CN103742987A - Defrosting method of fresh-air machine system - Google Patents
Defrosting method of fresh-air machine system Download PDFInfo
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- CN103742987A CN103742987A CN201410028286.4A CN201410028286A CN103742987A CN 103742987 A CN103742987 A CN 103742987A CN 201410028286 A CN201410028286 A CN 201410028286A CN 103742987 A CN103742987 A CN 103742987A
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Abstract
The invention relates to a defrosting method of a fresh-air machine system. The defrosting method is applied to the fresh-air machine system. The defrosting method includes: detecting the outlet temperature of an air exhausting heat exchanger under the mode of heating of the fresh-air machine system; when the outlet temperature of the air exhausting heat exchanger is lower than a first set temperature, enabling the fresh-air machine system to enter and run in the defrosting mode, namely enabling a fresh-air fan to run at a low speed for stop running, enabling an air exhausting fan to run at a high speed, and enabling a compressor to stop running; when the time of the defrosting mode reaches the set defrosting time or the detected outlet temperature of the air exhausting heat exchanger is higher than a second set temperature, allowing the fresh-air machine system to restore to the heating mode. By the application of the method, the problem about frosting of the air exhausting heat exchanger and a main heat exchanger can be solved under the winter running heating mode, noises brought by switching of a four-way valve can be avoided, and indoor temperature reduction caused by the fact that fresh air is too low in temperature can be prevented.
Description
Technical field
The present invention relates to a kind of method being applied to while heating in the winter time in new blower fan system frosting is removed on main heat exchanger and air exhaust heat exchange device.
Background technology
Existing new blower fan system as shown in Figure 1, it comprises compressor, air exhaust heat exchange device, fresh air heat exchanger, plate type heat exchanger (main heat exchanger), new wind blower fan, exhaust fan, the new relative fresh air heat exchanger setting of wind blower fan, the relative air exhaust heat exchange device of exhaust fan arranges, compressor, air exhaust heat exchange device and fresh air heat exchanger are connected to loop by pipeline, are also provided with cross valve and throttling arrangement on this loop.
During summer, new blower fan system moves with refrigeration mode, from the new wind of 26 ℃ ~ 43 ℃ of outdoor introducing and 24 ℃ ~ 26 ℃ indoor return air, first plate type heat exchanger, carry out exchange heat, the temperature of new wind is down to below 35 ℃, then new wind carries out heat exchange via fresh air heat exchanger, now fresh air heat exchanger is equivalent to evaporimeter, final new eolian for temperature constant be the indoor fresh air of 20 ℃ ~ 26 ℃, and return air through plate type heat exchanger and temperature rise to 30 ℃ above after, via air exhaust heat exchange device, carry out heat exchange, now air exhaust heat exchange device is equivalent to condenser, return air the most at last heat is discharged by outdoor exhaust outlet.
During winter, new blower fan system moves with heating mode, from the new wind of-5 ℃ ~ 20 ℃ of outdoor introducing and the indoor return air of 20 ℃ ~ 24 ℃, plate type heat exchanger, carry out exchange heat, more than the temperature rise to 10 of new wind degree Celsius, then via fresh air heat exchanger, carry out heat exchange, now fresh air heat exchanger is equivalent to condenser, final new eolian for temperature constant be the indoor fresh air of 20 ℃ ~ 24 ℃, return air through plate type heat exchanger and temperature drop to 15 ℃ once after, via air exhaust heat exchange device, carry out heat exchange, now air exhaust heat exchange device is equivalent to evaporimeter, return air the most at last cold is discharged by outdoor exhaust outlet.
When above-mentioned refrigeration mode and heating mode conversion, need to switch cross valve.
During winter, because temperature is too low, may cause plate type heat exchanger and air exhaust heat exchange device (being now equivalent to evaporimeter) frosting.Now, the method for the existing defrosting that can adopt is, by the switching of cross valve, to force new blower fan system running refrigerating pattern, thereby defrost action.But there is following problem in existing this Defrost method:
1,, during forced refrigeration, can cause the temperature of indoor fresh air very low, thereby reduce indoor temperature;
2, during forced refrigeration, cross valve carries out switching can cause larger 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
The object of this invention is to provide a kind of deficiency that can overcome existing Defrost method, can when main heat exchanger and air exhaust heat exchange device are defrosted, can not reduce indoor temperature and can not produce the Defrost method of noise.
