CN205316557U - Two board double -cold -source intelligence fresh air unit - Google Patents

Abstract

The utility model relates to a double-plate double-cooling source intelligent fresh air unit, which includes a plate heat exchange unit, a heat pump circulation unit and a spray unit. The plate heat exchange unit includes a first plate heat exchanger and a second plate heat exchanger arranged side by side from left to right. Plate heat exchanger, heat pump circulation unit includes compressor, radiator condenser, reheat condenser, expansion valve and evaporator; spray unit includes spray device, sump, circulation pump; also includes surface cooler, outdoor fresh air in turn After passing through the air supply channel of the first plate heat exchanger, the air supply channel of the second plate heat exchanger, the surface cooler, the evaporator, and the reheating condenser, the passage to the room is provided with fresh air—the air supply channel; The wind passes through the return air passage of the second plate heat exchanger, the return air passage of the first plate heat exchanger, and the heat dissipation condenser in turn, and then discharges to the outside. A return air-exhaust air duct is provided. The utility model has the advantages of simple structure, complete functions, stable operation, low cost and high energy efficiency ratio, and can realize high-efficiency and low-energy-consumption operation throughout the year.

Description

A double plate double cold source intelligent fresh air unit

technical field

The invention relates to building energy-saving or air-conditioning equipment, in particular to a double-plate double-cooling-source fresh air unit that can operate with high efficiency and low energy consumption throughout the year.

Background technique

In the field of building energy saving and air conditioning, it is usually necessary to process fresh air to meet people's needs, that is, it is usually necessary to cool and dehumidify the outdoor air in summer, and it is usually necessary to heat and humidify the outdoor air in winter. The most commonly used refrigeration equipment in this field is mainly a heat pump, which is composed of compressors, evaporators, condensers, expansion valves and other components. During the cycle operation, the refrigerant is converted between the gaseous state and the liquid state through the compressor, expansion valve, etc. On the one hand, the refrigerant will release heat at the condenser, which will increase the temperature of the return air that exchanges heat with it. The heat is discharged through the return air; on the other hand, the refrigerant absorbs heat at the evaporator, which reduces the temperature of the fresh air that exchanges heat with it, thereby achieving the purpose of cooling and dehumidification.

However, in the current fresh air treatment system based on the heat pump, its reduction and dehumidification load are all borne by the refrigeration system, resulting in a low dehumidification capacity per unit electric energy of the overall unit. Based on this situation, those skilled in the art have researched and developed a fresh air dehumidifier with two systems, such as CN1699855, which is equipped with an evaporator, an air-cooled condenser, a compressor, a water-cooled condenser, a dry filter, an expansion valve, and a hot gas bypass. Valve, water baffle, fan, and a cooling coil in front of the evaporator, so that the cooling coil is connected in series with the water-cooled condenser to reduce the air handling range of the refrigeration system. Compared with the traditional fresh air treatment system, although the dehumidification capacity per unit of electric energy has been improved, it still has the problems of high energy consumption and low efficiency, which is not conducive to the sustainable development of energy.

Moreover, the current fresh air treatment system based on heat pumps generally has the defects of low energy efficiency ratio and single function, and is only suitable for one working condition in winter or summer, resulting in low utilization rate of the overall unit and poor utility.

Contents of the invention

The purpose of the present invention is to provide a double-plate double-cooling source intelligent fresh air unit, which has the advantages of simple structure, complete functions, stable operation, low cost and high energy efficiency ratio, and can realize high-efficiency and low-energy operation throughout the year.

