CN101876469A - Heat pump coupling contraflow type liquid-desiccant central ventilation system and control method thereof - Google Patents
Heat pump coupling contraflow type liquid-desiccant central ventilation system and control method thereof Download PDFInfo
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Abstract
A heat pump coupling contraflow type liquid-desiccant central ventilation system and control method thereof comprise a heat pump system and a liquid-desiccant and fresh air regeneration processing system, wherein the heat pump system comprises a compressor, a four-way directional control valve, a condenser, an evaporator and a throttle member; the liquid-desiccant and fresh air regeneration processing system comprises a fresh air processing module, a liquid regeneration module, a heat exchanger and a liquid pump; both the fresh air processing module and the liquid regeneration module are serially connected with the pipes by the two liquid heat exchangers through a liquid pool. The fresh air processing module is arranged in an indoor air inlet; the liquid regeneration module is arranged in an indoor air outlet to recycle the energy of the indoor exhaust wind. The invention adopts liquid-desiccant to process the fresh air of the air conditioner and removes the dust and the bacteria in the air through spraying the liquid so as to purify the air. The system can recycle the energy of the indoor exhaust wind, which reduces the energy for processing the fresh air; the heat pump is used for providing energy for the liquid to make use of the low-grade heat source.
Description
Technical field
The present invention relates to a kind of solution dehumidification VMC, particularly a kind of heat pump coupling contraflow type liquid-desiccant central ventilation system and control method thereof.
Background technology
China's civil buildings air-conditioning system mostly adopts new return air mixed mode, because most of air is in indoor circulation, being discharged to of making that pollutant can not be very fast is outdoor, harm humans health.Strengthen the resh air requirement method of operation of brand-new wind (or adopt), can indoor harmful substance dilute and discharge outdoorly, obviously improve indoor air quality.But then, the increase of resh air requirement makes new wind handle energy consumption increases greatly.To the at present freeze drying modes that adopt of processing mode of air, there is the drawback of the following aspects in this air conditioning mode: one, need drop to dew-point temperature to air, be lower than the requirement of indoor air-supply, need heat again, cause heat loss more in addition; Two, for lower refrigerant temperature is provided, need lower evaporating temperature, the efficient of refrigeration machine is also decreased; Three, be difficult to adapt to the variation of heat moisture ratio.Air is cooled off and dehumidify by condensing mode, the sensible heat of its absorption and latent heat are than can only changing in certain scope, and the heat moisture ratio of building actual needs changes in the larger context.Generally be the control of sacrificing, compromise, cause the too high or too low phenomenon of indoor relative humidity by the requirement of only satisfying indoor temperature to humidity; Four, because of the existence of condensed water, the surface of coil pipe has formed the hotbed that grows various moulds, has worsened indoor air quality, causes multiple Cure of Sick Building Syndrome.
With professor Jiang Yi is the Tsing-Hua University and the units concerned of representative, and system development goes out humiture independence control air conditioner system, and it basic composition is: handle the system and the system that handles latent heat of sensible heat, two system's independent regulation are temperature and the humidity in the control room respectively.Handle the system of sensible heat because the temperature of its water supply is higher than the dew-point temperature of room air, thereby do not have the danger of dewfall.The fresh air processor group is born simultaneously and is removed indoor CO2, peculiar smell as the system that handles latent heat, to guarantee the task of IAQ.
In the humiture independence control air conditioner system, need the fresh air processor group that dry outdoor new wind is provided, to satisfy hydrofuge, row CO2, to arrange the demand of distinguishing the flavor of and fresh air being provided.Adopting the rotary wheel dehumidifying mode, is a kind of possible solution route, promptly is attached to the wheel surface that aglite is made with hygroscopic materials such as silica gel, molecular sieves.But the essence that the rotary dehumidifier utilization efficiency of heat energy is low is dehumidifying all is constant-enthalpy process and non-isothermal process with these two processes of regeneration, and psychrometric difference between wheel surface and air and temperature difference are all very inhomogeneous, cause very big irreversible loss.Another dehumidification mode is that air directly contacts (as lithium-bromide solution, lithium chloride solution etc.) with the salting liquid with moisture absorption, airborne steam is absorbed by salting liquid, thereby realize the dehumidifying of air, the salting liquid after the moisture absorption need concentrate regeneration and just can reuse.Adopt the solution moisture absorption, can make air solution contact surface simultaneously as heat exchange surface, the opposite side on the surface inserts cold water or hot water, realizes the purpose of the absorption or the additional heat of transformation, thereby realizes moisture absorption and regenerative process near isothermal; Can also adopt the wet crosspoint of solution air heat that has Intermediate Heat Exchanger.Be cross-current between solution and the water, if the internal circulating load of solution is enough big in the unit, the humidity variable quantity of air by such unit again hour, its irreversible loss can significantly reduce.
