CN109899920A - Central Heating Providing system in a kind of closed loop double-pump type preheating moist chamber - Google Patents
Central Heating Providing system in a kind of closed loop double-pump type preheating moist chamber Download PDFInfo
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- CN109899920A CN109899920A CN201910258278.1A CN201910258278A CN109899920A CN 109899920 A CN109899920 A CN 109899920A CN 201910258278 A CN201910258278 A CN 201910258278A CN 109899920 A CN109899920 A CN 109899920A
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Abstract
The invention discloses Central Heating Providing system in a kind of closed loop double-pump type preheating moist chamber, including the outer cabinet of preheating, the outer cabinet that dehumidifies, cabinet, main condenser, auxiliary condenser, main evaporator, auxiliary evaporator, main compressor, auxiliary compressor, main check valve, auxiliary check valve, air inlet/outlet waste-heat recovery device and vav terminal heating installation in heating.Using three cabinet double pump double-refrigerant loop configurations, outer cabinet is preheated first to preheat outdoor clammy air, improve dew point, then it is dehumidified again by the outer cabinet that dehumidifies, just it can reach good removal moisture drying effect, and relatively high temperature can also be retained, it is heated, is improved efficiency and heat utilization efficiency convenient for cabinet in heating.
Description
Technical field
The present invention relates to a kind of air-conditioning system, in particular to Central Heating Providing system in a kind of closed loop double-pump type preheating moist chamber
System.
Background technique
Collective's supply line heating, heating system are not the electricity heating heating integrated in air-conditioning in south at present, be that is to say
Heating mode in air conditioner.Traditional air conditioner for both cooling and heating, when refrigeration, gaseous refrigerant compression is by compressor
The gaseous refrigerant of high temperature and pressure is then delivered to the liquid refrigerant after condenser (outdoor unit) heat dissipation as normal temperature high voltage, institute
What is produced by boasting with outdoor unit is hot wind.Then capillary is arrived, into evaporator (indoor unit), since refrigerant is reached from capillary
Space increases suddenly after evaporator, and pressure reduces, and the refrigerant of liquid will vaporize, and becomes the refrigerant of gaseous state low temperature, thus
A large amount of heat is absorbed, evaporator will turn cold, and the fan of indoor unit blows over indoor air from evaporator, so indoor
What machine was produced by boasting is exactly cold wind；Water vapour in air will condense into water droplet after encountering cold evaporator, flow out along water pipe
The reason of going, being discharged here it is air-conditioning.When heating, there is the component for being four-way valve, make refrigerant condenser with
On the contrary, what indoor unit was blown is hot wind so what is blown outside room when heating is cold wind when the flow direction of evaporator and refrigeration.It passes
The cold-hot dual-purpose air-conditioning of system is applied to the heating of southern winter-spring season and is primarily present following deficiency, since indoor and outdoor machine is opposite
Independent operating, therefore, when heating is only merely evaporator (heating mode of the fan of indoor unit by indoor air from indoor unit
Condenser effect) in blow over heating after blow into interior again, interior circulating-heating heating, and southern Winter-Spring day be it is clammy even with
Plum rains, air is extremely moist, the air heating of interior circulation, in addition to do not have fresh air come in cause it is bored other than, can also produce
Raw damp and hot phenomenon, it is still moist although room temperature is up, allow people to feel very uncomfortable, and temperature is higher, water
Point high air of content will adhere into droplet encountering low temperature object (such as floor, desktop even bedding), generate Hui Nan
Its phenomenon.Therefore, it is necessary to a kind of special heating system be designed, using outer circulation mode, three cabinets operation, effectively to outdoor
The fresh clammy air come in carries out carrying out heating through indoor unit again after removal moisture drying.
Summary of the invention
The present invention provides Central Heating Providing system in a kind of closed loop double-pump type preheating moist chamber, realizes the heating of outer circulation mode,
And effectively outdoor clammy air reheat after removal moisture drying, to indoor supply fresh dried heating, and it is right
Waste heat in the old gas of discharge is utilized, and is more energy-saving and environmentally friendly.
