CN103742987B - The Defrost method of new blower fan system - Google Patents
The Defrost method of new blower fan system Download PDFInfo
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- CN103742987B CN103742987B CN201410028286.4A CN201410028286A CN103742987B CN 103742987 B CN103742987 B CN 103742987B CN 201410028286 A CN201410028286 A CN 201410028286A CN 103742987 B CN103742987 B CN 103742987B
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Abstract
The present invention relates to the Defrost method of a kind of new blower fan system, be applied in new blower fan system, this Defrost method is: under the heating mode of new blower fan system, the outlet temperature of detection air exhaust heat exchange device; When the outlet temperature of detected air exhaust heat exchange device is lower than the first design temperature, make new blower fan system enter defrosting mode to run, including making fresh-air fan with low cruise or out of service, make exhaust fan run at high speed simultaneously, and make compressor out of service; When the time that defrosting mode runs reaches the outlet temperature of set defrosting time or detected air exhaust heat exchange device higher than the second design temperature, new blower fan system recovers heating mode. This Defrost method can run under heating mode in the winter time, solves the frosting problem of air exhaust heat exchange device and main heat exchanger, it is to avoid has the noise that the switching of cross valve brings, and is prevented from the problem that the too low indoor temperature caused of new air temperature reduces.
Description
Technical field
The present invention relates to a kind of method frosting on main heat exchanger and air exhaust heat exchange device being purged when being applied to heat in the winter time in new blower fan system.
Background technology
Existing new blower fan system is as shown in Figure 1, it includes compressor, air exhaust heat exchange device, fresh air heat exchanger, plate type heat exchanger (main heat exchanger), fresh-air fan, exhaust fan, the relative fresh air heat exchanger of fresh-air fan is arranged, the relative air exhaust heat exchange device of exhaust fan is arranged, compressor, air exhaust heat exchange device and fresh air heat exchanger are connected as loop by pipeline, and this loop is additionally provided with cross valve and throttling arrangement.
During summer, new blower fan system runs in a chiller mode, first 26 DEG C the introduced outdoor ~ new wind of 43 DEG C carry out heat exchange with 24 DEG C ~ 26 DEG C return air of indoor in plate type heat exchanger, the temperature of new wind is down to less than 35 DEG C, then new wind carries out heat exchange via fresh air heat exchanger, now fresh air heat exchanger is equivalent to vaporizer, final newly eolian for indoor fresh air that temperature constant is 20 DEG C ~ 26 DEG C, and return air is through plate type heat exchanger, and temperature rises to after more than 30 DEG C, heat exchange is carried out via air exhaust heat exchange device, now air exhaust heat exchange device is equivalent to condenser, return air heat the most at last is discharged by outdoor exhaust outlet.
During winter, new blower fan system runs with heating mode, the new wind of-5 DEG C the introduced outdoor ~ 20 DEG C return air with indoor 20 DEG C ~ 24 DEG C carries out heat exchange in plate type heat exchanger, the temperature of new wind rises to more than 10 degrees Celsius, then heat exchange is carried out via fresh air heat exchanger, now fresh air heat exchanger is equivalent to condenser, final newly eolian for indoor fresh air that temperature constant is 20 DEG C ~ 24 DEG C, then through plate type heat exchanger, temperature drops to after below 15 DEG C return air, heat exchange is carried out via air exhaust heat exchange device, now air exhaust heat exchange device is equivalent to vaporizer, return air cold the most at last is discharged by outdoor exhaust outlet.
Switching cross valve is needed when above-mentioned refrigeration mode and heating mode conversion.
During winter, because temperature is too low, it is possible to plate type heat exchanger and air exhaust heat exchange device (being now equivalent to vaporizer) frosting can be caused. Now, it is possible to the method for the existing defrosting of employing is, by the switching of cross valve, force new blower fan system running refrigerating pattern, thus carrying out defrosting action. But, there is following problem in existing this Defrost method:
1, during forced refrigeration, can cause that the temperature of indoor fresh air is very low, thus reducing the temperature of indoor;
2, during forced refrigeration, cross valve switches over and can cause bigger noise, can cause user discontented of new blower fan system;
3, the method cannot solve the frosting problem of plate type heat exchanger.
