CN111174437A - Control method of heat pump water heater - Google Patents
Control method of heat pump water heater Download PDFInfo
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- CN111174437A CN111174437A CN201811346113.1A CN201811346113A CN111174437A CN 111174437 A CN111174437 A CN 111174437A CN 201811346113 A CN201811346113 A CN 201811346113A CN 111174437 A CN111174437 A CN 111174437A
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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
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for 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
- F25B47/00—Arrangements for preventing or removing deposits or corrosion, not provided for in another subclass
- F25B47/02—Defrosting cycles
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Abstract
The invention discloses a control method of a heat pump water heater, which comprises the following steps: receiving a current ambient temperature; comparing the current environment temperature with a preset environment temperature, and judging whether the running time of the compressor is greater than or equal to a first preset time under the condition that the current environment temperature is less than the preset environment temperature; under the condition that the operation time length is greater than or equal to a first preset time length, judging whether the defrosting times of the evaporator reach the specified times or not after the compressor starts to work; and under the condition that the specified times are reached, judging whether the heat pump water heater needs to enter a defrosting mode or not according to at least one of the received environment temperature and the current evaporator temperature detected by the second temperature detection piece and the running time of the compressor. The control method of the heat pump water heater provided by the invention can intelligently select the heating mode and the defrosting mode, can improve the heating speed, reduce the defrosting times, greatly save energy, ensure high-energy-efficiency operation and better improve the user experience.
Description
Technical Field
The invention relates to the field of water heaters, in particular to a control method of a heat pump water heater.
Background
At present, domestic water heater products mainly comprise an electric water heater, a gas water heater, a solar water heater, an air energy water heater, an instant heat pump water heater and the like. The heat pump water heater has outstanding energy-saving characteristic, can obtain a large amount of heat from the air, generates heat of 3-4 degrees of electricity when consuming 1 degree of electricity, can save 70% -80% of electricity charge compared with the conventional water heater, and has the use cost equivalent to 1/4 of that of an electric water heater, 1/2 of that of a gas water heater and 1/3 of that of a solar water heater.
Specifically, the heat pump water heater is a device which transfers heat from a low-temperature object to high-temperature water through a medium (refrigerant) by utilizing the inverse carnot principle. The heat pump water heater has the working process that the compressor compresses low-pressure refrigerant at the outlet of the evaporator and then the low-pressure refrigerant is changed into high-temperature high-pressure gas to be discharged, the high-temperature high-pressure refrigerant gas flows through the condenser to be cooled and then is changed into phase, so that heat is transferred into water in the liner through the condenser, liquid refrigerant enters the evaporator through the expansion valve, and the liquid refrigerant is quickly evaporated into a gas state at the position due to the lower pressure at the evaporator side and absorbs a large amount of heat. Meanwhile, under the action of the fan, a large amount of air flows through the outer surface of the evaporator, energy in the air is absorbed by the evaporator, and the temperature of the air is rapidly reduced. And then the refrigerant absorbing certain energy flows back to the compressor and enters the next cycle.
When the heat pump water heater is operated in a low temperature environment, if the temperature and the humidity reach certain conditions, frost may be formed on the surface of the evaporator. Over time, if the frost layer is not removed, the frost layer becomes thicker and thicker, so that the heating performance of the heat pump water heater is gradually affected, and even the heat pump water heater cannot normally heat.
At present, the defrosting mode that adopts is mainly: and reverse defrosting, which is to set a fixed heating operation period, defrost after the operation period is finished until a defrosting exit condition is reached, and then enter the heating operation period again. The applicant found that: the heat pump water heater performs defrosting by using the conventional defrosting method, and has the following problems.
First, when the evaporator is not frosted or a small amount of frost is formed but the normal operation of the evaporator is not affected, the heat pump water heater also enters the defrosting mode periodically. This has just resulted in the very big waste of the energy, also can reduce heat pump water heater's rate of heating simultaneously, and then can influence this heat pump water heater's efficiency, is more unfavorable for guaranteeing user's use and experiences.
Secondly, for example, under the working conditions of low ambient temperature and high humidity, frost may be formed on the evaporator immediately after the operation is started, or the frost forming speed on the evaporator is relatively high. However, since a predetermined period of time is required to enter the defrost mode, the evaporator continues to frost for a predetermined period of time, and eventually a thicker frost layer may be reached. When the subsequent heat pump water heater enters the defrosting mode, the time for defrosting is longer for the thicker frost layer, energy waste can be caused, the heating speed of the heat pump water heater is reduced, meanwhile, the energy efficiency of the heat pump water heater is influenced, and the use experience of a user is not guaranteed.
