CN109595856B - Heat recovery system and defrosting control method - Google Patents
Heat recovery system and defrosting control method Download PDFInfo
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- CN109595856B CN109595856B CN201811341656.4A CN201811341656A CN109595856B CN 109595856 B CN109595856 B CN 109595856B CN 201811341656 A CN201811341656 A CN 201811341656A CN 109595856 B CN109595856 B CN 109595856B
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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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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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
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
- F25B15/02—Sorption machines, plants or systems, operating continuously, e.g. absorption type without inert gas
- F25B15/025—Liquid transfer means
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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
- F25B2347/00—Details for preventing or removing deposits or corrosion
- F25B2347/02—Details of defrosting cycles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
Abstract
The invention discloses a heat recovery system and a defrosting control method, which comprise the following steps: the first liquid pipe, the first air pipe and the generator comprise a second pipeline, the first liquid pipe is connected with a first refrigerant flow path and a second refrigerant flow path, the first refrigerant flow path is communicated with the first liquid pipe and the second pipeline through a first valve component, and the second refrigerant flow path is communicated with the first liquid pipe and the first air pipe through a second valve component. Therefore, a proper defrosting mode can be selected, the risk that the pipeline in the unit is frozen due to a low-temperature refrigerant in the defrosting process is reduced, the unit is protected, and the service performance of the unit is improved.
Description
Technical Field
The invention relates to the field of units, in particular to a heat recovery system and a defrosting control method.
Background
At present, a hot water generator is based on the principle that hot water or cold water is produced by heat exchange between a refrigerant and water. When the system defrosts, the temperature of a refrigerant pipe of the hot water generator is probably lower than zero, so that a system pipeline is frozen, and finally, the pipeline is broken to cause water inflow of the system and damage a unit. In order to solve the problem, the defrosting can be controlled by detecting the water temperature, when the water temperature is not in the risk of icing, the defrosting is carried out again, but when the water temperature is too low and the unit needs to be defrosted, the defrosting cannot be met.
Aiming at the problem that pipelines are easy to damage when defrosting is carried out when the water inlet temperature of a generator is too low in the related art, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a heat recovery system and a defrosting control method. The problem that pipelines are easy to damage when defrosting is carried out when the water inlet temperature of the generator is too low in the related technology can be solved.
In a first aspect, an embodiment of the present invention provides a heat recovery system, including: a first liquid pipe, a first air pipe and a generator, wherein the generator comprises a second pipeline,
the first liquid pipe is connected with a first refrigerant flow path and a second refrigerant flow path, the first refrigerant flow path communicates the first liquid pipe and the second pipeline with the first air pipe through a first valve assembly, and the second refrigerant flow path communicates the first liquid pipe with the first air pipe through a second valve assembly.
Further, the first valve assembly includes: and the first electronic expansion valve is arranged on the second pipeline and is positioned on the refrigerant outlet side of the generator.
Further, the first valve assembly further comprises: and the refrigeration electromagnetic valve is arranged between the second pipeline and the first air pipe.
Further, the second valve assembly includes: and the supercooling electromagnetic valve is arranged between the first liquid pipe and the first gas pipe.
Further, the system further comprises: a third air pipe, a heating electromagnetic valve,
and the heating electromagnetic valve is arranged between the third air pipe and the second pipeline.
Further, the system further comprises: and the electric heating device is arranged on the water inlet pipeline of the generator.
In a second aspect, an embodiment of the present invention provides a defrosting control method, which is applied to the system in the first aspect, and the method includes:
detecting the water inlet temperature of the system;
and determining that the refrigerant flow path of the system is a first refrigerant flow path or a second refrigerant flow path according to the inlet water temperature.
Further, determining whether the refrigerant flow path of the system is a first refrigerant flow path or a second refrigerant flow path according to the inlet water temperature includes:
judging whether the water inlet temperature is greater than a first preset threshold value or not;
when the inlet water temperature is greater than a first preset threshold value, determining a refrigerant flow path of the system as a first refrigerant flow path;
and when the inlet water temperature is less than or equal to a first preset threshold value, determining that the refrigerant flow path of the system is a second refrigerant flow path.
