CN113137671A - Air conditioning system with heat recovery function - Google Patents
Air conditioning system with heat recovery function Download PDFInfo
- Publication number
- CN113137671A CN113137671A CN202110396854.6A CN202110396854A CN113137671A CN 113137671 A CN113137671 A CN 113137671A CN 202110396854 A CN202110396854 A CN 202110396854A CN 113137671 A CN113137671 A CN 113137671A
- Authority
- CN
- China
- Prior art keywords
- heat exchanger
- air
- fresh air
- conditioning system
- air conditioning
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004378 air conditioning Methods 0.000 title claims abstract description 59
- 238000011084 recovery Methods 0.000 title claims abstract description 34
- 239000003507 refrigerant Substances 0.000 claims abstract description 25
- 238000001816 cooling Methods 0.000 claims description 19
- 238000003303 reheating Methods 0.000 claims description 19
- 238000000746 purification Methods 0.000 claims description 12
- 230000002070 germicidal effect Effects 0.000 claims description 8
- 230000000844 anti-bacterial effect Effects 0.000 claims 1
- 230000009471 action Effects 0.000 abstract description 6
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 20
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 16
- 238000010438 heat treatment Methods 0.000 description 10
- 238000007791 dehumidification Methods 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 238000001914 filtration Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000007710 freezing Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000001954 sterilising effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 241000700605 Viruses Species 0.000 description 2
- 238000004887 air purification Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000249 desinfective effect Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
- F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
- F24F12/002—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an intermediate heat-transfer fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/34—Heater, e.g. gas burner, electric air heater
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Central Air Conditioning (AREA)
Abstract
The invention provides an air conditioning system with a heat recovery function, belongs to the technical field of air conditioning equipment, and aims to solve the problem that the fresh air temperature does not meet the indoor temperature requirement when an outdoor unit in the conventional air conditioning system breaks down or frosts. The air conditioning system comprises a first heat exchanger, a second heat exchanger and a surface air cooler, wherein the first heat exchanger and the surface air cooler are arranged in a fresh air channel, and the second heat exchanger is arranged in an exhaust air channel; the refrigerant flows between the first heat exchanger and the second heat exchanger under the action of the circulating pump. The surface cooler is communicated with a heat source or a cold source and is used for precooling or preheating fresh air. The air conditioning system provided by the invention can recycle heat or cold in indoor exhaust air by utilizing the first heat exchanger and the second heat exchanger, and the matched surface air cooler can dehumidify and heat fresh air without an outdoor unit, so that the problem that the temperature of the fresh air does not meet the indoor temperature requirement due to the failure and frosting of the outdoor unit can be avoided.
Description
Technical Field
The invention belongs to the field of air conditioning equipment, and particularly relates to an air conditioning system with a heat recovery function.
Background
The ward and operating room of hospital have high requirement for indoor air environment, and need to keep sending a large amount of fresh air into the room, and the fresh air still needs to have suitable temperature and humidity.
When the existing air conditioning system operates in summer, outdoor high-temperature and high-humidity fresh air can be sent into a room after being dehumidified, and when the existing air conditioning system operates in winter, the fresh air needs to be heated; at present, the scheme that an air-cooled direct-expansion outdoor unit is matched with a dehumidifying heat exchanger in a fresh air duct is generally adopted to realize deep dehumidification and temperature rise of fresh air.
However, when the outdoor unit fails, normal heating or cooling cannot be performed, so that the temperature and humidity of fresh air do not meet the requirements; or when the air conditioning system runs in winter, the outdoor unit needs defrosting, the outdoor unit cannot heat during defrosting, the temperature of fresh air is low, and the indoor temperature requirement cannot be met.
Disclosure of Invention
In order to solve the above-mentioned problem among the prior art, this application provides an air conditioning system with heat recovery function, and it can solve among the current air conditioning system when outdoor unit breaks down or frosts, leads to the new trend temperature to be not conform to the indoor temperature demand.
The application provides an air conditioning system with heat recovery function includes:
the shell is provided with a fresh air channel and an exhaust channel;
the heat recovery unit comprises a first heat exchanger, a second heat exchanger and a circulating pump, wherein the first heat exchanger is arranged in the fresh air channel, and the second heat exchanger is arranged in the exhaust channel;
the first heat exchanger is communicated with the second heat exchanger, and the circulating pump can suck secondary refrigerant so that the secondary refrigerant flows between the first heat exchanger and the second heat exchanger;
the surface cooler group is arranged in the fresh air channel and comprises at least one surface cooler, and the surface cooler is positioned on one side of the first heat exchanger, which is far away from the fresh air inlet; the surface cooler is communicated with a heat source or a cold source and is used for dehumidifying or heating fresh air.
In the above preferred technical solution, the heat recovery unit further includes a precooling heat exchanger and a reheating heat exchanger which are communicated with each other;
the precooling heat exchanger and the reheating heat exchanger are arranged in the fresh air channel, and the precooling heat exchanger and the reheating heat exchanger are respectively positioned on two sides of the surface air cooler.
In the above preferred technical solution, the pre-cooling heat exchanger is located at a side of the first heat exchanger close to the fresh air inlet; or the precooling heat exchanger is positioned between the first heat exchanger and the surface cooler.
In the above preferred technical solution, the surface air cooler group includes a first surface air cooler and a second surface air cooler working independently, and the first surface air cooler and the second surface air cooler are respectively communicated with the cold source or the heat source.
