CN111306653A - Heat recovery type fresh air processing system for severe cold and cold regions - Google Patents
Heat recovery type fresh air processing system for severe cold and cold regions Download PDFInfo
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- CN111306653A CN111306653A CN201811518027.4A CN201811518027A CN111306653A CN 111306653 A CN111306653 A CN 111306653A CN 201811518027 A CN201811518027 A CN 201811518027A CN 111306653 A CN111306653 A CN 111306653A
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- solution
- heat recovery
- total heat
- fresh air
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- 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
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
- F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
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- 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
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- 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 discloses a heat recovery type fresh air processing system for severe cold and cold regions. The heat recovery type fresh air processing system comprises a solution total heat recovery module, a solution humidifying module and an air heating/cooling device; the solution total heat recovery module comprises at least one stage of solution total heat recovery device, each stage of solution total heat recovery device comprises an upper layer solution total heat recovery device and a lower layer solution total heat recovery device, and the spraying solutions in the upper layer solution total heat recovery device and the lower layer solution total heat recovery device circulate through a circulating pipeline; the solution humidifying module comprises a solution humidifying device, wherein the spraying solution in the solution humidifying device circulates through a circulating pipeline, and a solution heater is arranged on the circulating pipeline; the fresh air pipeline sequentially flows through the lower-layer solution total heat recovery device, the solution humidifying device and the air heating/cooling device; the exhaust air flows through the upper solution total heat recovery device. The invention can meet the requirement of fresh air treatment all the year round, can realize the total heat recovery and the fresh air heating and humidifying treatment between the fresh air and the indoor exhaust air in winter, and can also meet the requirement of fresh air treatment in summer.
Description
Technical Field
The invention relates to a heat recovery type fresh air processing system for severe cold and cold regions, and belongs to the field of heating ventilation air conditioners.
Background
In the existing air conditioning system, the increase of the fresh air volume can effectively reduce the indoor carbon dioxide concentration and discharge indoor harmful pollutants to improve the indoor air quality, however, the increase of the fresh air volume inevitably increases the energy consumption of the fresh air system, and the construction of the heat recovery process between the fresh air and the exhaust air is an important measure for reducing the energy consumption of the fresh air system. Heat recovery devices are generally classified into sensible heat recovery and total heat recovery devices. The sensible heat recovery device can only recover the sensible heat of indoor exhaust air, and the total heat recovery device can recover both the sensible heat and the latent heat of the exhaust air. Because the latent heat part in the energy available for recovery by the exhaust air usually occupies a larger proportion, the heat recovery efficiency of the total heat recovery device is usually higher, and the total heat recovery device has larger energy-saving potential. In severe cold and cold regions, the conventional total heat recovery device is difficult to apply due to the fact that the conventional total heat recovery device is easy to freeze in winter because the outdoor temperature is low in winter. In the process of fresh air treatment, if the total heat recovery of exhaust air can be realized in summer and the total heat recovery device can normally operate in winter, the energy consumption of operation can be greatly saved. It is therefore desirable to provide a heat recovery type fresh air treatment system for use in severe cold and cold regions.
Disclosure of Invention
The invention aims to provide a heat recovery type fresh air processing system for severe cold and cold regions, which solves the application problem of a solution total heat recovery unit in the severe cold region by adding a solution preheating coil in a solution circulation process to improve the solution circulation concentration and avoid the risk of solution freezing, and adds a solution humidifying module and an air heating coil to meet the requirements of air supply parameters of constant temperature and constant humidity; the heat recovery type fresh air treatment system can be conveniently applied to summer working conditions, so that the annual air treatment requirement is met.
