CN104482749B - A kind of drying system for reducing air source heat pump defrost temperature - Google Patents
A kind of drying system for reducing air source heat pump defrost temperature Download PDFInfo
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- CN104482749B CN104482749B CN201410725545.9A CN201410725545A CN104482749B CN 104482749 B CN104482749 B CN 104482749B CN 201410725545 A CN201410725545 A CN 201410725545A CN 104482749 B CN104482749 B CN 104482749B
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Abstract
The invention discloses a kind of drying system for reducing air source heat pump defrost temperature, including air source heat pump and drying room, drying room damp and hot return air is sent into by vaporizer air intake by air channel, heating evaporation device improves evaporator temperature, allow defrost temperature to reduce by 8～10 DEG C, largely avoid defrost process and start the negative consequence brought.
Description
Technical field
The present invention relates to a kind of air source heat pump technology.
Technical background
Air-source heat-pump air heater is mainly by condenser, condenser fan, compressor, four-way change-over valve, throttling arrangement, steaming
Send out device, evaporator fan composition, compressor, condenser, throttling arrangement, vaporizer, sequentially with working medium pipeline connect, formation one
Closed circuit.
The drying of the materials such as agricultural product is carried out using air-source heat-pump air heater as firing equipment, with higher than or apparently higher than
The heat energy of temperature of charge is heated to material, and the air of heating is contacted with surface of material, and hot-air cooling, material absorb heat
Temperature is raised, and after material heating, by table is to inner its moisture content heat absorption evaporation or vaporizes, hydrone becomes damp and hot together with heating medium
Air, is discharged outside drying room by wet-emitting blower.
Winter-spring season temperature exists, 6 DEG C of ambient temperature and it is following when, the temperature of air-source heat-pump air heater vaporizer can drop
To -2 DEG C or less, the air of moisture is carried by vaporizer, frosting to the cold is adhered on an evaporator, with the work of firing equipment
Make the growth of time, the frost for adhering on an evaporator is thickened, and now, has influence on the heating effect of equipment.In order to remove vaporizer
On frost, prior art defrost will meet two conditions；1), the temperature sensor of vaporizer collects warm equal to or less than -2 DEG C
Degree signal；2), 40 five-minute period of time delay, within the time period of time delay, not higher than -1 DEG C of temperature signal change.When above-mentioned two
Start defrost program when individual condition meets simultaneously, four-way change-over valve commutation work flowed through the high temperature refrigerant flow direction of condenser originally
Vaporizer, vaporizer defrost under the heating of high temperature refrigerant；Originally the cryogenic fluid for flowing through vaporizer flows to condenser, defrost
Journey needs nine minutes or so containing conversion time.Therefore, air-source heat-pump air heater works in 4 DEG C of ambient temperature and temperature below
When, actual Energy Efficiency Ratio will reduce by 20～25%, such as：When ambient temperature is between 0～4 DEG C, just have one per 55 minutes equipment
Secondary defrost process, during defrost, the heating of equipment is not used for drying, equal to the time device for having 18% per hour work not used for
Heating, 18% being reduced equal to equipment heating capacity, this can substantially reduce equipment capacity for heating, drying material.
Meanwhile, when equipment returns to heating cycle by defrost change working, the heating capacity of initial a few minutes is reduced, it is impossible to which material is carried out
Heating.
The content of the invention
In order to overcome the deficiencies in the prior art, the technical problem to be solved is to expand air source heat pump drying room to dry
Dry ability and energy-saving potential, provide and a kind of still possess stronger dry materials ability and higher efficiency when low temperature environment works
The air source heat pump drying room of ratio, in order to solve the technical problem, the technical solution used in the present invention is, a kind of to reduce air source
The drying system of heat pump defrost temperature, including air source heat pump and drying room, it is characterised in that in the casing of the air source heat pump
It is divided into evaporator room and condenser chamber；Evaporator room is divided into air-inlet cavity and air-out chamber by vaporizer, and the air-out chamber goes out
Air port arranges evaporator fan, and air-inlet cavity is provided with fresh air inlet；
Condenser chamber is divided into return air chamber and wind pushing cavity by condenser, and return air chamber connects the return air inlet of the drying room, return air
Chamber supplements fresh air by B air channels, and wind pushing cavity connects the air inlet of the drying room by condenser fan；
Connected by A air channels between the air-inlet cavity and return air chamber, the import in A air channels is located at return air chamber, the outlet of A channel
Positioned at air-inlet cavity.