In order to solve the technical problems of low heat recovery efficiency, high energy consumption, single function, low utilization rate and poor practicability of the traditional fresh air processing unit in the prior art, the present invention provides a double-plate double cold source intelligent fresh air unit, including A plate heat exchange unit, a heat pump circulation unit and a spray unit, wherein the plate heat exchange unit includes a first plate heat exchanger and a second plate heat exchanger arranged side by side from left to right, the first plate heat exchanger and the second plate heat exchanger are respectively provided with a horizontal air supply channel and a vertical return air channel, and the air supply channel and the return air channel are intersected; machine, radiator condenser, reheat condenser, expansion valve and evaporator; the spray unit includes a spray device and a water collection tank respectively arranged on the upper side and the lower side of the second plate heat exchanger, the spray device and the water collection tank The water tank is connected by a pipeline and a circulation pump is arranged on the pipeline; it also includes a surface cooler arranged on the right side of the second plate heater, and the liquid inlet and outlet of the surface cooler are connected to an external cold source or heat source connection;

The outdoor fresh air passes through the air supply channel of the first plate heat exchanger, the air supply channel of the second plate heat exchanger, the surface cooler, the evaporator, and the reheat condenser, and then reaches the indoor passage. ; The indoor return air passes through the return air passage of the second plate heat exchanger, the return air passage of the first plate heat exchanger, and the heat dissipation condenser, and then is discharged to the outdoor. Return air-exhaust air duct is provided.

Further, the present invention is an intelligent fresh air unit with double plates and double cooling sources, wherein, the fresh air——a blower fan is set in the air supply duct and between the evaporator and the reheating condenser; the return air - An exhaust fan is installed on the side of the exhaust air duct and at the inlet;

Further, the present invention is a double-plate double-cooling source intelligent fresh air unit, wherein, the fresh air—in the air supply duct and on the side at the inlet end is also provided with a fresh air pre-filter and a fresh air PM2.5 filter in sequence from left to right. Filter; the return air—the return air filter is also provided in the exhaust air duct and on the left side of the exhaust fan.

Further, the present invention is a double-plate double-cooling source intelligent fresh air unit, wherein, the lower side of the first plate heat exchanger and the second plate heat exchanger is also provided with fresh air—air supply bypass air duct; fresh air The fresh air between the PM2.5 filter and the first plate heat exchanger—the fresh air in the air supply duct and the fresh air—the left end of the supply air bypass air duct are respectively equipped with a first air valve and a second air valve, and the fresh air—— The air supply bypass air duct communicates with the fresh air through the second air valve—the left end of the air supply air duct and makes the fresh air PM2.5 filter on the left side of the second air valve; the fresh air—the air supply bypass air duct and the fresh air ——The right ends of the air supply ducts are connected to each other and the air supply fan is on the right side of the connection.

Further, the present invention is a double-plate double-cooling source intelligent fresh air unit, wherein, the upper side of the first plate heat exchanger and the second plate heat exchanger and the position in the middle of the two are also equipped with a device for controlling the return air. ——The third air valve of the exhaust air path, by opening the third air valve, the return air can be directly discharged outside through the return air filter, exhaust fan, third air valve and heat dissipation condenser.

Further, the present invention is a double-plate double-cooling source intelligent fresh air unit, wherein, the fresh air-air supply bypass air duct and the fresh air-air supply air duct are respectively provided with a fourth air valve and a fifth damper.

Further, the present invention is a double-plate double-cooling source intelligent fresh air unit, which also includes a coil heat exchanger, and the coil heat exchanger is located in the fresh air-air supply duct and is located at the end of the first plate heat exchanger. In the left position, when in use, the liquid inlet and outlet of the coil heat exchanger are connected to the external heat source through pipes.

Furthermore, the intelligent fresh air unit with double plates and double cooling sources of the present invention also includes an electrical control unit, which is used to control the power distribution and operating parameters of each component in the unit.

Further, the present invention is a double-plate double-cooler intelligent fresh air unit, wherein the plate-type heat exchange unit is provided with multiple sets.

Further, the present invention is a double-plate double-cooling source intelligent fresh air unit, wherein there are multiple surface coolers.

