CN102177825B - Air cooling-dehumidifying method and cooling-dehumidifying air-conditioning system for plant factory - Google Patents
Air cooling-dehumidifying method and cooling-dehumidifying air-conditioning system for plant factory Download PDFInfo
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- CN102177825B CN102177825B CN2011100724546A CN201110072454A CN102177825B CN 102177825 B CN102177825 B CN 102177825B CN 2011100724546 A CN2011100724546 A CN 2011100724546A CN 201110072454 A CN201110072454 A CN 201110072454A CN 102177825 B CN102177825 B CN 102177825B
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/14—Measures for saving energy, e.g. in green houses
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Abstract
The invention discloses an air cooling-dehumidifying method for a plant factory. Two groups of heat exchangers sharing a common air flow channel are arranged in the plant factory; the two groups of heat exchangers are connected in series from front to back in the common air flow channel; for the two groups of heat exchangers, the first heat exchanger is set to be a heating coil which is firstly contacted with air so as to heat the air and the second heat exchanger is set to be a cooling coil which cools and dehumidifies the air at the outlet of the heating coil; and the heat source of the heating coil is the condensation heat of a refrigerating unit in the plant factory or the radiation heat of an artificial light source. The invention solves the difficulties that the existing dehumidifying equipment is poor in dehumidification effect or even can not achieve humidification in the environment with low temperature and high humidity.
Description
Technical field:
The present invention relates to a kind of plant factor air cooling and dehumidifying method and cooling and dehumidifying air-conditioning system, particularly relate to the method for air in closed space cooling and dehumidifying under a kind of low temperature and high relative humidity environment, and realize the air-conditioning system that this method adopts.
Background technology:
" plant factor " is meant through artificial environment control and computerized production management and carries out the annual plant cultivation system of stopping that do not have.Plant cultivating is in the confined space just as the industrial building; Its grow required temperature, humidity, carbonic acid gas, oxygen, fertilizer, nutrient, illumination etc. are all controlled; No longer receive the influence of extraneous climatic environment, have anniversaryization, sophistication, homogenize and characteristics such as yielding ability.
The population report of delivering according to the United Nations estimates, to the year two thousand fifty whole world population will reach 9,300,000,000, if rely on traditional tillage method that depends on sky to receive, present all in the world arable lands almost operate at full capacity, just support more than 60 hundred million present populations reluctantly.So must seek a radical solving method." plant factor " can reach purposes such as high yield, excellent product with the planting type that intensifies most on limited soil, be the developing direction of modern agricultural technology, received the great attention of national governments and each big scientific research institution.
As an important component part of " plant factor ", air handling system is born tasks such as the temperature/humidity regulation of " plant factor " interior air, new wind processing and air cleaning.And the dehumidification of air to handle be a main task of " plant factor " air-conditioning system, in some cases or even top priority.The dehumidification method of air is a lot, like liquid desiccant dehumidification (dehumidification by absorption), solid moisture absorbent dehumidification (absorption dehumidification) and cooling dehumidification etc.
The liquid desiccant dehumidification utilizes the concentrated solution of some salt (such as calcium chloride, lithium chloride etc.) to have strong hygroscopicity to absorb airborne moisture content exactly.The major advantage of the method is that the dehumidification amplitude of air is big, can reach very low water capacity; Can obtain required ventilation state with single dehumidification processing procedure, heat again, avoid the waste of cold and heat and need not to cool air to earlier dew point.But this method needs the reclaim equiment of a cover saline solution, and is big like indoor waste heat amount, also needs a cover cooling system, and systematic comparison is complicated, and it is big to take up room; Need resolve the anticorrosion problem of equipment in addition.So be not suitable for " plant factor " such occasion.
The solid moisture absorbent dehumidification utilizes some solid material (such as silica gel, calcium chloride etc.) to have strong hygroscopicity to absorb airborne moisture content exactly.The method need be regenerated and cooling system equally.Though the rotary wheel dehumidifying function realizes the continuous operation of moisture absorption and regeneration, its operation energy consumption is higher, has infiltration between dehumidified air and the regeneration air.Be not suitable for " plant factor " such occasion yet.