The heat recovery type fresh air processing system for the severe cold and cold regions comprises a solution total heat recovery module, a solution humidifying module and an air heater/cooler;
the solution total heat recovery module comprises at least one stage of solution total heat recovery device, each stage of solution total heat recovery device comprises an upper layer solution total heat recovery device and a lower layer solution total heat recovery device, and the upper layer solution total heat recovery device and the spray solution in the lower layer solution total heat recovery device circulate through a first solution circulation pipeline;
the solution humidifying module comprises a solution humidifying device, and the spraying solution in the solution humidifying device circulates through a second solution circulating pipeline; a second solution heater is arranged on the second solution circulating pipeline;
the fresh air pipeline sequentially flows through the lower-layer solution total heat recovery device, the solution humidifying device and the air heating/cooling device;
exhaust air flows through the upper solution total heat recovery device.
In the heat recovery type fresh air processing system, the first solution circulating pipeline is provided with the first solution heater, and the first solution heater provides a heat source for the total heat recovery device, so that the solution circulating concentration under the extremely low temperature condition in winter is improved, and the risk of solution freezing is prevented.
Specifically, the first solution heater is arranged at the upper part of the upper-layer solution total heat recovery device.
In the heat recovery type fresh air processing system, the second solution heater arranged on the second solution circulating pipeline provides a heat source for the solution humidifying device, and further humidifies the fresh air passing through the solution total heat recovery device so as to control the humidity (moisture content) of the air;
specifically, the second solution heater may be provided at an upper portion of the solution humidifying device.
In the heat recovery type fresh air processing system, the air heater/cooler can further heat the fresh air so as to control the temperature of the fresh air.
In the heat recovery type fresh air processing system, the first solution heater, the second solution heater and the air heater/cooler are all communicated with a heat source, and the communicated pipelines are all provided with valves; that is, the first solution heater, the second solution heater and the air heater/cooler are all supplied with hot water from an external heat source, and the activation of each heater is controlled by the valve.
In the heat recovery type fresh air processing system, the first solution heater and the second solution heater are both heating coils;
the air heater/cooler is a heating coil or a cooling coil.
In the heat recovery type fresh air processing system, the first solution circulation pipeline and the second solution circulation pipeline are respectively provided with a solution pump for conveying spraying solution.
In the heat recovery type fresh air processing system, the solution total heat recovery module may include two or more stages of the solution total heat recovery devices.
In the heat recovery type fresh air treatment system, the filler structures in the solution total heat recovery device and the solution humidifying device can be regular fillers or bulk fillers, and the spraying solution is sprayed downwards from the upper part of the filler and is directly contacted with the air entering the filler to carry out heat and mass exchange.
The state change conditions of the air and the solution in the heat recovery type fresh air processing system are as follows:
in the winter operation mode, outdoor fresh air firstly passes through the solution total heat recovery module, then enters the solution humidification module, and finally is treated by the air heater/cooler and then is sent into the room. Ambient hot water provides hot water to the first and second solution heaters and the air heater/cooler, respectively. The first solution heater provides a heat source for the total heat recovery module, and the solution circulating concentration under the condition of extremely low temperature in winter is improved to prevent the risk of solution freezing. The second solution heater provides a heat source for the solution humidifying module, and further humidifies the fresh air passing through the solution total heat recovery module so as to control the humidity (moisture content) of the air; the air heater further heats the fresh air to control the temperature of the fresh air. The treatment process can realize the total heat recovery of indoor exhaust air in winter and can also realize the accurate control of the air supply temperature and the moisture content. And in a summer operation mode, closing valves on a communication pipeline for communicating the first solution heater and the second solution heater with an external heat source, and providing chilled water for the air cooler by external cold water. Outdoor fresh air firstly passes through the solution total heat recovery module to recover cold energy of indoor exhaust air, then enters the air cooler to be further cooled and dehumidified, and then is sent into the room.