Compared with the prior art, a double-plate double-cooling source intelligent fresh air unit of the present invention has the following advantages: (1) The present invention makes the plate heat exchange unit include a plate heat exchange unit, a heat pump circulation unit and a spray unit The first plate heat exchanger and the second plate heat exchanger are arranged side by side from left to right. The first plate heat exchanger and the second plate heat exchanger are respectively equipped with horizontal air supply channels and vertical air return channels. channel, and the air supply channel and the return air channel are arranged crosswise; the heat pump circulation unit includes a compressor, a cooling condenser, a reheating condenser, an expansion valve and an evaporator which are connected end to end through pipelines; the spray unit includes The spraying device and the sump on the upper side and the lower side of the second plate heat exchanger are connected by a pipeline and a circulation pump is arranged on the pipeline; and a surface cooler is arranged so that the surface cooler is When in use, it is connected to an external cold source or heat source through a pipeline. At the same time, after the outdoor fresh air passes through the air supply channel of the first plate heat exchanger, the air supply channel of the second plate heat exchanger, the surface cooler, the evaporator, and the reheat condenser, the passage to the room is provided with fresh air——air supply Air duct: the indoor return air passes through the return air passage of the second plate heat exchanger, the return air passage of the first plate heat exchanger, and the passage outside the room after the cooling condenser is provided with a return air-exhaust air duct. This constitutes a double-plate double-cooling source fresh air unit. In practical applications, outdoor fresh air passes through the air supply channel of the first plate heat exchanger, the air supply channel of the second plate heat exchanger, the surface cooler, and the evaporator in sequence. , the process of reaching the room after the reheating condenser, and the process of the indoor return air passing through the return air channel of the second plate heat exchanger, the return air channel of the first plate heat exchanger, and the cooling condenser, and then discharged outdoors. The heat exchange between the first plate heat exchanger and the second plate heat exchanger realizes the efficient heat recovery of the system, which can effectively improve the performance of the unit, reduce energy consumption and improve the energy efficiency ratio. (2) When the latent heat load of the fresh air is large, water can also be sprayed into the return air channel of the second plate heat exchanger through the spray unit during operation, so that the return air can contact the water and perform total heat exchange, through Reduce the temperature of the return air to improve the heat exchange efficiency between the return air and the fresh air. At this time, the spray unit and the plate heat exchange unit form an indirect adiabatic evaporative cooling system, which can effectively improve the pretreatment capacity of the sensible heat of the fresh air. Since the return air and spray water realize full heat exchange in the plate heat exchange unit, the temperature of the return air is lowered to pre-cool the fresh air. Due to the increased heat exchange temperature difference, the heat exchange effect and efficiency are higher than those of the traditional heat recovery module. There is a great improvement. (3) As an optimization scheme, the present invention is provided with a blower fan at a position between the evaporator and the reheating condenser in the fresh air-air supply duct, and in the return air-exhaust air duct and at the inlet end. The exhaust fan is installed on the side, and the air intake can be effectively controlled by setting the air supply fan and the exhaust fan, thereby improving the controllability and stability of the system. At the same time, the present invention also arranges a fresh air pre-filter and a fresh air PM2.5 filter from left to right in the fresh air—the air supply air passage and on the side of the inlet end. There is also a return air filter on the left side of the fan. The fresh air can be roughly filtered through the fresh air pre-filter, and the fresh air can be finely filtered through the fresh air PM2.5 filter, which can effectively improve the quality of the air supply. The return air filter can realize the filtering treatment of the return air, and prevent the dust in the return air from entering the plate heat exchange unit and the spray unit, which will affect the heat exchange effect. (4) As a further optimization scheme, a fresh air-supply air bypass air duct is provided on the underside of the first plate heat exchanger and the second plate heat exchanger of the present invention, and the fresh air PM2.5 filter and the first plate heat exchanger The first air valve and the second air valve are respectively set at the left end of the fresh air-supply air duct and the fresh air-supply air bypass air duct between the heat exchangers, so that the fresh air-supply air bypass air duct passes through the first air valve. The second air valve is connected with the left end of the fresh air-supply air duct; the fresh air-supply bypass air duct and the fresh air-supply air duct are connected to the right end or the fourth air valve and the fifth air valve are respectively set at the connection. damper. At the same time, on the upper side of the first plate heat exchanger and the second plate heat exchanger and in the middle of the two, a third air valve for controlling the return air-exhaust air passage is set. By opening the third air valve, the The return air is directly discharged outside through the return air filter, exhaust fan, third air valve and heat dissipation condenser. After setting the above structure, by controlling the first air valve, the second air valve and the third air valve, the precise control of the fresh air supply passage and the return air exhaust passage can be realized, so that the system can adapt to spring and autumn seasons, In summer and winter, different operating conditions need to expand the scope of application and improve the utilization rate of the unit. On this basis, by controlling the opening and closing of the heat pump unit and the surface cooler, the energy consumption can be further reduced and the practicability can be enhanced.

