CN111140949A - Indirect evaporative cooling device and method - Google Patents
Indirect evaporative cooling device and method Download PDFInfo
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- CN111140949A CN111140949A CN201911170170.3A CN201911170170A CN111140949A CN 111140949 A CN111140949 A CN 111140949A CN 201911170170 A CN201911170170 A CN 201911170170A CN 111140949 A CN111140949 A CN 111140949A
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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
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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
- F24F13/22—Means for preventing condensation or evacuating condensate
- F24F13/222—Means for preventing condensation or evacuating condensate for evacuating condensate
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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
- F24F13/24—Means for preventing or suppressing noise
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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
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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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/001—Compression cycle type
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/20—Humidity
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Abstract
The invention relates to the technical field of air conditioning equipment, in particular to an indirect evaporative cooling device and method. The cooling device includes: the device comprises a shell, an air filter, an indirect evaporation end, a primary air fan, an indirect condensation end and a secondary air fan; a primary air inlet and a primary air outlet are formed in the side wall of one side of the shell, a secondary air inlet is formed in the side wall of the other side of the shell, and a secondary air outlet is formed in the top of the same side of the secondary air inlet; the primary air inlet, the air filter, the indirect evaporation end, the primary air fan and the primary air outlet are sequentially connected to form a primary air channel; the secondary air inlet, the indirect condensation end, the secondary air fan and the secondary air outlet are sequentially connected to form a secondary air duct; the indirect evaporation end and the indirect condensation end are connected to form a closed loop. Compared with the prior art, the cooling device and the cooling method are more environment-friendly and energy-saving and are suitable for various environments.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to an indirect evaporative cooling device and method.
Background
With the continuous progress of society and the continuous development of scientific technology, people are more and more concerned about the earth on which people depend to live, and most countries in the world fully recognize the importance of the environment to the development of human beings. All countries adopt active and effective measures to improve the environment and reduce pollution. The most important and urgent problem is the energy problem, which is to be solved fundamentally, except for searching new energy, energy saving is the key and the most direct and effective important measure at present, and in recent years, people have made great efforts on research of energy saving technology and product development.
Indirect evaporative cooling technology is gradually favored by people because of its advantages of electricity saving, environmental protection and high efficiency. Indirect evaporative cooling is refrigeration by heat absorption through evaporation of water, and good refrigeration effect can be achieved only under the condition that the used air has large dry-wet bulb temperature difference. Therefore, the indirect evaporative cooling technology is very suitable for the areas with large temperature difference of outdoor dry and wet bulbs in summer. Under the condition that the outdoor temperature is not very high, when the production requirement cannot be met by using the direct evaporative cooling of the water spraying chamber, the production requirement can be met by adopting the water spraying chamber and an indirect evaporative cooling mode under the condition that an artificial cold source is not added. Generally, after the indirect evaporative cooler is used, the temperature and humidity requirements of a workshop can be met in a dry area and a medium humidity area under the condition that mechanical refrigeration is not used. In non-dry areas and workshops with high humidity requirements such as air spinning, spooling and weaving, the air can be treated to the specified temperature and humidity by adopting an indirect cooling technology and combining with an air conditioning mode of a water spraying chamber, so that the aim of saving energy is fulfilled.
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 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 and realize the effective utilization of natural cold and the maximum improvement of the energy utilization rate becomes the problem which is urgently needed to be solved at present. There is a need for an environmentally friendly and energy efficient cooling apparatus and method suitable for use in a variety of environments.
Disclosure of Invention
In order to solve the above problems, the present invention provides an indirect evaporative cooling apparatus and method, which are environmentally friendly and energy-saving and suitable for various environments.
The technical scheme adopted by the invention is as follows:
an indirect evaporative cooling device comprising: the device comprises a shell, an air filter, an indirect evaporation end, a primary air fan, an indirect condensation end and a secondary air fan; a primary air inlet and a primary air outlet are formed in the side wall of one side of the shell, a secondary air inlet is formed in the side wall of the other side of the shell, and a secondary air outlet is formed in the top of the shell on the same side of the secondary air inlet; the air filter, the indirect condensation end, the primary air fan, the indirect evaporation end and the secondary air fan are positioned in the shell, wherein the primary air inlet, the air filter, the indirect evaporation end, the primary air fan and the primary air outlet are sequentially connected to form a primary air channel; the secondary air inlet, the indirect condensation end, the secondary air fan and the secondary air outlet are sequentially connected to form a secondary air duct; the indirect evaporation end and the indirect condensation end are connected to form a closed loop.
