CN105222293A - Coiled pipe frost crack prevention system and method for double-heat-source air conditioner - Google Patents
Coiled pipe frost crack prevention system and method for double-heat-source air conditioner Download PDFInfo
- Publication number
- CN105222293A CN105222293A CN201510706184.8A CN201510706184A CN105222293A CN 105222293 A CN105222293 A CN 105222293A CN 201510706184 A CN201510706184 A CN 201510706184A CN 105222293 A CN105222293 A CN 105222293A
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- water
- coil pipe
- air conditioner
- heat source
- cracking
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Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000002265 prevention Effects 0.000 title 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 137
- 238000004378 air conditioning Methods 0.000 claims abstract description 39
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 238000009423 ventilation Methods 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 230000000740 bleeding effect Effects 0.000 claims description 5
- 238000005057 refrigeration Methods 0.000 claims description 5
- 238000007710 freezing Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 230000008014 freezing Effects 0.000 description 5
- 239000002826 coolant Substances 0.000 description 4
- 230000009172 bursting Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000002528 anti-freeze Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/52—Weather protecting means, e.g. against wind, rain or snow
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Atmospheric Sciences (AREA)
- Air Conditioning Control Device (AREA)
- Steam Or Hot-Water Central Heating Systems (AREA)
Abstract
The invention provides a coil pipe anti-freezing system for a double-heat-source air conditioner, which comprises an air conditioner coil pipe, a water inlet pipeline, a water outlet pipeline and also comprises: a drain leg disposed adjacent to an inlet of the air conditioning coil; a vent branch disposed adjacent an outlet of the air conditioning coil; the temperature sensing device for water inlet is arranged on a water inlet pipeline adjacent to the inlet of the air-conditioning coil; the water outlet temperature sensing device is arranged on the ventilation branch; and the controller is used for controlling water inlet, water outlet, water drainage and air exhaust according to the user indication and the temperatures measured by the water inlet temperature sensing device and the water outlet temperature sensing device. According to the system and the method for preventing the frost crack of the coil pipe of the double-heat-source air conditioner and the double-heat-source air conditioner, the water in the fan coil pipe is discharged in time by adding the water discharging branch, the water discharging valve, the air discharging branch and the air valve, so that the frost crack of the coil pipe is effectively prevented. Meanwhile, when the heating mode is operated, the water in the coil pipe cannot be heated for the second time, and the energy-saving effect can be achieved.
Description
Technical field
The present invention relates to a kind of coil pipe frost-cracking-preventing system for two heat source air conditioner, method and two heat source air conditioner, belong to air conditioner technical field.
Background technology
The heat exchanger of two heat source air conditioner indoor set generally includes independently water system and coolant system.When freezing, coolant system runs, but when heating, has three kinds to heat mode: coolant system heats, water system heats, coolant system and water system heat jointly.Fan coil uses usually in water system, its operation principle is the air constantly recycling room, place in unit, make air by cooled (heating) after cold water (hot water) coil pipe, namely adopt the cold or thermal source of outer confession can to room supplying cold directly or heat supply, to keep the constant of room temperature.Fan coil mainly by relying on the positive action of blower fan, is got a desired effect by the effect of surface cooler.Fan coil and air-conditioner set are arranged in pairs or groups and are used, and can be used for the hot-water heating system of northern area, reduce heating equipment investment.
Add antifreeze medium in the thermal source of the existing anti-frost-cracking technology to air-conditioning coil pipe mainly confession outside, reduce the freezing point of heating hot water.But under the situation that weather is severe especially, antifreeze medium is not fully effective, and fan coil still can by bursting by freezing.
Summary of the invention
The object of this invention is to provide a kind of coil pipe frost-cracking-preventing system for two heat source air conditioner, method and two heat source air conditioner, the problem that solution fan coil bursting by freezing and post bake waste energy.
Object of the present invention carrys out specific implementation by the following technical programs:
One aspect of the present invention provides a kind of coil pipe frost-cracking-preventing system for two heat source air conditioner, comprises air-conditioning coil pipe, inlet pipeline, outlet pipeline, it is characterized in that, also comprise,
Draining branch road, it is arranged on the porch being adjacent to described air-conditioning coil pipe;
Ventilation branch road, it is arranged on the exit being adjacent to described air-conditioning coil pipe;
Water inlet temperature sensing device, it is arranged on the inlet pipeline of the entrance being adjacent to described air-conditioning coil pipe;
Water outlet temperature sensing device, it is arranged on described ventilation branch road;
Controller, its for record according to user's instruction and described water inlet temperature sensing device and water outlet temperature sensing device temperature control water inlet, water outlet, draining and exhaust.
