Condensation heat and condensate water recovery fresh air handling unit

Abstract

The utility model discloses a condensation heat and condensate water recovery fresh air handling unit which comprises a fresh air machine box body, an air supply channel and an air exhaust channel which are mutually independent are arranged in the fresh air machine box body, and an evaporator, a reheater, a humidifier and an air feeder which are sequentially arranged in the direction from an air inlet to an air supply outlet are arranged in the air supply channel. A sprayer, a condenser and an exhaust fan are sequentially arranged in the exhaust channel in the direction from the return air inlet to the exhaust outlet. The evaporator, the reheater and the condenser are sequentially connected so as to achieve condensation heat recovery. A water storage tank connected with the humidifier and the sprayer and a condensate water recycling assembly connected with the water storage tank are arranged in the fresh air machine box body, and the condensate water recycling assembly can collect condensate water of the evaporator, the humidifier, the sprayer and the condenser into the water storage tank. Condensation heat recovery can be achieved through the condenser, condensate water recovery is achieved through the condensate water recovery assembly, and therefore energy consumption of the fresh air handling unit is reduced.

Description

Technical Field

[0001] This utility model relates to the field of fresh air handling equipment technology, and in particular to a fresh air handling unit that recovers condensing heat and condensate water. Background Technology

[0002] In building HVAC systems, the energy consumption of fresh air handling units accounts for a significant proportion of the overall energy consumption. During the summer, the high temperature and humidity of the outdoor fresh air generates a large amount of condensate during the cooling process. The conventional approach is to directly drain this condensate, but this wastes water resources and increases the energy consumption of the fresh air handling unit. Furthermore, the condenser in the fresh air handling unit requires sprayers to spray cold water as an auxiliary cooling method to improve the heat recovery effect, and the simultaneous operation of the sprayers and humidifiers consumes a considerable amount of water.

[0003] Therefore, it is necessary to provide a new air handling unit that can utilize low-temperature condensate to improve the condensation heat recovery effect and make full use of condensate to reduce energy consumption. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a fresh air handling unit that recovers condensation heat and condensate water. It achieves efficient recovery of condensation heat in the low-temperature exhaust air by setting up a condenser and a sprayer, and recovers condensate water by setting up a condensate water recovery component, thereby reducing energy consumption and water waste.

[0005] This utility model provides a fresh air handling unit for condensing heat and condensate recovery, including a fresh air handling unit housing. The fresh air handling unit housing has independent air supply channels and exhaust channels. The two ends of the air supply channel are respectively provided with an air inlet connected to the outside and an air supply outlet connected to the inside. The two ends of the exhaust channel are respectively provided with a return air outlet connected to the inside and an exhaust air outlet connected to the outside.

[0006] The air supply channel is provided with an evaporator, a reheater, a humidifier and a blower arranged sequentially from the air inlet to the air outlet;

[0007] The exhaust duct is equipped with a sprayer, a condenser and an exhaust fan arranged sequentially from the return air inlet to the exhaust air inlet;

[0008] The evaporator, the reheater, and the condenser are connected in sequence to achieve condensation heat recovery;

[0009] The fresh air unit housing is also equipped with a water storage tank connected to the humidifier and the sprayer respectively, and a condensate recovery assembly connected to the water storage tank. The condensate recovery assembly can collect the condensate from the evaporator, the humidifier, the sprayer and the condenser into the water storage tank respectively.

[0010] In one of the alternative technical solutions, the condensate recovery assembly includes a water collection tray and a recovery pipe connected to the water collection tray, with one of the water collection trays placed below the evaporator, the humidifier, the sprayer, and the condenser, respectively.

[0011] In one of the alternative technical solutions, each of the recycling pipes is connected to the water storage tank, and each of the recycling pipes is equipped with a condensate filtration and purification device.

[0012] In one of the alternative technical solutions, the sprayer and the condenser share a single water receiving tray.

[0013] In one of the alternative technical solutions, the evaporator, the reheater and the condenser are connected in sequence by a refrigerant pipeline, a compressor is provided on the refrigerant pipeline between the evaporator and the reheater, and an expansion valve is provided on the refrigerant pipeline between the condenser and the evaporator.

[0014] In one alternative embodiment, the evaporator is connected to the condenser via a bypass valve, bypassing the reheater.

[0015] In one of the alternative technical solutions, a first filter is provided in the air supply channel near the air inlet, and a second filter is provided in the exhaust channel near the return air outlet.