In the above preferred technical solution, the air conditioning system further includes an auxiliary heater;
the auxiliary heater sets up in the new trend passageway, just auxiliary heater is located the surface cooler is kept away from one side of new trend entry.
In the above preferred technical solution, the air conditioning system further includes an isothermal humidifier;
the isothermal humidifier is arranged in the fresh air channel and is positioned on one side, away from the fresh air inlet, of the auxiliary heater.
In the above preferred technical solution, the air conditioning system includes a first fan wall and a second fan wall, the first fan wall is disposed in the fresh air channel, and the first fan wall has at least two first fans;
the second fan wall is arranged in the air exhaust channel and at least provided with two second fans.
In the above preferred technical solution, the air conditioning system includes a first purification unit and a second purification unit;
the first purifying unit is arranged in the fresh air channel and at least comprises a first coarse filter, a first medium-efficiency filter and a sub-high-efficiency filter which are sequentially arranged along the air inlet direction;
the second purifying unit is arranged in the exhaust channel and at least comprises a second coarse filter, a second medium filter and a high-efficiency filter which are sequentially arranged along the exhaust direction.
In the above preferred technical solution, the first fan is located between the first coarse filter and the first middle-effect filter, and the first middle-effect filter is located on one side of the heat recovery unit close to the fresh air inlet;
the second heat exchanger is located between the high-efficiency filter and the second fan.
In the above preferred technical solution, the air exhaust device further comprises a plurality of germicidal lamps, and the germicidal lamps are arranged in the fresh air channel and the air exhaust channel at intervals.
Compared with the prior art, the air conditioning system with the heat recovery function has the following advantages:
the air conditioning system with the heat recovery function comprises a heat recovery unit and a surface cooler unit; the first heat exchanger of the heat recovery unit is arranged in the fresh air channel, and secondary refrigerant flowing to the first heat exchanger can exchange heat with fresh air; the second heat exchanger of the heat recovery unit is arranged in the exhaust channel, and secondary refrigerant flowing to the second heat exchanger can exchange heat with indoor exhaust air. The surface air cooler group is positioned in the fresh air channel and communicated with an external cold source or a heat source, and is used for dehumidifying and heating fresh air.
When the air conditioning system operates in summer, the secondary refrigerant in the second heat exchanger exchanges heat with indoor exhaust air, and the temperature of the secondary refrigerant is reduced; the movable heat exchanger can move to the first heat exchanger under the action of the circulating pump, the secondary refrigerant exchanges heat with fresh air, the temperature of the fresh air can be reduced, and the fresh air can be precooled. And the precooled fresh air is subjected to deep dehumidification through a surface air cooler unit. At this time, the surface cooler is communicated with an external cold source.
When the air conditioning system operates in winter, the secondary refrigerant in the second heat exchanger exchanges with indoor exhaust air, the secondary refrigerant absorbs heat in the exhaust air, and the temperature of the secondary refrigerant is increased; the cold-carrying agent can move to the first heat exchanger under the action of the circulating pump, and the secondary refrigerant exchanges heat with fresh air to raise the temperature of the fresh air and preheat the fresh air; the preheated fresh air is further heated through the surface air cooler, and the surface air cooler is communicated with an external heat source at the moment.
According to the air conditioning system with the heat recovery function, the heat or the cold in indoor exhaust air can be recycled by means of the first heat exchanger and the second heat exchanger; the surface cooler group is matched for dehumidifying and heating the fresh air, so that the dehumidifying and heating requirements of the fresh air are met; need not to be provided with the off-premises station to can avoid leading to new trend temperature, humidity to be not conform to the problem of indoor temperature demand because of off-premises station trouble and frosting.
Drawings
Fig. 1 is a first schematic structural diagram of an air conditioning system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an air conditioning system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a first fan wall provided in the embodiment of the present application.
Description of reference numerals:
10-a first housing; 11-a fresh air channel; 12-fresh air inlet; 13-fresh air outlet;
20-a second housing; 21-an exhaust channel; 22-air return inlet; 23-an air outlet;
31-a first heat exchanger; 32-a second heat exchanger; 33-precooling heat exchanger; 34-a reheat heat exchanger;
41-a first surface cooler; 42-a second surface cooler;
50-a first fan wall; 51-a first fan;
60-a second fan wall; 61-a second fan;
71-a first coarse filter; 72-a first intermediate-efficiency filter; 73-sub-high efficiency filter; 74-a second coarse filter; 75-a second medium effect filter; 76-high efficiency filter;
81-auxiliary heater; 82-isothermal humidifier;
90-germicidal lamp.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention.
As shown in fig. 1, an air conditioning system provided in an embodiment of the present application includes:
the casing, including first casing 10 and the second casing 20 that links together, first casing 10 and second casing 20 all are the tubular structure, and first casing 10 can set up in the below of second casing 20, and first casing 10 has the cavity in order to form new trend passageway 11, new trend passageway 11's one end and indoor intercommunication, the other end and outdoor intercommunication. The first fan 51 is arranged in the fresh air channel 11, and the outside fresh air can be conveyed to the indoor space under the action of the first fan 51.