For achieving the above object, the technical solution used in the present invention is:
A kind of Defrost method of new blower fan system, be applied in new blower fan system, described new blower fan system comprises compressor, air exhaust heat exchange device, fresh air heat exchanger, main heat exchanger, new wind blower fan, exhaust fan, the fresh air heat exchanger setting that described new wind blower fan is relatively described, the relatively described air exhaust heat exchange device of described exhaust fan arranges, and described compressor, described air exhaust heat exchange device and described fresh air heat exchanger are connected to loop by pipeline; The new wind subsystem that new wind forms through described main heat exchanger, described new wind blower fan and described fresh air heat exchanger and by outdoor enter indoor, the return air subsystem that return air forms through described main heat exchanger, described exhaust fan and described air exhaust heat exchange device and by indoor be discharged to outdoor, this Defrost method is: under the heating mode of described new blower fan system, detect the outlet temperature of described air exhaust heat exchange device; When the outlet temperature of detected described air exhaust heat exchange device is during lower than the first design temperature, make described new blower fan system enter defrosting mode operation, comprise and make described new wind blower fan with low cruise or out of service, described low speed is 50% rotating speed of the rotating speed under described heating mode lower than described new wind blower fan, make described exhaust fan run at high speed simultaneously, described high speed is 10% rotating speed of the rotating speed under described heating mode higher than described exhaust fan, and makes described compressor out of service; The outlet temperature that reaches the defrosting time that sets or detected described air exhaust heat exchange device when the time of described defrosting mode operation is during higher than the second design temperature, and 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 ℃; The second described design temperature is greater than or equal to 2 ℃.
Preferably, described defrosting time is longer than or is equaled 15min.
Preferably, described new blower fan system is started shooting and under described heating mode, is moved one section and heats after the time, then carries out described Defrost method.
Preferably, the described time that heats is longer than or equals 30min.
Preferably, outlet temperature sensor be set detect the outlet temperature of described air exhaust heat exchange device in the exit of described air exhaust heat exchange device.
Because technique scheme is used, the present invention compared with prior art has following advantages: 1, this Defrost method can move 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 can be avoided the noise that the switching of cross valve brings; 3, this Defrost method moves under heating mode, can prevent the problem that the too low indoor temperature causing of new air temperature reduces.
Accompanying drawing explanation
The schematic diagram that accompanying drawing 1 is existing new blower fan system.
In above accompanying drawing: 1, compressor; 2, air exhaust heat exchange device; 3, fresh air heat exchanger; 4, main heat exchanger; 5, new wind blower fan; 6, exhaust fan; 7, cross valve; 8, throttling arrangement; 9, medium temperature sensor; 10, inlet temperature sensor; 11, outlet temperature sensor.
The specific embodiment
Below in conjunction with embodiment shown in the drawings, the invention will be further described.
Embodiment mono-: a kind of Defrost method of new blower fan system, it can be applied in new blower fan system as shown in Figure 1.
This new blower fan system comprises compressor 1, air exhaust heat exchange device 2, fresh air heat exchanger 3, main heat exchanger 4, new wind blower fan 5 and exhaust fan 6.The new relative fresh air heat exchanger 3 of wind blower fan 5 arranges, and the relative air exhaust heat exchange device 2 of exhaust fan 6 arranges.Compressor 1, air exhaust heat exchange device 2 and fresh air heat exchanger 3 are connected to loop by pipeline, are also provided with cross valve 7 and throttling arrangement 8 on this loop.Main heat exchanger 4 can adopt plate type heat exchanger.In this new blower fan system, multiple temperature sensors can also be set, for example, detect the medium temperature sensor 9 of fresh air heat exchanger 3 medium temperatures, detect the inlet temperature sensor 10 of fresh air heat exchanger 3 intake air temperature etc.
The new wind subsystem that new wind forms through main heat exchanger 4, new wind blower fan 5 and fresh air heat exchanger 3 and by outdoor enter indoor, the return air subsystem that return air forms through main heat exchanger 4, exhaust fan 6 and air exhaust heat exchange device 2 and by indoor be discharged to outdoor.
During winter, open this new blower fan system operation heating mode.When new blower fan system, start shooting and under heating mode, move one section and heat time t1(t1 >=30min) after, Defrost method carried out.
The Defrost method that this new blower fan system adopts is: the outlet temperature that in the exit of air exhaust heat exchange device 2, outlet temperature sensor 11 is set and detects 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 during lower than the first design temperature T1, make new blower fan system enter defrosting mode operation, this defrosting mode comprises makes new wind blower fan 5 with low cruise or out of service, low speed is 50% rotating speed of the rotating speed under heating mode lower than new wind blower fan 5, make exhaust fan 6 run at high speed simultaneously, be at a high speed 10% rotating speed of the rotating speed under heating mode higher than exhaust fan 6, and make compressor 1 out of service.And the outlet temperature that reaches the defrosting time t2 that sets or detected air exhaust heat exchange device 2 when the time of defrosting mode operation is during higher than the second design temperature T2, new blower fan system recovers heating mode.
