CN106288402B - Heat-pump water heater and its anti-freezing method - Google Patents
Heat-pump water heater and its anti-freezing method Download PDFInfo
- Publication number
- CN106288402B CN106288402B CN201510240206.6A CN201510240206A CN106288402B CN 106288402 B CN106288402 B CN 106288402B CN 201510240206 A CN201510240206 A CN 201510240206A CN 106288402 B CN106288402 B CN 106288402B
- Authority
- CN
- China
- Prior art keywords
- water
- temperature
- freezing
- heat exchanger
- heat pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 403
- 238000007710 freezing Methods 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 238000010438 heat treatment Methods 0.000 claims description 62
- 230000008014 freezing Effects 0.000 claims description 23
- 230000002265 prevention Effects 0.000 claims description 17
- 239000003507 refrigerant Substances 0.000 claims description 14
- 230000002528 anti-freeze Effects 0.000 abstract description 15
- 108010053481 Antifreeze Proteins Proteins 0.000 abstract description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The present invention relates to heat-pump water heater and its anti-freezing methods.The present invention provides a kind of anti-freezing methods of heat-pump water heater, comprising: when determining that water circulation pipe needs antifreeze, detects the water temperature in water tank, obtains the first temperature detection value；The first temperature detection value is judged whether less than the first preset value, if so, executing the first anti-freeze mode；If it is not, then executing the second anti-freeze mode；And first anti-freeze mode and the second anti-freeze mode be each configured to make water temperature or tube wall temperature in the pipe of water circulation pipe to reach preset temperature.In addition, the present invention also provides a kind of heat-pump water heaters using above-mentioned anti-freezing method.In heat-pump water heater and its anti-freezing method of the invention because when determining that water circulation pipe needs antifreeze, need to detect the water temperature in water tank, to select suitable anti-freeze mode when carrying out anti-freeze operation using the water in water tank, the anti-freeze loss of heat-pump water heater is significantly reduced.
Description
Technical Field
The invention relates to the field of heat pumps, in particular to a heat pump hot water device and an anti-freezing method thereof.
Background
The heat pump water heating device generally comprises an external unit, a water tank, a water circulation pipeline and a circulating pump, wherein the external unit mainly comprises a compressor, a heat exchanger, a throttling device, an evaporator and the like, and the working principle of the heat pump water heating device is that high-pressure high-temperature refrigerant gas generated by the working of the compressor enters the heat exchanger, is condensed and cooled, then enters the throttling device for throttling expansion, then enters the evaporator to absorb the heat of air and is evaporated into low-pressure steam, and the low-pressure refrigerant steam is sucked into the compressor and is compressed into high-temperature high-pressure gas again. The water circulation pipeline can be configured to introduce water in the water tank into the heat exchanger, and the water is heated by refrigerant in the heat exchanger and then is guided back to the water tank, so that cold water in the water tank is changed from low temperature to high temperature.
The outdoor unit of the heat pump water heating device is generally arranged outdoors, and when the outdoor environment is low, water flowing through the heat exchanger of the outdoor unit and water in the water circulation pipeline is easy to freeze, so that parts of the heat pump water heating device are frozen and cracked, and the popularization and the use of the heat pump water heating device are limited. The traditional heat pump hot water device has two main anti-freezing methods: the first is realized by a circulation pump, that is, when the outdoor air is below zero, the heat pump water heater operates the circulation pump and the outdoor unit. The second is realized by winding a heating cable outside the water circulation pipeline, namely, when the outdoor air is below zero degree, the heating cable is electrified. However, the conventional anti-freezing method causes the compressor of the outer machine to be started too frequently, or consumes much power and is not energy-saving.
Disclosure of Invention
An object of the first aspect of the present invention is to overcome at least one of the drawbacks of the existing freeze prevention methods for heat pump hot water apparatuses, and to provide a novel freeze prevention method for heat pump hot water apparatuses, which significantly reduces freeze prevention loss of the heat pump hot water apparatuses.
It is a further object of the first aspect of the present invention to reduce the frequency of compressor starts and to increase the life of the heat pump water heater.
An object of the second aspect of the invention is to provide a heat pump water heating device adopting the anti-freezing method.
According to a first aspect of the present invention, there is provided a method for preventing freezing of a heat pump hot water apparatus, the heat pump hot water apparatus including a heat exchanger, a water tank, and a water circulation line configured to introduce water in the water tank into the heat exchanger, heated by refrigerant in the heat exchanger, and then returned to the water tank; wherein the anti-freezing method comprises the following steps:
when the fact that the water circulation pipeline needs to be prevented from freezing is determined, detecting the water temperature in the water tank to obtain a first temperature detection value;
judging whether the first temperature detection value is smaller than a first preset value or not, and if so, executing a first anti-freezing mode; if not, executing a second anti-freezing mode; and is
The first anti-freezing mode and the second anti-freezing mode are both configured to enable the temperature of water in the pipe or the temperature of the pipe wall of the water circulation pipeline to reach a preset temperature.