Further, when the inlet water temperature is greater than a first preset threshold, determining that the refrigerant flow path of the system is a first refrigerant flow path includes:
controlling the first valve component to be opened, the heating electromagnetic valve to be closed and the second valve component to be closed;
wherein the first valve assembly comprises: the first electronic expansion valve is arranged on the second pipeline and is positioned on the refrigerant outlet side of the generator, and the refrigeration electromagnetic valve is arranged between the second pipeline and the first air pipe;
the second valve assembly includes: a subcooling solenoid valve disposed between the first liquid pipe and the first gas pipe,
the system also comprises a third air pipe, and the heating electromagnetic valve is arranged between the third air pipe and the second pipeline.
Further, when the inlet water temperature is less than or equal to a first preset threshold, determining that the refrigerant flow path of the system is a second refrigerant flow path includes:
controlling the refrigeration electromagnetic valve to be closed and the second valve component to be opened;
wherein the refrigeration solenoid valve is disposed between the second pipeline and the first air pipe, and the second valve assembly includes: a subcooling solenoid valve disposed between the first liquid line and the first gas line.
Further, when the inlet water temperature is less than or equal to a first preset threshold, determining that the refrigerant flow path of the system is a second refrigerant flow path, including:
when the inlet water temperature is less than or equal to a first preset threshold value, further judging whether the inlet water temperature is less than a second preset threshold value;
and if not, determining that the refrigerant flow path of the system is the refrigerant flow path determined in the last defrosting process.
Further, the method further comprises:
if so, further judging whether the system starts an electric heating device, and determining that a refrigerant flow path of the system is a second refrigerant flow path under the condition that the system does not start the electric heating device;
wherein the second preset threshold is smaller than the first preset threshold; the electric heating device is arranged on a water inlet pipeline of the generator.
Further, after determining whether the system turns on the electric heating device, the method further comprises:
and under the condition that the system starts the electric heating device, whether the inlet water temperature is greater than a first preset threshold value is judged again.
By applying the technical scheme of the invention, the heat recovery system comprises: the first liquid pipe, the first air pipe and the generator comprise a second pipeline, the first liquid pipe is connected with a first refrigerant flow path and a second refrigerant flow path, the first refrigerant flow path is communicated with the first liquid pipe and the second pipeline through a first valve component, and the second refrigerant flow path is communicated with the first liquid pipe and the first air pipe through a second valve component. Therefore, the second refrigerant flow path can not pass through the generator, the risk that the pipeline in the unit is frozen due to the low-temperature refrigerant in the defrosting process can be reduced, the unit is protected, and the service performance of the unit is improved.
Drawings
FIG. 1 is a block diagram of a heat recovery system according to an embodiment of the present invention;
FIG. 2 is a block diagram of a heat recovery system according to an embodiment of the present invention;
FIG. 3 is a flow chart of a defrosting control method according to an embodiment of the present invention;
FIG. 4 is a flow chart of a defrosting control method according to an embodiment of the present invention;
FIG. 5 is a flow chart of a defrosting control method according to an embodiment of the present invention;
fig. 6 is a flowchart of a defrosting control method according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments, it being understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in itself. Thus, "module", "component" or "unit" may be used mixedly.
In order to solve the problem that the pipeline is easily damaged by defrosting when the temperature of the generator inlet water is too low in the related art, as shown in fig. 1, an embodiment of the present invention provides a heat recovery system, which includes:
a first liquid pipe 3, a first gas pipe 2, a generator 5, wherein the generator 5 comprises a second pipeline 9,
the first liquid pipe 3 is connected with the first refrigerant flow path and the second refrigerant flow path, the first refrigerant flow path communicates the first liquid pipe 3 and the second pipeline 9 with the first gas pipe 2 through the first valve component, and the second refrigerant flow path communicates the first liquid pipe 3 with the first gas pipe 2 through the second valve component.
Therefore, when the refrigerant flow path is the second refrigerant flow path, the refrigerant does not pass through the generator 5 (such as a hot water generator), the risk of icing of the pipeline in the unit caused by the low-temperature refrigerant in the defrosting process can be reduced, the unit can be protected, and the service performance of the unit can be improved.