Humid air is cooled,, just have moisture content and separate out, the principle of cooling dehumidification that Here it is when the temperature of humid air is lower than its dew-point temperature.In all heat, device for heat/moist exchange, spray chamber and surface-type heat exchanger are used the widest.The major advantage of spray chamber is can realize the processing procedure of multiple air, have certain ability that purifies air, expend the few and easy processing of amount of metal.But it is to shortcomings such as the hygienic requirements of water quality are high, floor space is big, water system is complicated and consumed power is more.So in the place (like plant factor) that place, aspect such as energy-conservation is had strict demand, it is more extensive that surface-type heat exchanger uses.
Obviously,, in dehumidification, must be accompanied by the attenuating of air themperature, not reduce, then also need a temperature-rise period for keeping air themperature if merely adopt cooling dehumidification process.
Existing a kind of cooling dehumidifying device that is widely used, its operation principle is as shown in Figure 2.The state variation of dehumidification process air is as shown in Figure 3.Need the air elder generation process cooling coil 2 of the state A of dehumidification, because the cold-producing medium heat absorption drops to below the air dew point temperature wall surface temperature of cooling coil, thereby air is lowered the temperature, state B is arrived in dehumidification.The air that leaves cooling coil is warming up to state C through airheater again, and this has just reached the purpose that a dehumidification is not lowered the temperature.Here, cooling coil is done low-temperature receiver 4 with chilled water or cold-producing medium, and for saving the energy, airheater utilizes the condensation heat of air-conditioning unit to add hot-air for thermal source 5.
This cooling dehumidifying device floor space is little, makes ceiling mounting type and can not take the ground useful space fully; Dehumidification is effective, and outlet air temperature is controlled relatively; Utilize condensation heat (heat recovery a kind of), economic operating cost; System is simple, ripe, reliable, use, management, easy to maintenance.
But it also has fatal defective.Because it is indoor surplus wet to adopt the cooling and dehumidifying method to get rid of, the wall surface temperature of cooling coil need be lower than the dew-point temperature of room air.In actual the use, many required dehumidifying under the environment of low temperature and high relative humidity are arranged.Such as totally-enclosed artificial light type plant factor, in the process of growth of plant, can produce a large amount of surplus wetly, even the temperature of air is lower, relative moisture also can be very big.Under this operating mode, carry out cooling and dehumidifying, consider the medium transport temperature difference, require sink temperature very low, can be lower than 0 ℃ when minimum.As use water as refrigerant, can produce the harm of freezing.Can alleviate this problem though add antifreezing agent, antifreezing agent has corrosion to equipment, and the operational management cost also increases.As making refrigerant with cold-producing medium, though there is not the harm of freezing, the wall surface temperature of cooling coil also can be lower than 0 ℃, its surface meeting frosting, and the time one is long, and air flow channel is blocked, and system can't move.Simultaneously, sink temperature reduces, and the Energy Efficiency Ratio of air-conditioning system also reduces.
The theory analysis of this process is as shown in Figure 4.As an example, need supposing the temperature of air of the state A of dehumidification is 16 ℃, relative moisture 60%; Through cooling coil; Because the cold-producing medium heat absorption drops to below the air dew point temperature wall surface temperature of surface cool coil pipe, thereby air is lowered the temperature, state B is arrived in dehumidification; At this moment about 4.5 ℃ of temperature, relative moisture about 90%.Consider heat transfer temperature difference, get Δ t=5 ℃, then sink temperature tw1＜0 ℃.
Summary of the invention:
For overcoming the defective of prior art, the object of the present invention is to provide a kind of plant factor air cooling and dehumidifying method and cooling and dehumidifying air-conditioning system, under any operating mode, can both effectively dehumidify, especially be fit to the dehumidifying operation under the low temperature and high relative humidity environment.