Chinese patent literature CN201047646Y discloses the wet air-conditioning unit of handling respectively of a kind of heat on April 16th, 2008, comprises cooling cycle system and solution regeneration system; Cooling cycle system comprises compressor, Chuan Lian condenser, expansion valve, first and second evaporimeter successively, and be connected four-way change-over valve between compressor, condenser and second evaporimeter; Solution regeneration system comprises concentrated solution container, solution pump, first and second spray equipment, the weak solution collection container of series connection successively, its first spray equipment is arranged on the top of second evaporimeter, the weak solution collection container places the below of second evaporimeter, second spray equipment is arranged on the top of condenser, and the concentrated solution container places the below of condenser.The power consumption of this structure is big, is further improved and perfect.
Summary of the invention
Purpose of the present invention aims to provide a kind of simple and reasonable, heat pump coupling contraflow type liquid-desiccant central ventilation system and control method thereof that energy consumption is low, to overcome weak point of the prior art.
A kind of heat pump coupling contraflow type liquid-desiccant central ventilation system by this purpose design comprises heat pump and solution dehumidification, regeneration fresh air treatment system, and heat pump comprises compressor, four-way change-over valve, condenser, evaporimeter and throttle part; Solution dehumidification, regeneration fresh air treatment system are made up of new wind processing module, solution regeneration module, heat exchanger and solution pump, and its architectural feature is that new wind processing module, solution regeneration module constitute by solution pool and pipeline series connection by two above solution total-heat exchangers.
Described new wind processing module comprises the first solution total-heat exchanger and the second solution total-heat exchanger, and its below is respectively arranged with first solution pool and second solution pool, and the spray head in the first solution total-heat exchanger is communicated with second solution pool by pipeline; The solution regeneration module comprises the 3rd solution total-heat exchanger and the 4th solution total-heat exchanger, and its below is respectively arranged with the 3rd solution pool and the 4th solution pool, and the spray head in the 3rd solution total-heat exchanger is communicated with the 4th solution pool by pipeline.
Described first solution pool is by pipeline and be communicated with through the interior spray head of heat exchanger, condenser and the 4th solution total-heat exchanger successively; The 3rd solution pool is by pipeline and be communicated with through the interior spray head of heat exchanger, evaporimeter and the second solution total-heat exchanger successively.
Described solution pump comprises first solution pump, second solution pump, the 3rd solution pump and the 4th solution pump, be connected to pipeline that first, second, third and fourth solution pool is connected on.
The a interface of described four-way change-over valve is connected with an end of condenser, and the b interface is connected with the exhaust outlet of compressor, and the c interface is connected with the air entry of compressor, and the d interface is connected with an end of evaporimeter; The other end of condenser is connected with the other end of evaporimeter by throttle part.
Also be connected with first magnetic valve between described condenser and the throttle part, the first magnetic valve two ends are parallel with auxiliary condenser, wherein, the end that first magnetic valve is connected with condenser be connected with auxiliary condenser by second magnetic valve; Auxiliary condenser is arranged on the air outlet place of solution regeneration module.
The control method of heat pump coupling contraflow type liquid-desiccant central ventilation system is characterized in that described new wind processing module is arranged on indoor air intake vent place; The solution regeneration module is arranged on indoor exhaust wind mouth place, reclaims the energy of indoor exhaust wind;
When outdoor air is the high temperature humid air, open compressor, a of four-way change-over valve, b interface are communicated with, and c, d interface are communicated with, and the concentrated solution spray that new wind processing module is cooled dehumidifies to the air cooling-down in the inlet chamber; Weak solution after the moisture absorption is heated in condenser, send into the solution regeneration module successively by solution pump, the air of indoor discharge is flowed through and is arranged to auxiliary condenser after the solution regeneration module is heated humidification, and solution is by the preliminary cooling concentration of air draft, and continue through evaporator cools, spray new wind processing module once more, thereby realize circulation.