It should be noted that, in the system shown in fig. 1, when it is determined that the refrigerant flow path is the second refrigerant flow path, the refrigerant can pass through the first liquid pipe 3 and the first gas pipe 2, and obviously does not need to pass through the generator 5, so that the purposes of protecting the unit and improving the service performance of the unit can be achieved.
In one possible implementation manner, the main controller may determine that the refrigerant flow path of the system is the first refrigerant flow path or the second refrigerant flow path according to the inlet water temperature. Specifically, when the inlet water temperature is greater than a first preset threshold value, a refrigerant flow path of the system is determined to be a first refrigerant flow path; and when the water inlet temperature is less than or equal to a first preset threshold value, determining the refrigerant flow path of the system as a second refrigerant flow path.
As shown in fig. 1, the first refrigerant flow path realizes the communication between the first liquid pipe 3 and the second line 9 and the first gas pipe 2 through the first valve assembly; the second refrigerant flow path realizes the communication between the first liquid pipe 3 and the first gas pipe 2 through a second valve component. The first valve assembly includes: and a first electronic expansion valve 10 disposed on the second pipeline 9 and located on the refrigerant outlet side of the generator 5. It can be understood that the refrigerant in the second pipeline 9 is gaseous refrigerant (in the second pipeline 9 located at the upper part in fig. 1) before flowing through the first electronic expansion valve 10, and the gaseous refrigerant is converted into liquid refrigerant (in the second pipeline 9 located at the lower part in fig. 1) after flowing through the first electronic expansion valve 10. The first valve assembly further comprises: and a refrigeration solenoid valve 7 disposed between the second pipeline 9 and the first air pipe 2. The second valve assembly includes: and the supercooling solenoid valve 4 is arranged between the first liquid pipe 3 and the first gas pipe 2. The system further comprises: the third air pipe 1, the heating electromagnetic valve 6 and the heating electromagnetic valve 6 are arranged between the third air pipe 1 and the second pipeline 9.
Specifically describing the refrigerant flow directions in the above two cases, in a possible implementation manner, the first refrigerant flow path is implemented by: controlling the first electronic expansion valve 10 to be opened, the heating electromagnetic valve 6 to be closed, the refrigerating electromagnetic valve 7 to be opened and the supercooling electromagnetic valve 4 to be closed; the second refrigerant flow path is realized by the following modes: and controlling the supercooling electromagnetic valve 4 to be opened and the refrigeration electromagnetic valve 7 to be closed. When the cooling solenoid valve 7 is closed, as can be seen from fig. 1, the refrigerant cannot flow through the generator 5, and only the second refrigerant flow path is needed, so long as the cooling solenoid valve 7 is closed and the supercooling solenoid valve 4 is opened, and the heating solenoid valve 6 and the first electronic expansion valve 10 are both in an open or closed state.
The generator 5 in the heat recovery system shown in fig. 1 may be a hot water generator, but is only an exemplary illustration, and it is understood that the generator shown in the present invention is not limited to a hot water generator. In the heat recovery system shown in fig. 1, the mode converter 8 is shown, and the mode converter 8 can connect the indoor unit and the outdoor unit, and in the heat recovery system shown in fig. 1, after passing through the mode converter 8, the number of pipes of the outdoor unit is changed from 3 to 2, that is, the second pipe 9 is led out from the first liquid pipe 3, and the third gas pipe 1 and the first gas pipe 2 are respectively connected with the second pipe 9. It will be appreciated that the mode converter 8 may not be provided.
Fig. 2 shows a connection relationship between the outdoor unit pipeline and the mode converter 8 and the generator 5 pipeline, and as shown in fig. 2, when the system is in a cooling mode, the refrigerant flows out from the exhaust port of the compressor 14, sequentially passes through the four-way valve 18, the condenser 17, the heating solenoid valve 15, and the electronic expansion valve 22, enters the first air pipe 2, passes through the cooling solenoid valve 7, the second pipeline 9, the first electronic expansion valve 10, the second pipeline 9 (it can be understood that the first electronic expansion valve 10 is disposed on the second pipeline 9), the first liquid pipe 3, and the electronic expansion valve 21, and then flows back to the compressor 14. When the system is in a heating mode, the refrigerant flows out of an exhaust port of the compressor 14, sequentially passes through the four-way valve 19, the electronic expansion valve 20, enters the third air pipe 1, passes through the heating electromagnetic valve 6, the second pipeline 9, the first electronic expansion valve 10, the second pipeline 9, the first liquid pipe 3 and the electronic expansion valve 21, and then flows back to the compressor 14. Wherein a fan 16 is arranged on the condenser side.