Summary of the invention
It is an object of the invention to provide and a kind of can overcome the deficiency of existing Defrost method, can will not reduce indoor temperature while main heat exchanger and air exhaust heat exchange device are defrosted and the Defrost method of noise will not be produced.
For reaching above-mentioned purpose, the technical solution used in the present invention is:
A kind of Defrost method of new blower fan system, it is applied in new blower fan system, described new blower fan system includes compressor, air exhaust heat exchange device, fresh air heat exchanger, main heat exchanger, fresh-air fan, exhaust fan, the fresh air heat exchanger setting that described fresh-air fan is relatively described, the air exhaust heat exchange device setting that described exhaust fan is relatively described, described compressor, described air exhaust heat exchange device and described fresh air heat exchanger are connected as loop by pipeline; New wind subsystem that new wind is constituted through described main heat exchanger, described fresh-air fan and described fresh air heat exchanger and by outdoor inlet chamber, return air subsystem that return air is constituted through described main heat exchanger, described exhaust fan and described air exhaust heat exchange device and be discharged to outdoor by indoor, this Defrost method is: under the heating mode of described new blower fan system, the outlet temperature of the air exhaust heat exchange device that detection is described; When the outlet temperature of the air exhaust heat exchange device described in detected is lower than the first design temperature, make described new blower fan system enter defrosting mode to run, including making described fresh-air fan with low cruise or out of service, described low speed be lower than described fresh-air fan rotating speed under described heating mode 50% rotating speed, make described exhaust fan run at high speed simultaneously, described high speed be higher than described exhaust fan rotating speed under described heating mode 10% rotating speed, and make described compressor out of service; When the time that described defrosting mode runs reach set defrosting time or detected described in the outlet temperature of air exhaust heat exchange device higher than the second design temperature time, described new blower fan system recovers described heating mode.
Preferably, the first described design temperature is lower than the second described design temperature.
Preferably, the first described design temperature is less than or equal to-3 DEG C; The second described design temperature is greater than or equal to 2 DEG C.
Preferably, described defrosting time is longer than or equal to 15min.
Preferably, after described new blower fan system is started shooting and operation one section heats the time under described heating mode, more described Defrost method is performed.
Preferably, the described time that heats is longer than or equal to 30min.
Preferably, outlet temperature sensor is set in the exit of described air exhaust heat exchange device to detect the outlet temperature of described air exhaust heat exchange device.
Owing to technique scheme is used, the present invention compared with prior art has the advantage that 1, this Defrost method can run under heating mode in the winter time, solves the frosting problem of air exhaust heat exchange device and main heat exchanger; 2, this Defrost method is it can be avoided that there is the noise that the switching of cross valve brings; 3, this Defrost method runs in a heating mode, it is possible to prevent the problem that the too low indoor temperature caused of new air temperature reduces.
Accompanying drawing explanation
Accompanying drawing 1 is the schematic diagram of existing new blower fan system.
In the figures above: 1, compressor; 2, air exhaust heat exchange device; 3, fresh air heat exchanger; 4, main heat exchanger; 5, fresh-air fan; 6, exhaust fan; 7, cross valve; 8, throttling arrangement; 9, medium temperature sensor; 10, inlet temperature sensor; 11, outlet temperature sensor.
Detailed description of the invention
Below in conjunction with embodiment shown in the drawings, the invention will be further described.
Embodiment one: the Defrost method of a kind of new blower fan system, it can apply in new blower fan system as shown in Figure 1.