Technical solution problem of the present invention adopts following technical scheme:
A kind of plant factor air cooling and dehumidifying method comprises the steps:
Two groups of heat exchangers with public air flow channel are set in said plant factor, with said two groups of heat exchanger tandem connections in said public air flow channel;
In said two groups of heat exchangers, first heat exchanger is set to heat(ing) coil, its elder generation and air Contact Heating air; Second heat exchanger is set to cooling coil, and the outlet air of said heat(ing) coil is carried out cooling and dehumidifying;
The thermal source of said heat(ing) coil is the condensation heat of refrigeration unit in the plant factor or the heat radiation of artificial light source.
A kind of but dehumidifier/air-conditioning system of realizing said cooling and dehumidifying method comprises:
One air-treatment unit, it has air-treatment unit casing, is located at blower fan, the cooling coil of being located at the blower fan rear end, heat(ing) coil and the air cleaner of an end in the unit casing, also is provided with cooling coil outlet air temperature sensor in the unit casing;
One recovery type heat air-conditioning unit, it has compressor, shell and tube exchanger, heat recovering heat exchanger, air side heat exchanger, reaches axial flow blower;
Said heat recovering heat exchanger is communicated with said heat(ing) coil through the hot water line; And in the hot water line, be provided with hot water circulating pump and hot water flow control valve; Said shell and tube exchanger is communicated with said cooling coil through the chilled water pipeline, and in the chilled water pipeline, is provided with chilled water circulating pump;
One controller, it jointly controls said compressor, chilled water circulating pump, hot water circulating pump, axial flow blower, cooling coil outlet air temperature sensor, hot water flow control valve and is located at temperature sensor, the humidity sensor in the factory building.
Said air-conditioning system also comprises:
Be located at artificial light source, artificial light source heat radiation recover and timing controller in the factory building;
Said timing controller is controlled the open and close of said artificial light source, closes the dark phase of artificial light source as plant growing daytime, opens the photophase of artificial light source as plant growing night;
Said artificial light source heat radiation recover is connected among the said hot water line.
Compared with present technology, beneficial effect of the present invention is embodied in:
1, under the low temperature and high relative humidity environment,, correspondingly can improve the sink temperature of surface cool coil pipe owing to improved the temperature of surface cool coil pipe inlet air.Avoided cooling coil to freeze or the possibility of frosting, the Energy Efficiency Ratio of air-conditioning system also can improve.
2, through changing the heat that adds of heater, can control the outlet air temperature of cooling and dehumidifying equipment easily, realize multiple dehumidification process.
3, effectively utilize the condensation heat of air-conditioning unit and the heat radiation of artificial light source, the heat radiation of use artificial light source has reduced the thermic load of air-conditioning unit on the one hand, has freely used this part heat energy on the other hand, kills two birds with one stone; Use the condensation heat of air-conditioning unit to heat the condensation temperature that has reduced the air-conditioning unit on the one hand, reduce system power dissipation, freely used this part heat energy on the other hand, also kill two birds with one stone.
Description of drawings:
Fig. 1 cools off dehumidification method schematic diagram for the present invention.
Fig. 2 is existing cooling dehumidification method schematic diagram.
Fig. 3 is the i-d figure of existing cooling dehumidifying device air state variation.
Fig. 4 is used for the i-d figure that air condition changes under the low temperature and high relative humidity environment for existing cooling dehumidifying device.
Fig. 5 cools off the i-d figure of dehumidifying device air state variation for the present invention.
Fig. 6 is an air-conditioning system schematic diagram of the present invention.
Label among the figure: 1 heater, 2 cooling coils, 3 public air channels, 4 low-temperature receivers, 5 thermals source, 6 air-treatment units; 61 unit casings, 62 blower fans, 63 cooling coils, 64 heat(ing) coils, 65 air cleaners, 7 hot water lines; 8 chilled water pipelines, 9 hot water circulating pumps, 10 chilled water circulating pumps, 11 recovery type heat air-conditioning units, 111 compressors, 112 shell and tube exchangers; 113 heat recovering heat exchangers, 114 controllers, 115 air side heat exchangers, 116 axial flow blowers, 117 temperature sensors, 118 humidity sensors; 119 cooling coil outlet air temperature sensors, 121 timing controllers, 122 artificial light sources heat radiation recover, 123 artificial light sources, 13 hot water flow control valves.