Specifically, the indirect evaporative cooling device of this scheme and traditional indirect evaporative cooling device's cooling principle are the same, all utilize natural cold volume to cool down indoor, but the indirect evaporative cooling device of this scheme and traditional indirect evaporative cooling device structurally have the fundamental difference. A primary air inlet and a primary air outlet of the traditional indirect evaporative cooling device are respectively arranged at two ends of a shell, and a primary air channel traverses the whole cooling device; the secondary air inlet is arranged at the bottom of the shell, and the secondary air outlet is arranged at the top of the shell. When primary air enters the primary air inlet from the outside under the action of the primary air fan, is filtered by the air filter and reaches the indirect evaporation end, secondary air enters the device from the outside, and the secondary air entering the device meets water in the device at the heat exchanger for evaporation. The primary air and the secondary air are subjected to heat exchange through evaporation. After the heat exchange is finished, the first air after being cooled is discharged into the room through the primary air outlet, and the second air is discharged back to the outside from the device. The indirect evaporative cooling device of the scheme is characterized in that the primary air inlet and the primary air outlet are arranged on one side of the shell, and the secondary air inlet and the secondary air outlet are arranged on the other side of the shell. When the air conditioner is used, the primary air inlet and the primary air outlet are both arranged indoors, indoor air is extracted and discharged through the primary air channel, and indoor air circulation is performed; the secondary air inlet and the secondary air outlet are arranged outdoors, and the secondary air channel draws and discharges outdoor air which is circulated by the outdoor air. The cooling device is designed in such a way that the primary air channel only circulates indoor air, so that the phenomenon that outdoor turbid air is extracted can be avoided, and the burden of an air filter is reduced; secondly, part of the device for loading the secondary air duct can be completely arranged outdoors, so that the influence of noise generated during the operation of the device on the indoor environment is reduced; and the secondary air outlet is arranged at the top of the shell at the same side with the secondary air inlet, and secondary air is discharged in the sky, so that the influence of air flow on other things can be avoided.
Further, still include: the water collecting tray, the spray water pump and the water distributor are sequentially connected through a water pipe, the water collecting tray is arranged below the indirect condensation end, the water distributor is arranged above the indirect condensation end, and a medium filter screen is arranged between the water collecting tray and the spray water pump.
When the air cooling of the secondary air does not meet the cooling capacity required by the device, the secondary air and the water are evaporated to supplement the cooling capacity required by the device. Specifically, water in the water collecting tray is conveyed to the water distributor through the spray water pump, and when secondary air enters the device and reaches the indirect condensation end, the water distributor above the indirect condensation end sprays the water on the surface of the indirect condensation end to interact with the secondary air to evaporate. When the evaporation heat exchange is finished, the residual water falls into a water collecting tray positioned below the indirect condensation end, and primary water circulation is completed. The water pipe between the water collecting tray and the spray water pump is provided with a medium filter screen, the medium in the water collecting tray is blocked outside the filter screen, and the filter screen is replaced or cleaned periodically, so that the water distributor can be effectively prevented from being blocked.
Further, still include: the air conditioner comprises an evaporator, a compressor, a condenser and a throttle valve, wherein a primary air inlet, an air filter, an indirect evaporation end, the evaporator, a primary air fan and a primary air outlet are sequentially connected to form a primary air channel; the secondary air inlet, the indirect condensation end, the condenser, the secondary air fan and the secondary air outlet are sequentially connected to form a secondary air duct; the evaporator, the compressor, the condenser and the throttle valve are connected in sequence to form a closed loop.
When an indirect evaporative cooler formed by an indirect evaporation end and an indirect condensation end cannot meet the cooling requirement of primary air, mechanical refrigeration is added, so that the indirect evaporative cooling and the mechanical refrigeration run simultaneously to meet the refrigeration requirement. In the primary air duct, the evaporator is arranged at the downstream of the indirect evaporation end, and in the secondary air duct, the condenser is arranged at the downstream of the indirect condensation end, so that natural cold can be fully utilized, the energy consumption of mechanical refrigeration is reduced, and the device is more energy-saving.
Further, still include: the system comprises a dry-wet bulb temperature sensor and a mode switching device, wherein the dry-wet bulb temperature sensor is connected with the mode switching device, and the mode switching device is respectively connected with a spray water pump and a compressor.