In order to solve the above-mentioned technical problems, the present invention provides the following technical solutions:
Central Heating Providing system in a kind of closed loop double-pump type preheating moist chamber, including the outer cabinet of preheating, the outer cabinet that dehumidifies, machine in heating
Case, main condenser, auxiliary condenser, main evaporator, auxiliary evaporator, main compressor, auxiliary compressor, main check valve, auxiliary check valve, into
Outlet air waste-heat recovery device and vav terminal heating installation, which is characterized in that the outer cabinet of the preheating, the outer cabinet installation of dehumidifying
In outdoor, and it is respectively arranged with preheating ventilating duct, dehumidifying ventilating duct, cabinet is installed indoors in the heating, and is provided with system
Hot ventilating duct, the preheating ventilating duct, dehumidifying ventilating duct with heat ventilating duct be sequentially connected by flexible thermal insulation pipeline it is logical, it is described
The air outlet of preheating ventilating duct, dehumidifying ventilating duct and heating ventilating duct is provided with induced draft fans；The auxiliary condenser is arranged pre-
The preheating ventilating duct middle section of the outer cabinet of heat, the leading portion of the dehumidifying ventilating duct of the outer cabinet of dehumidifying is arranged in the auxiliary evaporator, described
Auxiliary compressor, auxiliary check valve are connected with auxiliary condenser, auxiliary evaporator respectively, form auxiliary compressor to auxiliary condenser to auxiliary unidirectional
The refrigerant of valve to auxiliary evaporator flows to circulation, and the heating ventilating duct middle section for heating interior cabinet is arranged in the main condenser, described
Main evaporator is arranged in the back segment of the ventilating duct that dehumidifies of the outer cabinet of dehumidifying, the main compressor, main check valve respectively with main condenser
Device, main evaporator are connected, and form refrigerant of the main compressor to main condenser to main check valve to main evaporator and flow to circulation；Institute
State air inlet/outlet waste-heat recovery device include indoor old wind wind pipe, outdoor fresh air intake stack, air-out fan, air inlet fan and
Old wind wind pipe indoors, outdoor fresh air intake stack is respectively set in heat exchange grid, the air-out fan, air inlet fan
The air opening end and outdoor fresh air blast pipe of old wind wind pipe indoors is arranged in air outlet and air inlet, the heat exchange grid
The air inlet end in road, the outdoor fresh air intake stack are connected with the fresh air air inlet for preheating outer cabinet, the old wind in interior
Wind pipe is connected with indoor old wind air outlet；So that being first passed through after outdoor fresh air is entered by outdoor fresh air intake stack
Heat exchange grid is after obtaining waste heat in the old wind that indoor old wind wind pipe is gone out, into the preheating ventilation for preheating outer cabinet
Road, is preheated under the action of auxiliary condenser, the dehumidifying ventilating duct for the outer cabinet that dehumidifies then is entered back into, in the auxiliary evaporation of leading portion
Under the action of device carry out first segment dehumidifying, then again under the action of the main evaporator of back segment carry out second segment dehumidifying, then again into
The heating ventilating duct for entering cabinet in heating, is heated under the action of main condenser, is obtained dry heating, is then passed through change again
Air quantity end heating installation enters interior, heats to interior, and the old wind eventually formed is passed through by indoor old wind air outlet
Indoor old wind wind pipe is discharged to outdoor；The vav terminal heating installation is by flexible thermal insulation pipeline and heats interior cabinet
The air outlet of heating ventilating duct be connected, the inner passage of the vav terminal heating installation is provided with electricity auxiliary heating
Device, and electric heating device (interior mechanism heat is heated by control, it is bad to be precisely controlled temperature, therefore joined the auxiliary hot heater of electricity
Aids in temperature control is carried out, precision is higher；Therefore, heat in machine be slightly to control, electric heating device is smart control) rear be provided with it is complete
The rear of hosted-type air velocity transducer and temperature sensor, Pitot tubular type air velocity transducer and temperature sensor is provided with air quantity tune
Valve is saved, which is connected with air-valve driver.
Further, the vav terminal heating installation further includes temperature and blast volume controller, the temperature and Boiler pressure control
Device is connected with Pitot tubular type air velocity transducer, temperature sensor, electric heating device and air-valve driver respectively.