When outdoor air is the low temperature drying air, open compressor, a of four-way change-over valve, c interface are communicated with, and b, d interface are communicated with, and realize that the function of heat pump evaporimeter and condenser is changed mutually; The heated weak solution spray of new wind processing module is to the atmosphere temperature rising humidification in the inlet chamber; The concentrated solution of taking away behind the part moisture is cooled in condenser (function of evaporimeter when condenser serves as summer operation), send into the solution regeneration module successively by solution pump, the air of the indoor discharge solution regeneration module of flowing through is cooled dehumidifying back row to auxiliary condenser, and solution is tentatively heated dilution by air draft, and continue through evaporimeter (function of condenser when evaporimeter serves as summer operation) heating, spray new wind processing module once more, thereby realize circulation.
When outside air temperature be fit to, when humidity is too high, close compressor, solution carries out full heat exchange with air and the air in outdoor inlet chamber outdoor from indoor discharge by heat exchanger between new wind processing module and solution regeneration module; Malaria is through in the inlet chamber of the spray of the concentrated solution in new wind processing module dehumidifying back, concentrated solution is diluted and spray the solution regeneration module, from the outdoor dry air process solution regeneration module of indoor discharge, and take away moisture in the weak solution, make solution concentration, and spray new wind processing module once more, thereby realize circulation.
When outside air temperature is fit to, humidity is crossed when low, close compressor, solution carries out full heat exchange with air and the air in outdoor inlet chamber outdoor from indoor discharge by heat exchanger between new wind processing module and solution regeneration module; Dry air is through in the inlet chamber of the spray of the weak solution in new wind processing module dehumidifying back, weak solution is concentrated and sprays the solution regeneration module, from the outdoor wet air process solution regeneration module of indoor discharge, makes the solution dilution, and spray new wind processing module once more, thereby realize circulation.
Described auxiliary condenser and condenser are connected in series, and are used to discharge the unnecessary condensation heat of refrigeration system, if the solution concentration of the 3rd solution pool is too high, need first closed electromagnetic valve, and second magnetic valve is opened, and the condensation heat of auxiliary condenser is taken out of outdoor by air draft; If the solution concentration of the 3rd solution pool is lower, then need first magnetic valve is opened, second closed electromagnetic valve, auxiliary condenser is not worked.
The present invention adopts liquid dehumidifying technical finesse air conditioner fresh air, can remove the dust and the bacterium of carrying secretly in the air by the spray of solution, plays the effect that purifies air, and has improved indoor air quality; System can reclaim the energy of indoor exhaust wind, has reduced new wind and has handled energy consumption; Utilize heat pump to provide heat, low taste thermal source is utilized,, help energy-conservation and improve the environmental situation that causes because of fire coal, fuel oil because heat pump can obtain the heat of Duo than drive energy for solution regeneration.
Description of drawings
Fig. 1 is one embodiment of the invention one operation principle schematic diagram.
Fig. 2 is another operation principle schematic diagram of the present invention.
Fig. 3 is the another operation principle schematic diagram of the present invention.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Referring to Fig. 1, this heat pump coupling contraflow type liquid-desiccant central ventilation system comprises heat pump and solution dehumidification, regeneration fresh air treatment system, and heat pump comprises compressor 9, four-way change-over valve 10, condenser 13, evaporimeter 6 and throttle part 8; Solution dehumidification, regeneration fresh air treatment system are made up of new wind processing module, solution regeneration module, heat exchanger 11 and solution pump.
New wind processing module comprises the first solution total-heat exchanger 1 and the second solution total-heat exchanger 4, and the spray head that its below is respectively arranged with in first solution pool 2 and second solution pool, 5, the first solution total-heat exchangers is communicated with second solution pool by pipeline; The solution regeneration module comprises the 3rd solution total-heat exchanger 20 and the 4th solution total-heat exchanger 18, and the spray head that its below is respectively arranged with in the 3rd solution pool 21 and the 4th solution pool 17, the three solution total-heat exchangers is communicated with the 4th solution pool by pipeline.First solution pool 2 is by pipeline and be communicated with through the interior spray head of heat exchanger 11, condenser 13 and the 4th solution total-heat exchanger 18 successively; The 3rd solution pool 21 is by pipeline and be communicated with through the interior spray head of heat exchanger, evaporimeter 6 and the second solution total-heat exchanger 4 successively.