This new blower fan system includes compressor 1, air exhaust heat exchange device 2, fresh air heat exchanger 3, main heat exchanger 4, fresh-air fan 5 and exhaust fan 6. The relative fresh air heat exchanger 3 of fresh-air fan 5 is arranged, and the relative air exhaust heat exchange device 2 of exhaust fan 6 is arranged. Compressor 1, air exhaust heat exchange device 2 and fresh air heat exchanger 3 are connected as loop by pipeline, and this loop is additionally provided with cross valve 7 and throttling arrangement 8. Main heat exchanger 4 can adopt plate type heat exchanger. This new blower fan system can also arrange multiple temperature sensor, for instance the medium temperature sensor 9 of detection fresh air heat exchanger 3 medium temperature, the inlet temperature sensor 10 etc. of detection fresh air heat exchanger 3 intake air temperature.
New wind subsystem that new wind is constituted through main heat exchanger 4, fresh-air fan 5 and fresh air heat exchanger 3 and by outdoor inlet chamber, return air subsystem that return air is constituted through main heat exchanger 4, exhaust fan 6 and air exhaust heat exchange device 2 and be discharged to outdoor by indoor.
During winter, open this new blower fan system and run heating mode. Start shooting when new blower fan system and run one section in a heating mode and heat time t1(t1 >=30min) after, perform Defrost method.
The Defrost method that this new blower fan system adopts is: arrange outlet temperature sensor 11 in the exit of air exhaust heat exchange device 2 to detect the outlet temperature of air exhaust heat exchange device 2. Under the heating mode of new blower fan system, when the outlet temperature of detected air exhaust heat exchange device 2 is lower than the first design temperature T1, make new blower fan system enter defrosting mode to run, this defrosting mode includes making fresh-air fan 5 with low cruise or out of service, low speed be lower than fresh-air fan 5 rotating speed in a heating mode 50% rotating speed, make exhaust fan 6 run at high speed simultaneously, be at a high speed higher than exhaust fan 6 rotating speed in a heating mode 10% rotating speed, and make compressor 1 out of service. And when the time that defrosting mode runs reaches the outlet temperature of set defrosting time t2 or detected air exhaust heat exchange device 2 higher than the second design temperature T2, new blower fan system recovers heating mode.
First design temperature T1 should lower than the second design temperature T2. If the first design temperature T1 is less than or equal to-3 DEG C, the second design temperature T2 is greater than or equal to 2 DEG C. Defrosting time t2 is then longer than or equal to 15min.
When running defrosting mode, due to fresh-air fan 5 low cruise or out of service, and exhaust fan 6 high-speed cruising so that the outlet temperature of air exhaust heat exchange device 2 gradually rises, to reach the effect of defrosting.And when the time that defrosting mode runs reaches set defrosting time t2 or the second set design temperature T2, then the frost tied on main heat exchanger 4 and air exhaust heat exchange device 2 is removed substantially, it is possible to continue properly functioning heating mode. Above-mentioned heat time t1, defrosting time t2, the first design temperature T1, the second design temperature T2 can be set in the control device of new blower fan system according to practical situation, and controlled the ruuning situation of new blower fan system by this control device.
Above-described embodiment only for technology design and the feature of the present invention are described, its object is to allow person skilled in the art will appreciate that present disclosure and to implement according to this, can not limit the scope of the invention with this. All equivalences made according to spirit of the invention change or modify, and all should be encompassed within protection scope of the present invention.
