CN212179166U - Air handling unit with exhaust energy recovery function and adjustable working condition variable channels - Google Patents
Air handling unit with exhaust energy recovery function and adjustable working condition variable channels Download PDFInfo
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- CN212179166U CN212179166U CN202020481537.5U CN202020481537U CN212179166U CN 212179166 U CN212179166 U CN 212179166U CN 202020481537 U CN202020481537 U CN 202020481537U CN 212179166 U CN212179166 U CN 212179166U
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The flat epidemic combined adjustable working condition variable channel air handling unit with exhaust air energy recovery belongs to the field of energy utilization technology and air conditioning, and comprises an air feeder (3), an air return machine (4), an evaporator a (1), an evaporator b (2), an energy recoverer (5), an air return valve (6), an exhaust valve (7), a fresh air valve (8), a bypass air valve a (9), a bypass air valve b (10) and a bypass air valve c (11). In normal refrigeration operation, the return air valve (6), the exhaust air valve (7) and the fresh air valve (8) are opened, fresh air subjected to energy recovery and return air are mixed and then pass through the evaporator a (1) and the evaporator b (2), and the two evaporators are arranged in parallel relative to air flow; when the epidemic situation comes, the return air valve (6) is closed, the exhaust air valve (7) and the fresh air valve (8) are opened, the fresh air sequentially passes through the evaporator a (1) and the evaporator b (2), and the two evaporators are arranged in series relative to the air flow.
Description
Technical Field
The invention relates to an air handling unit, in particular to a flatly ventilating and variable working condition channel air handling unit with exhaust energy recovery.
Background
2019-2020 novel COVID-19 coronavirus pneumonia which occurs globally makes us aware of the possibility that a central air-conditioning air handling unit plays a role in promoting virus propagation; the central air conditioning air processing unit can not only perform energy-saving operation in most of the normal time, but also avoid being a channel for virus propagation when an epidemic situation comes. In consideration of energy conservation and air quality, most of civil building air conditioning systems in China adopt a new air return mixed mode, and as most of air circulates indoors, infectious viruses have the opportunity to be transmitted indoors and harm public health and safety; generally consider to adopt the operation mode of full new trend under the epidemic situation emergence condition, can dilute indoor harmful substance and discharge outdoors, obviously improve indoor air quality. On one hand, the exhausted air is directly exhausted outdoors, and the cold energy is wasted; on the other hand, the operation under the full fresh air working condition greatly increases the energy consumption of fresh air treatment, and the energy consumption under the fresh air working condition with the same air volume is more than one time of the energy consumption under the air return working condition; at present, no air treatment unit which can adapt to the corresponding change of heat and humidity treatment under two working conditions under the condition of switching between a mixed air mode and a full fresh air mode exists in the world. But also has the following disadvantages: secondly, the air is cooled and dehumidified only in an evaporation mode, the ratio of sensible heat and latent heat absorbed by the air can only change within a certain range, and the heat-humidity ratio actually required by a building changes within a larger range, so that the phenomenon that the indoor relative humidity is too high or too low is caused; and thirdly, due to the existence of a large amount of condensed water in the air conditioning unit, a hotbed for breeding various moulds is formed on the surface of the coil pipe, the indoor air quality is deteriorated, and various sick building syndromes are caused.