Further, seamed type air diffuser is arranged in the end of the inner passage of the air quantity variable end device.
Further, the volume damper is solenoid valve.
Further, the seam type air diffuser is set to indoor top, and the old wind air outlet is set to indoor bottom.
The beneficial effects obtained by the present invention are as follows being:
One, it using three cabinet double pump double-refrigerant loop configurations, preheats outer cabinet and is preheated, the outer cabinet that dehumidifies dehumidifies, and makes
Cabinet is heated in heat, herein it is emphasized that if using double case (i.e. outdoor unit, indoor unit) constructions, outdoor unit is straight
Connect and dehumidify to outdoor clammy air, effect on moisture extraction is very poor because outdoor clammy air be originally temperature it is extremely low and
And moisture content is high, therefore dew point is lower, and it is dry to be not easy pre- cold junction liquid；If it have to dry, outdoor unit just needs lower
Temperature, air by dehumidifying after temperature become lower, be unfavorable for the heating of indoor unit；And after using three box structures,
It preheats outer cabinet first to preheat outdoor clammy air, improves dew point, then dehumidified again by the outer cabinet that dehumidifies, just
Good removal moisture drying effect can be reached, and relatively high temperature can also be retained, heated, mentioned convenient for heating interior cabinet
High efficiency and heat utilization efficiency.For example, outdoor clammy 10 DEG C of air themperature, general 13 DEG C after air inlet/outlet waste-heat recovery device,
It is 15 DEG C general after the outer cabinet that dehumidifies (to be higher by 5 DEG C of left sides than outdoor clammy air themperature general 18 DEG C after preheating outer cabinet
It is right), therefore, the presence of three casing structures can effectively improve dehumidifying heating effect.
Two, outer cabinet, the outer cabinet of dehumidifying, cabinet through type connection construction in heating, comprehensive raising Central Heating Providing system are preheated
The operational efficiency of system, thermal losses is low, and dry heating effect is good.
Three, using air inlet/outlet waste-heat recovery device, the waste heat in discharge exhaust gas is made full use of, pre-heat effect is improved.
Four, it using vav terminal heating installation, is precisely controlled since the interior cabinet of heating itself is not easy to do to heating temperature,
Moreover, air after cabinet heating in heating there are also could be discharged indoors by certain pipeline, during this
There is also the Dissipation changes of temperature, and therefore, vav terminal heating installation can effectively pass through the auxiliary hot heater of electricity and wind
The cooperation of adjustable valve carries out aids in temperature control, improves the accuracy of leaving air temp.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is overall structure diagram of the invention；
Fig. 2 be the outer cabinet of preheating, the outer cabinet that dehumidifies, in heating cabinet fit structure schematic diagram；
Fig. 3 is the structural schematic diagram of air inlet/outlet waste-heat recovery device；
Fig. 4 is the structural schematic diagram of vav terminal heating installation；
In figure: the outer cabinet 1 of preheating；Dehumidify outer cabinet 2；Cabinet 3 in heating；Main condenser 4；Auxiliary condenser 5；Main evaporator 6；It is auxiliary
Evaporator 7；Main compressor 8；Auxiliary compressor 9；Main check valve 10；Auxiliary check valve 11；Air inlet/outlet waste-heat recovery device 12；Variable air rate
End heating installation 13；There is preheating ventilating duct 14；Dehumidify ventilating duct 15；Heat ventilating duct 16；Flexible thermal insulation pipeline 17；Exhausting wind
Machine 18；Indoor old wind wind pipe 19；Outdoor fresh air intake stack 20；Air-out fan 21；Air inlet fan 22；Heat exchange grid
23；Electric heating device 24；Pitot tubular type air velocity transducer 25；Temperature sensor 26；Volume damper 27；Air-valve driver
28；Temperature and blast volume controller 29；Seam type air diffuser 30.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings, it should be understood that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
Embodiment 1
As shown in Figs 1-4, Central Heating Providing system in present invention offer closed loop double-pump type preheating moist chamber, including the outer cabinet 1 of preheating,