In addition, if a fixed defrosting mode is operated to defrost the thick frost layer, the frost layer may not be removed, and the evaporator is always in a frosted operation state after the heat pump water heater is operated for a plurality of cycles, which may also affect the service life of the evaporator. When frost builds to a certain thickness, it may also cause the evaporator to fail to operate.
On the whole, current heat pump water heater can't do nimble mode of selecting to heat and defrost according to operating condition, has caused the very big waste of the energy, also can reduce heat pump water heater's rate of heating simultaneously, influences this heat pump water heater's efficiency, is more unfavorable for guaranteeing that the user has the preferred and uses the experience.
Disclosure of Invention
The invention aims to provide a control method of a heat pump water heater, the heat pump water heater operated according to the control method can intelligently select a heating mode and a defrosting mode, can improve the heating speed, reduce the defrosting times, greatly save energy, ensure high-energy-efficiency operation and better improve the user experience.
The above object of the present invention can be achieved by the following technical solutions:
a control method of a heat pump water heater, the control method comprising:
receiving the current environment temperature detected by the first temperature detection piece;
comparing the current environment temperature with a preset environment temperature, and judging whether the running time of the compressor is greater than or equal to a first preset time under the condition that the current environment temperature is less than the preset environment temperature;
under the condition that the operation time length is greater than or equal to the first preset time length, judging whether the defrosting times of the evaporator reach the specified times or not after the compressor starts to work;
and under the condition that the specified times are reached, judging whether the heat pump water heater needs to enter a defrosting mode or not according to at least one of the received environment temperature and the current evaporator temperature detected by the second temperature detection piece and the running time of the compressor.
Further, the determining, according to at least one of the received ambient temperature and the current evaporator temperature and the operation duration of the compressor, whether the heat pump water heater needs to enter the defrosting mode includes:
comparing the current evaporator temperature with a first preset temperature;
and under the condition that the current evaporator temperature is less than or equal to the first preset temperature, judging whether the running time of the compressor is more than or equal to a second preset time, if so, controlling the heat pump water heater to enter a defrosting mode, wherein the second preset time is more than the first preset time.
Further, the control method further includes: and under the condition that the running time of the compressor is less than the second preset time, continuously comparing the current evaporator temperature with a first preset temperature.
Further, the determining, according to at least one of the received ambient temperature and the current evaporator temperature and the operation duration of the compressor, whether the heat pump water heater needs to enter the defrosting mode includes:
comparing the current evaporator temperature with a second preset temperature;
and under the condition that the current evaporator temperature is less than or equal to the second preset temperature, judging whether the running time of the compressor is more than or equal to a third preset time, judging whether the difference value between the current environment temperature and the evaporator temperature is more than or equal to the third preset temperature, and if the judgment result is yes, controlling the heat pump water heater to enter a defrosting mode, wherein the third preset time is more than the first preset time.
Further, the control method further includes:
and if at least one of the judgment results is negative, maintaining the step of comparing the current evaporator temperature with a second preset temperature.
Further, the controlling the heat pump water heater to enter the defrosting mode includes:
controlling the compressor to stop running;
and switching the communication relation among the compressor, the evaporator and the condenser by using a switching device in a preset time before the compressor operates again.
Further, the controller stores a preset change rate of the current evaporator temperature; the control method further comprises the following steps:
and judging whether the current evaporator temperature detected by the second temperature detection piece in real time reaches a preset exit temperature or whether the change rate of the evaporator temperature is greater than or equal to the preset change rate, and if so, controlling the heat pump water heater to exit the defrosting mode.
Further, the control method further includes: and after the compressor is started, acquiring the switching times of the switching device, and determining the defrosting times of the evaporator according to the switching times.
Further, the control method further includes: and when the current environment temperature is smaller than the preset environment temperature and the running time of the compressor is smaller than the first preset time, maintaining the step of comparing the current evaporator temperature with a second preset temperature.
A control method of a heat pump water heater, the control method comprising:
receiving the current environment temperature detected by the first temperature detection piece;
comparing the current environment temperature with a preset environment temperature, and judging whether the running time of the compressor is greater than or equal to a first preset time under the condition that the current environment temperature is less than the preset environment temperature;
under the condition that the operation time length is greater than or equal to the first preset time length, judging whether the defrosting times of the evaporator reach the specified times or not after the compressor starts to work;
and under the condition that the specified times are not reached, controlling the heat pump water heater to enter a defrosting mode.