This tie epidemic that area exhaust energy was retrieved combines variable passageway air handling unit of adjustable operating mode, its basic function does: because the indoor air state is low-temperature and low-humidity air, the air is directly discharged outdoors to cause energy waste, and a large amount of energy is consumed for processing the fresh air with high temperature and high humidity, and energy recovery of the indoor low-temperature and low-humidity exhaust becomes necessary; in the normal refrigeration state, in consideration of energy conservation and air quality, the fresh air and the return air are generally subjected to heat and humidity treatment after being mixed, the mixing ratio of the fresh air and the return air is generally about 20 percent, the indoor air exhaust requirement and the indoor positive pressure are simultaneously considered, the fresh air quantity is slightly larger than the air exhaust quantity, the designed ventilation frequency is larger, the fresh air subjected to energy recovery and the indoor return air are subjected to heat and humidity treatment simultaneously after being mixed, and then are sent into a room, and the two evaporators are arranged in parallel relative to air flow; when an epidemic situation comes, the return valve air is closed, the fresh air valve and the exhaust valve are simultaneously and completely opened to carry out full fresh air operation, the heat and humidity load of the fresh air working condition is much larger than that of the return air working condition in summer, the full fresh air volume design of the unidirectional flow system is smaller than that of the return air working condition, the rotating speed of the air feeder is adjusted by the frequency converter to be reduced to the proper air volume, the rotating speed of the return air fan is also adjusted by the frequency converter to be reduced to the proper exhaust volume, and the indoor specified positive pressure value is guaranteed; because the fresh air volume and the exhaust air volume are both larger, the energy exchange of the fresh air becomes necessary, at the moment, the outdoor fresh air and the indoor exhaust air are subjected to energy exchange and then enter the two evaporators in sequence, and then are sent into the room after being subjected to heat-moisture treatment by the two evaporators, and the two evaporators are arranged in series relative to the air flow.
Aiming at different requirements on energy conservation and air quality during normal times and epidemic situations, the air handling unit can be used for precooling fresh air while recovering energy of low-temperature low-humidity exhaust air by combining different loads of return air and fresh air, and achieves the effects of regulating air volume and meeting the requirement of handling fresh air with large enthalpy difference by regulating air volume and changing an air operation channel; when the epidemic situation occurs, the virus is prevented from being transmitted through an air conditioner, and the requirement of indoor temperature and humidity is met.
Disclosure of Invention
The invention aims to provide the air handling unit which has a simple and reasonable structure, can adjust the operation condition by changing the air flow channel and the air quantity, is suitable for multi-condition operation in different periods with epidemic situations at ordinary times, has low energy consumption, and can operate by combining the adjustable working condition and the variable channel, so as to overcome the defects in the prior art.
The variable-working-condition variable-channel air treatment unit with the exhaust air energy recovery function is divided into an air treatment part and an air return part and comprises a blower (3), a return air fan (4), two evaporators, an energy recoverer (5), a return air valve (6), an exhaust valve (7), a fresh air valve (8) and three bypass air valves.
The air handling unit with the exhaust energy recovery function and the adjustable working condition variable channel is characterized in that an air handling part comprises a blower (3), an evaporator a (1), an evaporator b (2), an evaporation part of an energy recoverer (5), an air return valve (6), a fresh air valve (8), a bypass air valve a (9), a bypass air valve b (10) and a bypass air valve c (11); the air return part comprises a return fan (4), an exhaust valve (7) and a condensation part of an energy recoverer (5); the evaporator a (1) and the evaporator b (2) of the air treatment part are both surface type heat exchangers of air-water or air-refrigerant; the evaporator b (2) and the evaporator a (1) are arranged in the air handling unit in a front-back staggered manner, and the lower part of the evaporator a (1) is connected with the upper part of the evaporator b (2) through a bypass air valve b (10); the lower part of the evaporator a (1) is also connected with another bypass air valve c (11), and the upper part of the evaporator b (10) is also connected with another bypass air valve a (9); an evaporation part of the energy recoverer (5) is arranged behind the fresh air valve (8) along the direction of a fresh air flow inlet; the evaporation part of the energy recoverer (5), a return air valve (6), an evaporator a (1) and a bypass air valve c (11) form a mixing section, and the return air valve (6) regulates the amount of return air from the bypass of the return air part to the air treatment part; the blower (3) sends the air after heat and humidity treatment to the room at the downwind side of the evaporator b (2) and the bypass air valve a (9), and the air treatment part and the return air part can be provided with an initial medium-efficiency or high-efficiency filter and a sterilization device in consideration of the high quality requirement of some items on the air.
