CN103822418A - Quasi-two-stage compression heat pump system and control method thereof - Google Patents
Quasi-two-stage compression heat pump system and control method thereof Download PDFInfo
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- CN103822418A CN103822418A CN201210470312.XA CN201210470312A CN103822418A CN 103822418 A CN103822418 A CN 103822418A CN 201210470312 A CN201210470312 A CN 201210470312A CN 103822418 A CN103822418 A CN 103822418A
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- 230000006835 compression Effects 0.000 title claims abstract description 47
- 238000007906 compression Methods 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000007921 spray Substances 0.000 claims description 83
- 238000002347 injection Methods 0.000 abstract 5
- 239000007924 injection Substances 0.000 abstract 5
- 239000003507 refrigerant Substances 0.000 description 9
- 230000001105 regulatory effect Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009897 systematic effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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Abstract
The invention provides a quasi-two-stage compression heat pump system and a control method thereof. The control method of the quasi-two-stage compression heat pump system comprises the following steps: acquiring a target superheat value; acquiring a first temperature value on a connecting pipeline between the flash evaporator and the enthalpy injection valve; acquiring a second temperature value on a connecting pipeline between the compressor and the enthalpy injection valve; calculating an actual superheat value according to a difference between the first temperature value and the second temperature value; and adjusting the opening degree of a first-stage flow adjusting device of the quasi-two-stage compression heat pump system according to the target superheat value and the actual superheat value, so that when the system opens the enthalpy injection valve, the intermediate pressure after the first-stage throttling by the first-stage flow adjusting device is always greater than or equal to the pressure of a medium-pressure cavity of the compressor. The invention can prevent the quasi-two-stage compression system from generating reverse injection when the injection enthalpy valve is opened.
Description
Technical field
The present invention relates to technical field of heat pumps, in particular to the accurate secondary compression heat pump system of one and control method thereof.
Background technology
If heat pump adopts two-stage compression, be conducive to reduce the pressure ratio of system, improve systematic function.Existing accurate two-stage compression system is generally that spray enthalpy magnetic valve is set before compressor gas supplementing opening, under the lower condition of environment temperature, open spray enthalpy magnetic valve, improve system heating capacity by the approach that increases system refrigerant internal circulating load, but in the time that spray enthalpy magnetic valve is opened, when pressure before the pressure of pressing chamber in compressor is higher than spray enthalpy electronic valve, in compressor, press chamber can produce contrary spray, be that cold-producing medium can be pressed chamber ejection from compressor, reduce systematic function, bring adverse influence to compressor reliability service simultaneously.Usual settling mode is to increase a check valve before spray enthalpy valve at present, but this can not solve the problem of pressing the contrary spray in chamber in compressor completely.
Summary of the invention
The present invention aims to provide a kind of accurate secondary compression heat pump system control method that can prevent the contrary spray of generation in the time that spray enthalpy valve is opened of accurate two-stage compression system.
To achieve these goals, according to an aspect of the present invention, provide a kind of accurate secondary compression heat pump system control method, comprised the following steps: obtain target super heat value; Obtain the first temperature value on the connecting line between flash vessel and spray enthalpy valve; Obtain the second temperature value on the connecting line between compressor and spray enthalpy valve; Calculate actual super heat value according to the difference between the first temperature value and the second temperature value; And regulate the aperture of the first order flow regulator of accurate secondary compression heat pump system according to target super heat value and actual super heat value, while making system open spray enthalpy valve, the intermediate pressure after first order flow regulator carries out one-level throttling is more than or equal to the pressure in the middle pressure chamber of compressor all the time.
Further, obtaining in the step of target super heat value, the target super heat value obtaining determines by outdoor environment temperature, wherein: in the time of outdoor environment temperature >=20 ℃, target super heat value=1 ℃; In the time of 20 ℃ of 10 ℃≤outdoor environment temperature <, target super heat value=3 ℃; In the time of 10 ℃ of outdoor environment temperature <, target super heat value=2 ℃.