Preferably, described inlet pipeline is provided with water intaking valve, described outlet pipeline is provided with outlet valve, described draining branch road is provided with draining valve, described ventilation branch road is provided with air valve, wherein, described controller controls water inlet, water outlet, draining and exhaust by controlling described water intaking valve, outlet valve, draining valve and air bleeding valve.
Preferably, described draining branch road is arranged between the entrance of described water intaking valve and described air-conditioning coil pipe.
Preferably, described ventilation branch road is arranged between the outlet of described outlet valve and described air-conditioning coil pipe.
Preferably, described water intaking valve, outlet valve, draining valve and/or air bleeding valve are magnetic valve.
The present invention provides a kind of coil pipe frost-cracking-preventing method for two heat source air conditioner on the other hand, use as above for the coil pipe frost-cracking-preventing system of two heat source air conditioner, wherein, controller controls the opening and closing of inlet pipeline, outlet pipeline, draining branch road and ventilation branch road according to the operational mode of air-conditioning, to discharge the water in air-conditioning coil pipe when not using heating function.
Preferably, when air-conditioning is in heating mode, described controller performs following steps:
Step 1: close draining branch road, opens into water branch road, water outlet branch road and ventilation branch road;
Step 2: water inlet temperature sensing device detects the water temperature T of inlet pipeline
enter, water outlet temperature sensing device detects the water temperature T of water lines
go out;
Step 3: compare T
enterand T
go out;
Step 4: work as T
enterand T
go outbetween difference when being less than predetermined threshold, close gas check valve;
Preferably, when controller receives drain signal, described controller performs following steps:
Step 102: close water inlet branch road and water outlet branch road, opens draining branch road and ventilation branch road;
Step 103: water inlet temperature sensing device detects the water temperature T of inlet pipeline
enter, water outlet temperature sensing device detects the water temperature T of water lines
go out;
Step 104: compare T
enter, T
go outwith environment temperature T
ring;
Step 105: if T
enter=T
go out=T
environment, judge that the water in described air-conditioning coil pipe is drained, close draining valve and air valve.
Preferably, when refrigeration mode operation is shut down or be in air-conditioning internal machine, controller performs following steps:
Step 201: water inlet temperature sensing device detects the water temperature T of inlet pipeline
enter, water outlet temperature sensing device detects the water temperature T of water lines
go out;
Step 202: compare T
enterand T
go out;
Step 203: work as T
enter≤ and T
go outduring≤predetermined threshold, send drain signal, control the water of automatically discharging for the coil pipe frost-cracking-preventing system of two heat source air conditioner in coil pipe.
Preferably, when sending drain signal, the described coil pipe frost-cracking-preventing system for two heat source air conditioner performs step 102 as above, step 103, step 104 and step 105.
Preferably, described predetermined threshold is not more than 2 DEG C.
Preferably, described drain signal is manually inputted by user and/or automatically sets input by the described coil pipe frost-cracking-preventing system for two heat source air conditioner.
The present invention provides a kind of two heat source air conditioner on the other hand, and it comprises as above for the coil pipe frost-cracking-preventing system of two heat source air conditioner.
Coil pipe frost-cracking-preventing system for two heat source air conditioner of the present invention, method and two heat source air conditioner, achieved the water of discharging in time in fan coil by increase draining branch road and draining valve, exhaust branch road and air valve, thus effectively prevent the object of coil frost broken.Meanwhile, when not using hot-water heating system to heat, can guarantee not store large water gaging in coil pipe, when running heating mode, refrigerant heats and only participates in room air adjustment, to the water post bake in coil pipe, can not can reach energy-saving effect.
Accompanying drawing explanation
According to drawings and embodiments the present invention is described in further detail below.
Fig. 1 is the schematic diagram of the coil pipe frost-cracking-preventing system for two heat source air conditioner described in the embodiment of the present invention.
Fig. 2 is the flow chart of the coil pipe frost-cracking-preventing method for two heat source air conditioner described in the present invention first embodiment of the method.
Fig. 3 is the flow chart of the coil pipe frost-cracking-preventing method for two heat source air conditioner described in the present invention second embodiment of the method.
Fig. 4 is the flow chart of the coil pipe frost-cracking-preventing method for two heat source air conditioner described in third method embodiment of the present invention.
Detailed description of the invention
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Below with reference to accompanying drawing, embodiments of the present invention is described in detail respectively.