The first air pipe 2 is a low-pressure air pipe, and is an air pipe through which a refrigerant flows when the system is in a refrigerating state. The air inlet of the first air pipe 2 is connected with the air outlet of the compressor 14, and the air outlet of the first air pipe 2 is connected with the air inlet of the compressor 14. The third air pipe 1 is a high pressure air pipe through which the refrigerant flows when the system is in a heating state. The air inlet of the third air pipe 1 is connected with the air outlet of the compressor 14, and the air outlet of the third air pipe 1 is connected with the air inlet of the compressor 14. The first liquid pipe 3 is a pipeline through which refrigerant flows when the system is in a cooling state or a heating state. The inlet of the first liquid pipe 3 is connected to the outlet of the compressor 14 and the outlet of the first liquid pipe 3 is connected to the inlet of the compressor 14.
In one possible implementation, as shown in fig. 1 and 2, the system further includes: an electric heating device 13, wherein the electric heating device 13 is arranged on the water inlet pipe 11 of the generator 5. The water in the water inlet pipe 11 can be heated to change the inlet water temperature, thereby influencing the determination of the main controller on the refrigerant flow path. Wherein, the generator 5 shown in fig. 1 further comprises a water inlet pipe 11 and a water outlet pipe 12, and the electric heating device 13 is arranged on the water inlet pipe 11.
In one possible implementation, the system further includes: a heat recovery device (not shown), the heat recovery device comprising: the high-pressure air pipe is connected with the third air pipe 1; the low-pressure air pipe is connected with the first air pipe 2; the liquid pipe is connected with a first liquid pipe 3, and the heat recovery device is used for recovering the heat of the system. The hot water generator shown in figure 1 of the invention is of two-pipe system, the hot water generator can produce cold water or hot water, and can be connected with a water tank, a floor heating system, a fan coil, a heat storage device and the like, so that domestic hot water supply is realized, and the space heating and refrigerating requirements are met. The heat storage device is equivalent to a heat recovery device, and can recover redundant heat in the flowing process of the refrigerant, thereby avoiding energy waste and realizing effective utilization of energy. The heat recovery outer machine is a three-pipe system, the connecting end of the mode converter and the heat recovery outer machine is a three-pipe system, and the connecting end of the mode converter and the hot water generator is a two-pipe system.
Therefore, when the main controller determines that the refrigerant flow path is the second refrigerant flow path, the refrigerant does not pass through the generator 5, the risk of icing of the pipeline in the unit caused by the low-temperature refrigerant in the defrosting process can be reduced, the unit can be protected, and the service performance of the unit can be improved.
Fig. 3 illustrates a defrosting control method according to an embodiment of the present invention, the method including:
s101, detecting the water inlet temperature of a system;
and S102, determining whether a refrigerant flow path of the system is a first refrigerant flow path or a second refrigerant flow path according to the inlet water temperature.
Therefore, a proper defrosting mode can be selected according to the water inlet temperature, the risk that the pipeline in the unit is frozen due to a low-temperature refrigerant in the defrosting process is reduced, the unit can be protected, and the service performance of the unit is improved.
In one possible implementation manner, as shown in fig. 4, the step S102 of determining whether the refrigerant flow path of the system is the first refrigerant flow path or the second refrigerant flow path according to the incoming water temperature includes:
step S1021, judging whether the inlet water temperature is larger than a first preset threshold value or not;
step S1022, when the inlet water temperature is greater than a first preset threshold value, determining that a refrigerant flow path of the system is a first refrigerant flow path;
and S1023, when the inlet water temperature is less than or equal to a first preset threshold value, determining the refrigerant flow path of the system as a second refrigerant flow path.