Further, the first temperature value obtaining on the connecting line between flash vessel and spray enthalpy valve comprises the following steps: on the connecting line between flash vessel and spray enthalpy valve, the first temperature sensing device is set; And obtain the first temperature value on the connecting line between flash vessel and spray enthalpy valve according to the first temperature sensing device.
Further, the second temperature value obtaining on the connecting line between compressor and spray enthalpy valve comprises the following steps: on the connecting line between compressor and spray enthalpy valve, the second temperature sensing device is set; And obtain the second temperature value on the connecting line between compressor and spray enthalpy valve according to the second temperature sensing device.
Further, the distance between the second temperature sensing device and spray enthalpy valve equals the distance between the first temperature sensing device and spray enthalpy valve.
Further, the distance between the second temperature sensing device and spray enthalpy valve is 10 centimetres, and the distance between the first temperature sensing device and spray enthalpy valve is 10 centimetres.
Further, determine that according to target super heat value and actual super heat value the aperture of the first order flow regulator of accurate secondary compression heat pump system comprises the following steps: actual super heat value < target super heat value, first order flow regulator aperture increases; The actual super heat value of target super heat value <, first order flow regulator aperture reduces; And target super heat value=actual super heat value, first order flow regulator aperture is constant.
Further, the aperture computing formula of first order flow regulator is: current aperture=original aperture+variation aperture; Wherein change the difference of aperture corresponding to actual super heat value and target super heat value.
According to another aspect of the present invention, provide a kind of accurate secondary compression heat pump system, having comprised: the first acquisition module, for obtaining target super heat value; The second acquisition module, for obtaining the first temperature value on the connecting line between flash vessel and spray enthalpy valve; The 3rd acquisition module, for obtaining the second temperature value on the connecting line between compressor and spray enthalpy valve; Computing module, for calculating actual super heat value according to the difference between the first temperature value and the second temperature value; And adjustment module, for regulate the aperture of the first order flow regulator of accurate secondary compression heat pump system according to target super heat value and actual super heat value, while making system open spray enthalpy valve, the intermediate pressure after one-level throttling is more than or equal to the pressure in the middle pressure chamber of compressor all the time.
Further, the second acquisition module is included in the first temperature sensing device arranging on the connecting line between flash vessel and spray enthalpy valve.
Further, the 3rd acquisition module is included in the second temperature sensing device arranging on the connecting line between compressor and spray enthalpy valve.
Apply technical scheme of the present invention, by obtaining target super heat value, obtain the first temperature value on the connecting line between flash vessel and spray enthalpy valve, obtain the second temperature value on the connecting line between compressor and spray enthalpy valve, determine the aperture of the first order flow regulator of accurate secondary compression heat pump system according to described target super heat value and described actual super heat value, and then regulate the step-down of the one-level throttling of accurate two-stage compression system, while making system open spray enthalpy valve, intermediate pressure after first order flow regulator carries out one-level throttling is more than or equal to the pressure in the middle pressure chamber of compressor all the time, thereby prevent from pressing in compressor chamber contrainjection, the performance of limited raising system spray enthalpy, increase the reliability of compressor.
Accompanying drawing explanation
The Figure of description that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the schematic diagram of accurate secondary compression heat pump system according to an embodiment of the invention; And
Fig. 2 shows the control flow chart of accurate secondary compression heat pump system according to an embodiment of the invention.
The specific embodiment
Describe below with reference to the accompanying drawings and in conjunction with the embodiments the present invention in detail.It should be noted that, in the situation that not conflicting, the feature in embodiment and embodiment in the application can combine mutually.
As shown in Figure 1, according to embodiments of the invention, a kind of accurate secondary compression heat pump system is provided, has comprised compressor 10, cross valve 20, condenser 30, first flow adjusting device 40, flash vessel 50, second quantity regulating device 60, evaporimeter 70, the first temperature sensing device 91 and the second temperature sensing device 92.
