Evaporative cooling type heat pump type heat recovery fresh air handling unit

Abstract

The invention discloses a heat pump type heat recovery fresh air handling unit based on an evaporative condenser. The heat pump type heat recovery fresh air handling unit comprises a heat pump system used for heat recovery, a fresh air system used for providing outdoor air, an exhaust system used for exhausting indoor air and a water collecting and distributing system used for recycling fresh air condensate. Fresh air condensed water is recycled based on gravity and serves as a water source for evaporative cooling of the heat pump condenser. The water collecting and distributing system comprises a multi-channel V-shaped water condensing disc, a check valve and a water distributing pipe; the multi-channel V-shaped water condensation disc can collect condensed water of fresh air, the check valve can ensure that the condensed water flows through and prevent exhaust air from being mixed with the fresh air, water distribution holes with non-uniform hole diameters are formed in the water distribution pipe, the hole opening direction is set to be vertically upward, and uniform water distribution on the surface of the condenser is achieved. Evaporation and condensation are achieved through fresh air condensation water, the condensation pressure and the surface temperature of a condenser of a heat pump system are reduced, the energy efficiency of the heat pump system is improved, the heat recovery efficiency of a unit is improved, and the energy consumption of an air conditioner fresh air system is reduced.

Description

Technical Field

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

[0002] In the context of the pursuit of comfort and low carbonization in today's construction field, the energy-saving technology of air conditioning fresh air system is particularly critical. It not only directly affects the indoor air quality and energy utilization efficiency, but also plays an important role in promoting green development in the construction field. 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 efficiency and energy saving. In this system, indoor return air is used to cool the condenser to achieve the purpose of exhaust air energy recovery. When operating in summer, condensed water is generated on the surface of the evaporator in the heat pump system. Its temperature is low and contains a large amount of cold, which has a high utilization value.

[0003] Patent 202020175086.2 discloses a new type of air-conditioning energy-saving heat dissipation equipment that can improve energy utilization efficiency. The form of cooling the heat sink with condensed water makes full and effective use of low-temperature condensed water, thereby achieving energy conservation. The equipment uses condensed water to cool the heat exchanger fins. The focus is on the design of the radiator structure, and does not involve the collection and uniform distribution of condensed water, nor does it involve its applicability in the field of fresh air heat recovery. Summary of the invention

[0004] The present invention discloses an evaporative cooling heat pump type heat recovery fresh air unit, which utilizes the condensed water generated by the evaporator in the heat pump system to perform evaporative cooling on the condenser, thereby solving the technical problems of low cooling efficiency and insufficient cooling of the condenser, and further reducing the surface temperature and condensation pressure of the condenser. The reduced surface temperature of the condenser strengthens the condensation heat exchange of the refrigerant, thereby increasing the heat recovery efficiency of the system; the reduced condensation pressure reduces the pressure difference between the evaporator and the condenser, which can further reduce the power of the compressor and improve the energy efficiency of the system.