The first preset threshold value is equivalent to a preset water temperature safety value, when the water temperature is greater than the first preset threshold value, it is indicated that the water temperature at this time is not in a freezing risk, a normal defrosting process can be adopted, taking the system shown in fig. 1 as an example, namely, a corresponding electromagnetic valve in a control mode converter is switched to a refrigerating state, and meanwhile, a first electronic expansion valve of a hot water generator is controlled to be opened for a certain number of steps, so that a refrigerant is normally subjected to heat exchange through the hot water generator, and the unit is defrosted. When the inlet water temperature is less than or equal to the first preset threshold value, which indicates that the unit is possibly in icing risk, the refrigerant flowing path of the unit is determined to be a second refrigerant flow path, so that the pipeline of the hot water generator can be prevented from being frozen, and the unit is prevented from being damaged.
In a possible implementation manner, when the temperature of the inlet water is greater than a first preset threshold, determining that a refrigerant flow path of the system is a first refrigerant flow path includes: the first valve assembly is controlled to be opened, the heating electromagnetic valve is controlled to be closed, and the second valve assembly is controlled to be closed. When the water inlet temperature is less than or equal to a first preset threshold value, the step of determining that the refrigerant flow path of the system is a second refrigerant flow path comprises the following steps: controlling the refrigeration electromagnetic valve to be closed and the second valve component to be opened; wherein the first valve assembly comprises: the first electronic expansion valve is arranged on the second pipeline and is positioned on the refrigerant outlet side of the second pipeline, and the refrigeration electromagnetic valve is arranged between the second pipeline and the first air pipe. The second valve assembly includes: and the supercooling electromagnetic valve is arranged between the first liquid pipe and the first air pipe. And the heating electromagnetic valve is arranged between the third air pipe and the second pipeline. As can be seen from fig. 1, the refrigerant cannot flow through the generator, and only the second refrigerant flow path is needed, so long as the refrigeration solenoid valve is closed and the supercooling solenoid valve is opened, and the heating solenoid valve and the first electronic expansion valve are in an open or closed state.
In one possible implementation manner, as shown in fig. 5, the step S1023 of determining that the refrigerant flow path of the system is the second refrigerant flow path when the water inlet temperature is less than or equal to the first preset threshold includes:
step S301, when the inlet water temperature is less than or equal to a first preset threshold, further judging whether the inlet water temperature is less than a second preset threshold; if not, executing step S302; if yes, executing step S303;
step S302, determining a refrigerant flow path of the system as the refrigerant flow path determined in the last defrosting process;
step S303, whether the system starts the electric heating device is further judged, and the refrigerant flow path of the system is determined to be a second refrigerant flow path under the condition that the electric heating device is not started by the system;
wherein the second preset threshold is smaller than the first preset threshold; the electric heating device is arranged on the water inlet pipeline of the generator.
Thus, when the inlet water temperature is less than the second preset threshold (which may be understood as a further preset water temperature safety threshold), it is indicated that there may be a risk of icing during defrosting. If the normal defrosting mode (namely the first refrigerant flow path) which is in a refrigerating state through the control mode converter is continuously adopted, the temperature of the inlet water of the hot water generator is further reduced. In order to avoid this situation, the embodiment of the present invention provides two preferable solutions, that is, it is first determined whether the system starts electrical heating, and when the system starts electrical heating, the water inlet temperature will gradually increase, and it may be determined whether the water inlet temperature is greater than the first preset threshold again, and the refrigerant flow path is determined according to the water inlet temperature. If the system is not started to be electrically heated, the refrigerant flow path of the system can be directly determined to be a second refrigerant path, and the supercooling electromagnetic valve can be controlled to be opened to a proper opening degree, the heating electromagnetic valve is closed, the refrigerating electromagnetic valve is closed and the first electronic expansion valve is closed (the supercooling electromagnetic valve can also be controlled to be opened to a proper opening degree and only the refrigerating electromagnetic valve is controlled to be closed), so that cold flow can exchange heat with the refrigerant in the first liquid pipe to supercool the refrigerant in the first liquid pipe when passing through the cold electromagnetic valve. The cold medium can be prevented from flowing to the hot water generator, and the heat exchange with the water in the hot water generator is avoided. Therefore, when the water temperature is low and the risk of icing exists, another defrosting mode is adopted, and the unit is protected while the defrosting effect is achieved.
