Exhaust heat recovery and condensation heat recovery all-in-one machine

Abstract

The utility model relates to the technical field of heating ventilation air conditioners, in particular to an exhaust heat recovery and condensation heat recovery all-in-one machine. Comprising a condensation heat recovery part and an exhaust heat recovery part, the condensation heat recovery part and the exhaust heat recovery part are divided into an upper layer and a lower layer, and the upper layer and the lower layer are both installed on a base. The condensation heat recovery part comprises a fresh air opening, an access door, a filter screen, an evaporation coil pipe, a reheating coil pipe, an air feeder and an air supply opening; outdoor fresh air enters the fresh air opening, then sequentially passes through the filter screen, the evaporation coil and the reheating coil, and then is fed into a room through the air feeding opening by the air feeder. According to the utility model, unnecessary energy waste can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of HVAC technology, and more specifically to an integrated machine for exhaust heat recovery and condensation heat recovery. Background Technology

[0002] Currently, conventional variable frequency direct expansion combined air conditioning units consist of two parts: an indoor unit and an outdoor unit. The outdoor unit includes a compressor, outdoor heat exchange coils, expansion valves, etc., while the indoor unit includes the air intake section, filter section, heat exchange coil section, reheat section, and air supply section. Separating the indoor and outdoor units results in a large footprint, and connecting the indoor and outdoor units requires overcoming various site-specific challenges.

[0003] Reheating methods include hot water, steam, and electric heating. Hot water and steam heating are limited by the availability of hot water and steam resources, while electric heating consumes more power, resulting in greater energy consumption.

[0004] When the heat exchanger is located outdoors, the high outdoor temperature causes the condensation temperature to be too high, and the low outdoor temperature causes the evaporation temperature to be too low. If the return air at a suitable temperature is directly discharged into the surrounding environment, it easily leads to a significant waste of energy. Exhaust gas recovery can reduce unnecessary energy waste and has considerable potential for energy saving. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, this utility model provides an integrated machine for exhaust heat recovery and condensation heat recovery, which has the advantage of reducing unnecessary energy waste.

[0006] The technical solution adopted by this utility model to solve its technical problem is:

[0007] An integrated exhaust heat recovery and condensation heat recovery unit includes a condensation heat recovery section and an exhaust heat recovery section, wherein the condensation heat recovery section and the exhaust heat recovery section are divided into upper and lower layers, and both upper and lower layers are mounted on a base.

[0008] The condensation heat recovery section includes a fresh air inlet, an inspection door, a filter, an evaporator coil, a reheat coil, a blower, and an air outlet. The fresh air inlet is connected to the outside. After the outdoor fresh air enters the fresh air inlet, it passes through the filter, the evaporator coil, and the reheat coil in sequence, and is then delivered to the room by the blower through the air outlet.

[0009] The exhaust heat recovery section includes a return air inlet, an electrical control box, an inspection door, a filter, an exhaust-side condenser coil, a variable frequency compressor, an exhaust fan, and an exhaust outlet. The return air inlet connects to the indoor unit. After being purified by the filter, the return air passes through the condenser coil. The medium-low temperature air blows over the condenser, causing the high-temperature and high-pressure refrigerant gas to condense and release heat. The air passing through is heated and then sent to the outside by the exhaust fan through the exhaust outlet.

[0010] Inspection doors are provided at the fresh air inlet, evaporator coil, and air supply outlet, as well as at the filter and exhaust outlet.

[0011] An electrical control box is installed at the return air vent, which controls the start, operation and stop of the air conditioning unit. A variable frequency compressor is installed at the condenser coil, and the exhaust fan is a centrifugal fan.

[0012] The integrated exhaust heat recovery and condensation heat recovery system includes a fresh air side heat exchange coil, distributor, expansion valve, dryer filter, check valve, liquid receiver, copper filter, plate heat exchanger, exhaust side heat exchange coil, four-way reversing valve, gas-liquid separator and proportional regulating valve.

[0013] The exhaust-side heat exchange coil, variable frequency compressor, gas-liquid separator, four-way reversing valve, and plate heat exchanger are all located on the indoor side.

[0014] The fresh air side heat exchange coil, reheat coil, and exhaust air side heat exchange coil are circulated and connected through a liquid circulation pipeline; the exhaust air side heat exchange coil is used to recover the cold / heat of the return air; the reheat coil is used to transfer some of the condensed heat to the fresh air; a variable frequency compressor is used to adjust the frequency of the variable frequency motor; the variable frequency compressor is equipped with a gas injection port; the gas injection heat exchanger adopts a plate heat exchanger.

