Evaporative cooling heat pump type heat recovery fresh air handling unit

Abstract

The application discloses a heat pump type heat recovery fresh air handling unit based on an evaporative condenser, which comprises a heat pump system for heat recovery, a fresh air system for providing outdoor air, an exhaust air system for discharging indoor air, and a water collecting and distributing system for recycling condensate water of fresh air. The application recovers condensate water of fresh air based on gravity and uses the condensate water as a water source for evaporative cooling of a heat pump condenser. The water collecting and distributing system comprises a multi-channel V-shaped condensate water pan, a check valve and a water distribution pipe. The multi-channel V-shaped condensate water pan can collect condensate water of fresh air, the check valve can ensure that the condensate water flows through and prevents exhaust air from mixing with fresh air, and the water distribution pipe is provided with water distribution holes with non-uniform diameters and is arranged in a vertical upward direction, so that water is uniformly distributed on the surface of the condenser. The application realizes evaporative condensation by using condensate water of fresh air, reduces condensing pressure and surface temperature of the condenser of the heat pump system, improves energy efficiency of the heat pump system, increases heat recovery efficiency of the unit, and reduces energy consumption of the air conditioning fresh air system.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of energy saving and environmental protection, and in particular relates to an energy-saving device for a fresh air system. BACKGROUND

[0002] Under the background of pursuing comfort and low carbonization in the field of architecture today, the energy-saving technology of air conditioning fresh air system is particularly crucial, which not only directly affects the indoor air quality and energy utilization efficiency, but also plays an important role in promoting green development in the field of architecture. The heat pump type heat recovery system is widely used in the field of fresh air heat recovery due to its full heat recovery and high energy-saving characteristics. In this system, indoor return air is used to cool the condenser to achieve the purpose of exhaust air energy recovery. In summer operation, condensation water is produced on the surface of the evaporator in the heat pump system, which has a lower temperature and contains a large amount of cold energy, and has a high utilization value.

[0003] Patent 202020175086.2 discloses a new type of air conditioning energy-saving cooling equipment, which can improve the utilization efficiency of energy. The use of condensation water to cool the cooling fins in this form makes full and effective use of low-temperature condensation water, thereby achieving energy saving. The equipment uses condensation water to cool the heat exchanger cooling fins, and the focus is on the design of the radiator structure, which does not involve the collection and uniform distribution of condensation water, and also does not involve its applicability in the field of fresh air heat recovery. SUMMARY

[0004] The application discloses an evaporative cooling type heat pump heat recovery fresh air unit, which uses the condensation water generated by the evaporator in the heat pump system to evaporatively cool the condenser, solves the technical problems of low cooling efficiency and insufficient cooling of the condenser, and further reduces the surface temperature and condensing pressure of the condenser. The reduction of the surface temperature of the condenser strengthens the condensation heat transfer of the refrigerant, thereby increasing the system heat recovery efficiency; the reduction of the condensing pressure reduces the pressure difference between the evaporator and the condenser, which can further reduce the power of the compressor and improve the system energy efficiency.

[0005] The application is realized by the following technical solutions:

[0006] The application discloses an evaporative cooling heat pump type heat recovery fresh air handling unit, which comprises a heat pump system, a fresh air system, an exhaust air system and a water collecting and distributing system. The heat pump system is provided with an evaporator, a condenser and a heat pump component placement area; the fresh air handling unit is provided with a fresh air inlet, a supply air outlet, a return air outlet and an exhaust air outlet around the fresh air handling unit; the fresh air system is provided with a filter I, a flow equalizing plate I and a supply fan; the exhaust air system is provided with a filter II, a flow equalizing plate II and an exhaust fan; the fresh air inlet and the exhaust air outlet are connected with outdoor air; the water collecting and distributing system is provided with a multi-channel V-shaped condensate pan, a check valve and a water distribution pipe; the fresh air inlet and the exhaust air outlet are connected with outdoor air; the supply air outlet is connected with indoor supply air; the return air outlet is connected with indoor return air; outdoor fresh air enters a supply air box through the fresh air inlet, sequentially passes through the filter I, the flow equalizing plate I and the evaporator, and is pushed to the supply air outlet by the supply fan, so that the fresh air flows into the indoor; indoor return air enters an exhaust air box through the return air outlet, sequentially passes through the filter II, the flow equalizing plate II and the condenser, and is pushed to the exhaust air outlet by the exhaust fan, so that the return air is discharged to the outdoor; the multi-channel V-shaped condensate pan is arranged below the evaporator; the bottom of the multi-channel V-shaped condensate pan is connected with the check valve; the end of the check valve is connected with the water distribution pipe; and the water distribution pipe is arranged above the condenser, so that the condensate formed on the surface of the evaporator flows to the condenser through the water distribution pipe.

[0007] Further, a multi-channel V-shaped condensate pan is arranged at the bottom of the evaporator, and is used for collecting the condensate generated on the surface of the evaporator.

[0008] Further, the check valve is arranged at the bottom of the multi-channel V-shaped condensate pan, so that the condensate flows through the check valve and the exhaust air and the fresh air are prevented from mixing.

[0009] Further, the check valve is arranged at the bottom of the multi-channel V-shaped condensate pan, so that the condensate flows through the check valve and the exhaust air and the fresh air are prevented from mixing.

[0010] Further, the check valve is arranged at the bottom of the multi-channel V-shaped condensate pan, so that the condensate flows through the check valve and the exhaust air and the fresh air are prevented from mixing.

[0011] Further, the check valve is arranged at the bottom of the multi-channel V-shaped condensate pan, so that the condensate flows through the check valve and the exhaust air and the fresh air are prevented from mixing.

[0012] Further, the heat pump component placement area is arranged with a compressor, a four-way reversing valve and an expansion valve and other heat pump components, and the heat pump component placement area is not communicated with the fresh air channel and the exhaust air channel.

[0013] Compared with the prior art, the application has the following beneficial effects:

[0014] The evaporative cooling heat pump type heat recovery fresh air unit of the present application can improve heat exchange efficiency: by utilizing the condensate water formed on the surface of the evaporator, the condensing pressure of the condenser can be effectively reduced, which in turn reduces the pressure difference between the evaporation and condensation processes, thereby reducing the energy consumption of the compressor. In addition, the temperature of the condenser surface is reduced, the heat exchange temperature difference is increased, and the performance of the condenser heat exchange is further improved.

[0015] The evaporative cooling heat pump type heat recovery fresh air unit of the present application adopts a gravity type condensate water collection and water distribution method, which does not require an additional power source, reduces the complexity of the system, improves the stability of the system, reduces the energy consumption of the system, and avoids waste of energy.

[0016] The evaporative cooling heat pump type heat recovery fresh air unit of the present application realizes the recovery of condensate water, and realizes efficient utilization of resources through waste heat utilization.

[0017] The evaporative cooling heat pump type heat recovery fresh air unit of the present application ensures the condensate water flow: a check valve is installed at the bottom of the multi-channel V-shaped condensate pan to avoid backflow of exhaust air to the fresh air tank and prevent the fresh air from being contaminated. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly set forth the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required when describing the embodiments. Obviously, the drawings described below only represent a group of preferred embodiments of the present application. Those skilled in the art can deduce other forms of drawings from these drawings without creative labor.

[0019] Figure 1 It is a front view of an evaporative cooling heat pump type heat recovery fresh air unit;

[0020] 1. Evaporator, 2. Condenser, 4. Fresh air outlet, 5. Filter I, 6. Flow equalizing plate I, 7. Air supply fan, 8. Air supply outlet, 9. Return air outlet, 10. Filter II, 11. Flow equalizing plate II, 12. Exhaust fan, 13. Exhaust air outlet, 14. Multi-channel V-shaped condensate pan, 15. Check valve, 16. Water distribution pipe.