[0016] In one of the optional technical solutions, the water storage tank is provided with an inlet connected to the water inlet pipe, an outlet connected to the humidifier and the sprayer, a recovery port connected to the condensate recovery component, and a drain outlet connected to the drainage pipe. Switch valves are provided at the inlet and the outlet, and a water pump is provided at the outlet.

[0017] In one of the alternative technical solutions, an auxiliary humidification valve is provided between the water storage tank and the humidifier, and an auxiliary cooling valve is provided between the water storage tank and the sprayer.

[0018] In one of the alternative technical solutions, the upper side wall of the water storage tank is provided with an overflow port, which is connected to a drainage pipe.

[0019] The above technical solution has the following beneficial effects:

[0020] The condensing heat and condensate recovery fresh air unit provided by this utility model recovers the condensing heat in the exhaust air through the condenser, and then collects the condensate from the evaporator, humidifier, sprayer and condenser into the water storage tank by setting up a condensate recovery component, so as to realize the recovery of energy and resources. By recovering condensate and condensing heat, the overall energy consumption and water waste of the fresh air unit are reduced. Attached Figure Description

[0021] The disclosure of this utility model will become more readily understood by referring to the accompanying drawings. It should be understood that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings:

[0022] Figure 1 This is a schematic diagram of the structure of a fresh air handling unit for condensing heat and condensate recovery provided in an embodiment of the present invention.

[0023] Figure reference numerals:

[0024] 1. Fresh air unit casing; 11. Air inlet; 12. Air outlet; 13. Return air outlet; 14. Exhaust air outlet;

[0025] 2. Air supply duct; 21. Evaporator; 22. Reheater; 23. Humidifier; 24. Blower; 25. First filter;

[0026] 3. Exhaust duct; 31. Sprayer; 32. Condenser; 33. Exhaust fan; 34. Second filter;

[0027] 4. Condensate recovery assembly; 41. Recovery pipeline; 42. Water collection tray; 43. Condensate filtration and purification device;

[0028] 5. Water storage tank; 51. Compressor; 52. Expansion valve; 53. Water pump; 54. Auxiliary humidification valve; 55. Auxiliary cooling valve. Detailed Implementation

[0029] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. Identical components are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0030] In this utility model, unless otherwise explicitly specified and limited, the term "fixed" and similar terms should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part. It can mean a mechanical connection or an electrical connection. It can mean a direct connection or an indirect connection through an intermediate medium. It can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0031] like Figure 1As shown, a condensing heat and condensate recovery fresh air unit provided in an embodiment of the present invention includes a fresh air unit housing 1. The fresh air unit housing 1 is provided with an independent air supply channel 2 and an air exhaust channel 3. The two ends of the air supply channel 2 are respectively provided with an air inlet 11 connected to the outside and an air supply outlet 12 connected to the inside. The two ends of the exhaust channel 3 are respectively provided with a return air outlet 13 connected to the inside and an exhaust outlet 14 connected to the outside.

[0032] The air supply duct 2 is provided with an evaporator 21, a reheater 22, a humidifier 23 and a blower 24 arranged sequentially from the air inlet 11 to the air outlet 12.

[0033] The exhaust duct 3 is equipped with a sprayer 31, a condenser 32 and an exhaust fan 33 arranged sequentially from the return air inlet 13 to the exhaust air outlet 14.

[0034] Evaporator 21, reheater 22 and condenser 32 are connected in sequence to achieve condensation heat recovery.

[0035] The fresh air unit housing 1 is also equipped with a water storage tank 5 connected to the humidifier 23 and the sprayer 31 respectively, and a condensate recovery component 4 connected to the water storage tank 5. The condensate recovery component 4 can collect the condensate from the evaporator 21, the humidifier 23, the sprayer 31 and the condenser 32 into the water storage tank 5 respectively.

[0036] The fresh air unit housing 1 is made of a metal material with stable physical and chemical properties. Inside the fresh air unit housing 1, two adjacent and independent channels are formed, namely the air supply channel 2 and the exhaust channel 3. The air supply channel 2 and the exhaust channel 3 are connected to the indoor and outdoor areas respectively, so that the outdoor fresh air can enter the indoor area and the exhaust air can be discharged from the indoor area to the outdoor area.