Using above-mentioned technical proposal, following beneficial effect can be produced：Drying room damp and hot return air is sent into by A air channels and evaporate
Device air intake, heating evaporation device improve evaporator temperature so that defrost temperature (causes equipment to start the ambient temperature of defrost program
Abbreviation defrost temperature) 8～10 DEG C can be reduced, largely avoid defrost process and start the negative consequence brought.
With improvement, heat exchange is carried out by air-to-air total heat exchanger between the A air channels and B air channels.By air-to-air total heat exchanger
Heat exchange, takes full advantage of the used heat of the damp and hot return air of drying room, improves equipment heating capacity.
With improvement, the B air channels are provided with air door so that equipment easily can be closed as needed or be opened B air channels, ring
When border temperature is more than 5 DEG C, the technical scheme can effectively improve the Energy Efficiency Ratio of system.
Preferred version one, the outlet in the A air channels and the distance of vaporizer are referred to as the first distance, the air-inlet cavity it is new
Wind entrance is referred to as second distance with the distance of vaporizer, and first distance is less than second distance.So that the hot blast phase in A air channels
For fresh air preferentially enters vaporizer and evaporator fan, supplement of the fresh air only as hot blast.
Preferred version two, carries out heat exchange by air-to-air total heat exchanger between the A air channels and B air channels；The B air channels are provided with
Air door；Blower fan is set between the outlet of A channel and vaporizer, when the temperature sensor of vaporizer is collected equal to or less than -2
DEG C temperature signal, when reaching 15～40 minutes, air door is closed, and blower fan is opened and forces dehumidifying.The optimal technical scheme two it is beneficial
Details are as follows for effect：
1) in 3 DEG C to -4 DEG C of ambient temperature, MOD is closed, and air-to-air total heat exchanger function changes, changes from full heat
Hot device function becomes the A channel airduct without heat exchange function, it is ensured that useless damp-heat air has higher temperature.2) it is useless in drying room
Damp-heat air carries out defrost process to vaporizer, it is to avoid heating enters defrost program, improves the efficiency of heating
Than.3) waste gas residual heat after defrost improves the heating capacity of system again by Systemic absorption.Shown by many experiments result,
Air door is closed in 3 DEG C to -4 DEG C of ambient temperature, heating will not enter defrost program.It is not related in 4 DEG C of environment above temperature
Air door is closed, air-to-air total heat exchanger maintains heat exchange function, and heating will not also enter defrost program.Because the A air channels and B
The exchange capability of heat of heat exchange is carried out between air channel by air-to-air total heat exchanger between 35% to 45%.After air-to-air total heat exchanger
Waste heat, continues heating evaporation device, makes the temperature of evaporator coil be more than -2 DEG C.By air-to-air total heat exchanger exchanged heat 35% to
45% heat energy, heated due to dehumidifying and enters the fresh air of drying room, takes full advantage of the used heat of the damp and hot return air of drying room, improves and set
Standby heating capacity.
The purpose of the present invention is except solving the ambient temperature that heating enters defrost program is substantially reduced during drying work
Outward, its heating capacity to be also improved, comparative testing below has been made with regard to the raising inventor of heating capacity now；All in ambient temperature 0
DEG C when, all using paddy take turns KCZR72 compressors, fan delivery is all 4900m3/ h, P group is using preferred version two of the present invention, S
Group is prior art air-source heat-pump air heater, under identical drying room, identical operating mode (ambient temperature, circulated air, empty drying room), point
The condenser fan air-out pathogenic wind-warm for not measuring two groups of technical schemes is contrasted：
P groups：30 DEG C of drying room temperature, 38 DEG C of the air-out pathogenic wind-warm of condenser fan；40 DEG C of drying room temperature, condenser fan go out
49 DEG C of wind pathogenic wind-warm；Drying room temperature 50 C, 59.5 DEG C of the air-out pathogenic wind-warm of condenser fan.Heating takes one hour 23 points, system
Hot systems are introduced into defrost；
S groups：30 DEG C of drying room temperature, 37 DEG C of the air-out pathogenic wind-warm of condenser fan；40 DEG C of drying room temperature, condenser fan go out
47 DEG C of wind pathogenic wind-warm；Drying room temperature 50 C, 56 DEG C of the air-out pathogenic wind-warm of condenser fan.02 points of time-consuming two hours of heating, heats and is
System enters defrost twice；
Prior art heating be can be seen that from above-mentioned experiment and enter defrost program twice；Technical scheme
In 0 DEG C of ambient temperature, heating does not enter defrost program.And the air-out pathogenic wind-warm of P group condenser fans is higher than S groups.
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Description of the drawings
Accompanying drawing is present system principle of compositionality schematic diagram.