[0021] Figure 2 It is a top view of an evaporative cooling heat pump type heat recovery fresh air unit;

[0022] 3. Heat pump assembly placement area, 17. Air outlet I, 18. Air duct, 19. Air outlet II.

[0023] Figure 3 It is a side view of an evaporative cooling heat pump type heat recovery fresh air unit;

[0024] 1. evaporator, 2. condenser, 14. multi-channel V-shaped water pan, 15. check valve, 16. water distribution pipe.

[0025] Figure 4 water distribution pipe layout;

[0026] 15. check valve, 16. water distribution pipe. DETAILED DESCRIPTION

[0027] The embodiments of the present application are described in detail below, which are implemented on the premise of the technical solutions of the present application, and detailed implementation modes and specific operation processes are given, but the protection scope of the present application is not limited to the following embodiments.

[0028] A schematic diagram of an evaporative cooling heat pump type heat recovery fresh air unit is shown in Figure 1 .

[0029] Referring to Figure 1 , an evaporative cooling heat pump type heat recovery fresh air unit includes a heat pump system, a fresh air system, an exhaust air system, and a water collecting and distributing system. The heat pump system is provided with an evaporator, a condenser, and a heat pump component placement area. The fresh air unit is provided with a fresh air inlet 4, a supply air inlet 8, a return air inlet 9, and an exhaust air outlet 13 around the unit. The fresh air system is provided with a filter I 5, a flow equalizing plate I 6, and a supply air fan 7. The exhaust air system is provided with a filter II 10, a flow equalizing plate II 11, and an exhaust air fan 12. The water collecting and distributing system includes a multi-channel V-shaped water pan 12, a check valve 13, and a water distribution pipe 14.

[0030] Further, the fresh air inlet 4 and the exhaust air outlet 13 are connected to the outside, the supply air inlet 8 is connected to the indoor supply air, and the return air inlet 9 is connected to the indoor return air. The outdoor fresh air enters the supply air box through the fresh air inlet 4, and then passes through the filter I 5, the flow equalizing plate I 6, the evaporator 1, and is sent to the indoor through the supply air fan 7 and the supply air inlet 8. The indoor return air enters the exhaust air box through the return air inlet 4, and then passes through the filter II 11, the flow equalizing plate II 9, and the condenser 11, and is sent to the outdoor through the exhaust air fan 12 and the exhaust air outlet 13. A multi-channel V-shaped water pan is arranged below the evaporator, the bottom of the multi-channel V-shaped water pan is connected with a check valve, the check valve is connected with a water distribution pipe, and the water distribution pipe is arranged above the condenser, so that the water generated on the surface of the evaporator can flow to the condenser through the water distribution pipe. The present application aims to reduce the condensing pressure of the condenser, and to reduce the surface temperature of the condenser and the return air temperature by introducing water in the multi-channel V-shaped water pan to perform the condensing process, thereby improving the heat exchange efficiency of the condenser.

[0031] A multi-channel V-shaped water pan is arranged below the evaporator to collect the condensed water generated on the evaporator.

[0032] The bottom of the multi-channel V-shaped water pan is connected with a check valve, which can ensure that the condensed water flows through and prevents the mixing of exhaust air and fresh air.

[0033] Referring toFigure 2 The heat pump assembly placement area 3 is arranged with the compressor, four-way reversing valve, expansion valve and other heat pump components, and the heat pump assembly placement area is not communicated with the fresh air channel and the exhaust air channel.

[0034] Referring to Figure 4 The check valve is connected with the water distribution pipe, and the diameters of the water distribution holes on the surface of the water distribution pipe are increased in sequence along the flow direction of the condensed water, so that the uniform distribution of the condensed water is ensured.

