CN109631560A - A kind of heat pump drier that open and close type is changeable - Google Patents
A kind of heat pump drier that open and close type is changeable Download PDFInfo
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- CN109631560A CN109631560A CN201811503259.2A CN201811503259A CN109631560A CN 109631560 A CN109631560 A CN 109631560A CN 201811503259 A CN201811503259 A CN 201811503259A CN 109631560 A CN109631560 A CN 109631560A
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- air duct
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/001—Drying-air generating units, e.g. movable, independent of drying enclosure
- F26B21/002—Drying-air generating units, e.g. movable, independent of drying enclosure heating the drying air indirectly, i.e. using a heat exchanger
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
-
- 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
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The present invention relates to the heat pump driers that a kind of open and close type can be switched, include: air circulation: being divided into open circulation and closed cycle, including air door (3), blower (4), the first main air duct (14), the first air duct (11), hothouse (13), the second air duct (12) and the second main air duct (15) being arranged along air-flow direction, the switching of open type and closed cycle is carried out by air door (3)；Refrigerant circulation: including evaporator (2), compressor (7), condenser (6) and the throttling set (8) being arranged along refrigerant flow direction；Loop circuit heat pipe circulation: including the precool heat exchanger device that is arranged along refrigerant flow direction and again heat exchanger (5).Compared with prior art, the present invention further improves system performance by adding air door, setting control strategy.By hot pipe technique and heat pump heat recovery technology, step recycling is realized to waste heat, while by the reasonable Arrangement of blower position to reach further energy-efficient purpose.
Description
Technical field
The present invention relates to a kind of drying machine, the heat pump drier that can be switched more particularly, to a kind of open and close type.
Background technique
With the development of science and technology, the dry demand of article is increasing, traditional method for airing because drying time is long,
Climate factor influences the defects of big, is unable to satisfy the dry demand of contemporary society's article.Especially for needing the fast rapid-curing cutback of article
The problem of dry industry, dry goods difficulty is particularly evident.
Drying machine currently used in the market is mainly that electric heating or natural gas directly heat air, under fan action into
Enter hothouse, carries out hot and humid area with material to be dried, take away the moisture in material, realize drying process.But electrothermal is dry
Dry machine is primarily present energy consumption height, and safety is poor, the high disadvantage of maintenance cost.Heat pump drying equipment meet the tendency of in such a case and
It is raw, since its efficient, safe and environment-friendly advantage gradually starts to substitute the old-fashioned drying equipment in part.Heat pump drier is a kind of
Using the drying equipment of heat pump techniques, its essence is a kind of heat lift devices to be inhaled from ambient enviroment using inverse Carnot's principle
Heat is taken, and passes it on the object being heated.Open system and closed system are broadly divided into existing market.Two kinds of systems
In, there is heat pump cycle and air circulation two circulations, two cycle through evaporator and exchange with condenser progress heat.
For the heat pump drying equipment of open system, in heat pump cycle, by compressor work, a small amount of electricity is consumed
Can, refrigerant circulation is driven, so that refrigerant is absorbed the heat for passing through its surrounding air in evaporator, within the condenser with higher
Temperature is rejected heat to the air of entrance.In air circulation, under the promotion of blower, air is heated up by condenser, phase
Humidity is reduced, air absorbs the ability enhancing of moisture, and when blowing over article, article carries out hot and humid area, releases heat, band is leaked water
Point.In addition to this, for the tail gas after drying frequently with heat recovery apparatus, transmitting its heat is that air is preheated, and is further increased
Performance.It has many advantages, such as simple structure, and consuming energy, low, drying effect is good；
Closed system is close with open system principle, the difference is that in heat pump cycle, refrigerant suction in evaporator
Heat carrys out the waste heat of air and the latent heat of condensed water after self-desiccation.In air circulation, hothouse discharge damp-heat air directly into
Enter evaporator, the moisture in condensation air；The air of the low water capacity of low temperature is heated up by condenser again later, at this time air
It is stronger that the ability of absorption moisture compares open system
However, there are still following problems for existing heat pump drier technology: the drying machine of open system is in outside air temperature
Wet-out property is had a greatly reduced quality when lower or humidity is higher, and performance decline is obvious.And the drying machine of closed system is in order to guarantee to dehumidify
Effect is more preferable, and evaporating temperature is generally lower, and air first passes through evaporator cool-down dehumidification, is heated using condenser,
Front and back is cold and hot to offset, and brings unnecessary energy loss, and under high temperature low moisture environments, performance is not so good as open system.