The heat recovery type fresh air processing system for severe cold and cold regions has the following advantages:
1) the solution can be utilized to realize a total heat recovery treatment process between fresh air and indoor exhaust air, so that sensible heat and latent heat in the indoor exhaust air are effectively recovered, and the energy consumption in the fresh air treatment process is reduced;
2) when the temperature is lower in winter, the circulating solution of the total heat recovery module can be heated by using a heat source, so that the concentration of the circulating solution is prevented from being too low, the risk of icing is avoided, and the running reliability of the device and the effective performance of a fresh air treatment process are ensured;
3) the solution heater of the total heat recovery module can be adjusted according to the temperature change of outdoor fresh air in winter, the solution heater of the total heat recovery module is turned on when the outdoor fresh air temperature is particularly low and the circulating solution has the risk of icing, and the solution heater of the total heat recovery module is turned off when the outdoor fresh air temperature is not particularly low in winter, so that the normal operation of the heat recovery device can be ensured, and the heat recovery potential in the total heat recovery process can be fully exerted;
4) can satisfy the requirement of annual new trend processing, can realize the total heat recovery between new trend and indoor air exhaust in winter, new trend heating humidification processing, can satisfy the processing demand of summer to the new trend again.
Drawings
FIG. 1 is a schematic view of a heat recovery type fresh air handling system for use in severe cold and cold regions in accordance with the present invention;
the respective symbols in the figure are as follows:
the system comprises a 1, 1 'solution total heat recovery device, a 2 solution humidifying device, a 3 air heating/cooling coil, a 4, 4' solution pump, a 5, 6 solution heating coil and 7, 8, 9 valves.
Detailed Description
The heat recovery type fresh air processing system for severe cold and cold regions according to the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.
Fig. 1 is a schematic diagram of a heat recovery type fresh air processing system for severe cold and cold regions of the present invention, wherein two stages of solution total heat recovery devices 1 and 1' of fresh air and exhaust air are arranged on the left side, a solution humidifying device 2 is arranged on the right side to further humidify the fresh air so as to control the humidity of the fresh air, and an air heating coil 3 is arranged on the right side to further heat the fresh air so as to control the temperature of the fresh air, thereby achieving the purpose of accurately controlling the temperature and humidity of the supplied air. The straight lines in the figure represent the spray solution within each stage and the dotted lines represent the external cold/hot water.
As shown in fig. 1, the heat recovery type fresh air processing system for severe cold and cold regions provided by the present invention comprises a solution total heat recovery module, a solution humidification module and an air heating coil 3 (air cooling coil 3); wherein, the solution total heat recovery module includes two-stage solution total heat recovery device 1 and 1 ', every level solution total heat recovery device 1 and 1 ' includes upper solution total heat recovery device and lower floor solution total heat recovery device, the solution that sprays in upper solution total heat recovery device and the lower floor solution total heat recovery device circulates through first solution circulation pipeline (not marked in the figure), be equipped with first solution heating coil 6 on the first solution circulation pipeline, and locate upper portion of upper solution total heat recovery device, this first solution heating coil 6 provides the heat source for total heat solution recovery device 1 and 1 ', improve solution circulating concentration under the extremely low temperature condition in winter, prevent the frozen risk of solution. Solution pumps 4 and 4' for pumping spraying solution are also arranged on the first solution circulating pipeline. The solution humidifying module comprises a solution humidifying device 2, the spraying solution in the solution humidifying device 2 circulates through a second solution circulating pipeline (not shown in the figure), a second solution heating coil 5 is arranged on the second solution circulating pipeline and arranged at the upper part of the solution humidifying device 2 to provide a heat source for the solution humidifying device 2, and fresh air passing through the solution total heat recovery devices 1 and 1' is further humidified to control the humidity (moisture content) of the air. And a solution pump 4' for pumping the spraying solution is also arranged on the second solution circulating pipeline. Air heating coil 3 further heats the new trend to the temperature of control new trend. The fresh air pipeline sequentially flows through the lower-layer solution total heat recovery device, the solution humidifying device 2 and the air heating coil 3 (air cooling coil 3), and the exhaust air flows through the upper-layer solution total heat recovery device.
