CN109282522B - Temperature control method based on proportional control valve and air heat source pump with same - Google Patents
Temperature control method based on proportional control valve and air heat source pump with same Download PDFInfo
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- CN109282522B CN109282522B CN201811178174.1A CN201811178174A CN109282522B CN 109282522 B CN109282522 B CN 109282522B CN 201811178174 A CN201811178174 A CN 201811178174A CN 109282522 B CN109282522 B CN 109282522B
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- 238000000034 method Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 239000003507 refrigerant Substances 0.000 claims description 15
- 239000007788 liquid Substances 0.000 claims description 13
- 238000010438 heat treatment Methods 0.000 claims description 10
- 230000007613 environmental effect Effects 0.000 claims description 7
- 238000005057 refrigeration Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/06—Heat pumps characterised by the source of low potential heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a temperature control method based on a proportional control valve and an air heat source pump with the same. The air heat source pump comprises a water pump, an expansion water tank, a user terminal, an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compressor, a four-way valve, an outdoor heat exchanger and a throttle valve, the indoor unit comprises an indoor heat exchanger, a proportion adjusting valve is further arranged between the water outlet of the indoor unit and the expansion water tank, and the user terminal is provided with a temperature sensing bulb. According to the invention, the proportional control valve device is added between the water outlet of the unit and the return water expansion water tank, the proportional control valve can control the opening of the valve, and when the indoor actual temperature exceeds the indoor set temperature, the opening of the proportional control valve is increased and is in a linear relation with the difference value between the indoor actual temperature and the indoor set temperature. Energy waste is avoided, and user comfort is improved.
Description
Technical Field
The invention relates to a temperature control method, in particular to a temperature control method based on a proportional control valve and an air heat source pump with the same.
Background
In recent years, air source heat pump units have become widely used. Air source heat pump set can effectual improvement serious problem of northern haze, but because reasons such as northern heating cycle length, environment are abominable, the power consumptive total amount of unit is great, needs to optimize current air source heat pump system urgently, improves its thermal efficiency, makes the energy saving and emission reduction effect of unit more showing.
Because the load at the tail end of the air source heat pump hot and cold water unit is influenced by a plurality of factors such as building area, building maintenance structure, regional climate, living habits and the like, the single control water temperature is difficult to accurately control the room temperature, the fluctuation of the water temperature is large in the actual operation process of the unit, the indoor temperature of a user can exceed the set temperature, the part of heat exceeding the set temperature can be wasted, and the comfort of the user can also be reduced.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: in the actual operation process of the air source heat pump cold and hot water unit, the water temperature fluctuation is large, the indoor temperature of a user can exceed the set temperature, and the heat exceeding the set temperature is wasted and the comfort of the user can be reduced.
In order to solve the technical problems, the invention adopts the following technical means:
the invention provides a temperature control method based on a proportional control valve, which comprises the following steps:
setting the opening K of the proportional control valve at the initial time to be 0, and acquiring an environment set temperature T01 and an environment actual measurement temperature T02;
after the time T0, calculating the difference DeltaT between the environmental set temperature T01 and the environmental measured temperature T02,
in the heating mode: T02-T01;
in a refrigeration mode: T01-T02;
judging the relation between the delta T and the first set temperature T1, if the delta T is less than T1, keeping the opening K of the proportional regulating valve at 0, and after T0, judging the relation between the delta T and the first set temperature T1 again and correspondingly regulating the opening of the proportional regulating valve;
if the delta T is not less than T1, judging the relation between the delta T and a second set temperature T2, and if the T1 is not less than T2, adjusting the opening K of the proportional control valve according to the following method:
K＝(a△T)％K0；
wherein a is a proportionality coefficient; k0 is the opening degree of the proportional control valve when the proportional control valve is fully opened;
after T0 time, re-judging the relationship between the delta T and the first set temperature T1 and the second set temperature T2 and correspondingly adjusting the opening degree of the proportional control valve;
if the delta T is larger than T2, the opening K of the proportional control valve is adjusted to K0, after T0 time, the relation between the delta T and the first set temperature T1 and the relation between the delta T and the second set temperature T2 are judged again, and the opening of the proportional control valve is adjusted correspondingly.
Furthermore, the value range of t0 is 40 s-60 s.
Further, the first set temperature T1 is 0 ℃; the value range of the second set temperature T2 is 2-5 ℃.