A double-plate double-cooling source intelligent fresh air unit of the present invention will be further described in detail below in conjunction with the specific implementation shown in the accompanying drawings:

Description of drawings

Fig. 1 is a structural schematic diagram of the first embodiment of a double-plate double-cooling source intelligent fresh air unit of the present invention;

Fig. 2 is a schematic structural diagram of a second embodiment of a double-plate double-cooling source intelligent fresh air unit of the present invention.

detailed description

As shown in FIG. 1 , a schematic diagram of a first embodiment of a double-plate double-cooling source intelligent fresh air unit of the present invention includes a plate heat exchange unit, a heat pump circulation unit and a spray unit. The plate heat exchange unit includes a first plate heat exchanger 1 and a second plate heat exchanger 2 arranged side by side from left to right, the first plate heat exchanger 1 and the second plate heat exchanger 2 are respectively equipped with transverse The air supply channel and the vertical air return channel are provided, and the air supply channel and the return air channel are arranged crosswise. The heat pump cycle unit includes a compressor 3 , a radiator condenser 4 , a reheat condenser 5 , an expansion valve 6 and an evaporator 7 connected end to end through pipelines in sequence. The spraying unit includes a spraying device 8 and a sump 9 respectively arranged on the upper side and the lower side of the second plate heat exchanger 2 , the spraying device 8 and the sump 9 are connected by pipelines and a circulating pump 10 is arranged on the pipelines. And the surface cooler 11 is arranged on the right side of the second plate heater 2, and the liquid inlet and the liquid outlet of the surface cooler 11 are connected with an external cold source or heat source through pipelines to provide cooling or heat when in use.

And after the outdoor fresh air passes through the air supply channel of the first plate heat exchanger 1, the air supply channel of the second plate heat exchanger 2, the surface cooler 11, the evaporator 7, and the reheat condenser 5, it is provided on the passage to the room. There is fresh air—the supply air duct. The indoor return air passes through the return air channel of the second plate heat exchanger 2, the return air channel of the first plate heat exchanger 1, and the heat dissipation condenser 4 in turn, and then is discharged to the outdoor. .

After setting the above structure, in the practical application, the outdoor fresh air passes through the air supply channel of the first plate heat exchanger 1, the air supply channel of the second plate heat exchanger 2, the surface cooler 11, the evaporator 7, the reheating condensing The process of reaching the room after the heat exchanger 5, and the process of the indoor return air passing through the return air channel of the second plate heat exchanger 2, the return air channel of the first plate heat exchanger 1, and the heat dissipation condenser 4 in sequence, and then discharged outside. The first plate heat exchanger 1 and the second plate heat exchanger 2 have sufficient heat exchange at the air supply channel and return air channel, realizing efficient heat recovery of the system, which can effectively improve the performance of the unit and reduce energy consumption. When the latent heat load of the fresh air is large, water can also be sprayed into the return air channel of the second plate heat exchanger 2 through the spray unit during operation, so that the return air can contact the water and perform total heat exchange. The temperature of the wind is used to improve the heat exchange efficiency between the return air and the fresh air. At this time, the spray unit and the plate heat exchange unit form an indirect adiabatic evaporative cooling system, which can effectively improve the pretreatment capacity of the sensible heat of the fresh air. Since the return air and spray water realize full heat exchange in the plate heat exchange unit, the return air temperature is lowered to pre-cool the fresh air, and the heat exchange temperature difference is increased. The heat exchange effect and efficiency are higher than those of the traditional heat recovery module. There is a great improvement.