Specifically include that Chinese patent CN207487271U proposes a kind of band heat pipe with the immediate technical solution of the present invention
Heat pump drying case, heat pipe condensation side is arranged to drying box exit, evaporation side is arranged to drying box inlet, to drying box
Exiting exhaust gas realize recuperation of heat, but the technical solution and unrecovered drying box exhaust in latent heat, cannot achieve open system with
The switching of closed system not can be carried out wet down processing to the air for entering drying box；Chinese patent CN103827385A is proposed
The heat pump drier of enclosed obtains heat from the condenser of temperature end, in evaporator recovery section heat after drying, while will be cold
Condensate discharge.But in this drying machine, the gas temperature come out from hothouse is still higher, is directly entered evaporator and cold
Heat transfer temperature difference is very big when condenser, and energy utilization efficiency reduces, and then leads to the reduction of whole system efficiency, lacks to more than different qualities
The mechanism of hot step recycling.Chinese patent CN207317478U proposes a kind of waste-heat recovery device of heat pump drier, passes through
It is laid with heat recovery apparatus and the waste heat that hothouse comes out air is led into vaporizer side, promote evaporating temperature to reduce energy consumption.But
The program equally fails to the exhaust heat stepped recycling of different qualities, while not can be carried out at wet down into the air before drying box
Reason, drying efficiency are still not high enough.Chinese patent CN107130415A proposes a kind of heat pump heat pipe combined type dryer, passes through
It is laid with loop circuit heat pipe before and after evaporator, realizes pre-cooling and preheating before and after evaporator, reduces unnecessary energy loss.But it should
Scheme is not able to achieve the switching of open and close type system, and the Position Design of blower obtains also not reasonable.
Summary of the invention
It is changeable that it is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of open and close types
Heat pump drier.
The purpose of the present invention can be achieved through the following technical solutions:
A kind of heat pump drier that open and close type is changeable, comprising:
Air circulation loop: including be arranged along air-flow direction rotary damper, main air duct, the first air duct, drying
Room, the second air duct return to main air duct, and the rotary shaft of the rotary damper is arranged on main air duct wall surface, main air duct is divided into
First main air duct and the second main air duct, air circulation carry out the switching of open circulation and closed cycle by rotary damper；
Refrigerant circulation loop: for closed cycle, including the evaporator, compressor, cold being arranged along refrigerant flow direction
Condenser and throttling set；
Loop circuit heat pipe circulation loop: for closed cycle, including the precool heat exchanger device that is arranged along refrigerant flow direction and again
Heat exchanger；
The heat exchanger again, condenser are successively set in the first main air duct along air-flow direction, precool heat exchanger device
It is successively set in the second main air duct with evaporator along air-flow direction.
Further, air inlet is formed between the air door and the first main air duct, is formed between air door and the second main air duct
Exhaust outlet.
Further, under open circulation, door opening, the first main air duct and the second main air duct are isolated, air inlet and air draft
Mouth is opened；Under closed cycle, air door is closed, and the first main air duct and the connection of the second main air duct, air inlet and exhaust outlet are closed.
Further, the loop circuit heat pipe circulation loop is driven by gravity drive or refrigerated medium pump.
Further, when loop circuit heat pipe circulation loop uses gravity drive, loop circuit heat pipe circulation includes multiple encloseds
Circulation, single closed cycle include by the heat exchanger tube of the sequentially connected precool heat exchanger device of connecting refrigerant lines and heat exchanger again
Heat exchanger tube, then heat exchanger heat exchanger tube be higher than precool heat exchanger device heat exchanger tube.
Further, when loop circuit heat pipe circulation loop is driven using refrigerated medium pump, precool heat exchanger device and reheating heat exchange
Refrigerated medium pump is also added between device.
Further, the condenser has coolant channel and air duct, and the coolant channel of condenser is being made
It is connected to by connecting refrigerant lines with compressor, throttling set in refrigerant circulation loop, the air duct of condenser is followed in air
It is connected to by air duct with heat exchanger again, hothouse in loop back path.
Further, the evaporator has coolant channel and air duct, and the coolant channel of evaporator is being made
It is connected to by connecting refrigerant lines with compressor, throttling set in refrigerant circulation loop, the air duct of evaporator is followed in air
In loop back path, it is connected to by air duct with precool heat exchanger device and exhaust outlet under open system mode, passes through wind under closed system mode
Road is connected to precool heat exchanger device and blower.
Further, the throttling set is capillary, short tube or electric expansion valve.