Specifically, the dry-wet bulb temperature sensor of the existing air conditioner is generally used for monitoring the temperature and humidity of the air in the current environment, and then the control system of the air conditioner adjusts the refrigeration intensity according to the monitoring result and the required temperature. Compared with the control system of the existing air conditioner, the control system of the scheme is additionally provided with the mode switching device, the dry-wet bulb temperature sensor monitors the temperature and the humidity of the surrounding environment and sends a detection result to the mode switching device, and the mode switching device determines whether to start the spray pump and the compressor or not according to the detection result and switches among three refrigeration modes of air cooling, evaporative cooling and mixed refrigeration. The cooling device can be switched to the most appropriate mode according to the temperature and the humidity of the surrounding environment, and the best energy-saving effect is achieved.
Furthermore, the secondary air inlet is formed in the side wall of the other end of the shell, opposite to the primary air outlet, and the side wall is formed by three sides of the bottom of the other end of the shell.
Specifically, the side walls of three sides of the bottom of one end of the shell are provided with secondary air inlets formed by continuous openings, so that the flow of secondary air is increased, and a better heat exchange effect is achieved.
Further, the heat exchanger formed by connecting the indirect evaporation end and the indirect condensation end is an integral heat pipe heat exchanger.
Specifically, the integral heat pipe heat exchanger has high heat transfer coefficient and large heat transfer temperature difference, can be flexibly disassembled, maintained and cleaned, and has smaller volume and lighter weight compared with the traditional heat exchanger.
A cooling method for a cooling apparatus as described above, the method comprising:
cooling: the indoor air is guided to flow into the primary air channel from the primary air inlet, the indoor air is filtered by the filter and then flows through the indirect evaporation end to be cooled, and the cooled indoor air is discharged from the primary air outlet under the action of the primary air fan;
and (3) heat release step: conducting flow to outdoor air, enabling the outdoor air to enter a secondary air duct from a secondary air inlet, absorbing heat of the outdoor air through an indirect condensation end, and discharging the outdoor air after absorbing heat from a secondary air outlet under the action of a secondary air fan;
a flowing refrigerant is arranged between the indirect evaporation end and the indirect condensation end to carry out heat transfer; when the indoor air reaches the indirect evaporation end, the refrigerant absorbs heat and then flows to the indirect condensation end; when the outdoor air reaches the indirect condensation end, the refrigerant transfers heat to the outdoor air and then flows to the indirect evaporation end.
Further, the cooling device further includes: the system comprises an evaporator, a compressor, a condenser and a throttle valve, wherein the evaporator, the compressor, the condenser and the throttle valve are sequentially connected to form a closed loop; the cooling method further comprises an evaporative cooling step: when the outdoor air reaches the indirect condensation end, the water distributor sprays water to the indirect condensation end.
Further, the cooling device further includes: an evaporator, a compressor, a condenser and a throttle valve; the cooling method further comprises a mixing step:
when the indoor air flows through the indirect evaporation end to be cooled, the cooled indoor air enters the evaporator to be cooled again;
when the outdoor air flows through the indirect condensation end to absorb heat, the outdoor air after absorbing heat enters the condenser to absorb heat again.
Further, the cooling device further includes: the system comprises a dry-wet bulb temperature sensor and a mode switching device, wherein the dry-wet bulb temperature sensor is connected with the mode switching device, and the mode switching device is respectively connected with a spray water pump and a compressor; the cooling method further comprises the monitoring step of:
the dry-wet bulb temperature sensor monitors the temperature and the humidity of air, and the mode switching device judges whether to perform an evaporative cooling step and a mixing step according to a monitoring result.
Compared with the prior art, the invention has the beneficial effects that:
(1) the air inlet and the air outlet of the primary air are designed at the same end of the device, so that the burden of the air filter is reduced, and the influence of noise generated during the operation of the device on the indoor environment is reduced.
(2) The air outlet of the secondary air adopts the design of being arranged at the top of the shell, so that the influence of air flow on other things is reduced.
(3) A medium filter screen is added between the water collecting tray and the spray water pump, so that the water distributor is effectively prevented from being blocked.
(4) The mode switching device is adopted, so that the device can be switched among three refrigeration modes of air cooling, evaporative cooling and mixed refrigeration, the cooling device is environment-friendly and energy-saving, and is suitable for various environments.