In one possible implementation, after determining whether the system turns on the electric heating device, the method further includes: and under the condition that the system starts the electric heating device, whether the inlet water temperature is greater than a first preset threshold value is judged again.
Fig. 6 illustrates a defrosting control method according to an embodiment of the present invention, the method including:
s401, enabling the unit to enter a defrosting state;
s402, detecting the water inlet temperature of the hot water generator;
step S403, determine the influent water temperature > a? If yes, go to step S404; if not, executing step S405;
step S404, first control;
wherein the first control corresponds to a first refrigerant path in the implementation;
step S405, inlet water temperature < b? If yes, go to step S406; if not, executing step S407;
step S406, whether there is electric heating? If yes, go to step S408; if not, executing step S409;
step S407, control according to the last state;
step S408, starting electric heating; then step S403 is executed;
step S409, entering a second control mode;
the second control corresponds to the second refrigerant path in the above implementation.
Therefore, a proper defrosting mode can be selected according to the water inlet temperature, the risk that the pipeline in the unit is frozen due to a low-temperature refrigerant in the defrosting process is reduced, the unit can be protected, and the service performance of the unit is improved.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a mobile terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments illustrated in the drawings, the present invention is not limited to the embodiments, which are illustrative rather than restrictive, and it will be apparent to those skilled in the art that many more modifications and variations can be made without departing from the spirit of the invention and the scope of the appended claims.
Claims (13)
1. A defrosting control method characterized in that the method comprises:
detecting the water inlet temperature of the system;
determining a refrigerant flow path of the system as a first refrigerant flow path or a second refrigerant flow path according to the inlet water temperature; which comprises the following steps:
judging whether the water inlet temperature is greater than a first preset threshold value or not; when the inlet water temperature is greater than a first preset threshold value, determining a refrigerant flow path of the system as a first refrigerant flow path;
when the inlet water temperature is less than or equal to a first preset threshold value, determining a refrigerant flow path of the system as a second refrigerant flow path; which comprises the following steps: when the inlet water temperature is less than or equal to a first preset threshold value, further judging whether the inlet water temperature is less than a second preset threshold value; and if not, determining that the refrigerant flow path of the system is the refrigerant flow path determined in the last defrosting process.
2. The method of claim 1, wherein determining that the refrigerant flow path of the system is the first refrigerant flow path when the inlet water temperature is greater than a first predetermined threshold comprises:
controlling the first valve component to be opened, the heating electromagnetic valve to be closed and the second valve component to be closed;
wherein the first valve assembly comprises: the first electronic expansion valve is arranged on the second pipeline and is positioned on the refrigerant outlet side of the generator, and the refrigeration electromagnetic valve is arranged between the second pipeline and the first air pipe;
the second valve assembly includes: a supercooling solenoid valve disposed between the first liquid pipe and the first gas pipe,
the system also comprises a third air pipe, and the heating electromagnetic valve is arranged between the third air pipe and the second pipeline.
3. The method of claim 1, wherein determining that the refrigerant flow path of the system is a second refrigerant flow path when the inlet water temperature is less than or equal to a first preset threshold comprises:
controlling the refrigeration electromagnetic valve to be closed and the second valve component to be opened;
the refrigeration electromagnetic valve is arranged between the second pipeline and the first air pipe;
the second valve assembly includes: and the supercooling electromagnetic valve is arranged between the first liquid pipe and the first air pipe.
4. The method of claim 1, further comprising:
if so, further judging whether the system starts an electric heating device, and determining that a refrigerant flow path of the system is a second refrigerant flow path under the condition that the system does not start the electric heating device;
wherein the second preset threshold is smaller than the first preset threshold; the electric heating device is arranged on a water inlet pipeline of the generator.
5. The method of claim 4, wherein after determining whether the system turns on an electrical heating device, the method further comprises:
and under the condition that the system starts the electric heating device, whether the inlet water temperature is greater than a first preset threshold value is judged again.