Below pass through embodiment, and combine accompanying drawing that the present invention is described further.
Embodiment:
Embodiment: referring to Fig. 1, plant factor's air cooling and dehumidifying method of present embodiment is that two groups of heat exchangers with public air channel 3 are set in plant factor, with said two groups of heat exchanger tandem connections in public air channel.
In said two groups of heat exchangers, first heat exchanger is set to heat(ing) coil 1, its elder generation and air Contact Heating air; Second heat exchanger is set to cooling coil 2, and the outlet air of said heat(ing) coil is carried out cooling and dehumidifying.
In the practical application, the thermal source of heat(ing) coil 1 is the condensation heat of refrigeration unit in the plant factor or the heat radiation of artificial light source.
The present invention cools off dehumidification method schematic diagram referring to Fig. 1, and the present invention cools off the variation of dehumidification air-conditioning system air state referring to Fig. 5.The air themperature that needs the state A of dehumidification is 16 ℃, and relative moisture 60%, dew-point temperature are 8.2 ℃.Be warming up to state B through airheater, temperature is about 22 ℃, and dew-point temperature still is 8.2 ℃.Pass through cooling coil again, because the cold-producing medium heat absorption, as long as the wall surface temperature of cooling coil drops to the air dew point temperature below 8.2 ℃, air just can be lowered the temperature, state C is arrived in dehumidification.This has just reached the purpose that a dehumidification is not lowered the temperature.Here, because the inlet temperature of cooling coil improves, sink temperature remains on 3 ℃～7 ℃ and gets final product.This has just solved existing cooling dehumidification method sink temperature problem of lower under the low temperature and high relative humidity environment.Likewise, for saving the energy, airheater utilizes the condensation heat of air-conditioning unit or the heat radiation of artificial light source to add hot-air.
Referring to Fig. 6, realize the cooling and dehumidifying air-conditioning system of present embodiment method, comprising:
One air-treatment unit 6; It has air-treatment unit casing 61, is located at blower fan 62, the cooling coil 63 of being located at the blower fan rear end, heat(ing) coil 64 and the air cleaner 65 of an end in the unit casing, also is provided with cooling coil outlet air temperature sensor 119 in the unit casing;
One recovery type heat air-conditioning unit 11, it has compressor 111, shell and tube exchanger 112, heat recovering heat exchanger 113, air side heat exchanger 115, reaches axial flow blower 116;
Said heat recovering heat exchanger 113 is communicated with said heat(ing) coil 64 through hot water line 7; And in hot water line 7, be provided with hot water circulating pump 9 and hot water flow control valve 13; Said shell and tube exchanger 112 is communicated with said cooling coil 63 through chilled water pipeline 8, and in the chilled water pipeline, is provided with chilled water circulating pump 10;
One controller, it jointly controls said compressor 111, chilled water circulating pump 10, hot water circulating pump 9, axial flow blower 116, cooling coil outlet air temperature sensor 119, hot water flow control valve 13 and is located at temperature sensor 118, the humidity sensor 117 in the factory building.
In specifically being provided with, the thermal source of recovery type heat air-conditioning unit 11 is from the artificial light source of being located in the factory building 123, artificial light source heat radiation recover 122 and timing controller 121; The dark phase of artificial light source as plant growing closed in the open and close of the said artificial light source 123 of said timing controller 121 controls daytime, opens the photophase of artificial light source as plant growing night; Said artificial light source heat radiation recover 122 is connected among the said hot water line 7.
The control procedure of this system is following:
In the course of work, the blower fan 62 of air-treatment unit 6 is opened all the time, and temperature sensor 117 detects indoor temperature, and humidity sensor 118 detects indoor humidity, and cooling coil outlet air temperature sensor 119 detects cooling coil 63 leaving air temps.