Drawings
FIG. 1 is a schematic diagram of the apparatus of the present invention;
FIG. 2 is a bottom view of the secondary air intake of the apparatus of the present invention;
in the figure: 11-indirect condensation end, 12-indirect evaporation end, 21-water collecting tray, 22-spray water pump, 24-water distributor, 25-secondary air fan, 31-compressor, 32-evaporator, 33-condenser, 34-throttle valve, 36-air filter, 37-primary air fan, 41-shell, 42-secondary air inlet, 43-primary air inlet, 44-primary air outlet and 45-secondary air outlet.
Detailed Description
The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
Examples
This embodiment provides an indirect evaporative cooling device, and fig. 1 is a schematic structural diagram of the device of the present invention, and as shown in the figure, the device includes: the device comprises a shell 41, an air filter 36, an indirect evaporation end 12, a primary air fan 37, an indirect condensation end 11 and a secondary air fan 25; a primary air inlet 43 and a primary air outlet 44 are formed in the side wall of one side of the shell 41, a secondary air inlet 42 is formed in the side wall of the other side, and a secondary air outlet 45 is formed in the top of the same side of the secondary air inlet 42; the air filter 36, the indirect condensation end 11, the primary air fan 37, the indirect evaporation end 12 and the secondary air fan 25 are positioned inside the shell 41, wherein the primary air inlet 43, the air filter 36, the indirect evaporation end 12, the primary air fan 37 and the primary air outlet 44 are sequentially connected to form a primary air channel; the secondary air inlet 42, the indirect condensation end 11, the secondary air fan 25 and the secondary air outlet 45 are sequentially connected to form a secondary air duct; the indirect evaporation end 12 and the indirect condensation end 11 are connected to form a closed loop.
Specifically, the indirect evaporative cooling device of the present embodiment uses natural cooling energy to cool the indoor space in the same cooling principle as the conventional indirect evaporative cooling device, but the indirect evaporative cooling device of the present embodiment is fundamentally different from the conventional indirect evaporative cooling device in structure. A primary air inlet 43 and a primary air outlet 44 of the traditional indirect evaporative cooling device are respectively arranged at two ends of the shell 41, and a primary air channel traverses the whole cooling device; the secondary air inlet 42 is arranged at the bottom of the shell 41, and the secondary air outlet 45 is arranged at the top of the shell 41. When the primary air enters the primary air inlet 43 from the outdoor under the action of the primary air fan 37, is filtered by the air filter 36 and reaches the indirect evaporation end 12, the secondary air enters the device from the outdoor, and the secondary air entering the device meets water in the device and is evaporated in the heat exchanger. The primary air and the secondary air are subjected to heat exchange through evaporation. After the heat exchange is completed, the first air after temperature reduction is discharged into the room through the primary air outlet 44, and the second air is discharged back to the outside from the device. The indirect evaporative cooling device of the present embodiment has a primary air inlet 43 and a primary air outlet 44 provided on one side of the casing 41, and a secondary air inlet 42 and a secondary air outlet 45 provided on the other side of the casing 41. When the air conditioner is used, the primary air inlet 43 and the primary air outlet 44 are both arranged indoors, and the primary air channel draws and discharges indoor air to realize indoor air circulation; the secondary air inlet 42 and the secondary air outlet 45 are arranged outdoors, and the secondary air channel draws and discharges outdoor air which is circulated by the outdoor air. The cooling device is designed in such a way that the primary air channel only circulates indoor air, so that the phenomenon that outdoor turbid air is extracted can be avoided, and the burden of the air filter 36 is reduced; secondly, part of the device for loading the secondary air duct can be completely arranged outdoors, so that the influence of noise generated during the operation of the device on the indoor environment is reduced; and a secondary air outlet 45 is arranged at the top of the shell, and secondary air is discharged upwards to avoid the influence of air flow on other things.
Further, still include: the indirect condensation water distributor comprises a water collecting tray 21, a spray water pump 22 and a water distributor 24, wherein the water collecting tray 21, the spray water pump 22 and the water distributor 24 are sequentially connected through water pipes, the water collecting tray 21 is arranged below the indirect condensation end 11, the water distributor 24 is arranged above the indirect condensation end 11, and a medium filter screen is arranged between the water collecting tray 21 and the spray water pump 22.