When in refrigeration operation at ordinary times, the bypass air valve a (9) and the bypass air valve c (11) are opened, the bypass air valve b (10) is closed, the evaporator a (1), the bypass air valve b (10) and the bypass air valve a (9) are combined into an air processing channel 1, the evaporator b (2), the bypass air valve b (10) and the bypass air valve c (11) are combined into another air processing channel 2, return air passing through the return air valve (6) is mixed with fresh air sequentially passing through the fresh air valve (8) and the evaporation part of the energy recoverer (5), and then simultaneously passes through the evaporator a (1) and the evaporator b (2) of the channel 1, the evaporator a (1) and the evaporator b (2) are arranged in parallel relative to air flow, the mixed air is subjected to heat and humidity processing simultaneously by the two evaporators, and the cold energy of the evaporators can be adjusted by the opening degree of the proportional integral electric water valve or the opening number of the compressor through sensing the indoor temperature and humidity; when an epidemic situation occurs, the return valve air (6) is closed, the exhaust valve (7) and the fresh air valve (8) are simultaneously and completely opened, the evaporator a (1), the bypass air valve c (11), the evaporator b (2) and the bypass air valve a (9) are combined into the air processing channel 3, fresh air which sequentially passes through the fresh air valve (8) and the energy recoverer (5) evaporation part sequentially passes through the evaporator a (1) and the evaporator b (2) in the channel 3, the evaporator a (1) and the evaporator b (2) are arranged in series relative to air flow, and the fresh air sequentially passes through the evaporator a (1) and the evaporator b (2) for heat and humidity processing, so that the enthalpy difference of the air processed by the evaporator is increased, and the cold energy of the evaporator can be adjusted by the opening degree of a proportional integral electric water valve or the opening number of a compressor through an induction air outlet unit or indoor temperature and humidity; the evaporation part and the condensation part of the energy recoverer (5) are two independent channels, so that the possibility of cross infection of fresh air and exhaust air is avoided.
The invention aims at different requirements on energy saving and air quality during normal times and epidemic situations, combines the conditions of different loads of return air and fresh air, achieves the effects of adjusting the air quantity and meeting the requirement of treating the fresh air with large enthalpy difference by adjusting the air quantity and changing the air operation channel, and particularly prevents viruses from passing through channels for air conditioning and meets the requirement of indoor temperature and humidity during the occurrence of the epidemic situations.
Drawings
Fig. 1 is a schematic view illustrating an operation of ordinary cooling operation according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of the operation of the present invention when an epidemic occurs.
In the figure, (1) an evaporator a, (2) an evaporator b, (3) a blower, (4) a return fan, (5) an energy recoverer, (6) an air return valve, (7) an exhaust valve, (8) a fresh air valve, (9) a bypass air valve a, (10) a bypass air valve b, and (11) a bypass air valve c.
Detailed Description
The invention is further described with reference to the following figures and examples.
Referring to fig. 1 and 2, the air handling unit with the exhaust energy recovery function and the adjustable working condition variable channel is divided into an air handling part and an air return part; the air treatment part comprises a blower (3), an evaporator a (1), an evaporator b (2), an evaporation part of an energy recoverer (5), an air return valve (6), a fresh air valve (8), a bypass air valve a (9), a bypass air valve b (10) and a bypass air valve c (11); the air return part comprises a return fan (4), an exhaust valve (7) and a condensation part of an energy recoverer (5); the evaporator a (1) and the evaporator b (2) of the air treatment part are both surface type heat exchangers of air-water or air-refrigerant; the evaporator b (2) and the evaporator a (1) are arranged in the air handling unit in a front-back staggered manner, and the lower part of the evaporator a (1) is connected with the upper part of the evaporator b (2) through a bypass air valve b (10); the lower part of the evaporator a (1) is also connected with another bypass air valve c (11), and the upper part of the evaporator b (10) is also connected with another bypass air valve a (9); an evaporation part of the energy recoverer (5) is arranged behind the fresh air valve (8) along the direction of a fresh air flow inlet; the evaporation part of the energy recoverer (5), a return air valve (6), an evaporator a (1) and a bypass air valve c (11) form a mixing section, and the return air valve (6) regulates the amount of return air from the bypass of the return air part to the air treatment part; the blower (3) is arranged at the downwind side of the evaporator b (2) and the bypass air valve a (9) and sends the air subjected to heat and humidity treatment into the room; the return air fan (4) is arranged at the inlet of the return air part, the return air valve (6) and the condensing part of the energy recoverer (5) are arranged at the positive pressure section of the outlet of the return air fan (4), one part of return air is bypassed to the air processing part through the return air valve (6), and the other part of return air quantity sequentially passes through the condensing part of the energy recoverer (5) and the outdoor part which is exhausted after the exhaust valve (7); the air return valve (6), the fresh air valve (8) and the exhaust valve (7) can be proportionally adjusted in air quantity and opened and closed by an electric air valve actuator, and the air return fan (4) and the air feeder (3) can be adjusted in air quantity by frequency converters.