[0015] The variable frequency compressor operates by compressing the low-pressure, low-temperature gaseous refrigerant at the evaporator outlet into a high-pressure, high-temperature gaseous refrigerant, which is then divided into two paths: one path enters a four-way reversing valve, and the other path enters a reheat coil. The reheat power is adjusted by the proportional regulating valve on the pipeline from the variable frequency compressor to the reheat coil through the opening degree. The high-temperature, high-pressure refrigerant enters the exhaust-side heat exchange coil through the four-way reversing valve, where it is cooled by the return air drawn by the exhaust fan.

[0016] The high-pressure, high-temperature gaseous refrigerant enters the reheat coil and is cooled by the cold air supplied by the air conditioner; the reheat coil is used to recover the condensation heat of the refrigeration system.

[0017] The refrigerant cooled by the reheat coil and the exhaust side heat exchange coil flows to the plate heat exchanger through a one-way valve. The medium in each loop sequentially enters different gaps between plates and exchanges heat with adjacent plate areas. After passing through the plate heat exchanger, part of the refrigerant returns to the gas injection port of the variable frequency compressor, while another part enters the liquid receiver through a copper filter. Excess refrigerant that does not participate in the circulation needs to be stored in the liquid receiver. The refrigerant exiting the liquid receiver passes through a dryer filter to remove any possible moisture and impurities, ensuring the normal operation of the expansion valve.

[0018] Medium-temperature, high-pressure liquid refrigerant flows through the expansion valve, where it is throttled through a small orifice inside the valve body. This reduces the pressure and temperature, transforming it into a low-temperature, low-pressure refrigerant. The refrigerant then enters the fresh air-side heat exchange coil via the distributor, where it cools the air conditioning supply air. After passing through the fresh air-side heat exchange coil, the refrigerant passes through a copper filter and a four-way reversing valve, entering the gas-liquid separator. The gas-liquid separator is located before the compressor inlet, and the refrigerant then enters the variable frequency compressor to complete the cycle.

[0019] The beneficial effects of this utility model, an integrated exhaust heat recovery and condensation heat recovery unit, are:

[0020] This invention solves the problem of the outdoor and indoor units of the unit occupying a lot of space and being inconvenient to install, thus saving unit costs and improving unit performance.

[0021] This invention connects the inlet heat exchanger coil, reheat coil, and exhaust heat exchanger coil via a liquid circulation pipeline. Part of the condensation load is utilized through the condensation reheat coil to replace electric heating for reheat temperature regulation.

[0022] This invention solves the problem that hot water heating and steam heating are limited by the availability of hot water and steam resources, while electric heating consumes a lot of power, resulting in significant energy consumption.

[0023] This invention solves the problem of directly discharging appropriately sized return air into the surrounding environment, which easily leads to a large amount of energy waste. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific implementation methods.

[0025] Figure 1 This is a schematic diagram of a combined exhaust heat recovery and condensation heat recovery unit.

[0026] Figure 2 This is a schematic diagram of an integrated exhaust heat recovery and condensation heat recovery system.

[0027] In the diagram: 1. Evaporator coil; 2. Inspection door; 3. Exhaust fan; 4. Compressor; 5. Filter screen; 6. Electrical control box; 7. Return air vent; 8. Supply fan; 9. Supply air outlet; 10. Reheat coil; 11. Condensate coil; 12. Fresh air inlet; 13. Fresh air side heat exchange coil; 14. Distributor; 15. Expansion valve; 16. Dryer filter; 17. Check valve; 18. Liquid receiver; 19. Copper filter; 20. Plate heat exchanger; 21. Exhaust air side heat exchange coil; 22. Four-way reversing valve; 23. Gas-liquid separator; 24. Proportional regulating valve. Detailed Implementation

[0028] The technical solutions of the present invention will now be described with reference to the accompanying drawings in the embodiments of the present invention.

[0029] Reference Figure 1 As shown, this invention provides an integrated exhaust heat recovery and condensation heat recovery unit, including a condensation heat recovery section and an exhaust heat recovery section. The condensation heat recovery section and the exhaust heat recovery section are divided into upper and lower layers, and both upper and lower layers are installed on a base.