When the air cooling of the secondary air does not meet the cooling capacity required by the device, the secondary air and the water are evaporated to supplement the cooling capacity required by the device. Specifically, the water in the water collecting tray 21 is delivered to the water distributor 24 by the spray water pump 22, and when the secondary air enters the device and reaches the indirect condensation end 11, the water distributor 24 above the indirect condensation end 11 sprays water on the surface of the indirect condensation end 11 to interact with the secondary air to evaporate. When the evaporation heat exchange is finished, the residual water falls into the water collecting tray 21 positioned below the indirect condensation end 11, and primary water circulation is completed. A medium filter screen is arranged on a water pipe between the water collecting tray 21 and the spray water pump 22, a medium in the water collecting tray 21 is blocked outside the filter screen, and the filter screen is replaced or cleaned regularly, so that the water distributor 24 can be effectively prevented from being blocked.
Further, still include: the evaporator 32, the compressor 31, the condenser 33 and the throttle valve 34, wherein the primary air inlet 43, the air filter 36, the indirect evaporation end 12, the evaporator 32, the primary air fan 37 and the primary air outlet 44 are sequentially connected to form a primary air channel; the secondary air inlet 42, the indirect condensation end 11, the condenser 33, the secondary air fan 25 and the secondary air outlet 45 are sequentially connected to form a secondary air duct; the evaporator 32, the compressor 31, the condenser 33, and the throttle valve 34 are connected in this order to form a closed circuit.
When the indirect evaporative cooler formed by the indirect evaporation end 12 and the indirect condensation end 11 cannot meet the cooling requirement of primary air, mechanical refrigeration is added, so that the indirect evaporative cooling and the mechanical refrigeration run simultaneously to meet the refrigeration requirement. In the primary air duct, the evaporator 32 is arranged at the downstream of the indirect evaporation end 12, and in the secondary air duct, the condenser 33 is arranged at the downstream of the indirect condensation end 11, so that natural cold can be fully utilized, the energy consumption of mechanical refrigeration is reduced, and the device is more energy-saving.
Further, still include: the system comprises a dry-wet bulb temperature sensor and a mode switching device, wherein the dry-wet bulb temperature sensor is connected with the mode switching device, and the mode switching device is respectively connected with the spray water pump 22 and the compressor 31.
Specifically, the dry-wet bulb temperature sensor of the existing air conditioner is generally used for monitoring the temperature and humidity of the air in the current environment, and then the control system of the air conditioner adjusts the refrigeration intensity according to the monitoring result and the required temperature. Compared with the control system of the existing air conditioner, the control system of the embodiment is additionally provided with the mode switching device, the dry-wet bulb temperature sensor monitors the temperature and the humidity of the surrounding environment and sends a detection result to the mode switching device, and the mode switching device determines whether to start the spray pump 22 and the compressor 31 according to the detection result and switches between three refrigeration modes of air cooling, evaporative cooling and mixed refrigeration. The cooling device can be switched to the most appropriate mode according to the temperature and the humidity of the surrounding environment, and the best energy-saving effect is achieved.
Further, fig. 2 is a bottom view of the secondary air inlet of the device of the present invention, and as shown in the figure, the secondary air inlet 42 is formed on a side wall of the other end of the housing 41 opposite to the primary air outlet 44, and the side wall is a side wall of three sides of the bottom of the other end of the housing 41.
Specifically, the side walls of three sides of the bottom of one end of the housing 41 are provided with secondary air inlets 42 formed by continuous openings, so that the flow of secondary air is increased, and a better heat exchange effect is achieved.
Further, the heat exchanger formed by connecting the indirect evaporation end 12 and the indirect condensation end 11 is an integral heat pipe heat exchanger.
Specifically, the integral heat pipe heat exchanger has high heat transfer coefficient and large heat transfer temperature difference, can be flexibly disassembled, maintained and cleaned, and has smaller volume and lighter weight compared with the traditional heat exchanger.
A cooling method for a cooling apparatus as described above, the method comprising:
cooling: the indoor air is guided to enter the primary air channel from the primary air inlet 43, the indoor air is filtered by the filter and then flows through the indirect evaporation end 12 to be cooled, and the cooled indoor air is discharged from the primary air outlet 44 under the action of the primary air fan 37;
and (3) heat release step: the outdoor air is guided to enter the secondary air duct from the secondary air inlet 42, the outdoor air absorbs heat through the indirect condensation end 11, and the outdoor air after absorbing heat is discharged from the secondary air outlet 45 under the action of the secondary air fan 25;
the refrigerant flowing between the indirect evaporation end 12 and the indirect condensation end 11 is subjected to heat transfer; when the indoor air reaches the indirect evaporation end 12, the refrigerant absorbs heat and then flows to the indirect condensation end 11; when the outdoor air reaches the indirect condensation end 11, the refrigerant transfers heat to the outdoor air and then flows to the indirect evaporation end 12.