6. A heat recovery system for performing the method of any one of claims 1-5, comprising: a first liquid pipe, a first air pipe and a generator, wherein the generator comprises a second pipeline,
the first liquid pipe is connected with a first refrigerant flow path and a second refrigerant flow path, the first refrigerant flow path communicates the first liquid pipe and the second pipeline with the first air pipe through a first valve assembly, and the second refrigerant flow path communicates the first liquid pipe with the first air pipe through a second valve assembly.
7. The system of claim 6,
the first valve assembly includes: and the first electronic expansion valve is arranged on the second pipeline and is positioned on the refrigerant outlet side of the generator.
8. The system of claim 7,
the first valve assembly further comprises: and the refrigeration electromagnetic valve is arranged between the second pipeline and the first air pipe.
9. The system of claim 6,
the second valve assembly includes: and the supercooling electromagnetic valve is arranged between the first liquid pipe and the first gas pipe.
10. The system of claim 6, further comprising: a third air pipe, a heating electromagnetic valve,
and the heating electromagnetic valve is arranged between the third air pipe and the second pipeline.
11. The system of claim 6, further comprising: and the electric heating device is arranged on the water inlet pipeline of the generator.
12. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the defrost control method of any one of claims 1 to 5 when executing the program.
13. A storage medium containing computer-executable instructions for performing the defrosting control method of any one of claims 1 to 5 when executed by a computer processor.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811341656.4A CN109595856B (en) | 2018-11-12 | 2018-11-12 | Heat recovery system and defrosting control method |
| PCT/CN2018/121907 WO2020098057A1 (en) | 2018-11-12 | 2018-12-19 | Heat recovery system and defrosting control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811341656.4A CN109595856B (en) | 2018-11-12 | 2018-11-12 | Heat recovery system and defrosting control method |
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| Publication Number | Publication Date |
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| CN109595856A CN109595856A (en) | 2019-04-09 |
| CN109595856B true CN109595856B (en) | 2020-01-17 |
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| CN201811341656.4A Active CN109595856B (en) | 2018-11-12 | 2018-11-12 | Heat recovery system and defrosting control method |
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| CN (1) | CN109595856B (en) |
| WO (1) | WO2020098057A1 (en) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6414569A (en) * | 1987-07-08 | 1989-01-18 | Toshiba Corp | Air-conditioning machine |
| JP5595140B2 (en) * | 2010-06-24 | 2014-09-24 | 三菱重工業株式会社 | Heat pump type hot water supply / air conditioner |
| CN102759193B (en) * | 2012-08-02 | 2014-11-26 | 广州星辰热能科技有限公司 | Air source heat pump system |
| CN203349585U (en) * | 2013-05-21 | 2013-12-18 | 康特能源科技(苏州)有限公司 | Anti-icing defrosting device |
| CN203478621U (en) * | 2013-08-13 | 2014-03-12 | 江苏天舒电器有限公司 | Anti-frozen controller used in heat pump water heater |
| CN103644690A (en) * | 2013-12-02 | 2014-03-19 | 陈志强 | Air-source heat pump defrosting system |
| CN105135689B (en) * | 2015-09-25 | 2018-04-06 | 广东美的暖通设备有限公司 | The antifreeze pre-warning and control method of circulation hot water dispenser and device |
| CN105865024B (en) * | 2016-04-26 | 2018-10-16 | 广东美的暖通设备有限公司 | Heat pump water-heating machine and its defrosting control method and device |
| CN205980489U (en) * | 2016-08-15 | 2017-02-22 | 韦超旺 | Energy -saving hot vapour defrosting system of air -source heat bump water heater |
| CN106642586B (en) * | 2016-12-29 | 2019-09-17 | 广东美的暖通设备有限公司 | A kind of classification defrosting method and device for air-cooled heat pump Parallel sets |
| CN108375145A (en) * | 2018-01-26 | 2018-08-07 | 青岛海尔空调电子有限公司 | A kind of heat pump system and its defrosting control method |
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2018
- 2018-11-12 CN CN201811341656.4A patent/CN109595856B/en active Active
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| WO2020098057A1 (en) | 2020-05-22 |
| CN109595856A (en) | 2019-04-09 |
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