[0030] The condensation heat recovery section includes a fresh air inlet 12, an inspection door 2, a filter 5, an evaporator coil 1, a reheat coil 10, a blower 8, and an air outlet 9. The fresh air inlet 12 connects to the outside. Outdoor fresh air enters the inlet 12 and passes sequentially through the filter 5, evaporator coil 1, and reheat coil 10, before being delivered indoors by the blower 8 through the air outlet 9. The filter 5 purifies the incoming air, filtering out dust and other impurities. Following the filter 5 is the evaporator coil 1. In cooling mode, the fresh air passes through the evaporator coil 1, where it absorbs heat through the low-temperature, low-pressure refrigerant, thus cooling the air. The cooled air is then reheated by the reheat coil 10, reheating the fresh air according to the room temperature requirements to achieve constant temperature and humidity.

[0031] The exhaust heat recovery section includes a return air inlet 7, an electrical control box 6, an inspection door 2, a filter 5, an exhaust-side condenser coil 11, a variable frequency compressor 4, an exhaust fan 3, and an exhaust outlet. The return air inlet 7 is connected to the indoor unit. After being purified by the filter 5, the return air passes through the condenser coil 11. The medium-low temperature air blows over the condenser, causing the high-temperature and high-pressure refrigerant gas to condense and release heat. The air passing through is heated and then sent to the outside by the exhaust fan 3 through the exhaust outlet.

[0032] Inspection doors 2 are provided at the fresh air inlet 12, evaporator coil 1, and air supply outlet 9. Inspection doors 2 are also provided at the filter screen 5 and exhaust outlet.

[0033] The inspection door 2 at the fresh air inlet 12 can be used to replace and inspect the filter 5 after the fresh air section, ensuring that the filter 5 is intact and clean, and ensuring that the incoming air can pass through smoothly.

[0034] The maintenance door 2 following the evaporator coil 1 allows for the adjustment and maintenance of the expansion valve, ensuring the normal operation of the evaporator coil 1.

[0035] The maintenance door 2 at air outlet 9 allows for belt replacement, fan motor maintenance, and ensures normal air supply.

[0036] An electrical control box 6 is installed at the return air vent 7. The electrical control box 6 controls the start, operation and stop of the air conditioning unit. A variable frequency compressor 4 is installed at the condenser coil 11. The exhaust fan 3 is a centrifugal fan.

[0037] Reference Figure 2As shown, this invention provides an integrated exhaust heat recovery and condensation heat recovery system, including a fresh air side heat exchange coil 13, a distributor 14, an expansion valve 15, a dryer filter 16, a one-way valve 17, a liquid receiver 18, a copper filter 19, a plate heat exchanger 20, an exhaust side heat exchange coil 21, a four-way reversing valve 22, a gas-liquid separator 23, and a proportional regulating valve 24;

[0038] The exhaust side heat exchange coil 21, variable frequency compressor 4, gas-liquid separator 23, four-way reversing valve 22, and plate heat exchanger 20 are all installed on the indoor side.

[0039] The fresh air side heat exchange coil 13, reheat coil 10 and exhaust air side heat exchange coil 21 are circulated and connected through a liquid circulation pipeline; the exhaust air side heat exchange coil 21 is used to recover the cold / heat of the return air.

[0040] The reheat coil 10 is used to transfer some of the condensed heat to the fresh air;

[0041] The variable frequency compressor 4 is used to change the refrigerant circulation flow rate in the refrigeration system by adjusting the frequency of the variable frequency motor, thereby achieving stepless adjustment of the cooling capacity;

[0042] The variable frequency compressor 4 is equipped with a gas injection port. The refrigerant in the gas injection path is throttled by the gas injection expansion valve, then heat-exchanged by the plate heat exchanger, and finally enters the compressor gas injection port.

[0043] The gas-fueling heat exchanger uses a plate heat exchanger 20. The medium in each loop enters different gaps between plates in sequence and exchanges heat with adjacent plate areas.

[0044] In order for the fresh air side heat exchange coil 13 to have the ability to regulate heating and cooling, the variable frequency compressor 4 operates to compress the low-pressure, low-temperature gaseous refrigerant at the evaporator outlet into a high-pressure, high-temperature gaseous refrigerant, which is then divided into two paths. One path enters the four-way reversing valve 22, and the other path enters the reheat coil 10. At this time, the reheat coil 10 has the reheating capability. The reheating power is adjusted by the proportional regulating valve 24 on the pipeline from the variable frequency compressor 4 to the reheat coil 10 through the opening degree.