Further, the first casing 10 is provided with a fresh air section and an air outlet section, and the fresh air section and the air outlet section respectively belong to the components of the fresh air channel 11. The fresh air section is provided with a fresh air inlet 12, and the fresh air inlet 12 is communicated with the fresh air channel 11; the air outlet section is provided with a fresh air outlet 13, the fresh air outlet 13 can be arranged opposite to the fresh air inlet 12, and the fresh air outlet 13 is communicated with the fresh air channel 11.
The second casing 20 has a cavity to form a discharge passage 21, one end of the discharge passage 21 communicates with the indoor, and the other end of the discharge passage 21 communicates with the outdoor. The second fan 61 is disposed in the exhaust passage 21, and the indoor air can be exhausted to the outdoor by the second fan 61, so as to improve the indoor air quality.
Similarly, the second casing 20 has an air intake section and an air discharge section, and the air intake section and the air discharge section are respectively included in the air discharge duct 21. The air inlet section is provided with an air return opening 22, and the air return opening 22 is communicated with the exhaust channel 21; the air exhaust section is provided with an air exhaust port 23, the air exhaust port 23 can be arranged opposite to the air return port 22, and the air exhaust port 23 is communicated with the air exhaust channel 21.
It can be understood that the first casing 10 and the second casing 20 can be integrated to facilitate the installation of the heat exchangers in the heat recovery unit in the fresh air channel 11 and the exhaust air channel 21, and also to reduce the installation space and the floor space of the whole air conditioning system.
The heat recovery unit is used for recycling heat or cold in indoor exhaust air so as to reduce the energy consumption of the whole air conditioning system and reduce the operation cost. The heat recovery unit comprises a first heat exchanger 31, a second heat exchanger 32 and a secondary refrigerant circulating pipeline for connecting the first heat exchanger 31 and the second heat exchanger 32; and the secondary refrigerant circulating pipeline is internally provided with a circulating pump, and the secondary refrigerant can flow in the secondary refrigerant circulating pipeline under the suction action of the circulating pump.
The coolant provided by this embodiment may be glycol solution, and when the glycol solution flows to the second heat exchanger 32 located in the exhaust channel 21, the glycol solution exchanges heat with the air exhausted from the room, and the temperature of the glycol solution is reduced (increased). Under the action of the circulating pump, the glycol solution flows to the first heat exchanger 31 positioned in the fresh air channel 11, and the glycol solution exchanges heat with fresh air entering the fresh air channel 11, so that the temperature of the fresh air can be reduced (increased); thereby realizing the recycling of heat (cold) in indoor exhaust air so as to realize the precooling or preheating of fresh air; thereby achieving the purpose of reducing energy consumption.
And the surface cooler group is arranged in the fresh air channel and is positioned on one side of the first heat exchanger away from the fresh air inlet, namely, the fresh air can be subjected to deep dehumidification or temperature rise through the surface cooler group after being preheated or precooled by the first heat exchanger. The surface cooler group in this embodiment includes at least one surface cooler, and each surface cooler communicates with outside cold source or heat source respectively.
For example, the cold source may be chilled water having a certain temperature, and the heat source may be hot water having a certain temperature; when the air conditioning system runs in summer, the surface cooler is connected with chilled water to cool and dehumidify fresh air; when the air conditioning system runs in winter, fresh air generally does not need to be dehumidified, and only needs to be heated; the surface cooler assembly is connected with hot water to heat the fresh air.
For example, when the air conditioning system works in summer, the indoor exhaust air temperature is 24 ℃, the indoor exhaust air passes through the second heat exchanger 32 and exchanges heat with the glycol solution, the temperature of the glycol solution is reduced, and the exhaust air temperature is increased to 30 ℃. The outdoor fresh air temperature is 35 ℃, the fresh air passes through the first heat exchanger 31 and exchanges heat with the glycol solution, the temperature of the glycol solution is increased, and the temperature of the fresh air can be reduced to 28 ℃, so that the fresh air can be precooled by utilizing the cold energy of indoor exhaust air; and deeply dehumidifying the precooled fresh air by the surface cooler group so that the humidity of the fresh air meets the indoor requirement.
When the air conditioning system works in winter, the indoor exhaust air temperature is 22 ℃, the indoor exhaust air passes through the second heat exchanger 32 and exchanges heat with the glycol solution, the temperature of the glycol solution rises, and the exhaust air temperature can be reduced to 16 ℃. The outdoor fresh air temperature is 0 ℃, the fresh air passes through the first heat exchanger 31 and exchanges heat with the glycol solution, the temperature of the glycol solution is reduced, and the temperature of the fresh air can be increased to 10 ℃; therefore, the fresh air is preheated by utilizing the heat in the indoor exhaust air; the preheated fresh air is further heated by a surface cooler group, so that the temperature of the fresh air meets the indoor requirement.
The air conditioning system with the heat recovery function provided by the embodiment recycles heat or cold in indoor exhaust air through the first heat exchanger 31 arranged in the fresh air channel and the second heat exchanger 32 arranged in the exhaust air channel, and dehumidifies and heats fresh air by matching with the surface cooler group. Compared with a heat pump refrigerating system adopting an air-cooled direct-expansion outdoor unit and a dehumidifying heat exchanger in a fresh air duct in the prior art, the outdoor unit and the dehumidifying heat exchanger are not required to be arranged in the embodiment of the application, so that the air conditioning system provided by the embodiment of the application is not influenced by the working condition of the outdoor unit, and the problem that the fresh air temperature and the humidity are not accordant with the indoor temperature requirement due to the failure and frosting of the outdoor unit can be avoided.