In the heat recovery type fresh air processing system, the first solution heating coil 6, the second solution heating coil 5 and the air heating coil 3 are all communicated with a heat source (external hot water), and valves 9, 8 and 7 are arranged on communicated pipelines, and each heating coil is controlled by the valve.
With reference to fig. 1, the state changes of the air and the solution in the heat recovery type fresh air processing system during operation are analyzed.
The state change conditions of the air and the solution in the heat recovery type fresh air processing system in winter are as follows:
fresh air firstly enters a lower-layer device in the first-stage solution total heat recovery device 1, is heated and humidified by a higher-temperature dilute solution sprayed from top to bottom in the device, and then enters a lower-layer device in the second-stage solution total heat recovery device 1' to be continuously heated and humidified by the solution. The concentrated and cooled solution is sent to the upper layer devices in the solution total heat recovery devices 1 and 1 ' by the solution pumps 4 and 4 ' to be directly contacted with exhaust air for heat and mass exchange, the heat and humidity in the exhaust air is absorbed, diluted and heated, and then the solution returns to the lower layer devices in the solution total heat recovery devices 1 and 1 ', the heat and humidity is transferred to fresh air, and the whole total heat recovery cycle process is completed. In consideration of the outdoor temperature conditions in winter in severe cold and cold regions, the solution circulating concentration needs to be increased in order to prevent the solution from freezing, so that the spraying solution entering the upper device in the first-stage solution total heat recovery device 1 is preheated first, and the required heat is provided by the solution heating coil 6. Enter solution humidification device 2 then with the new trend of exhausting through total heat recovery process, further the humidification by the high temperature solution that sprays in solution humidification device 2 to reach the required humidity of air supply. The solution pump 4 "maintains the spray solution state for the solution humidification device 2 by providing the required heat from the solution heating coil 5 through the solution heating coil 5 before sending the solution into the upper portion of the solution humidification device 2 for spraying. The fresh air then enters the air heating coil 3 to be further heated so as to reach the temperature required by air supply and maintain the constant-temperature and constant-humidity air supply state.
The state change conditions of the air and the solution in the heat recovery type fresh air processing system in summer are as follows:
since there is no risk of solution freezing and no additional solution humidification module is required, the valves 9 and 8 and the solution pump 4 "are closed and only the two-stage solution total heat recovery device 1 (1') and the solution cooling coil 3 are operated. After the fresh air and the exhaust air are subjected to two-stage solution total heat recovery, the fresh air and the exhaust air enter the air cooling coil 3, are dehumidified and cooled by the chilled water in the air cooling coil 3, and are sent into a room.
The control process of the fresh air processing flow is as follows: and (4) closing the valves 9 and 8 and the solution pump 4' in summer, and controlling the air supply parameters by controlling the flow of the external cold water. The valves 9 and 8 and the solution pump 4' are opened in winter, and the flow of hot water entering the solution heating coil 6 is controlled through the valve 9, so that the concentration of the circulating solution is changed, and the risk of icing is avoided. I.e. when the outdoor temperature is below a certain lower limit value in winter, the valve 7 is opened and adjusted. The flow of hot water into the solution heating coil 5 is controlled by a valve 8 to achieve the desired supply air moisture content.
Claims (7)
1. A heat recovery type fresh air processing system for severe cold and cold regions comprises a solution total heat recovery module, a solution humidification module and an air heater/cooler;
the solution total heat recovery module comprises at least one stage of solution total heat recovery device, each stage of solution total heat recovery device comprises an upper layer solution total heat recovery device and a lower layer solution total heat recovery device, and the upper layer solution total heat recovery device and the spray solution in the lower layer solution total heat recovery device circulate through a first solution circulation pipeline;
the solution humidifying module comprises a solution humidifying device, and the spraying solution in the solution humidifying device circulates through a second solution circulating pipeline; a second solution heater is arranged on the second solution circulating pipeline;
the fresh air pipeline sequentially flows through the lower-layer solution total heat recovery device, the solution humidifying device and the air heating/cooling device;
exhaust air flows through the upper solution total heat recovery device.