[0005] The present invention is achieved through the following technical solutions: An evaporative cooling heat pump type heat recovery fresh air unit includes a heat pump system, a fresh air system, an exhaust system, and a water collection and distribution system. The heat pump system is respectively provided with an evaporator, a condenser and a heat pump component placement area; fresh air inlets, supply air inlets, return air inlets and exhaust air inlets are respectively provided around the fresh air unit, and the fresh air system is provided with a filter I, a flow equalizing plate I and a supply air fan; the exhaust system is provided with a filter II, a flow equalizing plate II and an exhaust air fan, and the fresh air inlet and the exhaust air inlet are connected to the outdoor air; the water collection and distribution system is provided with a multi-channel V-shaped condensate tray, a check valve and a water distribution pipe; the fresh air inlet and the exhaust air inlet are connected to the outdoor air, the supply air inlet is connected to the indoor supply air, and the return air inlet is connected to the indoor return air; the outdoor fresh air enters the supply air box through the fresh air inlet, and then Through filter I, flow plate I, and evaporator, the air supply fan pushes fresh air to the air supply port, and then flows into the room; the indoor return air enters the exhaust box through the return air port, passes through filter II, flow plate II, and condenser in sequence, and the exhaust fan pushes the exhaust air to the exhaust port, and then discharges it to the outside; a multi-channel V-shaped condensate tray is arranged below the evaporator, the bottom of the multi-channel V-shaped condensate tray is connected to the check valve, and the end of the check valve is connected to the water distribution pipe, which is arranged above the condenser, so that the condensed water formed on the surface of the evaporator flows to the condenser through the water distribution pipe. The present invention uses fresh air condensate to achieve evaporative condensation, reduces the condensation pressure and surface temperature of the condenser of the heat pump system, improves the energy efficiency of the heat pump system, increases the exhaust heat recovery efficiency of the unit, and reduces the energy consumption of the air conditioning fresh air system.

[0006] Furthermore, a multi-channel V-shaped condensation tray is arranged at the bottom of the evaporator to collect condensed water generated on the surface of the evaporator.

[0007] Furthermore, a check valve is installed at the bottom of the multi-channel V-shaped condensate tray to ensure that the condensate flows through while preventing the exhaust air from mixing with the fresh air.

[0008] Furthermore, the check valves are distributed at both ends of the multi-channel V-shaped condensate pan, the check valves are connected to the water distribution pipe, and the condensate flows through the multi-channel V-shaped condensate pan, the check valves and the water distribution pipe in sequence, and flows to the surface of the condenser below.

[0009] Furthermore, the outlet end of the check valve is connected to the water distribution pipe, and the diameter of the water distribution holes on the surface of the water distribution pipe increases successively along the flow direction of the condensed water. Such a structure ensures the uniform distribution of the condensed water.

[0010] Furthermore, the opening direction of the water distribution holes on the water distribution pipe is vertically upward, and the condensed water flows out of the water distribution holes and flows to the surface of the condenser.

[0011] Furthermore, heat pump components such as a compressor, a four-way reversing valve and an expansion valve are arranged in the heat pump component placement area, and the heat pump component placement area is not connected to the fresh air channel and the exhaust air channel.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The evaporative cooling heat pump type heat recovery fresh air unit of the present invention can improve the heat exchange efficiency: by utilizing the condensed water formed on the surface of the evaporator, the condensation 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 heat exchange performance of the condenser is further improved.

[0013] The evaporative cooling heat pump type heat recovery fresh air unit of the present invention adopts a gravity condensed water collection and distribution method, does not require an additional power source, reduces the complexity of the system, improves the stability of the system, and at the same time reduces the energy consumption of the system and avoids energy waste.

[0014] The evaporative cooling heat pump type heat recovery fresh air unit of the present invention realizes the recovery of condensed water and achieves efficient utilization of resources through the utilization of waste heat.

[0015] An evaporative cooling heat pump type heat recovery fresh air unit of the present invention ensures the unidirectional flow of condensed water: a check valve is installed at the bottom of the multi-channel V-shaped condensate tray to prevent exhaust air from flowing back to the fresh air box and prevent the fresh air from being polluted. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly explain the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below only represent a set of preferred embodiments of the present invention. For ordinary technicians in this technical field, other forms of drawings can be derived from these drawings without creative work.

[0017] Figure 1 This is a front view of an evaporative cooling heat pump type heat recovery fresh air unit; 1. Evaporator, 2. Condenser, 4. Fresh air inlet, 5. Filter I, 6. Flow equalizer I, 7. Supply air fan, 8. Supply air outlet, 9. Return air outlet, 10. Filter II, 11. Flow equalizer II, 12. Exhaust fan, 13. Exhaust outlet, 14. Multi-channel V-shaped condensate tray, 15. Check valve, 16. Water distribution pipe.