Further, the method also comprises the following steps: and after the compressor is started, acquiring the switching times of a switching device for switching the heating mode and the defrosting mode of the heat pump water heater, and determining the defrosting times of the evaporator according to the switching times.
According to the technical scheme provided by the embodiment of the application, the control method of the heat pump water heater provided by the application obtains the current environment temperature through the first temperature detection piece, and then compares the obtained current environment temperature with the stored preset environment temperature; and under the condition that the current environment temperature is lower than the preset environment temperature, judging whether the running time of the compressor is longer than or equal to a first preset time. Under the condition that the operation time length is greater than or equal to the first preset time length, judging whether the defrosting times of the evaporator reach the specified times or not after the compressor starts to work; and under the condition that the specified times are not reached, controlling the heat pump water heater to enter a defrosting mode, completing primary defrosting, and avoiding frost-carrying starting of the heat pump water heater.
On the whole, after the control method is applied, when the heat pump water heater operates, whether the first defrosting is needed or not can be judged under the condition of low environmental temperature, and long-time defrosting operation after the evaporator is started is avoided; after the first defrosting is finished, judging whether the heat pump water heater needs to enter a defrosting mode or not by combining at least one of the ambient temperature and the current evaporator temperature with the running time of the compressor; in addition, under the condition of higher temperature, the controller can directly skip the judgment of first defrosting, and when the heat pump water heater is started, the controller judges whether the heat pump water heater needs to enter the defrosting mode or not by combining at least one of the environment temperature and the current evaporator temperature and the running time of the compressor, so that the heating mode and the defrosting mode can be intelligently selected according to the environment temperature and the actual frosting condition on the evaporator in the using process of the heat pump water heater, the heating speed can be increased, the defrosting times can be reduced, the energy can be greatly saved, the high-energy-efficiency running can be ensured, and the user experience can be better improved.
Drawings
Fig. 1 is a schematic view of a heat pump water heater provided in an embodiment of the present application in a heating mode;
FIG. 2 is a schematic view of a heat pump water heater provided in accordance with an embodiment of the present application in a defrost mode;
FIG. 3 is a flow chart illustrating steps of a method for controlling a heat pump water heater according to an embodiment of the present application;
fig. 4 is a schematic diagram illustrating a control principle of a heat pump water heater according to an embodiment of the present application.
Description of reference numerals:
1-a compressor; 2-a switching device; 3-an evaporator; 31-a fan; 32-a second temperature detection member; 4-a pressure regulating device; 5-a condenser; 50-inner container; 6-a first temperature detection member; 7-a first branch; 8-a second branch; 9-third branch.
Detailed Description
The technical solutions of the present invention will be described in detail with reference to the accompanying drawings and specific embodiments, it should be understood that these embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention, and various equivalent modifications of the present invention by those skilled in the art after reading the present invention fall within the scope of the appended claims.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The heat pump water heater operated according to the control method can intelligently select a heating mode and a defrosting mode, can improve the heating speed, reduce the defrosting times, greatly save energy, ensure high-energy-efficiency operation and better improve the user experience.
Referring to fig. 1 and 2, a heat pump water heater applying the control method in the embodiment of the present application may include: a compressor 1, a switching device 2 for switching a flow path of a fluid discharged from the compressor 1, an evaporator 3, a pressure adjusting device 4, and a condenser 5; a first temperature detection member 6 for acquiring an ambient temperature; a second temperature detection member 32 for acquiring an evaporation temperature of the evaporator 3; and the controller is electrically connected with the first temperature detection piece 6, the second temperature detection piece 32, the compressor 1 and the switching device 2. When the switching device 2 is in the first communication state, the heat pump water heater is in the heating mode, and when the switching device 2 is in the second communication state, the heat pump water heater is in the defrosting mode.
In the present embodiment, the compressor 1 is used to compress a low-pressure refrigerant into a high-temperature high-pressure gas. Specifically, the compressor 1 may be an inverter compressor or a fixed frequency compressor, and the application is not limited in this respect. Preferably, the compressor 1 may be an inverter compressor. When the compressor 1 is a variable frequency compressor, the output energy can be continuously changed by controlling the rotating speed to be continuously adjusted within a certain range.