Dehumidify outer cabinet 2, the interior cabinet 3 of heating, main condenser 4, auxiliary condenser 5, main evaporator 6, auxiliary evaporator 7, main compressor 8, auxiliary
Compressor 9, main check valve 10, auxiliary check valve 11, air inlet/outlet waste-heat recovery device 12 and vav terminal heating installation 13；It is described
The outer cabinet 1 of preheating, the outer cabinet 2 of dehumidifying are mounted on outdoor, and are respectively arranged with preheating ventilating duct 14, dehumidifying ventilating duct 15, described
Cabinet 3 is installed indoors in heating, and is provided with heating ventilating duct 16, the preheating ventilating duct 14, dehumidifying ventilating duct 15 and system
Hot ventilating duct 16 by flexible thermal insulation pipeline 17 be sequentially connected it is logical, the preheating ventilating duct 14, dehumidifying ventilating duct 15 and heating lead to
The air outlet in air duct 16 is provided with induced draft fans 18；The auxiliary condenser 5 is arranged in the preheating ventilating duct 14 for preheating outer cabinet 1
The leading portion of the dehumidifying ventilating duct 15 of the outer cabinet 2 of dehumidifying, the auxiliary compressor 9, auxiliary check valve is arranged in section, the auxiliary evaporator 7
11 are connected with auxiliary condenser 5, auxiliary evaporator 7 respectively, formation auxiliary compressor 9 to auxiliary condenser 5 to auxiliary check valve 11 to auxiliary steaming
The refrigerant for sending out device 7 flows to circulation, and 16 middle section of heating ventilating duct for heating interior cabinet 3, the main steaming is arranged in the main condenser 4
The back segment of the dehumidifying ventilating duct 15 of the outer cabinet 2 of dehumidifying is arranged in hair device 6, and the main compressor 8, main check valve 10 are cold with master respectively
Condenser 4, main evaporator 6 are connected, and form refrigerant stream of the main compressor 8 to main condenser 4 to main check valve 10 to main evaporator 6
To circulation；The air inlet/outlet waste-heat recovery device 12 includes indoor old wind wind pipe 19, outdoor fresh air intake stack 20, outlet air
Fan 21, air inlet fan 22 and heat exchange grid 23, the air-out fan 21, air inlet fan 22 are respectively set old wind indoors and go out
The air outlet and air inlet of air piping 19, outdoor fresh air intake stack 20, old wind goes out indoors for the setting of heat exchange grid 23
The air opening end of air piping 19 and the air inlet end of outdoor fresh air intake stack 20, the outdoor fresh air intake stack 20 and preheating
The fresh air air inlet of outer cabinet 1 is connected (air enters in the preheating ventilating duct for preheating outer cabinet 1), the old wind outlet air in interior
Pipeline 19 is connected with indoor old wind air outlet；So that being first passed through after outdoor fresh air is entered by outdoor fresh air intake stack 20
Heat exchange grid 23 is after obtaining waste heat in the old wind that indoor old wind wind pipe 19 is gone out, into the preheating for preheating outer cabinet 1
Ventilating duct 14 is preheated under the action of auxiliary condenser 5, the dehumidifying ventilating duct 15 for the outer cabinet 2 that dehumidifies then is entered back into, preceding
First segment dehumidifying is carried out under the action of the auxiliary evaporator 7 of section, is then carried out second segment under the action of the main evaporator 6 of back segment again and is removed
It is wet, the heating ventilating duct 16 of cabinet 3 in heating then is entered back into, is heated under the action of main condenser 4, is obtained dry warm
Then gas enters interior by vav terminal heating installation 13 again, heats to interior, the old wind eventually formed is by room
Interior old wind air outlet is discharged to outdoor through indoor old wind wind pipe 19；The vav terminal heating installation 13 passes through flexibility
Utilidor is connected with the air outlet for the heating ventilating duct 16 for heating interior cabinet 3, the vav terminal heating installation 13
Inner passage is provided with electric heating device 24, the rear of electric heating device 24 be provided with Pitot tubular type air velocity transducer 25 and
The rear of temperature sensor 26, Pitot tubular type air velocity transducer 25 and temperature sensor 26 is provided with volume damper 27, the wind
Adjustable valve 27 is connected with air-valve driver 28.