On the basis of the above embodiments, the heat recovery unit provided in the embodiment of the present application further includes a pre-cooling heat exchanger 33 and a reheating heat exchanger 34, where the pre-cooling heat exchanger 33 is also called a heat pipe heat recovery pre-cooling heat exchanger 33, and the reheating heat exchanger 34 is also called a heat pipe heat recovery reheating heat exchanger 34, that is, the heat recovery unit further includes a heat pipe heat recovery device having the heat pipe heat recovery pre-cooling heat exchanger 33 and the heat pipe heat recovery reheating heat exchanger 34.
The pre-cooling heat exchanger 33 is communicated with the reheating heat exchanger 34 to form a refrigerant circulation system, and the refrigerant flows in the refrigerant circulation system and is subjected to phase change in the pre-cooling heat exchanger 33 and the reheating heat exchanger 34 respectively to release heat or absorb heat. The precooling heat exchanger 33 and the reheating heat exchanger 34 are arranged in the fresh air channel and are respectively positioned at two sides of the surface cooler group.
When the air conditioning system runs in summer, the refrigerant is evaporated in the precooling heat exchanger 33 and forms a gaseous refrigerant, and the refrigerant absorbs heat in fresh air in the process so as to cool the fresh air to achieve the aim of precooling; after the fresh air is deeply dehumidified by the surface air cooler unit, the temperature of the fresh air is lower and may be lower than the temperature requirement of the indoor fresh air.
When the deeply dehumidified fresh air passes through the reheating heat exchanger 34, the gaseous refrigerant is condensed in the reheating heat exchanger 34 to release heat, so that the deeply dehumidified fresh air is heated. So set up, heat in the abundant recovery and the utilization new trend to combine heat pipe heat reclamation device, heat up the temperature of the new trend after the dehumidification, with the temperature of regulation entering indoor new trend, need not to establish in addition heating device and heat the new trend after the dehumidification, thereby reduce air conditioning system's energy resource consumption, reduce running cost.
Further, the pre-cooling heat exchanger 33 in this embodiment may be located on one side of the first heat exchanger 31 close to the fresh air inlet; under the scheme, fresh air is firstly subjected to primary precooling through the precooling heat exchanger 33, and then subjected to secondary precooling through the first heat exchanger 31 to exchange heat with the surface air cooler group so as to complete deep dehumidification.
Alternatively, the pre-cooling heat exchanger 33 is located on a side of the first heat exchanger 31 away from the fresh air inlet, that is, the pre-cooling heat exchanger 33 is located between the first heat exchanger 31 and the surface air cooler group. Under the scheme, fresh air firstly passes through the first heat exchanger 31 for preliminary precooling, and then passes through the precooling heat exchanger 33 for secondary precooling, and then exchanges heat with the surface cooler group to complete deep dehumidification. The position of precooling heat exchanger 33 for first heat exchanger 31 is not restricted in this embodiment to can realize carrying out the secondary precooling to the new trend, and can utilize reheat heat exchanger 34 to heat the new trend after the degree of depth dehumidification can.
On the basis of the above embodiments, the surface cooler group provided in the embodiments of the present application includes two surface coolers, which is convenient for describing the present embodiment; the two surface coolers are a first surface cooler 41 and a second surface cooler 42, respectively. The first surface air cooler 41 and the second surface air cooler 42 can be arranged up and down, that is, the second surface air cooler 42 is positioned above the first surface air cooler 41, the water inlet of the first surface air cooler 41 and the water inlet of the second surface air cooler 42 are respectively communicated with the water inlet pipe of the cold source or the water inlet pipe of the heat source, and the water inlet outlets of the first surface air cooler 41 and the second surface air cooler 42 are respectively provided with a water inlet valve. Similarly, the water outlets of the first surface air cooler 41 and the second surface air cooler 42 are respectively communicated with the water inlet pipe of the cold source or the water inlet pipe of the heat source.
The working states of the first surface air cooler 41 and the second surface air cooler 42 can be controlled by the water inlet valve and the water outlet valve of each surface air cooler, namely, the first surface air cooler 41 and the second surface air cooler 42 can work independently. For example, when the outdoor high-temperature high-humidity fresh air is dehumidified in summer, the first surface air cooler 41 and the second surface air cooler 42 can be respectively controlled to be in the working state, so that the contact area of the fresh air is increased, and the precooling effect is improved.
When the temperature of outdoor low-temperature air is raised in winter, one surface cooler can be controlled to be in a working state. For example, the first surface cooler 41 is turned on and the second surface cooler 42 is turned off. If the surface air cooler operates in summer, the refrigerating capacity of one surface air cooler in the related art is the same as that of the first surface air cooler 41 and the second surface air cooler 42 in the application; however, in winter, the demand for the amount of heating of the refrigerator is reduced, and therefore, the flow rate of the hot water flowing into the surface cooler is small and the flow rate is low. Especially when external new trend temperature is lower, be provided with a surface cooler among the correlation technique, hot-water circulation flows slowly, causes the inside phenomenon of freezing and appearing freezing out of surface cooler easily.