Specific embodiment
Referring to accompanying drawing, reflect a kind of concrete structure of the present invention, the drying system of the reduction air source heat pump defrost temperature
System, including air source heat pump and drying room 1, is divided into evaporator room and condenser chamber in the casing of the air source heat pump；Evaporation
Device room is divided into air-inlet cavity 9 and air-out chamber 6 by vaporizer 7, and the air outlet of the air-out chamber arranges evaporator fan 5, air-inlet cavity
It is provided with fresh air inlet 8；
Condenser chamber is divided into return air chamber 4 and wind pushing cavity 11 by condenser 12, and return air chamber 4 connects the return air of the drying room 1
Mouth 2, return air chamber 4 supplement fresh air by B air channels, and wind pushing cavity 11 connects the air inlet of the drying room 1 by condenser fan 13；
Connected by A air channels between the air-inlet cavity 9 and return air chamber 4, the import in A air channels is located at return air chamber 4, A channel
Outlet is positioned at air-inlet cavity 9.The entrance in B air channels is provided with self closing door 10.By full heat heat exchange between the A air channels and B air channels
Device 3 carries out heat exchange.In this example, two air channels for mutually exchanging heat of the A air channels and B air channels as air-to-air total heat exchanger 3.It is described
The air outlet in A air channels is relative to fresh air inlet 8 closer to evaporator fan 5 so that the hot blast in A air channels preferentially enters relative to fresh air
Enter vaporizer 7 and evaporator fan 5, supplement of the fresh air only as hot blast.
Blower fan 14 is set between the outlet of A channel and vaporizer 7, is equal to when the temperature sensor of vaporizer 7 is collected
Or -2 DEG C of temperature signals are less than, when reaching 15～40 minutes, self closing door 10 is closed, and blower fan 14 is opened and forces dehumidifying.
In order to absolutely prove beneficial effects of the present invention, in equivalent environment temperature, identical heat pump power, identical drying room, phase
With under weight material and identical operating mode, control experiment is carried out and has been compared, specific embodiment has been respectively described below：
Two drying rooms of first, second are heated using air-source heat-pump air heater, and the heating of mode of heating circulated air, compressor adopt paddy
Wheel KCZR72 compressors, weather are cloudy day, 3～7 DEG C of ambient temperature, and the material that each drying room is dried is firework paper web, material
1250 kilograms of weight, water content 27%, the water content after drying are not more than 1%.
First drying room is heated using traditional air-source heat-pump air heater, is provided without technical solution of the present invention, after charging, is only added
Hot not dehumidifying four hours, drying room temperature reach 32 DEG C；
Again Jing after 6 hours heating dehumidifying, drying room temperature reaches 34 DEG C, and in 6 hours, dehumidifying set of time is, W:Y=2
Minute：5 minutes (in heating, the time of dehumidifying is named as W, and the time for only heating not dehumidifying is named as Y, following all same)；
W:Y=2 minutes：6 minutes, but Jing after 5 hours heating dehumidifying, drying room temperature reaches 38 DEG C；
W:Y=2 minutes：7 minutes, but Jing after 5 hours heating dehumidifying, drying room temperature reaches 43 DEG C；
W:Y=2 minutes：8 minutes, and Jing:After 4 hours heating dehumidifying, drying room temperature reaches 49 DEG C；
W:Y=1 minutes：6 minutes, but Jing after 5 hours heating dehumidifying, drying room temperature reaches 57 DEG C.Drying materials share 29
Hour, 186 degree of power consumption.In drying course, when ambient temperature reaches 6 DEG C, air-source heat-pump air heater is put into defrost, if
Standby heating efficiency is substantially reduced.
Second drying room adopts technical solution of the present invention, and after charging, dehumidifying is not only heated 3 hours, and drying room temperature reaches 32 DEG C, enters
Enter to heat dehumidifying；
Again Jing after 5 hours heating dehumidifying, drying room temperature reaches 35 DEG C, W:Y=2 minutes：4 minutes；
W:Y=2 minutes：5 minutes, but Jing after 3.5 hours heating dehumidifying, drying room temperature reaches 39 DEG C；
W:Y=2 minutes：5 minutes, but Jing after 3 hours heating dehumidifying, drying room temperature reaches 44 DEG C；
W:Y=1 minutes：5 minutes, but Jing after 3 hours heating dehumidifying, drying room temperature reaches 50 DEG C；
W:Y=1 minutes：6 minutes.Again Jing after 2.5 hours heating dehumidifying, drying room temperature reaches 58 DEG C.
Drying materials are shared 20 hours, 130 degree of electricity of power consumption.Air-source heat-pump air heater in the overall drying process, does not enter
Enter defrost, improve the heating efficiency of system, Waste Heat Recovery also generates active influence to drying in addition, shorten 9 hours and dry
Dry time, 56 degree of saving are electric.