Specifically, the vav terminal heating installation 13 further includes temperature and blast volume controller 29, the temperature and air quantity
Controller 29 respectively with Pitot tubular type air velocity transducer 25, temperature sensor 26, electric heating device 24 and air-valve driver 28
It is connected.
Specifically, seamed type air diffuser 30 is arranged in the end of the inner passage of the air quantity variable end device 13.
Specifically, the volume damper is solenoid valve.
Specifically, the seam type air diffuser is set to indoor top, and the old wind air outlet is set to indoor bottom.
It using three cabinet double pump double-refrigerant loop configurations, preheats outer cabinet and is preheated, the outer cabinet that dehumidifies dehumidifies, and makes
Cabinet is heated in heat, herein it is emphasized that if using double case (i.e. outdoor unit, indoor unit) constructions, outdoor unit is straight
Connect and dehumidify to outdoor clammy air, effect on moisture extraction is very poor because outdoor clammy air be originally temperature it is extremely low and
And moisture content is high, therefore dew point is lower, and it is dry to be not easy pre- cold junction liquid；If it have to dry, outdoor unit just needs lower
Temperature, air by dehumidifying after temperature become lower, be unfavorable for the heating of indoor unit；And after using three box structures,
It preheats outer cabinet first to preheat outdoor clammy air, improves dew point, then dehumidified again by the outer cabinet that dehumidifies, just
Good removal moisture drying effect can be reached, and relatively high temperature can also be retained, heated, mentioned convenient for heating interior cabinet
High efficiency and heat utilization efficiency.For example, outdoor clammy 10 DEG C of air themperature, general 13 DEG C after air inlet/outlet waste-heat recovery device,
It is 15 DEG C general after the outer cabinet that dehumidifies (to be higher by 5 DEG C of left sides than outdoor clammy air themperature general 18 DEG C after preheating outer cabinet
It is right), general 28-30 DEG C of temperature after finally cabinet is heated in heat, therefore, the presence of three casing structures can
Effectively improve dehumidifying heating effect.Preheat that outer cabinet, the outer cabinet of dehumidifying, cabinet through type is connected to and constructs in heating, Quan Mianti
The operational efficiency of high Central Heating Providing system, thermal losses is low, and dry heating effect is good.Using air inlet/outlet waste-heat recovery device, fill
Divide using the waste heat in discharge exhaust gas, improves pre-heat effect.Using vav terminal heating installation, due to cabinet itself in heating
It is not easy to do and is precisely controlled to heating temperature, moreover, there are also defeated by certain pipeline after cabinet heating in heating for air
Send to be discharged indoors, and there is also the Dissipation changes of temperature in the process for this, and therefore, vav terminal heating installation can be effective
Ground carries out aids in temperature control by the cooperation of the auxiliary hot heater of electricity and volume damper, improves the accuracy of leaving air temp.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention,
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (5)
1. Central Heating Providing system in a kind of closed loop double-pump type preheating moist chamber, including the outer cabinet of preheating, the outer cabinet that dehumidifies, in heating
Cabinet, main condenser, auxiliary condenser, main evaporator, auxiliary evaporator, main compressor, auxiliary compressor, main check valve, auxiliary check valve,
Air inlet/outlet waste-heat recovery device and vav terminal heating installation, which is characterized in that the outer cabinet of the preheating, the outer cabinet peace of dehumidifying
Mounted in outdoor, and it is respectively arranged with preheating ventilating duct, dehumidifying ventilating duct, cabinet is installed indoors in the heating, and is provided with
Ventilating duct is heated, the preheating ventilating duct, dehumidifying ventilating duct and heating ventilating duct are sequentially connected logical, institute by flexible thermal insulation pipeline
The air outlet for stating preheating ventilating duct, dehumidifying ventilating duct and heating ventilating duct is provided with induced draft fans；The auxiliary condenser setting exists
The preheating ventilating duct middle section of outer cabinet is preheated, the leading portion of the dehumidifying ventilating duct of the outer cabinet of dehumidifying, institute is arranged in the auxiliary evaporator
State auxiliary compressor, auxiliary check valve is connected with auxiliary condenser, auxiliary evaporator respectively, formation auxiliary compressor to auxiliary condenser to auxiliary list
