporative cooler obtains cold energy by circulating cooling water, does not need a compressor and a refrigerant, and is green and environment-friendly.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An indirect evaporative cooler, comprising: the air conditioner comprises a unit shell, wherein a secondary air inlet and a secondary air outlet are formed in the unit shell;
the unit shell is internally provided with a secondary air inlet, a secondary air inlet filter, a first temperature sensor, a secondary air inlet shutter switch, a secondary air precooling air-air heat exchanger, a secondary air surface cooler, a spray chamber, a wet film humidifier, an air-air plate type main heat exchanger, a secondary air return pipe and a secondary air exhaust outlet in sequence according to the flow direction of secondary air;
and a secondary air inlet, a secondary air inlet filter, a first temperature sensor, a secondary air inlet shutter switch, a secondary air precooling air-air heat exchanger, a secondary air surface cooler, a spray chamber, a wet film humidifier, an air-air plate type main heat exchanger, a secondary air return pipe and a secondary air exhaust outlet are connected to form a circulation loop.
2. The indirect evaporative cooler of claim 1, further comprising: a secondary air bypass shutter switch;
the air inlet ends of the secondary air inlet shutter switch and the secondary air bypass shutter switch are communicated with a secondary air inlet filter;
and the air outlet end of the secondary air bypass shutter switch is communicated with the secondary air surface air cooler.
3. The indirect evaporative cooler of claim 1, further comprising a secondary air exhaust shutter;
the secondary air exhaust outlet comprises a first secondary air exhaust outlet and a second secondary air exhaust outlet;
one end of the second secondary air exhaust outlet is communicated with the secondary air return pipe;
the air outlet end of the secondary air exhaust shutter switch is communicated with the first secondary air exhaust outlet; the first secondary air exhaust outlet and the primary air inlet are both arranged on the first side wall of the unit shell, and the first secondary air exhaust outlet is positioned below the primary air inlet;
and primary air entering through the primary air inlet exchanges heat with secondary air passing through the hollow plate type main heat exchanger.
4. The indirect evaporative cooler of claim 3, further comprising a secondary air return valve;
the secondary air return valve is arranged on the secondary air return pipe;
and a first secondary air exhaust fan is arranged on the first secondary air exhaust outlet, and the air inlet end of the secondary air return pipe is positioned below the secondary air exhaust shutter switch.
5. The indirect evaporative cooler of claim 1, further comprising a primary air exhaust;
the primary air exhaust port and the secondary air inlet are both arranged on the second side wall of the unit shell, and the primary air exhaust port is positioned below the secondary air inlet;
and a primary air exhaust fan is arranged on the primary air exhaust port.
6. The indirect evaporative cooler of claim 1, further comprising circulating cooling water, said circulating cooling water being disposed at one end in communication with a water tank, said circulating cooling water being delivered by a variable frequency water pump disposed within said water tank in sequence to said secondary air surface cooler, said spray chamber and said wet film humidifier;
the spray chamber comprises a water mist spray head, a water receiving disc and a water return pipe; the water mist spray head is positioned at the top end of the spray chamber, and the water receiving disc is positioned at the bottom end of the spray chamber and communicated with the water return pipe.
7. The indirect evaporative cooler of claim 1, further comprising a first temperature sensor, a second temperature sensor, and a third temperature sensor;
the first temperature sensor is arranged between the air-air plate type main heat exchanger and the primary air inlet and is used for detecting the temperature of secondary air after heat exchange from the air-air plate type main heat exchanger;
the second temperature sensor is arranged between the primary air inlet and the first secondary air outlet and used for detecting the temperature of primary air entering from the primary air inlet;
and the third temperature sensor is arranged behind the secondary air inlet filter and used for detecting the temperature of secondary air entering from the secondary air inlet.
8. A control method for an indirect evaporative cooler as claimed in any one of claims 1 to 7, the method comprising:
when the temperature of secondary air entering from a secondary air inlet is higher than the set temperature and the second secondary air exhaust temperature, a secondary air inlet shutter switch is opened and a secondary air bypass shutter switch is closed, so that the secondary air passes through a secondary air precooling air-air heat exchanger, a secondary air surface cooler, a spray chamber and an air-air plate type main heat exchanger in sequence;
the secondary air through the air-air plate type main heat exchanger exchanges heat with primary air entering through the primary air inlet to form secondary air outlet, if the temperature of the secondary air outlet is lower than the temperature of the secondary air inlet, the secondary air exhaust shutter switch is closed or partially closed, and the secondary air outlet is discharged through a secondary air return pipe, a secondary air pre-cooling air-air plate heat exchanger and a second secondary air exhaust outlet.
9. The method of claim 8, wherein after the secondary air passing through the air-to-plate primary heat exchanger exchanges heat with the primary air entering through the primary air inlet to form secondary air outlet, the method further comprises:
and if the secondary air outlet temperature is higher than the secondary air inlet temperature, opening a secondary air exhaust shutter switch, and closing a secondary air return valve to exhaust the secondary air outlet through a first secondary air exhaust fan.
10. The method of claim 8, further comprising:
when the temperature of secondary air entering from a secondary air inlet is lower than a set temperature, a secondary air bypass shutter switch is opened and a secondary air inlet shutter switch is closed, so that the secondary air passes through a secondary air surface cooler, a spray chamber and an air-air plate type main heat exchanger in sequence;
and opening a secondary air exhaust shutter switch, and closing a secondary air return valve to discharge secondary air passing through the hollow plate type main heat exchanger through a first secondary air exhaust outlet.
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| CN202011259222.7A CN112268326A (en) | 2020-11-12 | 2020-11-12 | Indirect evaporative cooler and control method |
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| CN202011259222.7A CN112268326A (en) | 2020-11-12 | 2020-11-12 | Indirect evaporative cooler and control method |
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