When indoor temperature greater than design temperature, humidity is greater than setting humidity, compressor 111, axial flow blower 116, chilled water circulating pump 10 are opened, hot water circulating pump 9, hot water flow control valve 13 are closed, system's operation cool-down dehumidification pattern.
When indoor temperature equals design temperature; Humidity is greater than setting humidity; Compressor 111, axial flow blower 116, chilled water circulating pump 10, hot water circulating pump 9, hot water flow control valve 13 are all opened; The aperture of the rotating speed of axial flow blower 116, hot water flow control valve 13 is regulated according to cooling coil 63 leaving air temps, makes cooling coil 63 leaving air temps equal design temperature, system's operation isothermal dehumidifying pattern.
When indoor temperature less than design temperature; Humidity is greater than setting humidity, and compressor 111, chilled water circulating pump 10, hot water circulating pump 9, hot water flow control valve 13 are all opened, and axial flow blower 116 is closed; The aperture of hot water flow control valve 13 is maximum, system's operation intensification dehumidification mode.
When indoor temperature is less than or equal to design temperature; Humidity is less than or equal to setting humidity; Compressor 111, axial flow blower 116, chilled water circulating pump 10, hot water circulating pump 9, hot water flow control valve 13 are all closed, and recovery type heat air-conditioning unit 11 is in holding state.
Claims (2)
1. plant factor's air cooling and dehumidifying air-conditioning system is characterized in that, comprising:
One air-treatment unit (6); It has air-treatment unit casing (61), is located at blower fan (62), the cooling coil (63) of being located at the blower fan rear end, heat(ing) coil (64) and the air cleaner (65) of an end in the unit casing, also is provided with cooling coil outlet air temperature sensor (119) in the unit casing;
One recovery type heat air-conditioning unit (11), it has compressor (111), shell and tube exchanger (112), heat recovering heat exchanger (113), air side heat exchanger (115), reaches axial flow blower (116);
Said heat recovering heat exchanger (113) is communicated with said heat(ing) coil (64) through hot water line (7); And in hot water line (7), be provided with hot water circulating pump (9) and hot water flow control valve (13); Said shell and tube exchanger (112) is communicated with said cooling coil (63) through chilled water pipeline (8), and in the chilled water pipeline, is provided with chilled water circulating pump (10);
One controller, it jointly controls said compressor (111), chilled water circulating pump (10), hot water circulating pump (9), axial flow blower (116), cooling coil outlet air temperature sensor (119), hot water flow control valve (13) and is located at temperature sensor (118), the humidity sensor (117) in the factory building.
2. a kind of plant factor according to claim 1 air cooling and dehumidifying air-conditioning system is characterized in that said air-conditioning system also comprises:
Be located at artificial light source (123), artificial light source heat radiation recover (122) and timing controller (121) in the factory building;
Said timing controller (121) is controlled the open and close of said artificial light source (123), closes the dark phase of artificial light source as plant growing daytime, opens the photophase of artificial light source as plant growing night;
Said artificial light source heat radiation recover (122) is connected among the said hot water line (7).
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| CN108755833A (en) * | 2018-08-23 | 2018-11-06 | 成都市孔宣农业科技有限公司 | A kind of recovery method and system of plant moisture |
| CN109945316B (en) * | 2019-03-19 | 2020-11-27 | 北京百度网讯科技有限公司 | Temperature adjusting device for air conditioning dehumidification |
| CN110006103B (en) * | 2019-04-01 | 2023-10-03 | 广州百立可科技有限公司 | Temperature and humidity adjusting method |
| CN110367001A (en) * | 2019-07-03 | 2019-10-25 | 江苏盐西高新科技园投资有限公司 | Cooling device is used in a kind of plantation of polyhouse-based agriculture |
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Address after: 239000 Chengdong Industrial Zone, Anhui City, Chuzhou Province Patentee after: Anhui Yangzi Air Conditioning Co., Ltd Address before: 239000 Chengdong Industrial Zone, Anhui City, Chuzhou Province Patentee before: CHINA YANGZI GROUP CHUZHOU YANGZI AIR CONDITIONER Co.,Ltd. |