[0045] High-temperature and high-pressure refrigerant enters the exhaust-side heat exchange coil 21 through the four-way reversing valve 22. The high-pressure and high-temperature gaseous refrigerant is cooled by the return air drawn by the exhaust fan 3 in the exhaust-side heat exchange coil 21. Since the return air drawn from the room is lower than the outdoor temperature, the exhaust-side heat exchange coil 21 reduces the condensation temperature and improves the cooling efficiency by the cold air drawn by the exhaust fan 3.

[0046] After the high-pressure, high-temperature gaseous refrigerant enters the reheat coil 10, it is cooled by the cold air supplied by the air conditioner, which can reduce the condensing temperature. By using the reheat coil 10 to recover the condensing heat of the refrigeration system, on the one hand, the use of additional reheating, such as hot water reheating, steam reheating and electric reheating, can be avoided, and on the other hand, the condensing temperature is reduced, which improves the energy efficiency of the unit.

[0047] The refrigerant cooled by the reheat coil 10 and the exhaust side heat exchange coil 21 flows to the plate heat exchanger 20 through the one-way valve 17. The medium in each loop enters different gaps between plates and exchanges heat with adjacent plate areas in sequence.

[0048] After passing through the plate heat exchanger 20, part of the refrigerant returns to the gas injection port of the variable frequency compressor 4, and another part of the refrigerant enters the liquid receiver 18 through the copper filter 19. The excess refrigerant that does not participate in the circulation needs to be stored in the liquid receiver 18.

[0049] The refrigerant from the receiver 18 passes through the dryer filter 16 to remove any possible moisture and impurities, ensuring that the expansion valve 15 works properly.

[0050] Medium-temperature, high-pressure liquid refrigerant flows through expansion valve 15 and is throttled through small holes inside the valve body. The pressure and temperature decrease, and it becomes low-temperature, low-pressure refrigerant. It then enters the fresh air side heat exchange coil 13 through distributor 14 and cools the air conditioning supply air in the fresh air side heat exchange coil 13.

[0051] The refrigerant passing through the fresh air side heat exchange coil 13 passes through the copper filter 19 and the four-way reversing valve 22 and enters the gas-liquid separator 23. The gas-liquid separator 23 is located before the inlet of the compressor 4 and mainly functions to separate the refrigerant in the pipeline into gas and liquid, ensuring that the compressor 4 does not carry liquid when it draws in air, thus protecting the compressor 4. The refrigerant then enters the variable frequency compressor 4 to complete the cycle.

[0052] This novel integrated exhaust heat recovery and condensation heat recovery unit features a fresh air-side heat exchange coil 13, a reheat coil 10, and an exhaust-side heat exchange coil 21, all connected via a liquid circulation pipeline. This allows for simultaneous condensation heat recovery and exhaust heat recovery. While simultaneously cooling / heating the fresh and return air, this unit reduces system energy consumption and saves energy through exhaust heat recovery and condensation heat recovery. The combination of exhaust heat recovery and condensation heat recovery also reduces unit costs and improves unit performance.

Claims

1. An integrated exhaust heat recovery and condensation heat recovery unit, comprising a condensation heat recovery section and an exhaust heat recovery section, characterized in that: The condensation heat recovery section and the exhaust heat recovery section are divided into upper and lower layers, and both layers are installed on a base.

2. The integrated exhaust heat recovery and condensation heat recovery unit according to claim 1, characterized in that: The condensation heat recovery section includes a fresh air inlet (12), an inspection door (2), a filter (5), an evaporator coil (1), a reheat coil (10), a blower (8), and an air outlet (9). The fresh air inlet (12) is connected to the outside. After the outdoor fresh air enters the fresh air inlet (12), it passes through the filter (5), the evaporator coil (1), and the reheat coil (10) in sequence, and is then delivered to the room by the blower (8) through the air outlet (9).

3. The integrated exhaust heat recovery and condensation heat recovery unit according to claim 2, characterized in that: The exhaust heat recovery section includes a return air inlet (7), an electrical control box (6), an inspection door (2), a filter (5), an exhaust-side condenser coil (11), a variable frequency compressor (4), an exhaust fan (3), and an exhaust outlet. The return air inlet (7) is connected to the room. After the return air is purified by the filter (5), it passes through the condenser coil (11). The medium-low temperature air blows through the condenser, causing the high-temperature and high-pressure refrigerant gas to condense and release heat. The air passing through is heated and then sent to the outside by the exhaust fan (3) through the exhaust outlet.