Further, the cooling device further includes: the system comprises an evaporator 32, a compressor 31, a condenser 33 and a throttle valve 34, wherein the evaporator 32, the compressor 31, the condenser 33 and the throttle valve 34 are sequentially connected to form a closed loop; the cooling method further comprises an evaporative cooling step: when the outdoor air reaches the indirect condensing end 11, the water distributor 24 sprays water to the indirect condensing end 11.
Further, the cooling device further includes: an evaporator 32, a compressor 31, a condenser 33, and a throttle valve 34; the cooling method further comprises a mixing step:
when the indoor air flows through the indirect evaporation end 12 to be cooled, the cooled indoor air enters the evaporator 32 to be cooled again;
when the outdoor air flows through the indirect condensation end 11 to absorb heat, the heat-absorbed outdoor air enters the condenser 33 to absorb heat again.
Further, the cooling device further includes: the system comprises a dry-wet bulb temperature sensor and a mode switching device, wherein the dry-wet bulb temperature sensor is connected with the mode switching device, and the mode switching device is respectively connected with a spray water pump 22 and a compressor 31; the cooling method further comprises the monitoring step of:
the dry-wet bulb temperature sensor monitors the temperature and the humidity of air, and the mode switching device judges whether to perform an evaporative cooling step and a mixing step according to a monitoring result.
The working principle and the working process of the indirect evaporative cooling device of the embodiment are briefly described as follows:
an indirect evaporative cooling device of this embodiment uses wet-and-dry bulb temperature-sensing ware to monitor air on every side, and is lower when dry bulb temperature, when the cooling demand is not big, the device starts dry-type natural cold running mode, and compressor 31 and spray pump 22 all do not open under this mode, only utilize microthermal secondary forced air cooling volume to satisfy the cooling demand. The specific process is as follows:
firstly, indoor air is guided to enter a primary air duct, the air entering the primary air duct flows to the indirect evaporation end 12 after being processed by the air filter 36, the indirect evaporation end 12 absorbs heat and cools the air, and the cooled air is discharged from the primary air outlet 44 under the action of the primary air fan 37. When the primary air duct works, outdoor air enters the secondary air duct from the secondary air inlet 42, and after the air entering the secondary air duct reaches the indirect condensation end 11, the air exchanges heat with the indirect condensation end 11, and the air taking away heat of the indirect condensation end 11 is discharged through the secondary air outlet 45 under the action of the secondary air fan 25. The indirect evaporation end 12 and the indirect condensation end 11 are connected with each other to form a closed loop, and a refrigerant flows in the loop. After absorbing the heat of the air in the primary air duct, the indirect evaporation end 12 transfers the heat to the indirect condensation end 11 through the refrigerant, and the indirect condensation end 11 exchanges heat with the air in the secondary air duct. Finally, after the heat of the indirect condensation end 11 obtained by the indirect evaporation end 12 is absorbed, the air in the secondary air channel is discharged from the secondary air outlet 45, and the refrigerant flows back to the indirect evaporation end 12 under the action of the internal driving force to complete a cycle.