As an optimization method, in this specific embodiment, a blower fan 12 is set in the fresh air—in the air supply duct and between the evaporator 7 and the reheating condenser 5; in the return air—in the exhaust air duct and An exhaust fan 13 is arranged on the side of the inlet end. By setting the air supply fan 12 and the exhaust fan 13, the air intake volume can be effectively controlled, thereby improving the controllability and stability of the system. In the fresh air—in the air supply duct and on the side of the inlet end, a fresh air pre-filter 14 and a fresh air PM2.5 filter 15 are arranged in turn from left to right; in the return air—in the exhaust air duct and in the exhaust fan The left side of 13 is also provided with return air filter 16. The coarse filtration of fresh air can be realized through the fresh air pre-filter 14, the fine filtration of fresh air can be realized through the fresh air PM2.5 filter 15, and the quality of the air supply can be effectively improved, and the return air can be filtered through the return air filter , to prevent the dust of the return air from entering the plate heat exchange unit and the spray unit, which will affect the heat exchange effect.

As a further optimization scheme, in this specific embodiment, a fresh air—air supply bypass air duct is provided on the lower side of the first plate heat exchanger 1 and the second plate heat exchanger 2 . And in the fresh air between the fresh air PM2.5 filter 15 and the first plate heat exchanger 1—in the fresh air—in the air supply duct and at the left end of the fresh air—the air supply bypass air duct, the first air valve 17 and the second air valve 17 are respectively set. The valve 18 allows the fresh air-air supply bypass air channel to communicate with the left end of the fresh air-air supply air channel through the second air valve 18, and makes the fresh air PM2.5 filter 15 at the left side of the second air valve 18 ; And make the fresh air—the air supply bypass air duct and the fresh air—the right end of the air supply air duct communicate with each other, and make the air supply fan 12 be on the right side of the connection. At the same time, on the upper side of the first plate heat exchanger 1 and the second plate heat exchanger 2 and in the middle of the two, a third air valve 19 for controlling the return air-exhaust air passage is set, by opening the third The damper 19 can allow the return air to be discharged outdoors directly through the return air filter 16, the exhaust fan 13, the third damper 19 and the cooling condenser 4. After setting the above structure, by controlling the first air valve 17, the second air valve 18 and the third air valve 19, the precise control of the fresh air supply passage and the return air exhaust passage can be realized, so that the system can adapt to the In spring and autumn, summer and winter, different working conditions are required to expand the application range and improve the utilization rate of the unit. On this basis, by controlling the opening and closing of the heat pump unit and the surface cooler, the energy consumption can be further reduced and the practicability can be enhanced. .

As shown in Figure 2, it is a schematic diagram of the second embodiment of a double-plate double-cooling source intelligent fresh air unit of the present invention. The difference from the first embodiment is that in the second embodiment, the fresh air-supply air bypass Air duct and fresh air—the right end connection of the air supply air duct also adds a fourth damper 20 and a fifth damper 21 respectively. It should be noted that although the fourth air valve 20 and the fifth air valve 21 are not necessary for realizing the object of the present invention, the convenience and accuracy of the control can be further improved by the fourth air valve 20 and the fifth air valve 21 . At the same time, the second embodiment is also provided with a coil heat exchanger 22 , so that the coil heat exchanger 22 is located in the fresh air—air supply duct and is located on the left side of the first plate heat exchanger 1 . In winter conditions, the liquid inlet and outlet of the coil heat exchanger 22 are connected to an external heat source through pipes. The fresh air can be heated through the coil heat exchanger 22, so as to avoid the hidden danger of frosting and enhance the practicality.