[0018] Figure 2 A top view of an evaporative cooling heat pump type heat recovery fresh air unit; 3. Heat pump component placement area, 17. Air outlet I, 18. Air duct, 19. Air outlet II.

[0019] Figure 3 It is a side view of an evaporative cooling heat pump type heat recovery fresh air unit; 1. Evaporator, 2. Condenser, 14. Multi-channel V-shaped condensate tray, 15. Check valve, 16. Water distribution pipe.

[0020] Figure 4 It is the layout diagram of water pipes; 15. Check valve, 16. Water distribution pipe. DETAILED DESCRIPTION

[0021] The following is a detailed description of an embodiment of the present invention. This embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation method and a specific operation process are given, but the protection scope of the present invention is not limited to the following embodiment.

[0022] A schematic diagram of an evaporative cooling heat pump type heat recovery fresh air unit is shown in Figure 1 .

[0023] See also Figure 1 An evaporative cooling heat pump type heat recovery fresh air unit includes a heat pump system, a fresh air system, an exhaust system, and a water collection and distribution system. The heat pump system is respectively provided with an evaporator, a condenser, and a heat pump component placement area; the fresh air unit is respectively provided with a fresh air inlet 4, an air supply inlet 8, a return air inlet 9, and an exhaust air inlet 13; the fresh air system is provided with a filter Ⅰ5, a flow equalizing plate Ⅰ6, and a supply fan 7; the exhaust system is provided with a filter Ⅱ10, a flow equalizing plate Ⅱ11, and an exhaust fan 12; the water collection and distribution system includes a multi-channel V-shaped condensate tray 12, a check valve 13, and a water distribution pipe 14.

[0024] Furthermore, the fresh air inlet 4 and the exhaust outlet 13 are connected to the outdoors, the air supply outlet 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 air supply box through the fresh air inlet 4, passes through the filter Ⅰ5, the flow equalizing plate Ⅰ6, the evaporator 1, and is sent to the air supply outlet 8 through the air supply fan 7 to be sent to the indoor room; the indoor return air enters the exhaust box through the return air inlet 4, passes through the filter Ⅱ11, the flow equalizing plate Ⅱ9, the condenser 11, and is sent to the air supply outlet 13 through the exhaust fan 12 to be sent to the outdoors; a multi-channel V-shaped condensation pan is arranged below the evaporator, and the bottom of the multi-channel V-shaped condensation pan is connected to a check valve, and the check valve is connected to 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 invention aims to reduce the condensation pressure of the condenser, and the condensation process is carried out by introducing water in the multi-channel V-shaped condensation pan, thereby reducing the surface temperature and return air temperature of the condenser, thereby improving the heat exchange efficiency of the condenser.

[0025] A multi-channel V-shaped condensate tray is arranged under the evaporator to collect the condensed water produced on the evaporator.

[0026] The bottom of the multi-channel V-shaped condensate tray is connected to a check valve to ensure that the condensate flows through and prevent the exhaust air from mixing with the fresh air.

[0027] See also Figure 2 The heat pump component placement area 3 is arranged with heat pump components such as a compressor, a four-way reversing valve and an expansion valve, and the heat pump component placement area is not connected to the fresh air channel and the exhaust air channel.

[0028] See also Figure 4 The check valve is connected to the water distribution pipe, and the diameter of the water distribution holes on the surface of the water distribution pipe increases successively along the flow direction of the condensed water. This structure ensures the uniform distribution of the condensed water.

[0029] Figure 4 This is the layout diagram of the water distribution pipes. The opening direction of the water distribution pipes is vertically upward. The condensed water flows out of the water distribution holes and flows to the surface of the condenser to avoid the condensed water being unable to be discharged from the holes, thereby achieving uniform water distribution on the condenser surface.