Further, the environment set temperature T01 is a user set temperature, and the environment measured temperature T02 is an actual room temperature; or the environment set temperature T01 is a set outlet water temperature, and the environment measured temperature T02 is an actual outlet water temperature.
Furthermore, the value range of the proportionality coefficient a is 20-30.
The invention also provides an air heat source pump, which comprises a water pump, an expansion water tank, a user tail end, an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compressor, a four-way valve, an outdoor heat exchanger and a throttle valve, the indoor unit comprises an indoor heat exchanger, a proportion adjusting valve is also arranged between a water outlet of the indoor unit and the expansion water tank, the user tail end is provided with a temperature sensing bulb, and the proportion adjusting valve is adjusted by adopting the temperature control method.
Further, the bulb is installed at a position 1.2m high from the ground.
Further, the user sets the environmental set temperature T01 by hand operator.
Furthermore, a water inlet temperature sensing bulb is arranged at the water inlet end of the indoor heat exchanger, and a water outlet temperature sensing bulb is arranged at the water outlet end of the indoor heat exchanger.
Furthermore, in the heating mode, the compressor compresses the refrigerant into high-temperature high-pressure gas, the high-temperature high-pressure gas enters the indoor heat exchanger through the four-way valve to be condensed, the refrigerant transfers heat to the secondary refrigerant, high-pressure liquid coming out of the indoor heat exchanger enters the throttle valve to be reduced in pressure to be changed into low-pressure liquid, the low-pressure liquid passes through the outdoor heat exchanger to exchange heat with the external environment, and the low-temperature low-pressure gas is; the secondary refrigerant is divided into two paths from the indoor heat exchanger to the water pump, one path enters the tail end of a user to release heat, the other path directly enters the expansion water tank through the proportion regulating valve, and finally flows back to the indoor heat exchanger to exchange heat.
The invention has the following beneficial effects:
the proportional control valve is additionally arranged between the water outlet of the unit and the return water expansion tank, the proportional control valve can control the opening of the valve, and when the indoor actual temperature exceeds the indoor set temperature, the opening of the proportional control valve is increased and is in a linear relation with the difference value of the indoor actual temperature and the indoor set temperature. After the proportion regulating valve is added, part of heat does not directly enter the expansion water tank for heat storage through the tail end of a user, the redundant heat waste of the part is prevented, the fluctuation of the indoor environment temperature is also slowed down, and the comfort of the user is improved.
Drawings
FIG. 1 is a schematic system diagram of an air heat source pump according to the present invention;
FIG. 2 is a control flow diagram of a proportional control valve based temperature control method of the present invention;
fig. 3 is a proportional regulating valve opening variation curve.
The labels in the figure are: 1. a proportional regulating valve; 2. an expansion tank; 3. an indoor heat exchanger; 4. a four-way valve; 5. a variable frequency compressor; 6. an outdoor heat exchanger; 7. an electronic expansion valve; 8. a water pump; 9. an indoor thermal bulb; 10. a water inlet temperature sensing bulb; 11. and (4) discharging the water out of the thermal bulb.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
After the indoor temperature reaches the set temperature, the heat load required by the user terminal is reduced, and in order to enable the unit to operate stably and reliably, the variable frequency compressor is controlled to slow down the frequency under the ordinary condition, so that the indoor actual temperature exceeds the set temperature, the energy is wasted, and the comfort of the user is also reduced.
Based on the temperature control method, the invention provides a temperature control method based on a proportional control valve and an air heat source pump with the temperature control method.
The temperature control method of the invention comprises the following steps:
setting the opening K of the proportional control valve at the initial time to be 0, and acquiring an environment set temperature T01 and an environment actual measurement temperature T02;
after the time T0, calculating the difference DeltaT between the environmental set temperature T01 and the environmental measured temperature T02,
in the heating mode: T02-T01;
in a refrigeration mode: T01-T02;
judging the relation between the delta T and the first set temperature T1, if the delta T is less than T1, keeping the opening K of the proportional regulating valve at 0, and after T0, judging the relation between the delta T and the first set temperature T1 again and correspondingly regulating the opening of the proportional regulating valve;
if the delta T is not less than T1, judging the relation between the delta T and a second set temperature T2, and if the T1 is not less than T2, adjusting the opening K of the proportional control valve according to the following method:
K＝(a△T)％K0；
wherein a is a proportionality coefficient; k0 is the opening degree of the proportional control valve when the proportional control valve is fully opened;
after T0 time, re-judging the relationship between the delta T and the first set temperature T1 and the second set temperature T2 and correspondingly adjusting the opening degree of the proportional control valve;
if the delta T is larger than T2, the opening K of the proportional control valve is adjusted to K0, after T0 time, the relation between the delta T and the first set temperature T1 and the relation between the delta T and the second set temperature T2 are judged again, and the opening of the proportional control valve is adjusted correspondingly.