The working principle is as follows:
first, normal refrigeration operation
Referring to fig. 1, because the indoor air is low-temperature and low-humidity air, energy is wasted when the air is directly discharged outdoors, and a large amount of energy is consumed for processing fresh air with high temperature and high humidity, energy recovery is essential for discharging the indoor low-temperature and low-humidity air; in the normal refrigeration state, in consideration of energy conservation and air quality, fresh air and return air are mixed for heat and humidity treatment, the mixing ratio of the fresh air to the return air is about 20 percent generally, and meanwhile, in consideration of indoor air exhaust and indoor positive pressure maintenance, the fresh air quantity is slightly larger than the air exhaust quantity; at the moment, the return air valve (6) is completely opened, the exhaust valve (7) and the fresh air valve (8) are opened, the return air fan (4) operates, most return air returns to the air processing part through the return air valve (6) and is mixed with fresh air sequentially passing through the fresh air valve (8) and the evaporation part of the energy recoverer (5), a small part of return air is discharged outdoors sequentially passing through the condensation part of the energy recoverer (5) and the exhaust valve (7), and the evaporation part and the condensation part of the energy recoverer (5) respectively recover energy of the fresh air and the exhaust air; at the moment, the bypass air valve a (9) and the bypass air valve c (11) are opened, the bypass air valve b (10) is closed, the evaporator a (1), the bypass air valve b (10) and the bypass air valve a (9) are combined into an air processing channel 1, the evaporator b (2), the bypass air valve b (10) and the bypass air valve c (11) are combined into another air processing channel 2, the mixed air after the return air passing through the return air valve (6) is mixed with the fresh air sequentially passing through the fresh air valve (8) and the evaporation part of the energy recoverer (5) passes through the evaporator a (1) of the channel 1 and the evaporator b (2) of the channel 2 for heat and humidity processing, the evaporator a (1) and the evaporator b (2) are arranged in parallel relative to the air flow, and the cold quantity of the evaporator can be adjusted by the opening degree of the proportional integral electric water valve or the opening number of the compressor through sensing the indoor temperature and humidity.
Secondly, the epidemic situation occurs when the group operates
Referring to fig. 2, in order to prevent virus propagation, the air handling unit needs to operate with full fresh air, because the heat and humidity load of the fresh air working condition in summer is much larger than that of the return air working condition, the positive pressure value of a room cannot be too large, the functions of air exhaust and heat recovery are more necessary, the rotating speed of the air feeder is adjusted by the frequency converter to be reduced to proper air volume, the rotating speed of the return air fan is also adjusted by the frequency converter to be reduced to proper air exhaust volume, and the indoor specified positive pressure value is guaranteed to be; at the moment, the return air valve (6) is closed, the exhaust valve (7) and the fresh air valve (8) are simultaneously and completely opened, the return air fan (4) is adjusted by a frequency converter to reduce the air volume to operate, and all the return air is exhausted outdoors through the condensation part of the energy recoverer (5) and the exhaust valve (7); the bypass air valve a (9) and the bypass air valve c (11) are closed, the bypass air valve b (10) is opened, the evaporator a (1), the bypass air valve c (11), the evaporator b (2) and the bypass air valve a (9) are combined into an air processing channel 3, the air supply blower (3) is adjusted by a frequency converter to reduce air volume to operate, fresh air sequentially passes through a fresh air valve (8) and an evaporation part of an energy recoverer (5) and then sequentially passes through the evaporator a (1) and the evaporator b (2) in the channel 3 to carry out heat and humidity processing, the evaporator a (1) and the evaporator b (2) are arranged in series relative to air flow, therefore, the unit enthalpy difference of the air treated by the evaporator is increased, the evaporator is more suitable for treating fresh air heat and humidity loads, and the cold quantity of the evaporator can be adjusted by the opening of a proportional-integral electric water valve or the opening number of a compressor through sensing the air outlet of an air treatment unit or the indoor temperature and humidity; the evaporation part and the condensation part of the energy recoverer (5) respectively recover energy of fresh air and exhaust air, and the evaporation part and the condensation part of the energy recoverer (5) are two independent channels, so that the possibility of cross infection of the fresh air and the exhaust air is avoided.