Solution pump comprises first solution pump 7, second solution pump 3, the 3rd solution pump 14 and the 4th solution pump 19, be connected to pipeline that first, second, third and fourth solution pool is connected on.
The a interface of four-way change-over valve 10 is connected with an end of condenser 13, and the b interface is connected with the exhaust outlet of compressor 9, and the c interface is connected with the air entry of compressor, and the d interface is connected with an end of evaporimeter 6; The other end of condenser is connected with the other end of evaporimeter by throttle part 8.Also be connected with first magnetic valve, 12, the first magnetic valve two ends between condenser 13 and the throttle part 8 and be parallel with auxiliary condenser 16, wherein, the end that first magnetic valve is connected with condenser be connected with auxiliary condenser by second magnetic valve 15; Auxiliary condenser is arranged on the air outlet place of solution regeneration module.
The solution regeneration module is arranged in the air draft treatment channel, and new wind processing module is arranged in the new wind treatment channel; Air draft treatment channel and new wind treatment channel lay respectively at the upper and lower.
Among Fig. 1-Fig. 3, dotted line is depicted as the pipeline of carrying refrigerant, and solid line is the pipeline of delivered solution; Being positioned at the other arrow direction of dotted line is the refrigerant flow direction, and being positioned at the other arrow direction of solid line is the flow of solution direction.Air draft refers to from the outdoor air of indoor discharge, and new wind refers to from outdoor and blows toward indoor air.
Its operation principle is:
One, summer operation
Referring to Fig. 1, open solution pump, compressor 9, the a of four-way change-over valve 10, b interface are communicated with, c, d interface are communicated with, the outdoor new wind of high temperature humidity passes through first and second solution total-heat exchanger of two series connection of new wind processing module successively, after the concentrated solution spray dehumidifying of being cooled off, send into indoor again by evaporimeter 6.The heat of transformation that produces when being the absorbent solution moisture absorption with the purpose of evaporimeter 6 cooling concentrated solutions strengthens the solution wettability power.Weak solution after the moisture absorption is heated concentrated in condenser 13, third and fourth solution total-heat exchanger of being sent into two series connection of solution regeneration module by solution pump 7 successively sprays, indoor exhaust wind third and fourth solution total-heat exchanger of flowing through successively, after solution spraying is heated humidification, arrange, and solution is by the air draft cooling concentration to auxiliary condenser 16.Concentrated solution after the regeneration need be through evaporimeter 6 cooling strengthening its wettability power, and the weak solution after the moisture absorption need be through condenser 13 thermal regenerations.By heat exchanger 11, concentrated solution and weak solution are carried out exchange heat each other before entering evaporimeter 6 and condenser 13, and the concentrated solution temperature is reduced, and the weak solution temperature raises.Therefore the concentrated solution after the regeneration returns evaporimeter after heat exchanger 11 coolings.Auxiliary condenser 16 is connected in series with condenser 13, be used to discharge the unnecessary condensation heat of refrigeration system,, need first magnetic valve 12 cuts out if the solution concentration of the 3rd solution pool 21 is too high, second magnetic valve 15 is opened, and the condensation heat of auxiliary condenser is taken out of outdoor by air draft; If the solution concentration of the 3rd solution pool is lower, then need first magnetic valve is opened, second closed electromagnetic valve, auxiliary condenser is not worked.
Concentrated solution in the 3rd solution pool 21 by heat exchanger 11 and evaporimeter 6 coolings after, in new wind processing module, carrying out the wet exchange of heat, the diluted and temperature rising of solution with processed new wind.Solution in first solution pool 2 are condensed after device 13 heating, finish the concentrated regenerative process of solution in the solution regeneration module.Dilutedly link to each other by solution conduit, by the mobile circulation of finishing vaporizer side and condenser side of solution, to keep the concentration difference at two ends with the solution that is concentrated.The refrigerating capacity of evaporimeter is used for the chilling spray dehumidification solution to strengthen its dehumidifying effect, and the heating that the heat exhaust of condenser is used for solution concentrates regeneration.