In the present embodiment, the switching device 2 may be located between the outlet and the inlet of the compressor 1 for switching the flow path of the fluid discharged from the compressor 1. In particular, the switching device 2 may be in the form of a four-way valve. The four-way valve has four ports, two of which are used to connect the compressor 1 and the other two of which are used to connect the evaporator 3 and the condenser 5.
In the present embodiment, the condenser 5 is provided in the inner container 50, and when a high-temperature and high-pressure refrigerant flows through the condenser 5, heat can be transferred to the water in the inner container 50.
In the present embodiment, the pressure adjusting device 4 may be configured to throttle and depressurize the refrigerant flowing out of the condenser 5. Specifically, the pressure adjusting device 4 is disposed in the refrigerant passage, and the opening degree thereof is adjustable. Specifically, the pressure adjusting device 4 may be in the form of an electronic expansion valve, a thermostatic expansion valve, or other forms with adjustable opening degree, and the present application is not limited specifically herein.
In the present embodiment, the evaporator 3 is used for exchanging heat between the low-temperature refrigerant liquid and the outside air, where the liquid refrigerant is rapidly evaporated to become a gas state and absorbs a large amount of heat.
In the present embodiment, the fan 31 may supply air to the evaporator 3. Specifically, the fan 31 may be a direct current fan 31 with stepless speed regulation or an alternating current fan 31 with multistage speed regulation, and the application is not limited in this respect.
In the present embodiment, as shown in fig. 1, when the switching device 2 is in the first communication state, the compressor 1, the condenser 5, the pressure regulator 4, and the evaporator 3 may be sequentially communicated through the refrigerant passage, and the heat pump water heater enters the heating mode. As shown in fig. 2, when the switching device 2 is in the second communication state, the compressor 1, the evaporator 3, the pressure regulator 4, and the condenser 5 are sequentially communicated through the refrigerant flow path, and the heat pump water heater enters the defrosting mode.
In addition, this heat pump water heater still is provided with: a first temperature detection member 6 for acquiring a current ambient temperature; a second temperature detection member 32 for acquiring an evaporation temperature of the evaporator 3; and the controller is electrically connected with the first temperature detection piece 6, the second temperature detection piece 32, the compressor 1 and the switching device 2.
Referring to fig. 3 to 4 together, a method for controlling a heat pump water heater according to an embodiment of the present disclosure may include the following steps:
step S10: receiving the current environment temperature detected by the first temperature detection piece;
step S12: comparing the current environment temperature with a preset environment temperature, and judging whether the running time of the compressor is greater than or equal to a first preset time under the condition that the current environment temperature is less than the preset environment temperature;
step S14: under the condition that the operation time length is greater than or equal to the first preset time length, judging whether the defrosting times of the evaporator reach the specified times or not after the compressor starts to work;
step S15: under the condition that the specified times are not reached, controlling the heat pump water heater to enter a defrosting mode;
step S16: and under the condition that the specified times are reached, judging whether the heat pump water heater needs to enter a defrosting mode or not according to at least one of the received environment temperature and the current evaporator temperature detected by the second temperature detection piece and the running time of the compressor.
In the process of converting the liquid refrigerant into the gas in the evaporator 3, a large amount of heat needs to be absorbed into the air, and the temperature of the air around the evaporator 3 is relatively low. Generally, the evaporator 3 is generally installed in an outdoor environment in order to guarantee the user experience. However, under the condition that the ambient temperature is lower than a certain temperature and a certain humidity exists in the air, the surface of the evaporator 3 in the outdoor environment is easily frosted.
And in the case that the current ambient temperature is lower than the preset ambient temperature, indicating that the ambient temperature reaches the frosting condition at the moment. Before the heat pump water heater is started, the evaporator 3 is likely to frost under the coordination of the external temperature and the humidity. After the heat pump water heater is started, the evaporator 3 is probably in a frosted operation state, which is not beneficial to ensuring the heating operation of the heat pump water heater.
In order to avoid long-time frosting operation after the heat pump water heater is started, in the embodiment, the controller may store a preset ambient temperature. When the heat pump water heater is started to operate, the controller can firstly obtain the current ambient temperature through the first temperature detection element 6, and then compare the obtained current ambient temperature with the stored preset ambient temperature. And under the condition that the current environment temperature is lower than the preset environment temperature, judging whether the running time of the compressor 1 is longer than or equal to a first preset time. Under the condition that the operation time length is greater than or equal to the first preset time length, judging whether the defrosting times of the evaporator 3 reach the specified times or not after the compressor 1 starts to work; and under the condition that the specified times are not reached, controlling the heat pump water heater to enter a defrosting mode, completing the first defrosting, and avoiding the frost-carrying starting of the heat pump water heater.