However, in the embodiment, the two first surface coolers 41 and the second surface cooler 42 are arranged in parallel, when the surface coolers are operated in winter, the second surface cooler 42 can be closed, and the flow rate of the hot water in the first surface cooler 41 can be ensured under the same flow rate of the hot water, so that the phenomenon of freezing damage caused by the ice in the first surface cooler 41 can be avoided. So set up, can satisfy the efficiency of the cooling precooling of the air of external high temperature and high humidity in summer, also can guarantee the demand of preheating external low temperature air when the operation in winter, prevent that the surface cooler from appearing freezing the phenomenon, reinforcing air conditioning system's reliability.
Referring to fig. 1, the air conditioning system provided in this embodiment includes a first purification unit and a second purification unit; the first purifying unit is arranged in the fresh air channel 11 and at least comprises a filter for removing dust and purifying air introduced into the fresh air channel 11; the second purifying unit is arranged in the exhaust channel 21 and at least comprises a filter for purifying and sterilizing indoor exhaust air.
Further, according to the requirement of fresh air purification, the first purification unit can include a first coarse filter 71, a first middle-efficiency filter 72 and a sub-high-efficiency filter 73, and along the fresh air inlet direction, the first coarse filter 71, the second middle-efficiency filter 72 and the sub-high-efficiency filter 73 are sequentially arranged in the fresh air channel 11.
The first coarse filter 71 is located in the fresh air section of the fresh air channel 11 and is arranged close to the fresh air inlet 12, so that fresh air flowing into the fresh air channel 11 can be subjected to primary filtration, and particles with large particle sizes in the air can be removed. Further, the first coarse filter 71 can be disposed on one side of the first fan 51 close to the fresh air inlet 12, so that the air entering the fresh air channel 11 can pass through the first coarse filter 71 and then pass through the first fan 51, thereby preventing large-particle-size particles in the outside fresh air from polluting the first fan 51, and further improving the reliability and the service life of the first fan 51.
The first intermediate-efficiency filter 72 can filter small-particle-size particles in the fresh air. The first intermediate filter 72 may be disposed on a side of the heat recovery unit close to the fresh air inlet, that is, when the first heat exchanger 31 is disposed on a side of the pre-cooling heat exchanger 33 close to the fresh air inlet, the first intermediate filter may be disposed between the first fan 51 and the first heat exchanger 31. When the pre-cooling heat exchanger 33 is disposed on a side of the first heat exchanger 31 close to the fresh air inlet, the first middle-effect filter may be disposed between the first fan 51 and the pre-cooling heat exchanger 33.
So set up, can make the new trend that gets into in the new trend passageway 11 through first coarse filter 71, first medium efficiency filter 72 after, when carrying out the heat exchange with precooling heat exchanger 33, first heat exchanger 31 and surface cooler, can avoid the adhesion of path particulate matter etc. in the air to the surface of above-mentioned heat exchanger and breed the bacterium.
Inferior high efficiency filter 73 sets up in the air-out section of new trend passageway 11 to be close to new trend export 13 setting, it can further filter the micronic dust of the air of influx new trend passageway 11 in, promotes new trend quality.
According to the indoor exhaust air purification requirement, the second purification unit comprises a second coarse filter 74, a second medium filter 75 and a high efficiency filter 76. In the air outlet direction, a second coarse filter 74, a second intermediate filter 75, and a high efficiency filter 76 are arranged in this order in the discharge duct 21. Wherein the second coarse filter 74 may be disposed near the air return opening 22 of the exhaust passage 21, and the high efficiency filter 76 may be disposed near the exhaust opening 23 of the exhaust passage 21. The functions of the second coarse filter 74 and the second intermediate filter 75 are the same as those of the first coarse filter 71 and the first intermediate filter 72, and are not described again here.
The high efficiency filter 76 can kill the virus in the indoor exhaust air, and the high efficiency filter 76 is arranged on the side of the second heat exchanger 32 close to the air return opening 22 in the embodiment. With this arrangement, adhesion of viruses in the exhaust air to the surface of the second heat exchanger 32 can be prevented.
It should be understood that the first coarse filter 71, the first intermediate filter 72, and the sub-high efficiency filter 73 included in the first purification unit, and the second coarse filter 74, the second intermediate filter 75, and the high efficiency filter 76 included in the second purification unit are only one of the embodiments, and are not limited to the embodiment.
For example, when the air conditioning system is applied to a clean area, only a coarse filter and a medium filter are arranged in the fresh air channel 11 to perform two-stage filtration on fresh air; without having sub-efficient filtration. In such an environment, the exhaust duct 21 may be arranged with only a coarse filter.
When the air conditioning system is applied to a semi-polluted area and a polluted area combined with epidemic prevention, the fresh air channel 11 can be internally provided with three-stage filtration of a coarse filter, a medium filter and a sub-high efficiency filter; can be provided with coarse filter, medium efficiency filter, high efficiency filter in the passageway 21 of airing exhaust and carry out tertiary filtration to indoor exhaust, this scheme is the preferred scheme of this embodiment to promote air conditioning system's suitability, promote the purifying effect of new trend.
Referring to fig. 1 and 2, based on the above embodiments, in the air conditioning system provided in this embodiment, a first fan wall 50 is disposed in the fresh air channel 11, the first fan wall 50 is provided with at least two first fans 51, and the first fan wall 50 may be disposed between a first coarse filter 71 and a first middle filter 72 to prevent large-diameter particles in the fresh air from adhering to the first fans 51.