The air heat source pump comprises a water pump, an expansion water tank, a user tail end, an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compressor, a four-way valve, an outdoor heat exchanger and a throttle valve, the indoor unit comprises an indoor heat exchanger, a proportion adjusting valve is further arranged between a water outlet of the indoor unit and the expansion water tank, a temperature sensing bulb is arranged at the user tail end, and the proportion adjusting valve is adjusted by adopting the temperature control method.
According to the invention, the proportional control valve is additionally arranged between the water outlet of the unit and the return water expansion water tank, the proportional control valve can control the opening of the valve, and when the indoor actual temperature exceeds the indoor set temperature, the opening of the proportional control valve is increased and is in a linear relation with the difference value between the indoor actual temperature and the indoor set temperature. After the proportion regulating valve is added, part of heat does not directly enter the expansion water tank for heat storage through the tail end of a user, the redundant heat waste of the part is prevented, the fluctuation of the indoor environment temperature is also slowed down, and the comfort of the user is improved.
Fig. 1 is a specific embodiment of an air source heat pump water cooling and heating unit system, which includes a variable frequency compressor 5, a four-way valve 4, an outdoor heat exchanger 6, an electronic expansion valve 7, an indoor heat exchanger 3, a water pump 8, an expansion water tank 2, a proportional control valve 1, a user terminal, and an indoor thermal bulb 9; a pipeline between the expansion water tank 2 and the indoor heat exchanger 3 is provided with a water inlet temperature sensing bulb 10, and a pipeline between the indoor heat exchanger 3 and the water pump 8 is provided with a water outlet temperature sensing bulb 11.
In the heating mode, the compressor compresses refrigerant into high-temperature and high-pressure gas, the gas enters the indoor heat exchanger through the four-way valve to be condensed, the refrigerant transfers heat to secondary refrigerant, namely water, the high-pressure liquid coming out of the indoor heat exchanger enters the electronic expansion valve to be reduced in pressure to be changed into low-pressure liquid, the low-pressure liquid passes through the outdoor heat exchanger to exchange heat with the external environment, and the low-temperature and low-pressure gas is changed into low-. The secondary refrigerant, namely water, is divided into two flow paths from the indoor heat exchanger to the water pump, one flow path enters the tail end of a user to release heat, the other flow path directly enters the expansion water tank through the proportion regulating valve, and finally flows back to the indoor heat exchanger to exchange heat.
The indoor temperature sensing bulb mainly detects the indoor actual temperature, is marked as T02, and generally needs to be installed at a place which is 1.2m away from the ground, has good air circulation and is not directly irradiated by sunlight. The target temperature set by the user on the hand operator is T01.
The temperature control method based on the proportional control valve in the embodiment mainly comprises three parts:
in the first part, when the difference (the symbol is delta T) between the indoor temperature sensing bulb temperature T02 and the indoor set temperature T01 of the hand operator is less than a first preset value T1, namely:
△T＝T02-T01＜T1；
at the moment, the heat load provided by the unit is determined to be insufficient to meet the requirement of a user, the opening of the proportional control valve is 0, and the first preset value T1 is generally 0 ℃;
and a second part, when the difference delta T between the indoor temperature sensing bulb temperature T02 and the indoor set temperature T01 of the hand operator is between a first preset value and a second preset value, namely:
T1≤△T＝T02-T01≤T2；
at this time, the thermal load provided by the unit is determined to just meet or exceed the user requirement, and the opening degree of the proportional control valve and the delta T are in a linear relation, namely:
K＝(a△T)％K0；
a is a proportionality coefficient, generally set to be in the range of 20-30, and set to be 25 in the text;
k0 is the opening degree of the proportional control valve when the proportional control valve is fully opened;
the second preset value is 4 ℃ in the text, and the general range is 2-5 ℃;
and in the third part, when the difference delta T between the indoor temperature sensing bulb temperature T02 and the indoor set temperature T01 of the hand operator is greater than a second preset value, the following steps are carried out:
△T＝T02-T01＞T2；
at this time, the heat load provided by the unit is determined to be far beyond the requirement of a user, and the proportional control valve is fully opened. In such a situation, the unit is usually shut down, and when the indoor temperature is lower than a set value, the unit is started up again to operate.