When the current ambient temperature is greater than or equal to the preset ambient temperature, it indicates that the ambient temperature is relatively high at this time, and the evaporator 3 is less likely to frost at the ambient temperature. Even if there is a small amount of frost on the evaporator 3 at the last shutdown, it is likely to automatically melt in an environment where the current temperature is high.
The preset ambient temperature stored by the controller may be determined according to the frosting condition of the evaporator 3, and the application is not limited herein. Generally, the preset ambient temperature may be about 7 ℃. That is, when the ambient temperature is lower than 7 degrees celsius, frost is easily formed on the evaporator 3.
The first preset time period for starting the compressor 1 may be a short time period, for example, about 30 minutes, and the like, specifically, a person skilled in the art may make corresponding matching and adjustment according to actual operating parameters of a specific heat pump water heater, and the present application is not limited herein. The first preset time is mainly used for ensuring that the heat pump water heater enters a stable operation condition after being started. When the temperature of the compressor 1 rises after the operation for a predetermined period of time, the compressor enters a normal operation state from a shutdown state, so that the subsequent defrosting has higher defrosting efficiency.
The number of times of the specification may be one or more, and the application is not particularly limited herein. For example, when the specified number of times is one, and the number of times of defrosting of the evaporator 3 does not reach one, it indicates that the heat pump water heater is in the first heating mode after shutdown, and at this time, it is very necessary to determine whether the evaporator 3 is defrosted for the first time; when the evaporator 3 is judged to be defrosted for the first time, the connection position of the switching device 2 is changed to be changed from the first connection state to the second connection state, the heat pump water heater is controlled to enter a defrosting mode, and long-time defrosting operation after the heat pump water heater is started is avoided.
In one embodiment, in order to accurately identify whether the heat pump water heater is first defrosted, the controller electrically connected to the switching device 2 may be further provided with a counting module. The counting module is used for recording the switching times of the switching device 2. For example, when the switching device 2 is switched from the first state to the second state, the counting module increments by 1. And after the compressor 1 is started, acquiring the switching times of the switching device 2, and determining the defrosting times of the evaporator 3 according to the switching times. When the heat pump water heater is shut down, the counting module is automatically reset. For example, when the heat pump water heater is started, the accumulated number of times in the counting module is 0, which indicates that the current heat pump water heater has not entered the defrosting mode.
It is possible for the evaporator 3 to operate at a higher ambient temperature without the controller having to determine whether a first defrost needs to be performed. At this time, the controller may determine whether the heat pump water heater needs to enter the defrosting mode according to the received at least one of the ambient temperature and the current evaporator temperature detected by the second temperature detecting element 32 and the operation time of the compressor 1.
In another case, when the number of times of defrosting of the evaporator 3 reaches the specified number of times, and when the evaporator 3 has completed the first defrosting, and the subsequent heat pump water heater is running, the controller may determine whether the heat pump water heater needs to enter the defrosting mode according to the received at least one of the ambient temperature and the current evaporator temperature detected by the second temperature detecting element 32 and the running duration of the compressor 1, without determining whether the first defrosting needs to be performed again by combining the current ambient temperature and the duration of the compressor 1.
For example, when the designated number of times is at least one, for the case that the ambient temperature is low, the heat pump water heater has already entered the defrosting mode at least one time, and there may be no frost or substantially no frost on the evaporator 3, and the evaporator 3 can enter the normal operating state after the first defrosting. Subsequently, the controller may determine whether the heat pump water heater needs to enter the defrosting mode according to the received at least one of the ambient temperature and the current evaporator temperature detected by the second temperature detecting element 32 and the operation time of the compressor 1.
The experimental data show that: compared with the existing heat pump water heater which enters a defrosting mode in a fixed period, the heat pump water heater applying the control method in the embodiment of the application also heats the water temperature from 10 ℃ to 52 ℃ under the condition that the ambient temperature is minus 7 ℃, the heat pump water heater applying the control method in the embodiment of the application has the switching times of the switching device 2 of 4 times and the heating time of 4 hours and 56 minutes; the switching frequency of the switching device 2 of the existing heat pump water heater is 10 times, and the heating time is 7 hours and 24 minutes.