Likewise, a second fan wall 60 is provided in the exhaust duct 21, the second fan wall 60 is provided with at least two second fans 61, and the second fan wall 60 is provided near the exhaust outlet 23 of the exhaust duct 21, which may be provided at a side of the second heat exchanger 32 near the exhaust outlet 23.
In the related art, the fresh air channel 11 and the exhaust air channel 21 are respectively provided with a fan, and the fan usually adopts a variable frequency fan, which can adjust the frequency according to a blast pipe differential pressure transmitter to ensure the blast pressure. In practical engineering debugging, the frequency of the fan is usually operated at-50 Hz, and the lower limit of operation is 25 Hz. When the running frequency of the fan is 25Hz, the air output is reduced to 50 percent, the requirement that the fresh air quantity is reduced from 6 times/h to 3 times/h can be met, but the air supply pressure is reduced to 25 percent, and the requirement that the basic air supply pressure cannot be ensured due to too low air pressure can be met. Therefore, in the related art, the fresh air channel 11 and the exhaust air channel 21 are only provided with one fan, the air volume adjusting range is narrow, the air supply pressure cannot be ensured, and the requirement of fresh air volume in the epidemic prevention mode cannot be met.
However, in this embodiment, at least two first fans 51 are disposed in the fresh air channel 11, and at least two second fans 61 are disposed in the exhaust air channel 21, so that the number of fans can be selected according to different modes, the air volume adjusting range can be increased, and the air volume requirements in different modes can be met.
Referring to fig. 3, illustratively, 6 first fans 51 are arranged side by side on the first fan wall 50; similarly, the second fan wall 60 is provided with 6 second fans 61 side by side. Taking the negative pressure ward as an example, the minimum fresh air volume is 2 times/h at ordinary times, and the minimum fresh air volume is 6 times/h under special conditions. Under special circumstances, the first fan 51 in the fresh air channel 11 can be fully opened, the second fan 61 in the exhaust channel 21 is fully opened, and fresh air volume can be born by a plurality of fans, so that the condition that the lower limit of fan operation is too low, and the air pressure is small and cannot meet the air supply requirement is avoided. When the wind power generation device operates at ordinary times, part of the first fans 51 can be selected to work, and part of the second fans 61 can work, so that normal output of wind pressure and wind volume is ensured.
Referring to fig. 1, on the basis of the above embodiment, the air conditioning system provided in the embodiment of the present application further includes an auxiliary heater 81 and an isothermal humidifier 82, where the auxiliary heater 81 and the isothermal humidifier 82 are disposed in the fresh air channel 11 and are close to the fresh air outlet 13; namely, the auxiliary heater 81 and the isothermal humidifier 82 are positioned at the air outlet section of the fresh air channel 11.
Specifically, the auxiliary heater 81 may be disposed between the reheating heat exchanger 34 and the isothermal humidifier 82, and the auxiliary heater 81 is used to further regulate and raise the temperature of the fresh air passing through the reheating heat exchanger 34, so that the temperature of the fresh air delivered to the room meets the requirement. The heating manner of the auxiliary heater 81 may be one or a combination of electric heating, hot water heating, or steam heating.
The isothermal humidifier 82 is used for adjusting the humidity of the dehumidified fresh air, or when the air runs in winter, the fresh air does not need to be deeply dehumidified, and the isothermal humidifier 82 needs to be started to adjust the humidity of the fresh air. The humidification mode of the isothermal humidifier 82 may be one or a combination of electrode humidification, electro-thermal humidification, or dry vapor humidification.
Further, the air conditioning system provided by the embodiment of the present application further includes a plurality of germicidal lamps 90, and the germicidal lamps 90 may be ultraviolet germicidal lamps, and are used for sterilizing and disinfecting air flowing into the fresh air channel 11 and the exhaust air channel 21. It can be understood that a plurality of germicidal lamps 90 can be arranged in the fresh air channel 11 and the exhaust air channel 21 at intervals to improve the sterilizing effect.
The following describes a process of the air conditioning system provided by the embodiment of the present application, which is operated in summer and winter:
when the air conditioning system runs in summer, fresh air enters the fresh air channel 11, and after passing through the first coarse filter 71, the fresh air can filter particles such as dust with large particle size and can preliminarily purify the fresh air; to protect the first fan 51, the first heat exchanger 31, the surface cooler group, and the like of the rear stage. Then, the air is pressurized by a first fan 51 for air supply, and the frequency is adjusted according to a differential pressure transmitter of a main air supply pipe to ensure the constant air volume operation; the pressurized fresh air is finely filtered by the first middle-effect filter 72 to filter out small-particle-size particles, so that the particles are prevented from being attached to the surfaces of the rear-stage first heat exchanger 31, the surface cooler group and the like to influence normal heat exchange; first medium efficiency filter 72 is located the air supply malleation section behind first fan 51, can ensure the new trend cleanliness factor.
Then, fresh air is precooled by a precooling heat exchanger 33, and the fresh air with the high temperature of 35 ℃ can be precooled to 31 ℃; precooling the mixture to 27 ℃ for the second time by using a first heat exchanger 31, and circulating the ethylene glycol solution by using a circulating pump; the fresh air after two times of precooling is finally subjected to deep cooling dehumidification through a surface cooler group, and the fresh air state point is processed to 12 ℃/95%. The temperature of the dehumidified fresh air is adjusted to 16 ℃ through a reheating heat exchanger 34; if the heat quantity is insufficient, the auxiliary heater 82 can supplement the heat quantity; the fresh air after the heat and humidity treatment is filtered for the third time through the sub-high efficiency filter 73 so as to meet the purification requirement. The air outlet section is provided with an ultraviolet germicidal lamp for sterilizing the air supply and finally sending the air to the room.