When the wet bulb temperature is lower and the dry-wet bulb temperature difference is larger, the device starts an evaporative cooling operation mode, the spray water pump 22 is started in the mode, the compressor 31 is not started, and the cooling requirement is met by evaporative cooling. The method comprises the following specific steps:
firstly, indoor air is guided to enter a primary air duct, the air entering the primary air duct flows to the indirect evaporation end 12 after being processed by the air filter 36, the indirect evaporation end 12 absorbs heat and cools the air, and the cooled air is discharged from the primary air outlet 44 under the action of the primary air fan 37. When the primary air duct works, outdoor air enters the secondary air duct from the secondary air inlet 42, and after the air entering the secondary air duct reaches the indirect condensation end 11, the air exchanges heat with the indirect condensation end 11, and the air taking away heat of the indirect condensation end 11 is discharged through the secondary air outlet 45 under the action of the secondary air fan 25. When the air entering the secondary air duct reaches the indirect condensation end 11, the spray water pump 22 starts to operate, and conveys the water in the water collection tray 21 to the water distributor 24, and the water is sprayed on the indirect condensation end 11 through the water distributor 24 and is contacted with the air flowing through the indirect condensation end 11 to evaporate, so that the heat of the indirect condensation end 11 is absorbed, and the evaporated residual water falls back to the water collection tray 21 to complete one spray water circulation. The indirect evaporation end 12 and the indirect condensation end 11 are connected with each other to form a closed loop, and a refrigerant flows in the loop. After absorbing the heat of the air in the primary air duct, the indirect evaporation end 12 transfers the heat to the indirect condensation end 11 through the refrigerant, and the indirect condensation end 11 exchanges heat with the air and water in the secondary air duct. Finally, after the heat of the indirect condensation end 11 obtained by the indirect evaporation end 12 is absorbed, the air in the secondary air channel is discharged from the secondary air outlet 45, and the refrigerant flows back to the indirect evaporation end 12 under the action of the internal driving force to complete a cycle.
When the wet bulb temperature is higher or the wet bulb temperature is low but the dry-wet bulb temperature difference is smaller, the device starts a mixed cooling operation mode, the spray water pump 22 and the compressor 31 are started in the mixed cooling operation mode, and the cooling requirements are met by evaporative cooling and mechanical refrigeration together. The method comprises the following specific steps:
firstly, indoor air is guided to enter a primary air duct, the air entering the primary air duct flows to the indirect evaporation end 12 after being processed by the air filter 36, the indirect evaporation end 12 absorbs heat and cools the air, the cooled air flows to the evaporator 32 to be cooled for the second time, and then the air is discharged from the primary air outlet 44 under the action of the primary air fan 37. When the primary air duct works, outdoor air enters the secondary air duct from the secondary air inlet 42, and the air entering the secondary air duct exchanges heat with the indirect condensation end 11 after reaching the indirect condensation end 11. The air which takes away the heat of the indirect condensation end 11 flows to the condensation end, carries out secondary heat absorption on the condensation end, and then is discharged through a secondary air outlet 45 under the action of a secondary air fan 25. When the air entering the secondary air duct reaches the indirect condensation end 11, the spray water pump 22 starts to operate, conveys the water in the water collection tray 21 to the water distributor 24, sprays the water on the indirect condensation end 11 through the water distributor 24, and is contacted with the air in the secondary air duct to evaporate, so that the heat of the indirect condensation end 11 is absorbed, and the evaporated residual water falls back to the water collection tray 21 to complete one spray water circulation. The indirect evaporation end 12 and the indirect condensation end 11 are connected with each other to form a closed loop, and a refrigerant flows in the loop. After absorbing the heat of the air in the primary air duct, the indirect evaporation end 12 transfers the heat to the indirect condensation end 11 through the refrigerant, and the indirect condensation end 11 exchanges heat with the air and water in the secondary air duct. Finally, after the heat of the indirect condensation end 11 obtained by the indirect evaporation end 12 is absorbed, the air in the secondary air channel is discharged from the secondary air outlet 45, and the refrigerant flows back to the indirect evaporation end 12 under the action of the internal driving force to complete a cycle. The evaporator 32, the compressor 31, the condenser 33 and the throttle valve 34 form an air conditioning circuit known as a closed circuit, which is activated when the indirect evaporative cooling does not meet the required cooling capacity. Because the evaporator 32 is arranged at the downstream of the indirect evaporation end 12, the condenser 33 is arranged at the downstream of the indirect condensation end 11, and the indirect evaporation cooling carries out primary treatment on the air before mechanical refrigeration, the cooling device combining the mechanical refrigeration and the indirect evaporation cooling uses less electric energy in the mechanical refrigeration part compared with the common mechanical refrigeration air conditioner, and is more energy-saving and environment-friendly.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.