Overall, the control method of the heat pump water heater provided by the embodiment of the present application can determine whether to perform the first defrosting operation under the condition of low ambient temperature, and avoid long-time defrosting operation after the evaporator 3 is started; after the first defrosting is finished, whether the heat pump water heater needs to enter a defrosting mode or not can be judged by combining at least one of the ambient temperature and the current evaporator temperature with the operation duration of the compressor 1; in addition, under the condition of higher temperature, the controller can directly skip the judgment of first defrosting, and when the heat pump water heater is started, the controller judges whether the heat pump water heater needs to enter the defrosting mode or not by combining at least one of the environment temperature and the current evaporator temperature with the running time of the compressor 1, so that the heating mode and the defrosting mode can be intelligently selected according to the environment temperature and the actual frosting condition on the evaporator 3 in the using process of the heat pump water heater, the heating speed can be increased, the defrosting times can be reduced, the energy can be greatly saved, the high-energy-efficiency running can be ensured, and the user experience can be better improved.
In one embodiment, the determining whether the heat pump water heater needs to enter the defrosting mode according to the received at least one of the ambient temperature and the current evaporator temperature and the operation time of the compressor 1 may include: comparing the current evaporator temperature with a first preset temperature; and under the condition that the current evaporator temperature is less than or equal to the first preset temperature, judging whether the running time of the compressor 1 is more than or equal to a second preset time, if so, controlling the heat pump water heater to enter a defrosting mode, wherein the second preset time is more than the first preset time.
In this embodiment, when the current evaporator temperature is less than or equal to the first preset temperature, it indicates that the evaporator 3 has a small amount of frost, and in order to avoid long-term operation of the evaporator 3 with frost, the heat pump water heater may be controlled to enter the defrosting mode after the compressor 1 operates for the second preset time period. The first preset temperature may be correspondingly matched and adjusted according to actual operating parameters of the heat pump water heater, and the application is not specifically limited herein.
Generally, when there is a small amount of frost on the evaporator 3, the normal use of the evaporator 3 is not largely affected. However, in order to avoid that the frost on the evaporator 3 is more and more over time, on one hand, the normal working performance of the evaporator is affected, and on the other hand, the time for subsequent defrosting is prolonged, and after the heat pump water heater is operated in the heating mode for a reasonable period of time, the heat pump water heater needs to be controlled to enter the defrosting mode. The second preset time period is longer than the first preset time period, and specifically, the second preset time period may be about 90 minutes. Of course, the second preset time period may not be limited to the above examples, and those skilled in the art may make corresponding matching and adjustment according to the actual operating parameters of a specific heat pump water heater, and the application is not limited herein.
Further, the control method may further include: and under the condition that the running time of the compressor 1 is less than the second preset time, continuously comparing the current evaporator temperature with a first preset temperature.
In this embodiment, the current evaporator temperature and the first preset temperature are in continuous comparison, and when the operation duration of the compressor 1 does not reach the second preset duration, the current evaporator temperature is kept to be compared with the first preset temperature until the operation duration of the compressor 1 reaches the second preset duration, and the heat pump water heater is controlled to enter the defrosting mode.
In another embodiment, the determining whether the heat pump water heater needs to enter the defrosting mode according to the received at least one of the ambient temperature and the current evaporator temperature and the operation time of the compressor 1 may include: and comparing the current evaporator temperature with a second preset temperature, judging whether the running time of the compressor 1 is greater than or equal to a third preset time under the condition that the current evaporator temperature is less than or equal to the second preset temperature, judging whether the difference value between the current environment temperature and the evaporator temperature is greater than or equal to the third preset temperature, and controlling the heat pump water heater to enter a defrosting mode if the judgment results are yes, wherein the third preset time is greater than the first preset time.
The judgment condition is mainly to realize timely checking of the frosting condition on the evaporator 3 and timely defrosting when the heat pump water heater operates in a low-temperature environment. In the present embodiment, in the case where the current evaporator temperature is less than or equal to the second preset temperature, it indicates that the evaporator 3 has a large amount of frost formation at a fast speed. The second preset temperature is lower than the first preset temperature, and specifically, the second preset temperature may be correspondingly matched and adjusted according to actual operating parameters of the heat pump water heater, which is not specifically limited herein. Accordingly, the current ambient temperature is also generally low.