First the embodiment of the present invention provides a kind of coil pipe frost-cracking-preventing system for two heat source air conditioner, comprises air-conditioning coil pipe 1, inlet pipeline 2, outlet pipeline 3, also comprises:,
Draining branch road 4, it is arranged on entrance 11 place being adjacent to described air-conditioning coil pipe 1;
Ventilation branch road 5, it is arranged on outlet 12 place being adjacent to described air-conditioning coil pipe 1;
Water inlet temperature sensing device 6 and water outlet temperature sensing device 7, it is separately positioned on the entrance 11 and outlet 12 places that are adjacent to described air-conditioning coil pipe, particularly, water inlet temperature sensing device 6 is arranged on inlet pipeline 2, and water outlet temperature sensing device 7 is arranged on outlet pipeline 3 or ventilates on branch road 5;
Controller (not shown), its for record according to user's instruction and described water inlet temperature sensing device 6 and water outlet temperature sensing device 7 temperature control water inlet, water outlet, draining and exhaust.
In a further preferred embodiment, described inlet pipeline 2 is provided with water intaking valve 201, outlet pipeline 3 is provided with outlet valve 301, draining branch road 4 is provided with draining valve 401, ventilation branch road 5 is provided with air valve 501, wherein, controller (not shown) controls water inlet, water outlet, draining and exhaust by controlling water intaking valve 201, outlet valve 301, draining valve 401 and air valve 501.
Preferably, draining branch road 4 is arranged between the entrance 11 of water intaking valve 201 and air-conditioning coil pipe.
Preferably, branch road 5 of ventilating is arranged between the outlet 12 of outlet valve 301 and air-conditioning coil pipe.
Preferably, water intaking valve, outlet valve, draining valve and/or air bleeding valve are magnetic valve.
Embodiment of the method for the present invention uses as above for the coil pipe frost-cracking-preventing system of two heat source air conditioner, wherein, controller controls the opening and closing of inlet pipeline, outlet pipeline, draining branch road and ventilation branch road according to the operational mode of air-conditioning, to discharge the water in air-conditioning coil pipe when not using heating function.The preferred embodiment of described method, respectively with reference to shown in figure 2,3,4, is specifically described below:
Embodiment of the method one
As shown in Figure 2, a kind of coil pipe frost-cracking-preventing method for two heat source air conditioner, when air-conditioning is in heating mode, controller performs following steps:
Step 1: close draining valve, open water intaking valve, outlet valve and air valve;
Step 2: water inlet temperature sensing device detects the water temperature T of inlet pipeline
enter, water outlet temperature sensing device detects the water temperature T of water lines
go out;
Step 3: compare T
enterand T
go out;
Step 4: work as T
enterand T
go outbetween difference when being less than predetermined threshold, after preferably continuing for some time, close gas check valve.
Preferably, predetermined threshold is not more than 2 DEG C, particularly, can be 2 DEG C.
Embodiment of the method two
As shown in Figure 3, a kind of coil pipe frost-cracking-preventing method for two heat source air conditioner, when controller receives drain signal, described controller performs following steps:
Step 102: close water intaking valve and outlet valve, open draining valve and air valve;
Step 103: water inlet temperature sensing device detects the water temperature T of inlet pipeline
enter, water outlet temperature sensing device detects the water temperature T of water lines
go out;
Step 104: compare T
enter, T
go outwith environment temperature T
ring;
Step 105: if T
enter=T
go out=T
ring, after preferably continuing for some time, judge that the water in described air-conditioning coil pipe is drained, close draining valve and air valve.
Preferably, described drain signal is manually inputted by user or automatically sets input by the described coil pipe frost-cracking-preventing system for two heat source air conditioner.
Embodiment of the method three
As shown in Figure 4, a kind of coil pipe frost-cracking-preventing method for two heat source air conditioner, when air-conditioning internal machine is shut down or refrigeration mode runs, controller performs following steps:
Step 201: water inlet temperature sensing device detects the water temperature T of inlet pipeline
enter, water outlet temperature sensing device detects the water temperature T of water lines
go out;
Step 202: compare T
enterand T
go out;
Step 203: work as T
enter≤ and T
go outduring≤predetermined threshold, after preferably continuing for some time, send drain signal, control the water of automatically discharging for the coil pipe frost-cracking-preventing system of two heat source air conditioner in coil pipe.
Preferably, predetermined threshold is not more than 2 DEG C, particularly, can be 2 DEG C.
Further, when controller sends drain signal, the above-mentioned coil pipe frost-cracking-preventing system for two heat source air conditioner performs the step as described in embodiment of the method two, namely performs step 102, step 103, step 104 and step 105.
The embodiment of the present invention also provides a kind of two heat source air conditioner, comprises the coil pipe frost-cracking-preventing system for two heat source air conditioner performing any one method as above.