After the air exhausted from the room enters the air exhaust channel 21, the air firstly passes through the three-stage filter of the second coarse filter 74, the second medium filter 75 and the high efficiency filter 76, the exhaust air reaches the purification requirement, and the cold quantity of the exhaust air is recycled after the clean exhaust air passes through the second heat exchanger 32; the temperature of indoor exhaust air is raised to 28 ℃ from 22 ℃, and the glycol solution is conveyed to the first heat exchanger 31 again through the circulating pump after being cooled by the indoor exhaust air so as to pre-cool fresh air. The indoor discharge air after the cold recovery is discharged to the outside of the room through the second fan 61.
When the air filter operates in winter, the air filtering process is the same as that in summer, and the description is omitted here. The heat and humidity process is as follows: the pre-cooling heat exchanger 33 and the reheating heat exchanger 34 are not used. Fresh air at the temperature of 0 ℃ outdoors is preheated to 6 ℃ through a first heat exchanger 31; the opening number of the surface cooler groups is determined according to indoor heat load, so that the phenomenon of frost damage after the surface cooler groups are all started is prevented. The preheated fresh air is further heated to 30 ℃ through a surface cooler group; and finally, the humidity is adjusted by an isothermal humidifier 82 and then the air is sent to the room. The indoor exhaust air passes through the second heat exchanger 32 to recover the heat of the exhaust air, and the temperature of the indoor exhaust air is reduced from 20 ℃ to 12-16 ℃. After absorbing the heat of the indoor exhaust air and raising the temperature, the glycol solution is conveyed to the first heat exchanger 31 again through the circulating pump so as to preheat the fresh air; the exhaust air after the heat recovery is discharged to the outside through the second fan 61.
So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.
Claims (10)
1. An air conditioning system with heat recovery, comprising:
the shell is provided with a fresh air channel and an exhaust channel;
the heat recovery unit comprises a first heat exchanger, a second heat exchanger and a circulating pump, wherein the first heat exchanger is arranged in the fresh air channel, and the second heat exchanger is arranged in the exhaust channel;
the first heat exchanger is communicated with the second heat exchanger, and the circulating pump can suck secondary refrigerant so that the secondary refrigerant flows between the first heat exchanger and the second heat exchanger;
the surface cooler group, set up in the new trend passageway, the surface cooler group is including at least one surface cooler, the surface cooler is located one side that the new trend entry was kept away from to first heat exchanger, just the surface cooler communicates with heat source or cold source for dehumidify or heat the new trend.
2. The air conditioning system of claim 1, wherein the heat recovery unit further comprises a pre-cooling heat exchanger and a reheating heat exchanger which are arranged in communication;
the precooling heat exchanger and the reheating heat exchanger are arranged in the fresh air channel, and the precooling heat exchanger and the reheating heat exchanger are respectively positioned on two sides of the surface air cooler.
3. The air conditioning system of claim 2, wherein the pre-cooling heat exchanger is located on a side of the first heat exchanger proximate the fresh air inlet; or
The precooling heat exchanger is positioned between the first heat exchanger and the surface cooler.
4. The air conditioning system of claim 1, wherein the surface cooler group comprises a first surface cooler and a second surface cooler that operate independently;
the first surface air cooler and the second surface air cooler are respectively communicated with the cold source or the heat source.
5. The air conditioning system of any of claims 1 to 4, further comprising an auxiliary heater;
the auxiliary heater sets up in the new trend passageway, just auxiliary heater is located the surface cooler is kept away from one side of new trend entry.
6. The air conditioning system of claim 5, further comprising an isothermal humidifier;
the isothermal humidifier is arranged in the fresh air channel and is positioned on one side, away from the fresh air inlet, of the auxiliary heater.
7. The air conditioning system of any of claims 1 to 4, wherein the air conditioning system comprises a first fan wall and a second fan wall;
the first fan wall is arranged in the fresh air channel and at least provided with two first fans;
the second fan wall is arranged in the air exhaust channel and at least provided with two second fans.
8. The air conditioning system of claim 7, wherein the air conditioning system comprises a first purification unit and a second purification unit;
the first purifying unit is arranged in the fresh air channel and at least comprises a first coarse filter, a first medium-efficiency filter and a sub-high-efficiency filter which are sequentially arranged along the air inlet direction;
the second purifying unit is arranged in the exhaust channel and at least comprises a second coarse filter, a second medium filter and a high-efficiency filter which are sequentially arranged along the exhaust direction.
9. The air conditioning system of claim 8, wherein the first fan is located between the first coarse filter and the first intermediate filter;
the first middle-effect filter is positioned on one side of the heat recovery unit close to the fresh air inlet;
the second heat exchanger is located between the high-efficiency filter and the second fan.