In order to avoid that the evaporator 3 frosts to a certain extent in a low-temperature environment and influences the normal operation of the heat pump water heater, the heat pump water heater can be controlled to enter the defrosting mode when the compressor 1 operates for a third preset time and the difference between the current environment temperature and the evaporator temperature is greater than or equal to the third preset temperature. The third preset time period is longer than the first preset time period and shorter than the second preset time period, and specifically, the third preset time period may be about 60 minutes. Of course, the third preset time period may not be limited to the above examples, and those skilled in the art may make corresponding matching and adjustment according to the actual operating parameters of a specific heat pump water heater, and the application is not limited herein. When the difference between the current ambient temperature and the evaporator temperature is greater than or equal to a third preset temperature, it indicates that the frost formation on the evaporator 3 is serious at this time, and the defrosting needs to be performed in time. Specifically, the third preset temperature may be between 0 degrees celsius and 10 degrees celsius. Of course, the third preset temperature may not be limited to the above example, and those skilled in the art may make corresponding matching and adjustment according to the actual operating parameters of a specific heat pump water heater, and the application is not limited thereto.
Further, the control method may further include: and if at least one of the judgment results is negative, comparing the current evaporator temperature with a second preset temperature.
In this embodiment, the current evaporator temperature and the second preset temperature are in continuous comparison, when the operation duration of the compressor 1 does not reach a third preset duration, the current evaporator temperature and the second preset temperature are kept to be compared until the operation duration of the compressor 1 reaches the third preset duration, and then the heat pump water heater is controlled to enter the defrosting mode by combining the difference value between the evaporator temperature and the ambient temperature.
Generally, when the heat pump water heater is switched from the heating mode to the defrosting mode, the compressor 1 needs to be stopped so that the switching device 2 can perform switching.
In one embodiment, the controlling the heat pump water heater to enter the defrost mode may include: controlling the compressor 1 to stop running; and switching the communication relation of the compressor 1 with the evaporator 3 and the condenser 5 by using a switching device 2 in a preset time period before the compressor 1 is operated again.
When the communication relation between the compressor 1 and the evaporator 3 and the condenser 5 is switched by the switching device 2 in a preset time before the compressor 1 operates again, the switching device 2 has small impact and low noise when switching because the pressure difference in the whole system of the heat pump water heater is small; meanwhile, the switching device 2 can quickly balance the high pressure and the low pressure of the system during switching, and the subsequent starting of the compressor 1 with pressure difference is avoided.
Further, the controller stores a preset change rate of the current evaporator temperature; the control method may further include: and judging whether the current evaporator temperature detected by the second temperature detection part 32 in real time reaches a preset exit temperature or whether the change rate of the evaporator temperature is greater than or equal to the preset change rate, and if so, controlling the heat pump water heater to exit the defrosting mode.
Referring to fig. 4, in a specific application scenario, the heat pump water heater control method according to the embodiment of the present application may implement switching between the heating mode and the defrosting mode by different control logics.
When the heat pump water heater is started, when the environmental temperature Ta is low, for example, below 7 ℃, the controller of the heat pump water heater enters the first branch circuit 7 for judgment, after the condition that at least the operation t1 of the compressor 1 enters a stable operation state is met, the controller judges whether the defrosting mode is performed for the first time, and when the defrosting condition is met for the first time, the controller enters the defrosting mode and the heating mode is converted into the defrosting mode. When the first defrosting is finished, the second branch 8 or the third branch 9 is selectively entered according to the actual temperature Te of the evaporator 3. And under the condition that corresponding conditions are met, the heating mode is switched to the defrosting mode.
After the compressor 1 is started again to enter the defrosting mode, when the controller of the heat pump water heater enters the first branch for judgment, the condition of first defrosting is found not to be met any more, at the moment, the controller selectively enters the second branch 8 or the third branch 9, and the control logic of the first branch 7 is not repeatedly executed. Wherein the preset temperature Tset2 for the evaporator 3 in the second branch 8 is higher than the preset temperature Tset3 for the evaporator 3 in the third branch 9; the preset time period t3 for the second branch 8 operating for the compressor 1 is shorter than the preset time period t3 for the third branch 9 operating for the compressor 1; tset1 is the difference between ambient temperature Ta and evaporator temperature Te.
The above embodiments in the present specification are all described in a progressive manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment is described with emphasis on being different from other embodiments.