The first end interface 30a of condenser 30 is optionally connected with the second air entry 10b or exhaust outlet 10c, the second end interface 30b of condenser 30 is connected with the second interface 50b of flash vessel 50, the first interface 50a of flash vessel 50 is connected with the first air entry 10a of compressor 10, between first interface 50a and the first air entry 10a, form the spray enthalpy pipeline of compressor 10, the 3rd interface 50c of flash vessel 50 is connected with the first end interface 70a of evaporimeter 70, the second end interface 70b of evaporimeter 70 is optionally connected with the second air entry 10b or the exhaust outlet 10c of compressor 10.
On the spray enthalpy pipeline that spray enthalpy valve 93 is arranged between the first air entry 10a and first interface 50a, this spray enthalpy valve 93 is magnetic valve.The first temperature sensing device 91 is arranged on the connecting line between spray enthalpy valve 93 and flash vessel 50, the second temperature sensing device 92 is arranged on the connecting line between spray enthalpy valve 93 and compressor 10, and the distance between the first temperature sensing device 91 and spray enthalpy valve 93 equates with the distance between the second temperature sensing device 92 and spray enthalpy valve 93.
Preferably, the distance between the first temperature sensing device 91 and spray enthalpy valve 93 is 10 centimetres.Distance between the second temperature sensing device 92 and spray enthalpy valve 93 is 10 centimetres.
First flow adjusting device 40 is arranged on the connecting line between the second end interface 30b of condenser 30 and the second interface 50b of flash vessel 50, and second quantity regulating device 60 is arranged on the connecting line between the 3rd interface 50c of flash vessel 50 and the first end interface 70a of evaporimeter 70.
The first flow adjusting device 40 here and second quantity regulating device 60, all for reducing pressure by regulating flow, can be selected electric expansion valve; Second quantity regulating device 60 also can be selected capillary.
In the time heating or produce hot water, the first end interface 30a of condenser 30 is connected with the exhaust outlet 10c of compressor 10, the 4th end interface 70b of evaporimeter 70 and the second air entry 10b of compressor 10 are connected simultaneously, the HTHP gaseous coolant that now the exhaust outlet 10c of compressor 10 discharges enters condenser 30 and carries out heat exchange, and now condenser 30 plays the effect of condensation refrigerant.Refrigerant enters flash vessel 50 by the second interface 50b after first flow adjusting device 40 is carried out reducing pressure by regulating flow, and now first flow adjusting device 40 is as the first order flow regulator of accurate secondary compression heat pump system.Refrigerant is divided into two-way in flash vessel 50, the spray enthalpy pipeline of leading up to enters the first air entry 10a of compressor 10, and then enter the middle pressure chamber of compressor 10, another road refrigerant continues after reducing pressure by regulating flow by second quantity regulating device 60, enter evaporimeter 70 and carry out heat exchange, now evaporimeter 70 plays the refrigerant evaporation effect that makes.Then the low pressure chamber that refrigerant enters compressor 10 through the second air entry 10b of compressor 10, after completing one-level compression, compressor 10 inside enter middle pressure chamber, the refrigerant entering with the first air entry 10a mixes, then carry out two-stage compression, discharge by exhaust outlet 10c again, so move in circles, complete the process that heats or produce hot water of accurate secondary compression heat pump system.
In order to make the conversion of accurate secondary compression heat pump system between two duties more smooth and easy, between the first end interface 30a of the second air entry 10b, exhaust outlet 10c, condenser 30 and the second end interface 70b of evaporimeter 70, be connected with cross valve 20 so that between the second air entry 10b, exhaust outlet 10c, condenser 30 and evaporimeter 70 in different connected states.
In order to prevent that the liquid in refrigerant from impacting the performance of compressor 10, is provided with gas-liquid separator 80 on compressor air suction pipeline.