10. The air conditioning system of any of claims 1 to 4, further comprising a plurality of germicidal lamps;
the bactericidal lamps are arranged in the fresh air channel and the exhaust channel at intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110396854.6A CN113137671A (en) | 2021-04-13 | 2021-04-13 | Air conditioning system with heat recovery function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110396854.6A CN113137671A (en) | 2021-04-13 | 2021-04-13 | Air conditioning system with heat recovery function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113137671A true CN113137671A (en) | 2021-07-20 |
Family
ID=76812224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110396854.6A Pending CN113137671A (en) | 2021-04-13 | 2021-04-13 | Air conditioning system with heat recovery function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113137671A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114110980A (en) * | 2021-11-24 | 2022-03-01 | 广东美的制冷设备有限公司 | Fresh air equipment control method and device, fresh air equipment and storage medium |
| CN114935174A (en) * | 2022-01-10 | 2022-08-23 | 西安四腾环境科技有限公司 | Modular air conditioning unit for variable-grade clean operating room |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19501949A1 (en) * | 1995-01-24 | 1996-07-25 | Walter Neumayer | Method of retaining healthy living climate in centrally heated room |
| CN101363649A (en) * | 2008-09-25 | 2009-02-11 | 上海交通大学 | Geothermal heat pump air conditioning system for independently controlling temperature and humidity |
| CN101435607A (en) * | 2008-12-22 | 2009-05-20 | 哈尔滨工业大学 | Air processing unit based on air blast thermal recovery and energy step utilization |
| CN204665595U (en) * | 2015-05-29 | 2015-09-23 | 北京网电盈科科技发展有限公司 | Tandem heat-recycling air treatment device |
| CN211316433U (en) * | 2020-01-02 | 2020-08-21 | 湖南红橡室内气候技术有限公司 | Fresh air humidifying unit |
| CN111928408A (en) * | 2020-08-15 | 2020-11-13 | 天津大学 | Heat pipe waste heat recovery and reheating fresh air system |
-
2021
- 2021-04-13 CN CN202110396854.6A patent/CN113137671A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19501949A1 (en) * | 1995-01-24 | 1996-07-25 | Walter Neumayer | Method of retaining healthy living climate in centrally heated room |
| CN101363649A (en) * | 2008-09-25 | 2009-02-11 | 上海交通大学 | Geothermal heat pump air conditioning system for independently controlling temperature and humidity |
| CN101435607A (en) * | 2008-12-22 | 2009-05-20 | 哈尔滨工业大学 | Air processing unit based on air blast thermal recovery and energy step utilization |
| CN204665595U (en) * | 2015-05-29 | 2015-09-23 | 北京网电盈科科技发展有限公司 | Tandem heat-recycling air treatment device |
| CN211316433U (en) * | 2020-01-02 | 2020-08-21 | 湖南红橡室内气候技术有限公司 | Fresh air humidifying unit |
| CN111928408A (en) * | 2020-08-15 | 2020-11-13 | 天津大学 | Heat pipe waste heat recovery and reheating fresh air system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114110980A (en) * | 2021-11-24 | 2022-03-01 | 广东美的制冷设备有限公司 | Fresh air equipment control method and device, fresh air equipment and storage medium |
| CN114110980B (en) * | 2021-11-24 | 2023-11-28 | 广东美的制冷设备有限公司 | Fresh air equipment control method and device, fresh air equipment and storage medium |
| CN114935174A (en) * | 2022-01-10 | 2022-08-23 | 西安四腾环境科技有限公司 | Modular air conditioning unit for variable-grade clean operating room |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102425828B (en) | Energy saving device suitable for accurate control air conditioner in machine room | |
| CN204665595U (en) | Tandem heat-recycling air treatment device | |
| CN113137672B (en) | Air conditioning system | |
| CN203837171U (en) | Heat pump system for fan coil and heat recovery fresh-air conditioning unit | |
| CN103322656A (en) | Heat recycling air conditioner set | |
| CN113137671A (en) | Air conditioning system with heat recovery function | |
| CN109959099B (en) | Multifunctional dehumidifying fresh air waste heat recovery hot water air conditioning device | |
| CN113175715B (en) | Data center evaporative cooling and waste heat recovery unit and control method and device thereof | |
| CN103075767B (en) | Two low-temperature receiver Fresh air handling units | |
| CN206817624U (en) | Heat-recovery heat pump fresh air purifying unit | |
| CN112797511B (en) | Rotary dehumidification unit and control method thereof | |
| CN114562766A (en) | Fresh air handling unit and method | |
| KR101361582B1 (en) | Energy-saving outdoor air conditioning system with heat pump | |
| CN105509161A (en) | Air source dual-operation split air conditioner and operation method thereof | |
| KR102147578B1 (en) | Humidifier with cooling and heating function | |
| CN103075764A (en) | Double-cold source dehumidification air-conditioning unit | |
| EP3136022A1 (en) | Hybrid heat pump apparatus | |
| CN215597566U (en) | New hierarchical heat recovery system that airs exhaust | |
| JP4911968B2 (en) | Outside air cooling method and air conditioning system | |
| CN216814423U (en) | Air conditioning system with dehumidification function | |
| CN113154547A (en) | New hierarchical heat recovery system that airs exhaust | |
| CN203083044U (en) | Double-cold-resource fresh air handling unit | |
| CN110925889A (en) | Clean new trend processing system of many return strokes | |
| CN220017646U (en) | Double-stage energy recovery fresh air conditioning unit | |
| CN212594791U (en) | Energy-saving air temperature and humidity adjusting and filtering device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210720 |
|
| RJ01 | Rejection of invention patent application after publication |