[0035] Figure 4 The water distribution pipe arrangement diagram is shown in FIG. 8, the opening direction of the water distribution pipe is vertically upward, and the condensed water flows to the surface of the condenser after flowing out of the water distribution hole, so that the condensed water cannot be discharged from the hole, and the uniform water distribution on the surface of the condenser is realized.

[0036] When working: during the system operation, fresh air is first introduced into the air supply box through the fresh air inlet. Here, the air flow passes through filter I to remove impurities, and the airflow distribution is uniformized through the flow distribution plate. Then, the airflow absorbs heat in the evaporator area and is then transported to the indoor. In this process, the gaseous water on the surface of the evaporator is condensed into liquid and collected in the multi-channel V-shaped condensate pan below. The condensed water then flows to the surface of the condenser through the check valve and the water distribution pipe to participate in the condenser heat exchange process. At the same time, the indoor return air enters the exhaust air box through the return air inlet, is filtered by filter II and uniformly distributed by flow distribution plate II, and cools the condenser with the uniformly distributed condensed water, thereby significantly improving the heat exchange efficiency of the condenser.

[0037] Obviously, the above-mentioned embodiments are only as an example to illustrate the present application, and do not constitute a limitation on the embodiments of the present application. Since the embodiments are numerous, it is impossible to list them one by one here. Any adjustment, equivalent replacement or optimization made under the guidance of the spirit and principles of the present application should be considered to fall within the scope of protection of the claims of the present application.

Claims

1. An evaporative cooling heat pump type heat recovery fresh air unit, comprising a heat pump system, a fresh air system, an exhaust system, and a water collection and distribution system, wherein the heat pump system is provided with an evaporator (1), a condenser (2), and a heat pump component placement area (3); the fresh air system is provided with a fresh air inlet (4), a filter I (5), a flow equalization plate I (6), a blower (7), and an air outlet (8); the exhaust system is provided with a return air inlet (9), a filter II (10), a flow equalization plate II (11), an exhaust fan (12), and an exhaust outlet (13); the water collection and distribution system is provided with a multi-channel V-shaped condensate tray (14), a check valve (15), and a water distribution pipe (16); characterized in that: The fresh air inlet (4) and the exhaust air outlet (13) are connected to outdoor air, the supply air outlet (8) is connected to indoor supply air, and the return air outlet (9) is connected to indoor return air. Outdoor fresh air enters the air supply box through the fresh air inlet (4), passes through filter I (5), flow equalization plate I (6), and evaporator (1) in sequence, and enters the air supply outlet (8) through the blower (7) to be delivered to the room. The indoor return air enters the exhaust box through the return air inlet (9), passes through filter II (10), flow equalization plate II (11), and condenser (2) in sequence, and is sent to the exhaust outlet (13) by the exhaust fan (12) and discharged to the outside; a multi-channel condensate tray (14) is arranged below the evaporator (1), and the bottom of the multi-channel V-shaped condensate tray is connected to a check valve (15). The check valve is connected to the water distribution pipe (16), and the water distribution pipe (16) is arranged above the condenser (2); A multi-channel V-shaped condensate tray (14) is arranged at the bottom of the evaporator (1), and the condensate on the surface of the evaporator is collected by the V-shaped condensate tray of each channel; A check valve (15) is connected to the bottom of the multi-channel V-shaped condensate pan (14); Check valves (15) are distributed at both ends of the multi-channel V-shaped condensate pan (14). The check valves (15) are connected to the water distribution pipe (16). Condensate flows through the multi-channel V-shaped condensate pan (14), check valves (15) and water distribution pipe (16) in sequence. The diameter of the water distribution holes on the surface of the water distribution pipe (16) increases sequentially along the direction of condensate flow; The opening direction of the water distribution hole on the water distribution pipe (16) is vertically upward, and the condensate flows out from the water distribution hole and flows to the surface of the condenser. The heat pump component placement area (3) is equipped with heat pump components such as compressor, four-way reversing valve and expansion valve. The heat pump component placement area (3) is not connected to the fresh air channel and the exhaust air channel.

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