In conjunction with referring to Fig. 4, the present invention also provides a kind of accurate secondary compression heat pump system control method, comprises the following steps:
S100. obtain target super heat value;
S200. obtain the first temperature value T on the connecting line between flash vessel 50 and spray enthalpy valve 93
1;
S300. obtain the second temperature value T on the connecting line between compressor 10 and spray enthalpy valve 93
2;
S400. according to the first temperature value T
1with the second temperature value T
2between difference, i.e. T
1-T
2calculate actual super heat value; And
S500. according to the aperture of the first order flow regulator of described target super heat value and the described accurate secondary compression heat pump system of described actual super heat value adjusting, while making system open spray enthalpy valve, the intermediate pressure after first order flow regulator carries out one-level throttling is more than or equal to the pressure in the middle pressure chamber of compressor all the time.
Wherein target super heat value is relevant from different outdoor environment temperatures, particularly:
When outdoor environment temperature >=20 ℃, target super heat value=1 ℃;
When 20 ℃ of 10 ℃≤outdoor environment temperature <, target super heat value=3 ℃;
When 10 ℃ of outdoor environment temperature <, target super heat value=2 ℃.
According to a preferred embodiment of the present invention, the first temperature value T1 that S200. obtains on the connecting line between flash vessel 50 and spray enthalpy valve 93 comprises the following steps:
S210. on the connecting line between flash vessel 50 and spray enthalpy valve 93, the first temperature sensing device 91 is set; And
S220. obtain the first temperature value T1 on the connecting line between flash vessel 50 and spray enthalpy valve 93 according to the first temperature sensing device 91.
Preferably, in order to obtain good effect, the distance between the first temperature sensing device 91 and spray enthalpy valve 93 is 10 centimetres.
According to another preferred embodiment of the present invention, S300. obtains the second temperature value T on the connecting line between compressor 10 and spray enthalpy valve 93
2comprise the following steps:
S310. on the connecting line between compressor 10 and spray enthalpy valve 93, the second temperature sensing device 92 is set; And
S320. obtain the second temperature value T2 on the connecting line between compressor 10 and spray enthalpy valve 93 according to the second temperature sensing device 92.
Preferably, in order to obtain good effect, the distance between the second temperature sensing device 92 and spray enthalpy valve 93 is 10 centimetres.
Core of the present invention is that the spray enthalpy valve forward and backward 10cm left and right place on spray enthalpy pipeline arranges respectively the first temperature sensing device and the second temperature sensing device, and first order flow regulator preferably adopts electric expansion valve, its aperture is to control according to the temperature T 1 of the first temperature sensing device and the second temperature sensing device impression and the difference of T2.
According to another preferred embodiment of the present invention, S500. according to the aperture of the first order flow regulator of described target super heat value and the described accurate secondary compression heat pump system of described actual super heat value adjusting, while making system open spray enthalpy valve, the pressure that the intermediate pressure after first order flow regulator carries out one-level throttling is more than or equal to the middle pressure chamber of compressor all the time comprises the following steps:
When actual super heat value < target super heat value, first order flow regulator aperture increases;
When the actual super heat value of target super heat value <, first order flow regulator aperture reduces; And
When target super heat value=actual super heat value, first order flow regulator aperture is constant.
The input parameter of controlling first order flow regulator has: the T1 that the first temperature sensing device 91 obtains, T2, the environment temperature Te that the second temperature sensing device 92 obtains, the aperture Pi of previous time period first order flow regulator, and the aperture computing formula of current first order flow regulator is:
Current aperture P
i+1=original aperture Pi+ changes aperture Δ P
1;
Wherein change aperture Δ P
1corresponding to the difference of actual super heat value-target super heat value gained.
For example: when | actual super heat value-target super heat value |=1 ℃ time, first order flow regulator step number changes 1 step.
Accordingly, the present invention also provides a kind of accurate secondary compression heat pump system, comprises the first acquisition module, the second acquisition module, the 3rd acquisition module, computing module and adjustment module.Wherein the first acquisition module is used for obtaining target super heat value; The second acquisition module is for obtaining the first temperature value on the connecting line between flash vessel 50 and spray enthalpy valve 93; The 3rd acquisition module is for obtaining the second temperature value on the connecting line between compressor 10 and spray enthalpy valve 93; Computing module is for calculating actual super heat value according to the difference between the first temperature value and the second temperature value; Adjustment module is for regulating the aperture of the first order flow regulator of accurate secondary compression heat pump system according to target super heat value and actual super heat value, when the system of making is opened spray enthalpy valve 93, the intermediate pressure after one-level throttling is more than or equal to the pressure in the middle pressure chamber of compressor 10 all the time.