4. The integrated exhaust heat recovery and condensation heat recovery unit according to claim 3, characterized in that: Inspection doors (2) are provided at the fresh air inlet (12), evaporator coil (1), and air supply outlet (9), and inspection doors (2) are provided at the filter screen (5) and exhaust outlet.

5. The integrated exhaust heat recovery and condensation heat recovery unit according to claim 3, characterized in that: An electrical control box (6) is installed at the return air vent (7). The electrical control box (6) controls the start, operation and stop of the air conditioning unit. A variable frequency compressor (4) is installed at the condenser coil (11). The exhaust fan (3) is a centrifugal fan.

6. The integrated exhaust heat recovery and condensation heat recovery unit according to claim 3, characterized in that: The exhaust heat recovery and condensation heat recovery integrated system includes a fresh air side heat exchange coil (13), a distributor (14), an expansion valve (15), a dryer filter (16), a one-way valve (17), a liquid receiver (18), a copper filter (19), a plate heat exchanger (20), an exhaust side heat exchange coil (21), a four-way reversing valve (22), a gas-liquid separator (23), and a proportional regulating valve (24). The exhaust side heat exchange coil (21), variable frequency compressor (4), gas-liquid separator (23), four-way reversing valve (22), and plate heat exchanger (20) are all installed on the indoor side; The fresh air side heat exchange coil (13), reheat coil (10) and exhaust air side heat exchange coil (21) are connected in a circulating manner through a liquid circulation pipeline; the exhaust air side heat exchange coil (21) is used to recover the cold / heat of the return air; the reheat coil (10) is used to transfer part of the condensed heat to the fresh air; a variable frequency compressor (4) is used to adjust the frequency of the variable frequency motor; the variable frequency compressor (4) is equipped with a gas injection port; the gas injection heat exchanger adopts a plate heat exchanger (20).

7. The integrated exhaust heat recovery and condensation heat recovery unit according to claim 6, characterized in that: The variable frequency compressor (4) operates, compressing the low-pressure, low-temperature gaseous refrigerant at the evaporator outlet into a high-pressure, high-temperature gaseous refrigerant, which is then divided into two paths. One path enters the four-way reversing valve (22), and the other path enters the reheat coil (10). The reheat power is adjusted by the proportional regulating valve (24) on the pipeline from the variable frequency compressor (4) to the reheat coil (10) through the opening degree. The high-temperature, high-pressure refrigerant enters the exhaust side heat exchange coil (21) through the four-way reversing valve (22). The high-pressure, high-temperature gaseous refrigerant is cooled by the return air drawn by the exhaust fan (3) in the exhaust side heat exchange coil (21).

8. The integrated exhaust heat recovery and condensation heat recovery unit according to claim 7, characterized in that: After the high-pressure, high-temperature gaseous refrigerant enters the reheat coil (10), it is cooled by the cold air supplied by the air conditioner; the reheat coil (10) is used to recover the condensation heat of the refrigeration system.

9. The integrated exhaust heat recovery and condensation heat recovery unit according to claim 8, characterized in that: The refrigerant cooled by the reheat coil (10) and the exhaust side heat exchange coil (21) flows to the plate heat exchanger (20) through the check valve (17). The medium of each loop enters different gaps between plates in sequence and exchanges heat with adjacent plate areas. After passing through the plate heat exchanger (20), part of the refrigerant returns to the gas injection port of the variable frequency compressor (4), and another part of the refrigerant enters the liquid receiver (18) through the copper filter (19). The excess refrigerant that does not participate in the circulation needs to be stored in the liquid receiver (18). The refrigerant coming out of the liquid receiver (18) passes through the dryer filter (16) to remove possible moisture and impurities, ensuring that the expansion valve (15) works normally.

10. The integrated exhaust heat recovery and condensation heat recovery unit according to claim 9, characterized in that: The medium-temperature, high-pressure liquid refrigerant flows through the expansion valve (15), and is throttled through the small hole inside the valve body. The pressure and temperature decrease, and it becomes a low-temperature, low-pressure refrigerant. It enters the fresh air side heat exchange coil (13) through the distributor (14) and cools the air conditioning supply air in the fresh air side heat exchange coil (13). The refrigerant passing through the fresh air side heat exchange coil (13) passes through the copper filter (19) and the four-way reversing valve (22) and enters the gas-liquid separator (23). The gas-liquid separator (23) is located before the compressor (4) inlet, and the refrigerant enters the variable frequency compressor (4) to complete the cycle.

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