[0037] In the air supply duct 2, when it is necessary to cool the fresh air from the outside, such as in summer, the low-temperature refrigerant exchanges heat with the air in the air supply duct 2 through the evaporator 21. In the evaporator 21, the liquid refrigerant is converted into a gaseous state, absorbing a large amount of heat during the refrigerant vaporization process, thus achieving the effect of cooling the air. When it is necessary to heat or humidify the fresh air from the outside, such as in winter, this is achieved through the reheater 22 and the humidifier 23 to ensure that the fresh air can meet the needs of the indoor environment.

[0038] In a fresh air handling unit, the evaporator 21 typically works in conjunction with the condenser 32, compressor 51, and expansion valve 52 to form a complete refrigeration cycle system. When fresh air passes through the evaporator 21, the heat in the air is absorbed by the refrigerant in the evaporator 21, thereby lowering the air temperature.

[0039] In the exhaust duct 3, the exhaust air requires less treatment than the fresh air. This utility model makes more reasonable use of space by placing the water storage tank 5 and the condenser 32 in the exhaust duct 3. In the process of cooling the refrigerant, the condenser 32 can use the condensation heat in the exhaust air to assist in the cooling. The recovery of condensation heat is actually to use the low temperature of the exhaust air to reduce the energy consumption required for cooling. The heat of the refrigerant in the condenser 32 is dissipated by the low temperature exhaust air, thus realizing the recovery of condensation heat.

[0040] The condensate recovery assembly 4 can recover condensate from components such as the evaporator 21 and condenser 32, which generate condensate on their outer walls during normal operation, and also recover water from components that actively spray water, such as the humidifier 23 and sprayer 31. The recovered condensate enters the water storage tank 5 for use by the humidifier 23 and sprayer 31, reducing water waste. Therefore, the condensate recovery assembly 4 includes at least a recovery component and a recovery pipe 41.

[0041] In summary, the condensation heat and condensate recovery fresh air handling unit provided by this invention recovers the condensation heat in the exhaust air through the condenser 32 in the exhaust duct 3, and further collects the condensate from the evaporator 21, humidifier 23, sprayer 31, and condenser 32 into the water storage tank 5 by setting up the condensate recovery component 4 inside, thereby realizing the recovery of energy and resources. Therefore, this invention reduces the overall energy consumption and water waste of the fresh air handling unit by recovering condensate and condensation heat, and can greatly reduce operating costs during long-term operation of the fresh air handling unit.

[0042] In one embodiment, the condensate recovery assembly 4 includes a water collection tray 42 and a recovery pipe 41 connected to the water collection tray 42. A water collection tray 42 is placed below the evaporator 21, the humidifier 23, the sprayer 31 and the condenser 32 respectively.

[0043] Furthermore, each recycling pipe 41 is connected to a water storage tank 5, and each recycling pipe 41 is equipped with a condensate filtration and purification device 43. The sprayer 31 and the condenser 32 share a water receiving tray 42.

[0044] In this embodiment, the size and structure of the water receiving tray 42 are matched with the components above it to ensure that the water receiving tray 42 can completely catch the flowing condensate. The water receiving tray 42 has at least one through hole in its center, allowing the condensate to enter the recovery pipe 41. To improve the condensate collection effect, the shape of the water receiving tray 42 can be set as a funnel, allowing the condensate to actively enter the recovery pipe 41 by its own weight, and then be filtered and purified by the condensate filtration and purification device 43 on the recovery pipe 41, so that the filtered condensate can smoothly enter the water storage tank 5, avoiding the accumulation of a large amount of condensate in the water receiving tray 42. Since the function of the sprayer 31 is to assist the condenser 32 in heat dissipation by spraying water onto the surface of the condenser 32, the distance between the sprayer 31 and the condenser 32 is relatively close. To reduce the number of water receiving trays 42 and recovery pipes 41, the sprayer 31 and the condenser 32 can share a larger water receiving tray 42 below them. Of course, other nearby components can also share the water receiving tray 42 as needed, which will not be elaborated further here.

[0045] In one embodiment, the evaporator 21, reheater 22 and condenser 32 are connected in sequence by refrigerant pipes. A compressor 51 is provided on the refrigerant pipe between the evaporator 21 and the reheater 22, and an expansion valve 52 is provided on the refrigerant pipe between the condenser 32 and the evaporator 21.

[0046] Furthermore, the evaporator 21 is connected to the condenser 32 via a bypass valve, bypassing the reheater 22.

[0047] In this embodiment, the evaporator 21, reheater 22 and condenser 32 are interconnected to form a refrigeration and heating system in which the refrigerant circulates in a closed loop. The refrigerant circulates and vaporizes in the pipeline, absorbing or releasing heat to change the temperature of the incoming fresh air to the target temperature and ensure the comfort of the fresh air.