Those skilled in the art are by reading above-mentioned explanation and can understanding with reference to accompanying drawing, basic ideas of the present invention are bypass discharge pipe lines after the water inlet water valve of coil pipe of air-conditioner blower and between coil pipe water inlet, this pipeline installs draining valve, increased by the ventilation branch road of Air Valve Control before outlet valve simultaneously, and set out water temperature sensing device on this branch road, thus automatically carry out draining by controller as required.
Below appearance during several situation, the bypass drain function that can be provided by the system and method described in the embodiment of the present invention prevents coil frost broken:
(1) heating season, the operation of air conditioner refrigeration mode in some room may be there is, and other rooms run the situation of heating mode, the system provided by the embodiment of the present invention can discharge separately the water in the air-conditioning coil pipe in the room at the air-conditioning place allowing refrigeration mode, does not affect the heating of the two heat source air conditioner in other rooms;
(2), after hot-water heating system supply time terminates, the water in fan coil can be discharged by the system and method described in the embodiment of the present invention in time, prevent bursting by freezing; Meanwhile, when interior machine runs heating mode, avoid the post bake to the water in coil pipe, reach energy-conservation effect;
(3) room being provided with two heat source air conditioner runs a period of time heating, and when then stopping using for a long time, the water stored in coil pipe can be discharged in time, pre-frost-cracking-preventing coil pipe.
Technology contents of the present invention and technical characteristic have disclosed as above; but those of ordinary skill in the art still may do all replacement and the modification that do not deviate from spirit of the present invention based on teaching of the present invention and announcement; therefore; scope should be not limited to the content that embodiment discloses; and various do not deviate from replacement of the present invention and modification should be comprised, and contained by the claims in the present invention.
Claims (13)
1., for a coil pipe frost-cracking-preventing system for two heat source air conditioner, comprise air-conditioning coil pipe, inlet pipeline, outlet pipeline, it is characterized in that, also comprise,
Draining branch road, it is arranged on the porch being adjacent to described air-conditioning coil pipe;
Ventilation branch road, it is arranged on the exit being adjacent to described air-conditioning coil pipe;
Water inlet temperature sensing device, it is arranged on the inlet pipeline of the entrance being adjacent to described air-conditioning coil pipe;
Water outlet temperature sensing device, it is arranged on described ventilation branch road;
Controller, its for record according to user's instruction and described water inlet temperature sensing device and water outlet temperature sensing device temperature control water inlet, water outlet, draining and exhaust.
2. as claimed in claim 1 for the coil pipe frost-cracking-preventing system of two heat source air conditioner, it is characterized in that, described inlet pipeline is provided with water intaking valve, described outlet pipeline is provided with outlet valve, described draining branch road is provided with draining valve, described ventilation branch road is provided with air valve, and wherein, described controller controls water inlet, water outlet, draining and exhaust by controlling described water intaking valve, outlet valve, draining valve and air bleeding valve.
3., as claimed in claim 2 for the coil pipe frost-cracking-preventing system of two heat source air conditioner, it is characterized in that, described draining branch road is arranged between the entrance of described water intaking valve and described air-conditioning coil pipe.
4., as claimed in claim 2 for the coil pipe frost-cracking-preventing system of two heat source air conditioner, it is characterized in that, described ventilation branch road is arranged between the outlet of described outlet valve and described air-conditioning coil pipe.
5. the coil pipe frost-cracking-preventing system for two heat source air conditioner according to any one of claim 2-4, it is characterized in that, described water intaking valve, outlet valve, draining valve and/or air bleeding valve are magnetic valve.
6. the coil pipe frost-cracking-preventing method for two heat source air conditioner, it is characterized in that, use the coil pipe frost-cracking-preventing system for two heat source air conditioner according to any one of claim 1-5, wherein, controller controls the opening and closing of inlet pipeline, outlet pipeline, draining branch road and ventilation branch road according to the operational mode of air-conditioning, to discharge the water in air-conditioning coil pipe when not using heating function.
7. as claimed in claim 6 for the coil pipe frost-cracking-preventing method of two heat source air conditioner, it is characterized in that, when air-conditioning is in heating mode, described controller performs following steps:
Step 1: close draining branch road, opens into water branch road, water outlet branch road and ventilation branch road;
Step 2: water inlet temperature sensing device detects the water temperature T of inlet pipeline
enter, water outlet temperature sensing device detects the water temperature T of water lines
go out;
Step 3: compare T
enterand T
go out;
Step 4: work as T
enterand T
go outbetween difference when being less than predetermined threshold, close gas check valve.