Optionally, the first freeze prevention mode includes:
step A: entering a first-stage anti-freezing state, wherein in the first-stage anti-freezing state, the heat pump water heating device enables water in the heat pump water heating device to circularly flow in the water tank, the water circulation pipeline and the heat exchanger, and detects the temperature of water in the water circulation pipeline or the temperature of the pipe wall in real time to obtain a second temperature detection value;
and B: judging whether the second temperature detection value reaches the preset temperature or not, and if so, exiting the first anti-freezing mode; if not, entering the step C;
and C: judging whether water in the heat pump hot water device circularly flows for a preset time or not; if yes, entering the step D; if not, returning to the step A;
step D: entering a second-stage anti-freezing state, wherein in the second-stage anti-freezing state, the heat pump water heating device enables water in the heat pump water heating device to circularly flow in the water tank, the water circulation pipeline and the heat exchanger, the heat pump water heating device enables the heat exchanger to heat the water flowing through the heat exchanger, and the temperature of the water in the pipe or the temperature of the pipe wall of the water circulation pipeline is detected in real time to obtain a third temperature detection value;
step E: judging whether the third temperature detection value reaches the preset temperature or not, and if so, exiting the first anti-freezing mode; if not, returning to the step D.
Optionally, the second freeze prevention mode includes:
step A': entering a first-stage anti-freezing state, wherein in the first-stage anti-freezing state, the heat pump water heating device enables water in the heat pump water heating device to circularly flow in the water tank, the water circulation pipeline and the heat exchanger, and detects the temperature of water in the water circulation pipeline or the temperature of the wall of the water circulation pipeline in real time to obtain a fourth temperature detection value;
step B': judging whether the fourth temperature detection value reaches the preset temperature or not, and if so, exiting the second anti-freezing mode; if not, returning to the step A'.
Alternatively, the water of the heat pump water heating apparatus circulates in the water tank, the water circulation line and the heat exchanger such that the water flows from the lower portion of the water tank into the heat exchanger and then flows back to the middle or lower portion of the water tank.
Optionally, before the detecting the temperature of the water in the water tank, the method further comprises:
and detecting the temperature of water in the pipe or the temperature of the pipe wall of the water circulation pipeline in real time to obtain a fifth temperature detection value, and determining that the water circulation pipeline needs to be prevented from freezing when the fifth temperature detection value is smaller than a second preset value.
Optionally, the first preset value is 15 ℃ to 30 ℃; the second preset value is 0-6 ℃; the preset temperature is 6 ℃ to 15 ℃.
Optionally, the temperature of water in the pipe or the pipe wall temperature of the water circulation line is the pipe wall temperature of a pipe section of the water circulation line between the lower portion of the water tank and the water inlet side of the heat exchanger.
According to a second aspect of the present invention, there is provided a heat pump water heating apparatus, comprising a heat exchanger, a water tank, and a water circulation line, wherein the water circulation line is configured to introduce water in the water tank into the heat exchanger, and to guide the water back to the water tank after being heated by refrigerant in the heat exchanger; wherein the heat pump water heating apparatus is configured to: when the fact that the water circulation pipeline needs to be prevented from freezing is determined, detecting the water temperature in the water tank to obtain a first temperature detection value; when the first temperature detection value is smaller than a first preset value, a first anti-freezing mode is executed; when the first temperature detection value is greater than or equal to the first preset value, a second anti-freezing mode is executed; the first anti-freezing mode and the second anti-freezing mode are both configured to enable the temperature of water in the pipe or the temperature of the pipe wall of the water circulation pipeline to reach a preset temperature.
Optionally, the heat pump water heating apparatus further comprises: a circulation pump installed at a pipe section of the water circulation line between a lower portion of the water tank and a water inlet side of the heat exchanger, and configured to circulate water in the water tank, the water circulation line, and the heat exchanger.
Optionally, the pipe section of the water circulation pipeline between the water outlet side of the heat exchanger and the water tank comprises a water outlet main pipe section connected to the heat exchanger, a first water outlet branch pipe section connected to the upper part of the water tank and a second water outlet branch pipe section connected to the lower part of the water tank; and is
The water outlet main pipe section is communicated with the first water outlet branch pipe section and the second water outlet branch pipe section through a three-way valve, so that the water outlet main pipe section is communicated with the second water outlet branch pipe section when the heat pump hot water device executes the first anti-freezing mode or the second anti-freezing mode.
In the heat pump water heating device and the anti-freezing method thereof, when the water circulation pipeline is determined to need to be prevented from freezing, the water temperature in the water tank needs to be detected so as to execute the anti-freezing mode corresponding to the water temperature in the water tank, so that when the water in the water tank is used for freezing prevention operation, the proper anti-freezing mode is selected, and the anti-freezing loss of the heat pump water heating device is obviously reduced.
Furthermore, because the first-stage anti-freezing state is firstly carried out and then the second-stage anti-freezing state is carried out when the water temperature in the water tank is lower in the heat pump water heating device and the anti-freezing method thereof, the anti-freezing loss of the heat pump water heating device can be obviously reduced, and the starting frequency of the compressor is obviously reduced.