Further, the precool heat exchanger utensil prepares coolant channel and air duct, the refrigerant of precool heat exchanger device
Channel is connected to by connecting refrigerant lines with reheating heat exchanger in loop circuit heat pipe circuit, and the air duct of precool heat exchanger device is in sky
It is connected to by air duct with hothouse, evaporator in gas circulation loop.
Further, the heat exchanger again has coolant channel and air duct, then the refrigerant of heat exchanger
Channel is connected to precool heat exchanger device in loop circuit heat pipe circuit by connecting refrigerant lines, then heat exchanger air duct in sky
It is connected to by air duct with blower and condenser in gas circulation loop.
Further, blower is provided with before the heat exchanger again.
Further, when wind-warm syndrome is lower than outdoor air before blower, using open circulation mode；Wind-warm syndrome is higher than before blower
When outdoor air, using closed cycle mode.
Open circulation mode, door opening, system are used when air draught temperature is lower than the temperature of cabinet external environment before blower
Fresh air is sucked from air inlet, reheated heat exchanger and condenser processing are the air of high temperature, it is sent into hothouse and takes away moisture, then
Precool heat exchanger device is led to by air duct to recycle high-quality heat, secondary recuperation of heat is carried out by evaporator later, finally
It is discharged by exhaust outlet.
Closed system mode is used when air draught temperature is higher than environment temperature before blower, air door is closed, and system is followed for enclosed
Ring, evaporator air outlet become the higher dry air of temperature by heat exchanger again and condenser, are sent into hothouse and take away
Moisture, then evaporator side is sent back to by air duct again and carries out wet down processing and recuperation of heat, complete one cycle flow path.Repeatedly follow
After ring, become the air of high temperature drying, will be discharged in atmosphere after the completion of the article drying of hothouse.
The present invention is provided with the air door of switching open system and closed system, is higher than environment by setting fan induced draught temperature
Temperature uses closed system mode, and air draught temperature uses the control strategy lifting system of open system mode lower than environment temperature
Energy.In addition to this, the pre-cooling before device is evaporated by loop circuit heat pipe and the reheating before condenser, by evaporator to air draft
Further recuperation of heat is carried out, realizes the step recycling of dry final vacuum waste heat.Blower is set at minimum wind-warm syndrome, thus into
The system performance of one step promotion heat pump drier.
The invention is characterized in that 1. add air door on the basis of conventional heat pump drying machine, realizes open system and close
The handoff functionality of formula system.Control strategy is, when wind-warm syndrome is lower than outdoor air before blower, using open system mode, wind-warm syndrome
When higher than outdoor air, using closed system mode；2. the pre- cold dish of loop circuit heat pipe is set up on front side of evaporator and condenser respectively
Pipe and again hot coil, reduce unnecessary energy loss, while reducing the load and power consumption of heat pump cycle；3. evaporator is placed in wind
Side in front of the door can carry out secondary recuperation of heat to system off heat；4. being that total system wind-warm syndrome is minimum before blower is set to heat exchanger again
Locate, therefore density highest, quality is maximum under identical air quantity, can further decrease system energy consumption.
Compared with prior art, the invention has the following advantages:
1. the formulation of air door set up with control strategy is so that system integrates open circulation and closed cycle and can
Flexible transformation reduces system energy consumption；
2. set up and the heat pump heat recovery technology of heat pipe recycle system waste heat step, system energy consumption is reduced；
3. blower is set to wind-warm syndrome lowest part in system, quality is maximum under identical air quantity, lifting system performance.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the changeable heat pump drier of open and close type of the present invention；
Fig. 2 is the workflow signal under a kind of open system mode of the changeable heat pump drier of open and close type of the present invention
Figure；
Fig. 3 is the workflow signal under a kind of closed system mode of the changeable heat pump drier of open and close type of the present invention
Figure；
Fig. 4 is that the present invention improves the structural schematic diagram after designing at air door.
Shown in figure label:
1, precool heat exchanger device, 2, evaporator, 3, air door, 4, blower, 5, heat exchanger again, 6, condenser, 7, compressor, 8,
Throttling set, 9, exhaust outlet, 10, air inlet, the 11, first air duct, the 12, second air duct, 13, hothouse, the 14, first main air duct,
15, the second main air duct.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
A kind of heat pump drier that open and close type is changeable, as shown in Figure 1, comprising:
Refrigerant circulation loop: including being connected by circulation condenser 6, compressor 7, the refrigerant of throttling set 8 and evaporator 2
Channel；
Loop circuit heat pipe circulation loop: including multiple closed cycles, each closed cycle includes head and the tail connection and parallel
The coolant channel of piece precool heat exchanger device 1 and the coolant channel of a reheating heat exchanger 5, the refrigerant of reheating heat exchanger 5
The height in channel is higher than the coolant channel of precool heat exchanger device 1, and the coolant channel of all reheating heat exchangers 5 is located at same vertical
On face, the coolant channel of all precool heat exchanger devices 1 is located on same vertical plane；
Air circulation loop: including air inlet 10, the blower 4 being connected by circulation, the air duct of reheating heat exchanger 5, condensation
Row after the air duct of device 6, hothouse 13, the air duct of precool heat exchanger device 1, the air duct of evaporator 2, door opening
Air port 9 and the second air duct 12 and the first air duct 11.