2. The heat recovery type fresh air handling system according to claim 1, wherein: and a first solution heater is arranged on the first solution circulating pipeline.
3. The heat recovery type fresh air handling system according to claim 2, wherein: the first solution heater is arranged at the upper part of the upper-layer solution total heat recovery device;
the second solution heater is arranged at the upper part of the solution humidifying device.
4. A heat recovery type fresh air handling system according to claim 2 or 3, wherein: the first solution heater, the second solution heater and the air heater/cooler are all communicated with a heat source, and the communicated pipelines are all provided with valves.
5. A heat recovery type fresh air handling system according to any one of claims 2 to 4, wherein: the first solution heater and the second solution heater are both heating coils;
the air heater/cooler is a heating coil or a cooling coil.
6. A heat recovery type fresh air handling system according to any one of claims 1 to 5, wherein: and solution pumps are arranged on the first solution circulating pipeline and the second solution circulating pipeline respectively.
7. The heat recovery type fresh air handling system according to any one of claims 1 to 6, wherein: the solution total heat recovery module comprises two stages of solution total heat recovery devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811518027.4A CN111306653A (en) | 2018-12-12 | 2018-12-12 | Heat recovery type fresh air processing system for severe cold and cold regions |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811518027.4A CN111306653A (en) | 2018-12-12 | 2018-12-12 | Heat recovery type fresh air processing system for severe cold and cold regions |
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| CN111306653A true CN111306653A (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811518027.4A Pending CN111306653A (en) | 2018-12-12 | 2018-12-12 | Heat recovery type fresh air processing system for severe cold and cold regions |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113532096A (en) * | 2021-05-24 | 2021-10-22 | 广东省现代农业装备研究所 | Integrated method for heating and humidifying fresh air and removing impurities through exhaust |
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| CN1693779A (en) * | 2005-05-31 | 2005-11-09 | 清华大学 | Fresh air treatment system having solution full heat recovery device |
| CN102175054A (en) * | 2011-02-21 | 2011-09-07 | 黄真银 | Efficient heat pump full-heat recovery solution-type new fan and energy regulating method thereof |
| CN202853011U (en) * | 2012-11-07 | 2013-04-03 | 刘拴强 | Total heat recovery type heating humidifying fresh air handling unit |
| CN202853010U (en) * | 2012-11-07 | 2013-04-03 | 刘拴强 | Fresh air humidification air-conditioner unit |
| US20160290666A1 (en) * | 2011-09-02 | 2016-10-06 | Nortek Air Solutions Canada, Inc. | Energy exchange system for conditioning air in an enclosed structure |
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2018
- 2018-12-12 CN CN201811518027.4A patent/CN111306653A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1693779A (en) * | 2005-05-31 | 2005-11-09 | 清华大学 | Fresh air treatment system having solution full heat recovery device |
| CN102175054A (en) * | 2011-02-21 | 2011-09-07 | 黄真银 | Efficient heat pump full-heat recovery solution-type new fan and energy regulating method thereof |
| US20160290666A1 (en) * | 2011-09-02 | 2016-10-06 | Nortek Air Solutions Canada, Inc. | Energy exchange system for conditioning air in an enclosed structure |
| CN202853011U (en) * | 2012-11-07 | 2013-04-03 | 刘拴强 | Total heat recovery type heating humidifying fresh air handling unit |
| CN202853010U (en) * | 2012-11-07 | 2013-04-03 | 刘拴强 | Fresh air humidification air-conditioner unit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113532096A (en) * | 2021-05-24 | 2021-10-22 | 广东省现代农业装备研究所 | Integrated method for heating and humidifying fresh air and removing impurities through exhaust |
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Application publication date: 20200619 |
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