Claims (7)
1. the Defrost method of a new blower fan system, it is applied in new blower fan system, described new blower fan system includes compressor, air exhaust heat exchange device, fresh air heat exchanger, main heat exchanger, fresh-air fan, exhaust fan, the fresh air heat exchanger setting that described fresh-air fan is relatively described, the air exhaust heat exchange device setting that described exhaust fan is relatively described, described compressor, described air exhaust heat exchange device and described fresh air heat exchanger are connected as loop by pipeline; New wind subsystem that new wind is constituted through described main heat exchanger, described fresh-air fan and described fresh air heat exchanger and by outdoor inlet chamber, return air subsystem that return air is constituted through described main heat exchanger, described exhaust fan and described air exhaust heat exchange device and be discharged to outdoor by indoor, it is characterized in that: this Defrost method is: under the heating mode of described new blower fan system, the outlet temperature of the air exhaust heat exchange device that detection is described; When the outlet temperature of the air exhaust heat exchange device described in detected is lower than the first design temperature, make described new blower fan system enter defrosting mode to run, including making described fresh-air fan with low cruise or out of service, described low speed be lower than described fresh-air fan rotating speed under described heating mode 50% rotating speed, make described exhaust fan run at high speed simultaneously, described high speed be higher than described exhaust fan rotating speed under described heating mode 10% rotating speed, and make described compressor out of service; When the time that described defrosting mode runs reach set defrosting time or detected described in the outlet temperature of air exhaust heat exchange device higher than the second design temperature time, described new blower fan system recovers described heating mode.
2. the Defrost method of new blower fan system according to claim 1, it is characterised in that: the first described design temperature is lower than the second described design temperature.
3. the Defrost method of new blower fan system according to claim 2, it is characterised in that: the first described design temperature is less than or equal to-3 DEG C; The second described design temperature is greater than or equal to 2 DEG C.
4. the Defrost method of new blower fan system according to claim 1, it is characterised in that: described defrosting time is longer than or equal to 15min.
5. the Defrost method of new blower fan system according to claim 1, it is characterised in that: after described new blower fan system is started shooting and operation one section heats the time under described heating mode, then perform described Defrost method.
6. the Defrost method of new blower fan system according to claim 5, it is characterised in that: the described time that heats is longer than or equal to 30min.
7. the Defrost method of new blower fan system according to claim 1, it is characterised in that: outlet temperature sensor is set in the exit of described air exhaust heat exchange device to detect the outlet temperature of described air exhaust heat exchange device.
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| CN201410028286.4A CN103742987B (en) | 2014-01-22 | 2014-01-22 | The Defrost method of new blower fan system |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP6498320B2 (en) * | 2016-01-08 | 2019-04-10 | 三菱電機株式会社 | Ventilation device and defrosting method |
| CN107894061B (en) * | 2017-10-23 | 2020-04-17 | 合肥美的暖通设备有限公司 | Fresh air conditioner, defrosting method and computer readable storage medium |
| WO2019194063A1 (en) * | 2018-04-02 | 2019-10-10 | 三菱電機株式会社 | Air conditioner ventilation device and air conditioner ventilation method |
| CN110686361A (en) * | 2019-10-15 | 2020-01-14 | 广东美的暖通设备有限公司 | Fresh air machine control method, fresh air machine and computer readable storage medium |
| CN110726227A (en) * | 2019-10-28 | 2020-01-24 | 广东美的暖通设备有限公司 | Defrosting control method, device and system for fresh air fan system |
| CN111023456B (en) * | 2019-12-27 | 2022-01-25 | 宁波奥克斯电气股份有限公司 | Control method and device for fresh air of air conditioner, air conditioner and storage medium |
| CN113028692A (en) * | 2021-03-31 | 2021-06-25 | 东北大学 | Direct type electromagnetic induction heating heat pump defrosting device and method |
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| CN87105945A (en) * | 1986-12-26 | 1988-07-06 | 松下电器产业株式会社 | The method for controlling of operation of air conditioner of heat pump type |
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Effective date of registration: 20170119 Address after: 310018, Zhejiang, Hangzhou economic and Technological Development Zone, No. 12, No. 289, No. three, No. 6 Industrial Park, garden building, 2F Patentee after: Hangzhou Xiantu Electronic Co., Ltd. Address before: Xinping street Suzhou City Industrial Park 215125 Jiangsu province No. 388 innovation park off Tower room C3A03 Patentee before: Suzhou Xiangjian Intelligent Science & Technology Co., Ltd. |