[0048] In one embodiment, a first filter 25 is provided in the air supply channel 2 near the air inlet 11, and a second filter 34 is provided in the exhaust channel 3 near the return air inlet 13.

[0049] The first filter 25 filters outdoor air to ensure clean fresh air, while the second filter 34 filters exhaust air to ensure that the air discharged outdoors meets relevant regulations and avoids environmental pollution.

[0050] In one embodiment, the water storage tank 5 is provided with an inlet connected to the water inlet pipe, an outlet connected to the humidifier 23 and the sprayer 31, a recovery port connected to the condensate recovery assembly 4, and a drain outlet connected to the drainage pipe. Switch valves are provided at the inlet and outlet, and a water pump 53 is provided at the outlet.

[0051] Furthermore, an auxiliary humidification valve 54 is provided between the water storage tank 5 and the humidifier 23, and an auxiliary cooling valve 55 is provided between the water storage tank 5 and the sprayer 31. The auxiliary humidification valve 54 is generally opened in winter to start the humidifier 23 to humidify the dry fresh air, and the auxiliary cooling valve 55 is generally opened in summer to allow the sprayer 31 to actively spray water onto the surface of the condenser 32, thereby helping to improve the heat dissipation efficiency of the condenser 32.

[0052] Furthermore, the upper side wall of the water storage tank 5 is provided with an overflow port, which is connected to a drainage pipe. When there is too much water in the water storage tank 5 and the liquid level is higher than the overflow port, the excess water can flow out from the overflow port to the drainage pipe and be discharged, preventing the water storage tank 5 from being overfilled.

[0053] The water pump 53 can be started and stopped according to the outdoor air temperature and humidity. When the outdoor air temperature is low, to ensure sufficient pressure difference in the refrigeration cycle formed by the evaporator 21, condenser 32, and reheater 22, the temperature of the condenser 32 cannot be too low, and the water pump 53 can be turned off in this case. The water pump 53 can be turned on intermittently to ensure the utilization efficiency of condensate. If the water pump 53 is turned on continuously, the condensate may be discharged before it can evaporate. In addition, a liquid level switch can be installed on the water storage tank 5. When the liquid level is lower than the minimum value of the liquid level switch, the water pump 53 will turn off. The water storage tank 5 has at least two usage modes: storing condensate in summer and storing humidifying water in winter.

[0054] When cooling is needed in summer, the refrigerant flows as follows: Figure 1 As shown by the arrow, the refrigerant flows in the opposite direction to that in summer when heating is needed in winter.

[0055] In the summer fresh air handling process, the outdoor high-temperature and high-humidity fresh air is filtered by the first filter 25 and then cooled and dehumidified by the evaporator 21. To prevent the fresh air temperature from being too low and affecting indoor comfort, it can also be reheated by the reheater 22 to bring the fresh air to the target temperature, and then sent into the room from the air outlet 12 by the blower 24.

[0056] After the refrigerant cools and dehumidifies the fresh air in the evaporator 21, it enters the compressor 51 and is compressed into a high-pressure gas. Through the regulation of the bypass valve, part of the refrigerant enters the reheater 22 to reheat the low-temperature fresh air, and the other part enters the condenser 32 to utilize the waste heat of the exhaust air for cooling. After the refrigerant is cooled, it passes through the expansion valve 52 and enters the evaporator 21 to cool and dehumidify the fresh air, completing the refrigeration cycle.

[0057] In summer, indoor exhaust air is typically colder than the outside air. After being filtered by the second filter 34, the cold air is exchanged with the condenser 32, and then discharged outdoors by the exhaust fan 33. The condenser 32 dissipates heat using the cool exhaust air, thus achieving condensation heat recovery. Compared with plate heat recovery systems, condensation heat recovery via the condenser 32 has advantages such as higher recovery efficiency, no air leakage, and no ice blockage in winter.

[0058] After fresh air passes through the evaporator 21, condensate drips into the drip tray 42. The condensate is then filtered and purified by the condensate filtration and purification device 43 before entering the water storage tank 5. Water in the water storage tank 5 is discharged through the outlet and, driven by the water pump 53, supplied to the sprayer 31, allowing water to be evenly sprayed onto the surface of the condenser 32. This utilizes the evaporative heat exchange of the condensate to improve the heat dissipation efficiency of the condenser 32 and reduce the energy consumption of the refrigeration system. Excess dripping water on the condenser 32 is either discharged into the drip tray 42 or recycled back into the water storage tank 5.