Fig. 2 is a control strategy diagram, and the specific implementation method is as follows:
step 1: setting the initial opening degree of the proportional control valve after starting up to be 0, and acquiring indoor set temperature T01 and temperature T02 detected by an indoor temperature sensing bulb;
step 2: after T0 time, calculating the delta T as T02-T01, wherein T0 is 40-60 s;
step 3, judging that delta T is less than T1?, if so, adjusting the opening K of the proportional control valve to 0, and then entering step 2, otherwise, entering step 4;
step 4, judging that the T1 is more than or equal to the Delta T is more than or equal to the T2?, and if so, adjusting the opening K of the proportional control valve as follows:
K＝(a△T)％K0；
then entering step 2; if not, the opening of the proportional control valve is adjusted to K0, and then the step 2 is carried out.
In a refrigeration mode, a compressor compresses a refrigerant into high-temperature and high-pressure gas, the gas enters an outdoor heat exchanger through a four-way valve, exchanges heat with the external environment and is condensed into high-pressure liquid, the high-pressure liquid enters an electronic expansion valve and is throttled into low-pressure liquid, the low-pressure liquid enters an indoor heat exchanger, and the refrigerant absorbs the heat of a secondary refrigerant and becomes low-temperature and low-pressure gas to return to the compressor. The water-side flow path is the same as the heating mode.
In the cooling mode, the control method of the proportional control valve is similar to that in the heating mode, and in the control logic, the delta T is T01-T02.
Fig. 3 is a graph showing a change in the opening degree of the proportional control valve, and it can be seen that the opening degree of the proportional control valve is linearly related to the difference between the indoor temperature sensing bulb temperature and the set target temperature. In actual engineering, the change trend of the proportional control valve can be matched through a large amount of experimental data and the operation condition of a unit, the change trend is not necessarily in a linear relation, and only one idea is provided for reference.
In summary, the proportion regulating valve device is added between the water outlet of the unit and the return water expansion tank, the proportion regulating valve can control the opening of the valve, and when the indoor actual temperature exceeds the indoor set temperature, the opening of the proportion regulating valve is increased and is in a linear relation with the difference value between the indoor actual temperature and the indoor set temperature. Energy waste is avoided, and user comfort is improved. The opening degree of the proportional control valve is adjusted by judging the difference value between the actual room temperature and the temperature set by the user, and the opening degree of the proportional control valve can be controlled by judging the difference value between the actual outlet water temperature and the set outlet water temperature.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The temperature control method based on the proportional control valve is characterized by comprising the following steps:
setting the opening K of the proportional control valve at the initial time to be 0, and acquiring an environment set temperature T01 and an environment actual measurement temperature T02;
after the time T0, calculating the difference DeltaT between the environmental set temperature T01 and the environmental measured temperature T02,
in the heating mode: T02-T01;
in a refrigeration mode: T01-T02;
judging the relation between the delta T and the first set temperature T1, if the delta T is less than T1, keeping the opening K of the proportional regulating valve at 0, and after T0, judging the relation between the delta T and the first set temperature T1 again and correspondingly regulating the opening of the proportional regulating valve;
if the delta T is not less than T1, judging the relation between the delta T and a second set temperature T2, and if the T1 is not less than T2, adjusting the opening K of the proportional control valve according to the following method:
K＝(a△T)％K0；
wherein a is a proportionality coefficient; k0 is the opening degree of the proportional control valve when the proportional control valve is fully opened;
after T0 time, re-judging the relationship between the delta T and the first set temperature T1 and the second set temperature T2 and correspondingly adjusting the opening degree of the proportional control valve;
if the delta T is larger than T2, the opening K of the proportional control valve is adjusted to K0, after T0 time, the relation between the delta T and the first set temperature T1 and the relation between the delta T and the second set temperature T2 are judged again, and the opening of the proportional control valve is adjusted correspondingly.