It should be noted that a double-plate double-cooling source intelligent fresh air unit of the present invention also includes an electrical control unit, through which the power distribution and operating parameters of each component in the unit are managed and controlled, so as to improve the degree of automation and work efficiency. Moreover, the plate heat exchange unit and the surface cooler 11 are all or provided with multiples, so as to meet the fresh air treatment in different regions or working conditions.

In order to help those skilled in the art understand the present invention, the operation process of the second embodiment of a double-plate double-cooling source intelligent fresh air unit of the present invention will be briefly described below. Run under working conditions:

Working conditions in spring and autumn:

Under this kind of working condition, the fresh air only needs to be filtered, and does not need to be dehumidified and dehumidified. At this time, close the first damper 17 and the fourth damper 20, and open the second damper 18, the fifth damper 21 and the third damper. Air valve 19, the outdoor fresh air enters through the fresh air outlet, and after being filtered by the fresh air pre-filter 14, it is determined whether the fresh air PM2.5 filter 15 is needed for filtering according to the PM2. indoor. The indoor return air is directly discharged outside through the exhaust fan 13 through the third air valve 19. Under this working condition, the plate heat exchange unit, heat pump unit, spray unit, surface cooler, and coil heat exchanger are not working, and the air supply and exhaust air resistance are greatly reduced through the bypass air duct, and the air supply fan 12 The operation power of exhaust fan 13 also reduces thereupon, has realized the fresh air supply of ultra-low energy consumption.

Summer conditions:

In this working condition, the first damper 17 and the fourth damper 20 are opened, and the second damper 18 , the fifth damper 21 and the third damper 19 are closed. The outdoor fresh air enters through the fresh air outlet, and after being filtered by the fresh air pre-filter 14, it is checked according to PM2.5 to determine whether the fresh air PM2.5 filter 15 is required for filtering treatment, and then heat exchange with the indoor return air through the plate heat exchange unit , when the latent heat load of the fresh air is large, the spray unit is started. At this time, the spray unit and the plate heat exchange unit form an indirect adiabatic evaporative cooling system, which greatly enhances the pretreatment ability of the sensible heat of the fresh air. After the system is heated, it can be reduced to 21, and then it can be processed to 16 by the surface cooler 11, and then processed to 11 by the evaporator 7, and finally sent to the room after being heated by the reheat condenser 5. The return air and the spray water realize total heat exchange in the plate heat exchange unit, and the reduction of the return air temperature is mainly used for pre-cooling the fresh air. Due to the increase of the heat exchange temperature difference between the two, the heat exchange effect of the conventional heat recovery module is higher than that of the conventional heat recovery module. Better and more efficient.

Winter conditions:

In this working condition, the first damper 17 and the fourth damper 20 are opened, and the second damper 18 , the fifth damper 21 and the third damper 19 are closed. The working medium flow direction of the heat pump unit is converted through the four-way switching valve (not shown in the figure), and hot water is sprayed through the spray unit, and an external heat source is introduced into the surface cooler to achieve the purpose of heating. The fresh air can be preheated through the coil heat exchanger 22 to avoid frosting.

The above examples are only descriptions of the preferred embodiments of the present invention, and are not intended to limit the scope of protection claimed by the present invention. Under the premise of not departing from the design spirit of the present invention, engineers and technicians in the field made according to the technical solution of the present invention Variations in various forms should fall within the scope of protection defined by the claims of the present invention.

Claims (10)