[0059] In winter, the fresh air handling unit provides heating and humidification for the fresh air. The water storage tank 5 can be used as a water storage tank for humidification in winter, and condensation heat and condensate recovery are not performed at this time. At this time, the auxiliary cooling valve 55 is closed and the auxiliary humidification valve 54 is opened. The water in the water storage tank 5 is supplied to the humidifier 23 by the water pump 53, thereby humidifying the fresh air.

[0060] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0061] The above are merely the principles and preferred embodiments of this utility model. It should be noted that, for those skilled in the art, several other modifications can be made based on the principles of this utility model, and these modifications should also be considered within the scope of protection of this utility model.

Claims

1. A fresh air handling unit for condensing heat and condensate recovery, characterized in that, The system includes a fresh air unit housing (1), which has independent air supply channels (2) and exhaust channels (3). The air supply channels (2) have an air inlet (11) connected to the outside and an air outlet (12) connected to the inside at both ends. The exhaust channels (3) have a return air outlet (13) connected to the inside and an exhaust outlet (14) connected to the outside at both ends. The air supply channel (2) is provided with an evaporator (21), a reheater (22), a humidifier (23) and a blower (24) arranged sequentially from the air inlet (11) to the air outlet (12); The exhaust duct (3) is provided with a sprayer (31), a condenser (32) and an exhaust fan (33) arranged sequentially from the return air inlet (13) to the exhaust air outlet (14); The evaporator (21), the reheater (22) and the condenser (32) are connected in sequence to realize condensation heat recovery; The fresh air unit housing (1) is also provided with a water storage tank (5) connected to the humidifier (23) and the sprayer (31) respectively, and a condensate recovery assembly (4) connected to the water storage tank (5). The condensate recovery assembly (4) can collect the condensate from the evaporator (21), the humidifier (23), the sprayer (31) and the condenser (32) into the water storage tank (5) respectively.

2. The fresh air handling unit for condensing heat and condensate recovery according to claim 1, characterized in that, The condensate recovery assembly (4) includes a water receiving tray (42) and a recovery pipe (41) connected to the water receiving tray (42). A water receiving tray (42) is placed below the evaporator (21), the humidifier (23), the sprayer (31) and the condenser (32).

3. The fresh air handling unit for condensing heat and condensate recovery according to claim 2, characterized in that, Each of the recycling pipes (41) is connected to the water storage tank (5), and each of the recycling pipes (41) is equipped with a condensate filtration and purification device (43).

4. The fresh air handling unit for condensing heat and condensate recovery according to claim 2, characterized in that, The sprayer (31) and the condenser (32) share a water receiving tray (42).

5. The fresh air handling unit for condensing heat and condensate recovery according to claim 1, characterized in that, The evaporator (21), the reheater (22) and the condenser (32) are connected in sequence by refrigerant pipes. A compressor (51) is provided on the refrigerant pipe between the evaporator (21) and the reheater (22), and an expansion valve (52) is provided on the refrigerant pipe between the condenser (32) and the evaporator (21).

6. The fresh air handling unit for condensing heat and condensate recovery according to claim 5, characterized in that, The evaporator (21) is connected to the condenser (32) via a bypass valve, bypassing the reheater (22).

7. The fresh air handling unit for condensing heat and condensate recovery according to claim 1, characterized in that, A first filter (25) is provided in the air supply channel (2) near the air inlet (11), and a second filter (34) is provided in the exhaust channel (3) near the return air inlet (13).

8. The fresh air handling unit for condensing heat and condensate recovery according to claim 1, characterized in that, The water storage tank (5) is provided with an inlet connected to the water inlet pipe, an outlet connected to the humidifier (23) and the sprayer (31), a recovery port connected to the condensate recovery component (4) and a drain outlet connected to the drain pipe. The inlet and the drain outlet are respectively provided with switch valves, and the outlet is provided with a water pump (53).

9. The fresh air handling unit for condensing heat and condensate recovery according to claim 8, characterized in that, An auxiliary humidification valve (54) is provided between the water storage tank (5) and the humidifier (23), and an auxiliary cooling valve (55) is provided between the water storage tank (5) and the sprayer (31).

10. The fresh air handling unit for condensing heat and condensate recovery according to claim 8, characterized in that, The water storage tank (5) has an overflow port at the upper end of its side wall, and the overflow port is connected to the drainage pipe.

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