2. The temperature control method based on the proportional regulating valve of claim 1, wherein the value of t0 ranges from 40s to 60 s.
3. The proportional regulating valve-based temperature control method according to claim 1, wherein the first set temperature T1 is 0 ℃; the value range of the second set temperature T2 is 2-5 ℃.
4. The proportional regulating valve based temperature control method of claim 1, wherein the ambient set temperature T01 is a user set temperature, the ambient measured temperature T02 is an actual room temperature; or the environment set temperature T01 is a set outlet water temperature, and the environment measured temperature T02 is an actual outlet water temperature.
5. The temperature control method based on the proportional control valve as claimed in claim 1, wherein the value range of the proportional coefficient a is 20-30.
6. An air heat source pump comprises a water pump, an expansion water tank, a user end, an outdoor unit and an indoor unit, wherein the outdoor unit comprises a compressor, a four-way valve, an outdoor heat exchanger and a throttle valve, the indoor unit comprises an indoor heat exchanger, and the air heat source pump is characterized in that a proportional control valve is further arranged between a water outlet of the indoor unit and the expansion water tank, a temperature sensing bulb is arranged at the user end, and the proportional control valve is adjusted by the temperature control method according to any one of claims 1 to 5.
7. An air heat source pump as defined in claim 6 wherein the bulb is mounted at a height of 1.2m from ground.
8. An air heat source pump as claimed in claim 6, wherein the user sets the ambient set temperature T01 by hand operator.
9. An air heat source pump according to claim 6, wherein a water inlet temperature sensing bulb is provided at a water inlet end of the indoor heat exchanger, and a water outlet temperature sensing bulb is provided at a water outlet end of the indoor heat exchanger.
10. An air heat source pump according to claim 6, wherein in the heating mode, the compressor compresses the refrigerant into high-temperature and high-pressure gas, the gas enters the indoor heat exchanger through the four-way valve to be condensed, the refrigerant transfers heat to the secondary refrigerant, the high-pressure liquid from the indoor heat exchanger enters the throttling valve to be reduced in pressure to be changed into low-pressure liquid, the low-pressure liquid passes through the outdoor heat exchanger to exchange heat with the external environment, and the low-temperature and low-pressure gas is changed to return to the compressor; the secondary refrigerant is divided into two paths from the indoor heat exchanger to the water pump, one path enters the tail end of a user to release heat, the other path directly enters the expansion water tank through the proportion regulating valve, and finally flows back to the indoor heat exchanger to exchange heat.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811178174.1A CN109282522B (en) | 2018-10-10 | 2018-10-10 | Temperature control method based on proportional control valve and air heat source pump with same |
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| CN201811178174.1A CN109282522B (en) | 2018-10-10 | 2018-10-10 | Temperature control method based on proportional control valve and air heat source pump with same |
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| CN109282522B true CN109282522B (en) | 2019-12-24 |
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| CN114442696B (en) * | 2022-01-24 | 2023-05-05 | 成都市绿色快线环保科技有限公司 | Temperature control system and method |
| CN115490345B (en) * | 2022-06-30 | 2023-08-18 | 青岛海尔施特劳斯水设备有限公司 | Control method for water purifier and water purifier |
| CN115059983A (en) * | 2022-08-15 | 2022-09-16 | 新誉集团有限公司 | Air supply control method, system, equipment and computer readable storage medium |
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| JPWO2015114839A1 (en) * | 2014-02-03 | 2017-03-23 | 三菱電機株式会社 | Cooling device and heat source machine |
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| CN201392048Y (en) * | 2008-12-05 | 2010-01-27 | 沃姆制冷设备(上海)有限公司 | Air supplement enthalpy-increasing device of air source heat pump unit and system control device thereof |
| CN103557652A (en) * | 2013-10-29 | 2014-02-05 | 北京合创三众能源科技股份有限公司 | Ground source heat pump integrated controller |
| JP2016217661A (en) * | 2015-05-25 | 2016-12-22 | 甲信食糧株式会社 | Air conditioning method and air conditioning system for low temperature warehouse cargo handling chamber |
| CN107228439A (en) * | 2017-06-29 | 2017-10-03 | 广东美的暖通设备有限公司 | Multiple on-line system and its control method |
| CN107238226A (en) * | 2017-06-29 | 2017-10-10 | 广东美的暖通设备有限公司 | Multiple on-line system and its control method |
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