1. A double-plate double-cooling source intelligent fresh air unit, including a plate heat exchange unit, a heat pump circulation unit and a spray unit, characterized in that: the plate heat exchange unit includes a first plate heat exchange unit arranged side by side from left to right The heat exchanger (1) and the second plate heat exchanger (2), the first plate heat exchanger (1) and the second plate heat exchanger (2) are respectively provided with horizontal air supply channels and vertical return channels. Air passage, and the air supply passage and the return air passage are arranged crosswise; the heat pump circulation unit includes a compressor (3), a cooling condenser (4), a reheating condenser (5), and an expansion valve connected end to end through pipelines in sequence (6) and evaporator (7); the spray unit includes a spray device (8) and a sump (9) which are respectively arranged on the upper side and the lower side of the second plate heat exchanger (2), and the spray device (8) and sump (9) are connected by pipeline and are provided with circulation pump (10) on the pipeline; Also include the surface cooler (11) that is arranged on the right side of the second plate heater (2), let the surface cooler (11) when in use The liquid inlet and liquid outlet of cooler (11) are connected with external cold source or heat source through pipeline; Outdoor fresh air sequentially passes through the air supply channel of the first plate heat exchanger (1), the air supply channel of the second plate heat exchanger (2), the surface cooler (11), the evaporator (7), the reheat condenser (5 ) to the indoor passage is provided with fresh air—air supply duct; the indoor return air passes through the return air passage of the second plate heat exchanger (2), the return air passage of the first plate heat exchanger (1), and the heat dissipation A return air-exhaust air duct is provided on the passage discharged from the back of the condenser (4). 2. According to claim 1, a double-plate double-cooling source intelligent fresh air unit is characterized in that: said fresh air—is in the air supply duct and is between the evaporator (7) and the reheat condenser (5) The position of air supply fan (12) is provided with; Described return air-in the exhaust air channel and the side that is at the entrance end is provided with exhaust fan (13); 3. According to claim 2, a double-plate dual-cooling source intelligent fresh air unit is characterized in that: said fresh air—in the air supply duct and at the side of the inlet end, there are also fresh air pre-filters sequentially from left to right device (14) and fresh air PM2.5 filter (15); described return air-in the exhaust air duct and also be provided with return air filter (16) on the left side of exhaust blower fan (13). 4. The intelligent fresh air unit with double plates and double cooling sources according to claim 3, characterized in that: the lower sides of the first plate heat exchanger (1) and the second plate heat exchanger (2) are also provided with There is fresh air—in the air supply bypass air channel; in the fresh air—in the air supply air channel and between the fresh air PM2.5 filter (15) and the first plate heat exchanger (1)—in the fresh air—in the air supply bypass air channel The left end of the left end is provided with the first air valve (17) and the second air valve (18) respectively, and the fresh air—the air supply bypass air duct communicates with the left end of the fresh air—the air supply air duct through the second air valve (18) and The fresh air PM2.5 filter (15) is on the left side of the second air valve (18); the fresh air—the air supply bypass air channel and the fresh air—the right end of the air supply air channel communicate with each other and make the air supply fan (12 ) is on the right side of the connection. 5. A double-plate double-cooling source intelligent fresh air unit according to claim 4, characterized in that: the upper side of the first plate heat exchanger (1) and the second plate heat exchanger (2) are located The position in the middle of the two is also provided with a third air valve (19) for controlling the return air-exhaust air passage, by opening the third air valve (19) to allow the return air to directly pass through the return air filter (16), exhaust Blower blower (13), the 3rd damper (19) and radiator condenser (4) are discharged outdoors. 6. According to claim 4, a double-plate double-cooling source intelligent fresh air unit is characterized in that: the fresh air-supply air bypass duct and the fresh air-supply air duct are connected at the right end of the fresh air duct. Four air valves (20) and the fifth air valve (21). 7. A double-plate double-cooling source intelligent fresh air unit according to any one of claims 1-6, characterized in that: it also includes a coil heat exchanger (22), and the coil heat exchanger (22) In the fresh air—in the air supply duct and on the left side of the first plate heat exchanger (1), when in use, the liquid inlet and liquid outlet of the coil heat exchanger (22) are connected to the external heat source through pipes . 8. A double-plate double-cooling source intelligent fresh air unit according to any one of claims 1-6, characterized in that: it also includes an electrical control unit, and the electrical control unit is used to control the power distribution of each component in the unit. Electrical and operating parameters are controlled. 9. A double-plate double-cooler intelligent fresh air unit according to any one of claims 1-6, characterized in that: the plate heat exchange unit is provided with multiple sets. 10. A double-plate double-cooler intelligent fresh air unit according to any one of claims 1-6, characterized in that there are multiple surface coolers (11).