It flows to and recycles to the refrigerant of auxiliary evaporator to valve, the heating ventilating duct middle section for heating interior cabinet, institute is arranged in the main condenser
The back segment that the dehumidifying ventilating duct of the outer cabinet of dehumidifying is arranged in main evaporator is stated, the main compressor, main check valve are cold with master respectively
Condenser, main evaporator are connected, and form refrigerant of the main compressor to main condenser to main check valve to main evaporator and flow to circulation；
The air inlet/outlet waste-heat recovery device includes indoor old wind wind pipe, outdoor fresh air intake stack, air-out fan, air inlet fan
And old wind wind pipe, outdoor fresh air intake stack indoors is respectively set in heat exchange grid, the air-out fan, air inlet fan
Air outlet and air inlet, the heat exchange grid setting air opening end of old wind wind pipe and outdoor fresh air air inlet indoors
The air inlet end of pipeline, the outdoor fresh air intake stack are connected with the fresh air air inlet for preheating outer cabinet, and the interior is old
Wind wind pipe is connected with indoor old wind air outlet；So that first being passed through after outdoor fresh air is entered by outdoor fresh air intake stack
Overheat exchange grid is after obtaining waste heat in the old wind that indoor old wind wind pipe is gone out, into the preheating ventilation for preheating outer cabinet
Road, is preheated under the action of auxiliary condenser, the dehumidifying ventilating duct for the outer cabinet that dehumidifies then is entered back into, in the auxiliary evaporation of leading portion
Under the action of device carry out first segment dehumidifying, then again under the action of the main evaporator of back segment carry out second segment dehumidifying, then again into
The heating ventilating duct for entering cabinet in heating, is heated under the action of main condenser, is obtained dry heating, is then passed through change again
Air quantity end heating installation enters interior, heats to interior, and the old wind eventually formed is passed through by indoor old wind air outlet
Indoor old wind wind pipe is discharged to outdoor；The vav terminal heating installation is by flexible thermal insulation pipeline and heats interior cabinet
The air outlet of heating ventilating duct be connected, the inner passage of the vav terminal heating installation is provided with electricity auxiliary heating
Device, the rear of electric heating device are provided with Pitot tubular type air velocity transducer and temperature sensor, Pitot tubular type air velocity transducer
And the rear of temperature sensor is provided with volume damper, which is connected with air-valve driver.
2. Central Heating Providing system in closed loop double-pump type preheating moist chamber according to claim 1, which is characterized in that the change
Air quantity end heating installation further includes temperature and blast volume controller, and the temperature and blast volume controller are passed with Pitot tubular type wind speed respectively
Sensor, temperature sensor, electric heating device and air-valve driver are connected.
3. Central Heating Providing system in closed loop double-pump type preheating moist chamber according to claim 2, which is characterized in that the change
Seamed type air diffuser is arranged in the end of the inner passage of air quantity end equipment.
4. Central Heating Providing system in closed loop double-pump type preheating moist chamber according to claim 3, which is characterized in that the wind
Adjustable valve is solenoid valve.
5. Central Heating Providing system in closed loop double-pump type preheating moist chamber according to claim 4, which is characterized in that the seam
Type air diffuser is set to indoor top, and the old wind air outlet is set to indoor bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910258278.1A CN109899920B (en) | 2019-04-01 | 2019-04-01 | Closed-loop double-pump type preheating and dehumidifying indoor heating supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910258278.1A CN109899920B (en) | 2019-04-01 | 2019-04-01 | Closed-loop double-pump type preheating and dehumidifying indoor heating supply system |
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| Publication Number | Publication Date |
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| CN109899920A true CN109899920A (en) | 2019-06-18 |
| CN109899920B CN109899920B (en) | 2020-12-25 |
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| CN201910258278.1A Active CN109899920B (en) | 2019-04-01 | 2019-04-01 | Closed-loop double-pump type preheating and dehumidifying indoor heating supply system |
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| CN109899920B (en) | 2020-12-25 |
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