The above-mentioned implementation of present invention description is merely to clearly illustrate technical scheme, and be not understood that
It is that any restriction is made to the present invention.The present invention there is known various replacements or deformation in the art, without departing from
On the premise of essential meaning of the present invention, protection scope of the present invention is each fallen within.
Claims (2)
1. a kind of drying system for reducing air source heat pump defrost temperature, including air source heat pump and drying room, it is characterised in that institute
State；Evaporator room is divided into air-inlet cavity by evaporator coil
And air-out chamber, the air outlet setting evaporator fan of the air-out chamber, air-inlet cavity are provided with fresh air inlet；
Condenser chamber is divided into return air chamber and wind pushing cavity by condenser coil, and return air chamber connects the return air inlet of the drying room, return air
Chamber supplements fresh air by B air channels, and wind pushing cavity connects the air inlet of the drying room by condenser fan；
Connected by A air channels between the air-inlet cavity and return air chamber, the import in A air channels is located at return air chamber, and the outlet of A channel is located at
Air-inlet cavity；
The outlet in the A air channels is referred to as the first distance, fresh air inlet and the steaming of the air-inlet cavity with the distance of evaporator fan
The distance for sending out device blower fan is referred to as second distance, and first distance is less than second distance；
The B air channels are provided with air door；Heat exchange is carried out by air-to-air total heat exchanger between the A air channels and B air channels；In A channel
Between outlet and vaporizer, blower fan is set.
2. a kind of drying system for reducing air source heat pump defrost temperature as claimed in claim 1, it is characterised in that work as evaporation
The temperature sensor of device is collected and is equal to or less than -2 DEG C of temperature signals, and when reaching 15～40 minutes, air door is closed, and blower fan is opened
Force dehumidifying.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410725545.9A CN104482749B (en) | 2014-12-03 | 2014-12-03 | A kind of drying system for reducing air source heat pump defrost temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410725545.9A CN104482749B (en) | 2014-12-03 | 2014-12-03 | A kind of drying system for reducing air source heat pump defrost temperature |
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| CN104482749A CN104482749A (en) | 2015-04-01 |
| CN104482749B true CN104482749B (en) | 2017-03-29 |
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| CN201410725545.9A Active CN104482749B (en) | 2014-12-03 | 2014-12-03 | A kind of drying system for reducing air source heat pump defrost temperature |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110044143A (en) * | 2019-04-10 | 2019-07-23 | 中山市爱美泰电器有限公司 | A kind of opening and closing bimodulus mating type drying system based on heat pump techniques |
| CN113720114A (en) * | 2021-08-24 | 2021-11-30 | 玉溪新天力农业装备制造有限公司 | Air source heat pump parallel air supply type dryer |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4365480A (en) * | 1978-09-05 | 1982-12-28 | United Air Specialists, Inc. | Process gas treating apparatus |
| KR100343807B1 (en) * | 1999-12-23 | 2002-07-20 | 진금수 | Dry apparatus |
| JP2003269820A (en) * | 2002-03-18 | 2003-09-25 | Yunimakku:Kk | Drying method and cold air dryer |
| JP5095240B2 (en) * | 2007-03-07 | 2012-12-12 | ハイアール グループ コーポレーション | Dryer |
| CN202792879U (en) * | 2012-06-28 | 2013-03-13 | 胡松林 | Total heat recovery type air source dehumidifying and drying integrated machine |
| CN103123215A (en) * | 2013-03-11 | 2013-05-29 | 孙应真 | Intelligent hot-air drying control device |
| CN203615716U (en) * | 2013-10-23 | 2014-05-28 | 洛阳蓝海节能科技有限公司 | Waste heat defrosting type heat pump dryer |
| CN203672095U (en) * | 2013-12-31 | 2014-06-25 | 嵊州市海鹭制冷干燥设备有限公司 | High-efficiency drier |
| CN204346066U (en) * | 2014-12-03 | 2015-05-20 | 湖南省浏阳市择明热工器材有限公司 | A kind of drying system reducing air source heat pump defrost temperature |
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Address after: Hunan province Changsha Jianmin road 410300, Liuyang economic and Technological Development Zone, west of State Road 319 South Applicant after: Hunan Liuyang Zeming Thermodynamic Equipment Co., Ltd. Address before: 410300 room 1, unit 1, 501 industrial products market, Changsha, Hunan, Liuyang Applicant before: Hunan Liuyang Zeming Thermodynamic Equipment Co., Ltd. |
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