The first design temperature T1 should be lower than the second design temperature T2.If the first design temperature T1 is less than or equal to-3 ℃, the second design temperature T2 is greater than or equal to 2 ℃.Defrosting time t2 is longer than or equals 15min.
When operation defrosting mode, due to new wind blower fan 5 low cruises or out of service, and exhaust fan 6 high-speed cruisings raise the outlet temperature of air exhaust heat exchange device 2 gradually, to reach the effect of defrosting.And when the time of defrosting mode operation reaches the defrosting time t2 setting or the second design temperature T2 setting, the frost of tying on main heat exchanger 4 and air exhaust heat exchange device 2 is removed substantially, can continue normally to have moved heating mode.Above-mentionedly 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 actual conditions, and by the ruuning situation of the new blower fan system of this control device control.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that Spirit Essence is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (7)
1. the Defrost method of a new blower fan system, be applied in new blower fan system, described new blower fan system comprises compressor, air exhaust heat exchange device, fresh air heat exchanger, main heat exchanger, new wind blower fan, exhaust fan, the fresh air heat exchanger setting that described new wind blower fan is relatively described, the relatively described air exhaust heat exchange device of described exhaust fan arranges, and described compressor, described air exhaust heat exchange device and described fresh air heat exchanger are connected to loop by pipeline; The new wind subsystem that new wind forms through described main heat exchanger, described new wind blower fan and described fresh air heat exchanger and by outdoor enter indoor, the return air subsystem that return air forms through described main heat exchanger, described exhaust fan and described air exhaust heat exchange device and by indoor be discharged to outdoor, it is characterized in that: this Defrost method is: under the heating mode of described new blower fan system, detect the outlet temperature of described air exhaust heat exchange device; When the outlet temperature of detected described air exhaust heat exchange device is during lower than the first design temperature, make described new blower fan system enter defrosting mode operation, comprise and make described new wind blower fan with low cruise or out of service, described low speed is 50% rotating speed of the rotating speed under described heating mode lower than described new wind blower fan, make described exhaust fan run at high speed simultaneously, described high speed is 10% rotating speed of the rotating speed under described heating mode higher than described exhaust fan, and makes described compressor out of service; The outlet temperature that reaches the defrosting time that sets or detected described air exhaust heat exchange device when the time of described defrosting mode operation is during higher than the second design temperature, and described new blower fan system recovers described heating mode.
2. the Defrost method of new blower fan system according to claim 1, is characterized 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, is characterized in that: the first described design temperature is less than or equal to-3 ℃; The second described design temperature is greater than or equal to 2 ℃.
4. the Defrost method of new blower fan system according to claim 1, is characterized in that: described defrosting time is longer than or is equaled 15min.
5. the Defrost method of new blower fan system according to claim 1, is characterized in that: described new blower fan system is started shooting and under described heating mode, moved one section and heats after the time, then carries out described Defrost method.
6. the Defrost method of new blower fan system according to claim 5, is characterized in that: the described time that heats is longer than or equals 30min.
7. the Defrost method of new blower fan system according to claim 1, is characterized in that: the outlet temperature that outlet temperature sensor is set detects described air exhaust heat exchange device in the exit 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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| CN201410028286.4A CN103742987B (en) | 2014-01-22 | 2014-01-22 | The Defrost method of new blower fan system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107894061A (en) * | 2017-10-23 | 2018-04-10 | 合肥美的暖通设备有限公司 | Fresh air conditioner-mechanical, defrosting method and computer-readable recording medium |
| 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 |
| CN111023456A (en) * | 2019-12-27 | 2020-04-17 | 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 |
| CN111886452A (en) * | 2018-04-02 | 2020-11-03 | 三菱电机株式会社 | Air conditioner ventilation device and air conditioner ventilation method |
| US10935269B2 (en) * | 2016-01-08 | 2021-03-02 | Mitsubishi Electric Corporation | Ventilator, and defrosting method |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10935269B2 (en) * | 2016-01-08 | 2021-03-02 | Mitsubishi Electric Corporation | Ventilator, and defrosting method |
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| CN111023456A (en) * | 2019-12-27 | 2020-04-17 | 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 |
| 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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| CN103742987B (en) | 2016-06-08 |
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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. |