The above description is only a few examples of the present invention, and although the embodiments of the present invention are described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A control method of a heat pump water heater is characterized by comprising the following steps:
receiving the current environment temperature detected by the first temperature detection piece;
comparing the current environment temperature with a preset environment temperature, and judging whether the running time of the compressor is greater than or equal to a first preset time under the condition that the current environment temperature is less than the preset environment temperature;
under the condition that the operation time length is greater than or equal to the first preset time length, judging whether the defrosting times of the evaporator reach the specified times or not after the compressor starts to work;
and under the condition that the specified times are reached, judging whether the heat pump water heater needs to enter a defrosting mode or not according to at least one of the received environment temperature and the current evaporator temperature detected by the second temperature detection piece and the running time of the compressor.
2. The method for controlling a heat pump water heater according to claim 1, wherein the determining whether the heat pump water heater needs to enter the defrosting mode according to the received at least one of the ambient temperature and the current evaporator temperature and the operation time of the compressor comprises:
comparing the current evaporator temperature with a first preset temperature;
and under the condition that the current evaporator temperature is less than or equal to the first preset temperature, judging whether the running time of the compressor is more than or equal to a second preset time, if so, controlling the heat pump water heater to enter a defrosting mode, wherein the second preset time is more than the first preset time.
3. The control method of the heat pump water heater according to claim 2, characterized by further comprising: and under the condition that the running time of the compressor is less than the second preset time, continuously comparing the current evaporator temperature with a first preset temperature.
4. The method for controlling a heat pump water heater according to claim 1, wherein the determining whether the heat pump water heater needs to enter the defrosting mode according to the received at least one of the ambient temperature and the current evaporator temperature and the operation time of the compressor comprises:
comparing the current evaporator temperature with a second preset temperature;
and under the condition that the current evaporator temperature is less than or equal to the second preset temperature, judging whether the running time of the compressor is more than or equal to a third preset time, judging whether the difference value between the current environment temperature and the evaporator temperature is more than or equal to the third preset temperature, and if the judgment result is yes, controlling the heat pump water heater to enter a defrosting mode, wherein the third preset time is more than the first preset time.
5. The control method of the heat pump water heater according to claim 4, characterized by further comprising:
and if at least one of the judgment results is negative, comparing the current evaporator temperature with a second preset temperature.
6. The control method of the heat pump water heater according to any one of claims 1, 2 or 4, wherein the controlling the heat pump water heater to enter the defrosting mode includes:
controlling the compressor to stop running;
and switching the communication relation among the compressor, the evaporator and the condenser by using a switching device in a preset time before the compressor operates again.
7. The control method of the heat pump water heater according to claim 6, wherein a preset rate of change of the current evaporator temperature is stored in the controller; the control method further comprises the following steps:
and judging whether the current evaporator temperature detected by the second temperature detection piece in real time reaches a preset exit temperature or whether the change rate of the evaporator temperature is greater than or equal to the preset change rate, and if so, controlling the heat pump water heater to exit the defrosting mode.
8. The control method of the heat pump water heater according to claim 6, characterized by further comprising: and after the compressor is started, acquiring the switching times of the switching device, and determining the defrosting times of the evaporator according to the switching times.
9. The control method of the heat pump water heater according to claim 1, characterized by further comprising: and when the current environment temperature is smaller than the preset environment temperature and the running time of the compressor is smaller than the first preset time, maintaining the step of comparing the current environment temperature with the preset environment temperature.
10. A control method of a heat pump water heater is characterized by comprising the following steps:
receiving the current environment temperature detected by the first temperature detection piece;
comparing the current environment temperature with a preset environment temperature, and judging whether the running time of the compressor is greater than or equal to a first preset time under the condition that the current environment temperature is less than the preset environment temperature;
under the condition that the operation time length is greater than or equal to the first preset time length, judging whether the defrosting times of the evaporator reach the specified times or not after the compressor starts to work;
and under the condition that the specified times are not reached, controlling the heat pump water heater to enter a defrosting mode.
11. The control method of the heat pump water heater according to claim 10, further comprising: and after the compressor is started, acquiring the switching times of a switching device for switching the heating mode and the defrosting mode of the heat pump water heater, and determining the defrosting times of the evaporator according to the switching times.
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| CN201811346113.1A CN111174437B (en) | 2018-11-13 | 2018-11-13 | Control method of heat pump water heater |
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