Claims (10)
1. An indirect evaporative cooling apparatus, comprising: the device comprises a shell, an air filter, an indirect evaporation end, a primary air fan, an indirect condensation end and a secondary air fan; a primary air inlet and a primary air outlet are formed in the side wall of one side of the shell, a secondary air inlet is formed in the side wall of the other side of the shell, and a secondary air outlet is formed in the top of the shell on the same side of the secondary air inlet; the air filter, the indirect condensation end, the primary air fan, the indirect evaporation end and the secondary air fan are positioned in the shell, wherein the primary air inlet, the air filter, the indirect evaporation end, the primary air fan and the primary air outlet are sequentially connected to form a primary air channel; the secondary air inlet, the indirect condensation end, the secondary air fan and the secondary air outlet are sequentially connected to form a secondary air duct; the indirect evaporation end and the indirect condensation end are connected to form a closed loop.
2. An indirect evaporative cooling apparatus as set forth in claim 1 further comprising: the water collecting tray, the spray water pump and the water distributor are sequentially connected through a water pipe, the water collecting tray is arranged below the indirect condensation end, the water distributor is arranged above the indirect condensation end, and a medium filter screen is arranged between the water collecting tray and the spray water pump.
3. An indirect evaporative cooling apparatus as set forth in claim 2 further comprising: the air conditioner comprises an evaporator, a compressor, a condenser and a throttle valve, wherein a primary air inlet, an air filter, an indirect evaporation end, the evaporator, a primary air fan and a primary air outlet are sequentially connected to form a primary air channel; the secondary air inlet, the indirect condensation end, the condenser, the secondary air fan and the secondary air outlet are sequentially connected to form a secondary air duct; the evaporator, the compressor, the condenser and the throttle valve are connected in sequence to form a closed loop.
4. An indirect evaporative cooling apparatus as set forth in claim 3 further comprising: the system comprises a dry-wet bulb temperature sensor and a mode switching device, wherein the dry-wet bulb temperature sensor is connected with the mode switching device, and the mode switching device is respectively connected with a spray water pump and a compressor.
5. An indirect evaporative cooling unit as claimed in claim 1 wherein the secondary air inlet is formed in a side wall of the other end of the housing opposite the primary air outlet, the side wall being formed on three sides of the bottom of the other end of the housing.
6. The indirect evaporative cooling device of claim 1, wherein the heat exchanger formed by connecting the indirect evaporation end and the indirect condensation end is an integral heat pipe heat exchanger.
7. A cooling method for a cooling apparatus according to any one of claims 1 to 6, characterized in that the method comprises:
cooling: the indoor air is guided to flow into the primary air channel from the primary air inlet, the indoor air is filtered by the filter and then flows through the indirect evaporation end to be cooled, and the cooled indoor air is discharged from the primary air outlet under the action of the primary air fan;
and (3) heat release step: conducting flow to outdoor air, enabling the outdoor air to enter a secondary air duct from a secondary air inlet, absorbing heat of the outdoor air through an indirect condensation end, and discharging the outdoor air after absorbing heat from a secondary air outlet under the action of a secondary air fan;
a flowing refrigerant is arranged between the indirect evaporation end and the indirect condensation end to carry out heat transfer; when the indoor air reaches the indirect evaporation end, the refrigerant absorbs heat and then flows to the indirect condensation end; when the outdoor air reaches the indirect condensation end, the refrigerant transfers heat to the outdoor air and then flows to the indirect evaporation end.
8. A cooling method according to claim 7, wherein said cooling means comprises: the water collecting tray, the spray water pump and the water distributor are sequentially connected through water pipes; the cooling method further comprises an evaporative cooling step: when the outdoor air reaches the indirect condensation end, the water distributor sprays water to the indirect condensation end.
9. A cooling method according to claim 8, wherein the cooling apparatus further comprises: the system comprises an evaporator, a compressor, a condenser and a throttle valve, wherein the evaporator, the compressor, the condenser and the throttle valve are sequentially connected to form a closed loop; the cooling method further comprises a mixing step:
when the indoor air flows through the indirect evaporation end to be cooled, the cooled indoor air enters the evaporator to be cooled again;
when the outdoor air flows through the indirect condensation end to absorb heat, the outdoor air after absorbing heat enters the condenser to absorb heat again.
10. A cooling method according to claim 8, wherein the cooling apparatus further comprises: the system comprises a dry-wet bulb temperature sensor and a mode switching device, wherein the dry-wet bulb temperature sensor is connected with the mode switching device, and the mode switching device is respectively connected with a spray water pump and a compressor; the cooling method further comprises the monitoring step of:
the dry-wet bulb temperature sensor monitors the temperature and the humidity of air, and the mode switching device judges whether to perform an evaporative cooling step and a mixing step according to a monitoring result.
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