Preferably, the second acquisition module is included in the first temperature sensing device 91 arranging on the connecting line between flash vessel 50 and spray enthalpy valve 93; The 3rd acquisition module is included in the second temperature sensing device 92 arranging on the connecting line between compressor 10 and spray enthalpy valve 93.
From above description, can find out, the above embodiments of the present invention have realized following technique effect: by obtaining target super heat value, obtain the first temperature value on the connecting line between flash vessel and spray enthalpy valve, obtain the second temperature value on the connecting line between compressor and spray enthalpy valve, determine the aperture of the first order flow regulator of accurate secondary compression heat pump system according to described target super heat value and described actual super heat value, and then regulate the step-down of the one-level throttling of accurate two-stage compression system, while making system open spray enthalpy valve, intermediate pressure after first order flow regulator carries out one-level throttling is more than or equal to the pressure in the middle pressure chamber of compressor all the time, thereby prevent from pressing in compressor chamber contrainjection, the performance of limited raising system spray enthalpy, increase the reliability of compressor.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (11)
1. an accurate secondary compression heat pump system control method, is characterized in that, comprises the following steps:
Obtain target super heat value;
Obtain the first temperature value on the connecting line between flash vessel and spray enthalpy valve;
Obtain the second temperature value on the connecting line between compressor and spray enthalpy valve;
Calculate actual super heat value according to the difference between described the first temperature value and described the second temperature value; And
According to the aperture of the first order flow regulator of described target super heat value and the described accurate secondary compression heat pump system of described actual super heat value adjusting, while making system open spray enthalpy valve, carry out through the described first order flow regulator pressure that intermediate pressure after one-level throttling is more than or equal to the middle pressure chamber of compressor all the time.
2. accurate secondary compression heat pump system control method according to claim 1, is characterized in that, obtaining in the step of target super heat value, the target super heat value obtaining determines by outdoor environment temperature, wherein:
In the time of outdoor environment temperature >=20 ℃, described target super heat value=1 ℃;
In the time of 20 ℃ of 10 ℃≤outdoor environment temperature <, described target super heat value=3 ℃;
In the time of 10 ℃ of outdoor environment temperature <, described target super heat value=2 ℃.
3. accurate secondary compression heat pump system control method according to claim 1, is characterized in that, described in the first temperature value of obtaining on the connecting line between flash vessel and spray enthalpy valve comprise the following steps:
On the connecting line between described flash vessel and described spray enthalpy valve, the first temperature sensing device is set; And
Obtain the first temperature value on the connecting line between described flash vessel and described spray enthalpy valve according to described the first temperature sensing device.
4. accurate secondary compression heat pump system control method according to claim 3, is characterized in that, described in the second temperature value of obtaining on the connecting line between compressor and spray enthalpy valve comprise the following steps:
On the connecting line between described compressor and described spray enthalpy valve, the second temperature sensing device is set; And
Obtain the second temperature value on the connecting line between described compressor and described spray enthalpy valve according to described the second temperature sensing device.
5. accurate secondary compression heat pump system control method according to claim 4, is characterized in that, the distance between described the second temperature sensing device and described spray enthalpy valve equals the distance between described the first temperature sensing device and described spray enthalpy valve.
6. accurate secondary compression heat pump system control method according to claim 5, is characterized in that, the distance between described the second temperature sensing device and described spray enthalpy valve is 10 centimetres, and the distance between described the first temperature sensing device and described spray enthalpy valve is 10 centimetres.