Its main working process are as follows: in refrigerant circulation, refrigerant becomes the gas of high temperature and pressure under the effect of compressor 7
Body enters condenser 7 by connecting refrigerant lines, and condensation becomes the liquid of high temperature and pressure, and releases a large amount of heat and be used for
Air in warmed up air passage.Liquid refrigerant enters throttling set 8 through connecting refrigerant lines again, and throttling becomes low-temp low-pressure
Refrigerant liquid.Later, refrigerant enters evaporator 2 through connecting refrigerant lines, and heat absorption flashes to the refrigerant gas of low-temp low-pressure
Body makes the cooling-dehumidifying air in air duct.After refrigerant exits evaporator 2, compressor 7 is returned to through connecting refrigerant lines,
Complete refrigerant circulation；
In loop circuit heat pipe, refrigerant absorbs heat evaporation as refrigerant gas, in air duct in precool heat exchanger device 1
Air play the effect of pre-cooling.Gaseous refrigerant enters reheating heat exchanger 5 through connecting refrigerant lines, and condensation becomes refrigerant liquid
Body releases heat, and the effect of reheating is played to the air in air duct.Later, liquid refrigerant passes through gravity, capillary force
Effect or refrigerated medium pump return to precool heat exchanger device 3 through connecting refrigerant lines, complete loop circuit heat pipe circulation；
In air circulation, it is open system that air door 3, which is opened, and cyclic process is as shown in Fig. 2, system is passed through by air inlet 10
Blower 4 sucks surrounding air, logical by the air duct of the reheating heat exchanger 5 in the first main air duct 14 and the air of condenser 6
Road is heated as high temperature dry air, enters hothouse 13 through the first air duct 11, blows over article.The air of high temperature drying passes through
Hot and humid area improves article temperature, and takes away the moisture in article, and air themperature declines relative humidity and rises, and becomes low temperature height
Humid air.The air being discharged from hothouse 13 enters the air of the precool heat exchanger device 1 in the second main air duct 15 through the second air duct 12
Channel, to the refrigerant in precool heat exchanger device 1, air realizes pre-cooling for heat release.Air after pre-cooling enters evaporator 2 through air duct
Air duct, air becomes low temperature and low humidity air by further cool-down dehumidification.Later, air is through being discharged to environment at exhaust outlet 9
In, complete air flue.
Air door 3, which is closed, is switched to closed system, cyclic process as shown in figure 3, evaporator 2 cool down coagulate it is wet after low humidity it is empty
Gas is under the effect of blower 4, by the air duct of the reheating heat exchanger 5 in the first main air duct 14 and the air duct of condenser 6,
It is heated as high temperature dry air, enters hothouse 13 through the first air duct 11, blows over article.The air of high temperature drying is wet by heat
Exchange improves article temperature, and takes away the moisture in article, and air themperature declines relative humidity and rises, and becomes low temperature and high relative humidity sky
Gas.The air being discharged from hothouse 13 enters the air duct of the precool heat exchanger device 1 in the second main air duct 15 through the second air duct 12,
To the refrigerant in precool heat exchanger device 1, air realizes pre-cooling for heat release.Air after pre-cooling enters the sky of evaporator 2 through air duct
Gas channel, air become low temperature and low humidity air by further cool-down dehumidification.Finally, low temperature and low humidity air returns to blower 4, complete
Air circulation.
Embodiment 2
A kind of heat pump drier that open and close type is changeable, can be further improved the design at air port, connect such as Fig. 4 institute
Show.Compared with Example 1, essential difference is that the air duct at air door 3 is set as 180 ° of revolution air ducts.Its advantage are as follows: shorten
Desuperheating coil and again the distance between hot coil, the refrigerant between reheating of being more convenient for heat exchanger 5 and precool heat exchanger device 1 follow
Ring.
The above description of the embodiments is intended to facilitate ordinary skill in the art to understand and use the invention.
Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein general
Principle is applied in other embodiments without having to go through creative labor.Therefore, the present invention is not limited to the above embodiments, ability
Field technique personnel announcement according to the present invention, improvement and modification made without departing from the scope of the present invention all should be of the invention
Within protection scope.
Claims (9)
1. a kind of changeable heat pump drier of open and close type characterized by comprising
Air circulation loop: including be arranged along air-flow direction rotary damper (3), main air duct, the first air duct (11), dry
Dry room (13), the second air duct (12) return to main air duct, and the rotary shaft of the rotary damper (3) is arranged on main air duct wall surface,
Main air duct is divided into the first main air duct (14) and the second main air duct (15), air circulation carries out open type by rotary damper (3)
The switching of circulation and closed cycle；
Refrigerant circulation loop: including be arranged along refrigerant flow direction evaporator (2), compressor (7), condenser (6) and
Throttling set (8)；
Loop circuit heat pipe circulation loop: including the precool heat exchanger device that is arranged along refrigerant flow direction and again heat exchanger (5)；
The heat exchanger again (5), condenser (6) are successively set in the first main air duct (14) along air-flow direction, pre-cooling
Heat exchanger and evaporator (2) are successively set in the second main air duct (15) along air-flow direction.
2. a kind of changeable heat pump drier of open and close type according to claim 1, which is characterized in that the air door (3)
Air inlet (10) are formed between the first main air duct (14), form exhaust outlet (9) between air door (3) and the second main air duct (15).
3. a kind of changeable heat pump drier of open and close type according to claim 2, which is characterized in that under open circulation,
Air door (3) is opened, and the first main air duct (14) and the second main air duct (15) isolation, air inlet (10) and exhaust outlet (9) are opened；Enclosed
Under circulation, air door (3) is closed, and the first main air duct (14) is connected to the second main air duct (15), and air inlet (10) and exhaust outlet (9) close
It closes.
4. a kind of changeable heat pump drier of open and close type according to claim 1, which is characterized in that the loop circuit heat pipe
Circulation loop is driven by gravity drive or refrigerated medium pump.
5. a kind of changeable heat pump drier of open and close type according to claim 4, which is characterized in that when loop circuit heat pipe follows
Loop back path use gravity drive when, then heat exchanger (5) heat exchanger tube be higher than precool heat exchanger device (1) heat exchanger tube.
6. a kind of changeable heat pump drier of open and close type according to claim 4, which is characterized in that when loop circuit heat pipe follows
When loop back path is driven using refrigerated medium pump, precool heat exchanger device and again heat exchanger also add refrigerated medium pump between (5).
7. a kind of changeable heat pump drier of open and close type according to claim 1, which is characterized in that the throttling set
It (8) is capillary, short tube or electric expansion valve.
8. a kind of changeable heat pump drier of open and close type according to claim 1, which is characterized in that the reheating heat exchange
Blower (4) are provided with before device (5).
9. a kind of changeable heat pump drier of open and close type according to claim 8, which is characterized in that before blower (4)
When wind-warm syndrome is lower than outdoor air, using open circulation mode；When wind-warm syndrome is higher than outdoor air before blower (4), followed using enclosed
Ring mode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811503259.2A CN109631560A (en) | 2018-12-10 | 2018-12-10 | A kind of heat pump drier that open and close type is changeable |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811503259.2A CN109631560A (en) | 2018-12-10 | 2018-12-10 | A kind of heat pump drier that open and close type is changeable |
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Cited By (7)
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| CN110260610A (en) * | 2019-07-17 | 2019-09-20 | 中冶赛迪工程技术股份有限公司 | A kind of novel drying oven device |
| CN111023790A (en) * | 2019-12-25 | 2020-04-17 | 天津商业大学 | Chinese herbal medicine heat pump drying system with heat pipe heat regenerator |
| CN112050618A (en) * | 2020-08-05 | 2020-12-08 | 同济大学 | Triple-effect heat recovery type air mixing type heat pump drying system and application thereof |
| WO2021000873A1 (en) * | 2019-07-01 | 2021-01-07 | 北京航空航天大学 | Overall efficient heat dissipation system for high power density cabinet |
| CN112944477A (en) * | 2021-02-26 | 2021-06-11 | 青岛海尔空调电子有限公司 | Fresh air system and air conditioner comprising same |
| CN113639480A (en) * | 2021-09-07 | 2021-11-12 | 青岛大学 | High-temperature heat pump air sterilizing machine |
| CN114026377A (en) * | 2020-04-27 | 2022-02-08 | 空气技术工程有限公司 | Heat pump type cold and hot air dryer and drying method |
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