Two, winter operation
Referring to Fig. 2, open solution pump, compressor 9, a of four-way change-over valve 10, c interface are communicated with, and b, d interface are communicated with (the mutual conversion that four-way change-over valve 10 commutations realize evaporimeter and condenser).The new wind of open-air seasoning, low temperature passes through first and second solution total-heat exchanger of two series connection of new wind processing module successively, by by the weak solution of evaporimeter 6 (function of evaporimeter when condenser serves as summer operation) heating spray, new wind be heated send into behind the humidification indoor.The heat exhaust of evaporimeter 6 be used to heat enter spray equipment solution to strengthen its humidification ability.Concentrated concentrated solution is sent into heat exchanger 11 by the 3rd solution pool 2 by first solution pump 7 and weak solution is carried out exchange heat through spraying, and the concentrated solution temperature reduces, and the weak solution temperature raises.Concentrated solution is after the heat exchanger cooling, return further cooling of condenser 13 (function of evaporimeter when condenser serves as summer operation), the concentrated solution of cooling third and fourth solution total-heat exchanger spray of flowing through successively, carry out the caloic exchange with indoor exhaust wind, solution absorbs the moisture in the air draft and dilutes and become weak solution, and the air draft after the dehumidifying is discharged from outdoor.First magnetic valve 12 is opened, and second magnetic valve 15 cuts out, and auxiliary condenser 16 is not worked.The weak solution of regeneration flows into the 3rd solution pool 21, is sent into heat exchanger 11 heating by the 3rd solution pump 14, turns back to evaporimeter 6 then, so circulation.
Three, the new blower fan group operation of transition season explanation
Referring to Fig. 3, heat pump quits work.Solution new wind processing module and and the solution regeneration module between carry out full heat exchange with air draft and new wind, new wind reclaim be admitted to after the energy of exhaust air indoor.
In spring, moist outdoor new wind passes through first and second solution total-heat exchanger of two series connection of new wind processing module successively, is sent into indoor after the dehumidifying of concentrated solution spray.Weak solution after the moisture absorption is sent into heat exchanger 11 and is carried out heat exchange from the concentrated solution of the 3rd solution pool 21 by first solution pump 7, third and fourth solution total-heat exchanger that enters two series connection of solution regeneration module again sprays, indoor exhaust wind is discharged outdoor after solution spraying is by humidification, and solution is concentrated by air draft.Concentrated solution after the regeneration is got back to the second solution total-heat exchanger 4 through heat exchanger, so circulation.
In autumn, dry outdoor new wind passes through first and second solution total-heat exchanger of two series connection of new wind processing module successively, is sent into indoor behind the weak solution spray humidification.Concentrated solution after concentrating is sent into heat exchanger 11 and is carried out heat exchange from the weak solution of the 3rd solution pool 21 by first solution pump 7, third and fourth solution total-heat exchanger that enters two series connection of solution regeneration module again sprays, indoor exhaust wind is discharged outdoor after solution spraying is dehumidified, and solution is diluted by air draft.Weak solution after the regeneration is got back to the second solution total-heat exchanger 4 through heat exchanger, so circulation.
Claims (8)
1. a heat pump coupling contraflow type liquid-desiccant central ventilation system comprises heat pump, solution dehumidification and regeneration fresh air treatment system, and heat pump comprises compressor (9), four-way change-over valve (10), condenser (13), evaporimeter (6) and throttle part (8); Solution dehumidification, regeneration fresh air treatment system are made up of new wind processing module, solution regeneration module, heat exchanger (11) and solution pump, it is characterized in that new wind processing module, solution regeneration module constitute by solution pool and pipeline series connection by two above solution total-heat exchangers.
2. heat pump coupling contraflow type liquid-desiccant central ventilation system according to claim 1, it is characterized in that described new wind processing module comprises the first solution total-heat exchanger (1) and the second solution total-heat exchanger (4), its below is respectively arranged with first solution pool (2) and second solution pool (5), and the spray head in the first solution total-heat exchanger is communicated with second solution pool by pipeline; The solution regeneration module comprises the 3rd solution total-heat exchanger (20) and the 4th solution total-heat exchanger (18), its below is respectively arranged with the 3rd solution pool (21) and the 4th solution pool (17), and the spray head in the 3rd solution total-heat exchanger is communicated with the 4th solution pool by pipeline.
3. heat pump coupling contraflow type liquid-desiccant central ventilation system according to claim 2 is characterized in that described first solution pool (2) is by pipeline and pass through the interior spray head of heat exchanger (11), condenser (13) and the 4th solution total-heat exchanger (18) successively and be communicated with; The 3rd solution pool (21) is by pipeline and pass through the interior spray head of heat exchanger, evaporimeter (6) and the second solution total-heat exchanger (4) successively and be communicated with.