[0030] During operation: During the operation of the system, fresh air is first introduced into the air supply box through the fresh air inlet. Here, the air flows through filter I to remove impurities, and the air flow distribution is uniformed through the flow equalizer. Subsequently, the air flow absorbs heat in the evaporator area and is then transported to the room. During this process, the gaseous moisture on the surface of the evaporator condenses into liquid and gathers in the multi-channel V-shaped condensate tray below. The condensed water then flows to the surface of the condenser through the check valve and the water distribution pipe, participating in the heat exchange process of the condenser. At the same time, the indoor return air enters the exhaust box through the return air inlet, is filtered by filter II and evenly distributed by flow equalizer II, and cools the condenser together with the evenly distributed condensed water, thereby significantly improving the heat exchange efficiency of the condenser.

[0031] Obviously, the above-mentioned embodiments are only used as an example to illustrate the present invention and do not constitute a limitation on the embodiments of the present invention. Due to the numerous embodiments, it is impossible to list them one by one here. Any adjustment, equivalent replacement or optimization carried out under the guidance of the spirit and principles of the present invention shall be deemed to fall within the scope of protection of the claims of the present invention.

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 respectively provided with an evaporator (1), a condenser (2), and a heat pump component placement area (3); the fresh air system is respectively provided with a fresh air inlet (4), a filter I (5), a flow equalizing plate I (6), a blower (7), and an air supply outlet (8); the exhaust system is respectively provided with a return air inlet (9), a filter II (10), a flow equalizing plate II (11), an exhaust fan (12), and an exhaust outlet (13); the water collection and distribution system is respectively provided with a multi-channel V-shaped condensate tray (14), a check valve (15), and a water distribution pipe (16); the characteristics are as follows: The fresh air inlet (4) and the exhaust outlet (13) are connected to outdoor air, the supply air inlet (7) is connected to indoor supply air, and the return air inlet (9) is connected to indoor return air; the outdoor fresh air enters the air supply box through the fresh air inlet (4), passes through the filter I (5), the flow equalizing plate I (6), and the evaporator (1) in sequence, and enters the supply air inlet (8) through the air supply fan (7) and is delivered to the room; Indoor return air enters the exhaust box through the return air port (9), passes through the filter II (10), the flow equalizing plate II (11), and the condenser (2) in sequence, and is sent to the exhaust port (13) through the exhaust fan (12) and discharged to the outdoors; a multi-channel condensate pan (14) is arranged below the evaporator (1), and the bottom ends of the multi-channel V-shaped condensate pans are connected to check valves (15), and the check valves are connected to a water distribution pipe (16), and the water distribution pipe (16) is arranged above the condenser (2).

2. A water collection and distribution system according to claim 1, characterized in that: A multi-channel V-shaped condensation pan (14) is arranged at the bottom of the evaporator (1), and condensed water on the surface of the evaporator is collected by the condensation pans of each channel V-shaped structure.

3. A water collection and distribution system according to claim 1, characterized in that: A check valve (15) is connected to the bottom of the multi-channel V-shaped condensate tray.

4. A water collection and distribution system according to claim 1, characterized in that: The check valves (15) are distributed at both ends of the multi-channel V-shaped condensate tray. The check valves (15) are connected to the water distribution pipe (16). Condensate flows through the multi-channel V-shaped condensate tray (14), the check valves (15) and the water distribution pipe (16) in sequence.

5. A water collection and distribution system according to claim 1, characterized in that: The diameters of the water distribution holes on the surface of the water distribution pipe (16) increase sequentially along the flow direction of the condensed water.

6. A water collection and distribution system according to claim 1, characterized in that: The water distribution holes on the water distribution pipe (16) are opened vertically upward, and the condensed water flows out of the water distribution holes and flows to the surface of the condenser.

7. The evaporative cooling heat pump type heat recovery fresh air unit according to claim 1, characterized in that: The heat pump component placement area (3) is provided with heat pump components including a compressor, a four-way reversing valve and an 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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