Claims (4)
1. The air handling unit with the exhaust energy recovery function and the adjustable working condition variable channel is characterized by comprising an air handling part and an air return part, and comprises a blower (3), an air return machine (4), an evaporator a (1), an evaporator b (2), an energy recoverer (5), an air return valve (6), an exhaust valve (7), a fresh air valve (8), a bypass air valve a (9), a bypass air valve b (10) and a bypass air valve c (11).
2. The tie epidemic prevention combined adjustable working condition variable channel air handling unit with exhaust energy recovery of claim 1, characterized in that: the air treatment part comprises a blower (3), an evaporator a (1), an evaporator b (2), an evaporation part of an energy recoverer (5), an air return valve (6), a fresh air valve (8), a bypass air valve a (9), a bypass air valve b (10) and a bypass air valve c (11), wherein the evaporator a (1) and the evaporator b (2) are surface heat exchangers of air-water or air-refrigerant, the evaporator b (2) and the evaporator a (1) are arranged in a staggered mode in the front and back of the air treatment part, the lower part of the evaporator a (1) is connected with the upper part of the evaporator b (2) through the bypass air valve b (10), the lower part of the evaporator a (1) is further connected with the bypass air valve c (11), and the upper part of the evaporator b (2) is further connected with the other bypass air valve a (9); an evaporation part of an energy recoverer (5) is arranged behind a fresh air valve (8) along the direction of a fresh air flow inlet, the evaporation part of the energy recoverer (5) and an air return valve (6), an evaporator a (1) and a bypass air valve c (11) form a mixing section, and the air return valve (6) is used for adjusting the amount of return air from a return air part to an air processing part in a bypass mode; the blower (3) sends the air after heat and humidity treatment to the indoor at the downwind side of the evaporator b (2) and the bypass air valve a (9).
3. The tie epidemic prevention combined adjustable working condition variable channel air handling unit with exhaust energy recovery of claim 1, characterized in that: the air return part comprises an air return fan (4), an exhaust valve (7) and a condensation part of an energy recoverer (5), the air return fan (4) is arranged at an inlet of an air return opening, the air return valve (6) and the condensation part of the energy recoverer (5) are arranged at a positive pressure section of an outlet of the air return fan (4), one part of return air is adjusted by the air return valve (6) to bypass to an air treatment part, and the other part of return air passes through the condensation part of the energy recoverer (5) and the exhaust valve (7) in sequence and then is discharged outdoors.
4. The tie epidemic prevention combined adjustable working condition variable channel air handling unit with exhaust energy recovery of claim 1, characterized in that: the air return valve (6), the fresh air valve (8) and the exhaust valve (7) can be proportionally adjusted in air quantity and opened and closed by an electric air valve actuator, and the air return fan (4) and the air feeder (3) can be adjusted in air quantity by a frequency converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020481537.5U CN212179166U (en) | 2020-04-06 | 2020-04-06 | Air handling unit with exhaust energy recovery function and adjustable working condition variable channels |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020481537.5U CN212179166U (en) | 2020-04-06 | 2020-04-06 | Air handling unit with exhaust energy recovery function and adjustable working condition variable channels |
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| Publication Number | Publication Date |
|---|---|
| CN212179166U true CN212179166U (en) | 2020-12-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020481537.5U Active CN212179166U (en) | 2020-04-06 | 2020-04-06 | Air handling unit with exhaust energy recovery function and adjustable working condition variable channels |
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| CN (1) | CN212179166U (en) |
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2020
- 2020-04-06 CN CN202020481537.5U patent/CN212179166U/en active Active
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