7. according to the accurate secondary compression heat pump system control method described in any one in claim 1 to 6, it is characterized in that, described in
Determine that according to described target super heat value and described actual super heat value the aperture of the first order flow regulator of accurate secondary compression heat pump system comprises the following steps:
Actual super heat value < target super heat value, first order flow regulator aperture increases;
The actual super heat value of target super heat value <, first order flow regulator aperture reduces; And
Target super heat value=actual super heat value, first order flow regulator aperture is constant.
8. accurate secondary compression heat pump system control method according to claim 7, is characterized in that, the aperture computing formula of described first order flow regulator is:
Current aperture=original aperture+variation aperture;
Wherein change the difference of aperture corresponding to described actual super heat value and target super heat value.
9. an accurate secondary compression heat pump system, is characterized in that, comprising:
The first acquisition module, for obtaining target super heat value;
The second acquisition module, for obtaining the first temperature value on the connecting line between flash vessel and spray enthalpy valve;
The 3rd acquisition module, for obtaining the second temperature value on the connecting line between compressor and spray enthalpy valve;
Computing module, for calculating actual super heat value according to the difference between described the first temperature value and described the second temperature value; And
Adjustment module, be used for according to the aperture of the first order flow regulator of described target super heat value and the described accurate secondary compression heat pump system of described actual super heat value adjusting, while making system open spray enthalpy valve, the intermediate pressure after one-level throttling is more than or equal to the pressure in the middle pressure chamber of compressor all the time.
10. accurate secondary compression heat pump system according to claim 9, is characterized in that, described the second acquisition module is included in the first temperature sensing device arranging on the connecting line between described flash vessel and described spray enthalpy valve.
11. accurate secondary compression heat pump systems according to claim 9, is characterized in that, described the 3rd acquisition module is included in the second temperature sensing device arranging on the connecting line between described compressor and described spray enthalpy valve.
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| CN105371548A (en) * | 2015-12-11 | 2016-03-02 | 珠海格力电器股份有限公司 | Air-supplementing enthalpy-increasing control method, equipment and device for two-stage compressor |
| CN105485989A (en) * | 2015-12-14 | 2016-04-13 | 珠海格力电器股份有限公司 | Two-stage compression air conditioning system and air supply control method thereof |
| CN106931546A (en) * | 2017-03-27 | 2017-07-07 | 广东美的制冷设备有限公司 | A kind of heat pump sprays enthalpy system and its control method, air-conditioner |
| CN106931545A (en) * | 2017-03-27 | 2017-07-07 | 广东美的制冷设备有限公司 | A kind of heat pump sprays enthalpy system and its control method, air-conditioner |
| CN107676998A (en) * | 2017-09-15 | 2018-02-09 | 广东芬尼克兹节能设备有限公司 | A kind of double degree of superheat control dehumidification systems and method |
| CN111578547A (en) * | 2020-05-28 | 2020-08-25 | 珠海格力电器股份有限公司 | Double-backheating refrigerating system and control method thereof |
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| CN105371548A (en) * | 2015-12-11 | 2016-03-02 | 珠海格力电器股份有限公司 | Air-supplementing enthalpy-increasing control method, equipment and device for two-stage compressor |
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| CN106931545B (en) * | 2017-03-27 | 2023-10-27 | 广东美的制冷设备有限公司 | Heat pump enthalpy-spraying system, control method thereof and air conditioner |
| CN106931546B (en) * | 2017-03-27 | 2023-10-31 | 广东美的制冷设备有限公司 | Heat pump enthalpy-spraying system, control method thereof and air conditioner |
| CN107676998A (en) * | 2017-09-15 | 2018-02-09 | 广东芬尼克兹节能设备有限公司 | A kind of double degree of superheat control dehumidification systems and method |
| CN111578547A (en) * | 2020-05-28 | 2020-08-25 | 珠海格力电器股份有限公司 | Double-backheating refrigerating system and control method thereof |
| CN111578547B (en) * | 2020-05-28 | 2021-06-08 | 珠海格力电器股份有限公司 | Control method of double-backheating refrigerating system |
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