8. as claimed in claim 6 for the coil pipe frost-cracking-preventing method of two heat source air conditioner, it is characterized in that, when controller receives drain signal, described controller performs following steps:
Step 102: close water inlet branch road and water outlet branch road, opens draining branch road and ventilation branch road;
Step 103: water inlet temperature sensing device detects the water temperature T of inlet pipeline
enter, water outlet temperature sensing device detects the water temperature T of water lines
go out;
Step 104: compare T
enter, T
go outwith environment temperature T
ring;
Step 105: if T
enter=T
go out=T
environment, judge that the water in described air-conditioning coil pipe is drained, close draining valve and air valve.
9. as claimed in claim 6 for the coil pipe frost-cracking-preventing method of two heat source air conditioner, it is characterized in that, when refrigeration mode operation is shut down or be in air-conditioning internal machine, controller performs following steps:
Step 201: water inlet temperature sensing device detects the water temperature T of inlet pipeline
enter, water outlet temperature sensing device detects the water temperature T of water lines
go out;
Step 202: compare T
enterand T
go out;
Step 203: work as T
enter≤ and T
go outduring≤predetermined threshold, send drain signal, control the water of automatically discharging for the coil pipe frost-cracking-preventing system of two heat source air conditioner in coil pipe.
10. as claimed in claim 9 for the coil pipe frost-cracking-preventing method of two heat source air conditioner, it is characterized in that, when sending drain signal, the described coil pipe frost-cracking-preventing system for two heat source air conditioner performs step 102 as described in claim 8, step 103, step 104 and step 105.
11. coil pipe frost-cracking-preventing methods for two heat source air conditioner according to any one of claim 7-10, it is characterized in that, described predetermined threshold is not more than 2 DEG C.
12. coil pipe frost-cracking-preventing methods for two heat source air conditioner according to any one of claim 7-10, it is characterized in that, described drain signal is manually inputted by user and/or automatically sets input by the described coil pipe frost-cracking-preventing system for two heat source air conditioner.
13. 1 kinds of two heat source air conditioners, is characterized in that, comprise the coil pipe frost-cracking-preventing system for two heat source air conditioner according to any one of claim 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510706184.8A CN105222293B (en) | 2015-10-26 | 2015-10-26 | Coiled pipe frost crack prevention system and method for double-heat-source air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510706184.8A CN105222293B (en) | 2015-10-26 | 2015-10-26 | Coiled pipe frost crack prevention system and method for double-heat-source air conditioner |
Publications (2)
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|---|---|
| CN105222293A true CN105222293A (en) | 2016-01-06 |
| CN105222293B CN105222293B (en) | 2018-02-06 |
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| CN106123244A (en) * | 2016-08-08 | 2016-11-16 | 珠海格力电器股份有限公司 | Drainage control method and device of air conditioning system |
| CN106482323A (en) * | 2016-12-09 | 2017-03-08 | 广东高而美制冷设备有限公司 | A kind of double-tube heat exchanger and air-conditioning |
| CN107559927A (en) * | 2017-09-29 | 2018-01-09 | 珠海格力电器股份有限公司 | Water unit anti-freezing system and method |
| CN108317727A (en) * | 2018-02-05 | 2018-07-24 | 广东美的暖通设备有限公司 | The antifreeze control method of water heater and its water circuit system, controller and storage medium |
| CN109237726A (en) * | 2018-08-27 | 2019-01-18 | 珠海格力电器股份有限公司 | Anti-freezing protector for pipeline and air conditioning unit adopting anti-freezing protector |
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| CN106123244B (en) * | 2016-08-08 | 2018-11-30 | 珠海格力电器股份有限公司 | drainage control method and device of air conditioning system |
| CN106482323A (en) * | 2016-12-09 | 2017-03-08 | 广东高而美制冷设备有限公司 | A kind of double-tube heat exchanger and air-conditioning |
| CN107559927A (en) * | 2017-09-29 | 2018-01-09 | 珠海格力电器股份有限公司 | Water unit anti-freezing system and method |
| CN108317727A (en) * | 2018-02-05 | 2018-07-24 | 广东美的暖通设备有限公司 | The antifreeze control method of water heater and its water circuit system, controller and storage medium |
| CN108317727B (en) * | 2018-02-05 | 2020-08-25 | 广东美的暖通设备有限公司 | Water heater and anti-freezing control method, controller and storage medium of water path system of water heater |
| CN109237726A (en) * | 2018-08-27 | 2019-01-18 | 珠海格力电器股份有限公司 | Anti-freezing protector for pipeline and air conditioning unit adopting anti-freezing protector |
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