4. heat pump coupling contraflow type liquid-desiccant central ventilation system according to claim 3, it is characterized in that described solution pump comprises first solution pump (7), second solution pump (3), the 3rd solution pump (14) and the 4th solution pump (19), be connected to pipeline that first, second, third and fourth solution pool is connected on.
5. heat pump coupling contraflow type liquid-desiccant central ventilation system according to claim 4, the a interface that it is characterized in that described four-way change-over valve (10) is connected with an end of condenser (13), the b interface is connected with the exhaust outlet of compressor (9), the c interface is connected with the air entry of compressor, and the d interface is connected with an end of evaporimeter (6); The other end of condenser is connected with the other end of evaporimeter by throttle part (8).
6. heat pump coupling contraflow type liquid-desiccant central ventilation system according to claim 5, it is characterized in that also being connected with first magnetic valve (12) between described condenser (13) and the throttle part (8), the first magnetic valve two ends are parallel with auxiliary condenser (16), wherein, the end that is connected with condenser of first magnetic valve be connected with auxiliary condenser by second magnetic valve (15); Auxiliary condenser is arranged on the air outlet place of solution regeneration module.
7. the control method of heat pump coupling contraflow type liquid-desiccant central ventilation system according to claim 6 is characterized in that described new wind processing module is arranged on indoor air intake vent place; The solution regeneration module is arranged on indoor exhaust wind mouth place, reclaims the energy of indoor exhaust wind;
When outdoor air is the high temperature humid air, open compressor (9), a of four-way change-over valve (10), b interface are communicated with, and c, d interface are communicated with, and the concentrated solution spray that new wind processing module is cooled dehumidifies to the air cooling-down in the inlet chamber; Weak solution after the moisture absorption is heated in condenser (13), send into the solution regeneration module successively by solution pump, the air of indoor discharge is flowed through and is arranged to auxiliary condenser (16) after the solution regeneration module is heated humidification, and solution is by the preliminary cooling concentration of air draft, and continue through evaporimeter (6) cooling, spray new wind processing module once more, thereby realize circulation;
When outdoor air is the low temperature drying air, open compressor, a of four-way change-over valve, c interface are communicated with, and b, d interface are communicated with, and realize that the function of heat pump evaporimeter and condenser is changed mutually; The heated weak solution spray of new wind processing module is to the atmosphere temperature rising humidification in the inlet chamber; The concentrated solution of taking away behind the part moisture is cooled in condenser (13), send into the solution regeneration module successively by solution pump, the air of the indoor discharge solution regeneration module of flowing through is cooled dehumidifying back row to auxiliary condenser, and solution is tentatively heated dilution by air draft, and continue through evaporimeter (6) heating, spray new wind processing module once more, thereby realize circulation;
When outside air temperature be fit to, when humidity is too high, close compressor, solution carries out full heat exchange with air and the air in outdoor inlet chamber outdoor from indoor discharge by heat exchanger between new wind processing module and solution regeneration module; Malaria is through in the inlet chamber of the spray of the concentrated solution in new wind processing module dehumidifying back, concentrated solution is diluted and spray the solution regeneration module, from the outdoor dry air process solution regeneration module of indoor discharge, and take away moisture in the weak solution, make solution concentration, and spray new wind processing module once more, thereby realize circulation;
When outside air temperature is fit to, humidity is crossed when low, close compressor, solution carries out full heat exchange with air and the air in outdoor inlet chamber outdoor from indoor discharge by heat exchanger between new wind processing module and solution regeneration module; Dry air is through in the inlet chamber of the spray of the weak solution in new wind processing module dehumidifying back, weak solution is concentrated and sprays the solution regeneration module, from the outdoor wet air process solution regeneration module of indoor discharge, makes the solution dilution, and spray new wind processing module once more, thereby realize circulation.
8. the control method of heat pump coupling contraflow type liquid-desiccant central ventilation system according to claim 7, it is characterized in that described auxiliary condenser (16) and condenser (13) are connected in series, be used to discharge the unnecessary condensation heat of refrigeration system, if the solution concentration of the 3rd solution pool (21) is too high, need first magnetic valve (12) cuts out, second magnetic valve (15) is opened, and the condensation heat of auxiliary condenser is taken out of outdoor by air draft; If the solution concentration of the 3rd solution pool is lower, then need first magnetic valve is opened, second closed electromagnetic valve, auxiliary condenser is not worked.
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