Further, according to the heat pump water heating device and the anti-freezing method thereof, only the first-stage anti-freezing state is performed when the water temperature in the water tank is high, so that the anti-freezing loss of the heat pump water heating device is remarkably reduced.
Furthermore, in the heat pump water heating device and the anti-freezing method thereof, whether the water circulation pipeline needs to be anti-frozen or not can be accurately known according to the temperature of water in the pipe or the temperature of the pipe wall of the water circulation pipeline.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic structural view of a heat pump water heating apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart diagram of a method of freeze prevention for a heat pump hot water unit according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of a method for preventing freezing of a heat pump hot water apparatus according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic configuration diagram of a heat pump water heating apparatus according to an embodiment of the present invention. As shown in fig. 1, an embodiment of the present invention provides a heat pump water heating apparatus. The heat pump water heating apparatus may generally include an outdoor unit, a water tank 21, a water circulation line 22, and a circulation pump 23. The outdoor unit may include a compressor 11, a heat exchanger 12, a throttle 13, and an evaporator 14, which are sequentially connected in a closed loop using refrigerant pipes. The water circulation line 22 is configured to introduce water from the tank 21 into the heat exchanger 12, to be heated by the refrigerant in the heat exchanger 12, and to return the heated water to the tank 21. Specifically, the water circulation line 22 may include: a water inlet pipe connected between the lower part of the tank 21 and the water inlet side of the heat exchanger 12; and a water outlet pipe connected between the water outlet side of the heat exchanger 12 and the tank 21. The circulation pump 23 may be installed at a pipe section of the water circulation line 22 between the lower portion of the water tank 21 and the water inlet side of the heat exchanger 12, that is, the circulation pump 23 may be installed at the water inlet pipe, and configured to circulate water in the water tank 21, the water circulation line 22, and the heat exchanger 12. The water tank 21 is configured to store hot water heated by the heat exchanger 12.
When the heat pump water heating apparatus operates to produce hot water, a high-temperature and high-pressure refrigerant discharged from the compressor 11 passes through the heat exchanger 12 to exchange heat with water in the heat exchanger 12 to heat the water, then passes through the pressure reduction and throttling of the throttling device 13, and then enters the evaporator 14 to absorb heat of an external heat source (such as air), and finally circulates back to the compressor 11. The circulation pump 23 is operated simultaneously with the compressor 11 to circulate the water of a lower temperature in the water tank 21 into the heat exchanger 12 to be heated and then to circulate the water back to the water tank 21 until the temperature of the water in the water tank 21 reaches a preset temperature. In the embodiment of the invention, carbon dioxide is preferably used as the refrigerant in the refrigerant pipe, so that the environment is not damaged. As known to those skilled in the art, the refrigerant in the refrigerant piping may also be conventional Freon working fluid, such as R22, R410A, R134A, etc.
In order to prevent the water in the water circulation line 22, the heat exchanger 12 and/or the circulation pump 23 from freezing when the heat pump water heating apparatus is in the standby state, the heat pump water heating apparatus of the embodiment of the present invention needs to perform the anti-freezing mode. Specifically, the heat pump water heating apparatus may be configured to: when the water circulation pipeline 22 is determined to need to be prevented from freezing, detecting the water temperature in the water tank 21 to obtain a first temperature detection value; when the first temperature detection value is smaller than a first preset value, a first anti-freezing mode is executed; and when the first temperature detection value is greater than or equal to the first preset value, executing a second anti-freezing mode. The first and second freeze prevention modes are both configured to allow the temperature of water in the pipe or the temperature of the pipe wall of the water circulation pipe 22 to reach a preset temperature. That is, the heat pump water heating apparatus may be configured to: when the water circulation pipeline 22 is determined to need to be prevented from freezing, detecting the water temperature in the water tank 21 to obtain a first temperature detection value; and an anti-freezing mode corresponding to the first temperature detection value is performed so that the temperature of water in the pipe or the pipe wall of the water circulation pipe 22 reaches a preset temperature, thereby preventing the water in the water circulation pipe 22, the heat exchanger 12, and the circulation pump 23 from freezing. When the heat pump water heating device is in an anti-freezing state by using water in the water tank 21, an anti-freezing mode which is suitable for the water temperature in the water tank 21 is selected, so that the anti-freezing loss of the heat pump water heating device is remarkably reduced. Further, the in-pipe water temperature or the pipe wall temperature of the water circulation pipe 22 preferentially uses the pipe wall temperature of a pipe section of the water circulation pipe 22 located between the lower portion of the tank 21 and the water inlet side of the heat exchanger 12, that is, the in-pipe water temperature or the pipe wall temperature of the water circulation pipe 22 is the pipe wall temperature of the water inlet pipe.
In some embodiments of the invention, a primary antifreeze state and a secondary antifreeze state can be preset in the heat pump water heating device. In the primary anti-freezing state, the heat pump water heating device enables water in the heat pump water heating device to circularly flow in the water tank 21, the water circulation pipeline 22 and the heat exchanger 12, and detects the temperature of water in the pipe or the temperature of the pipe wall of the water circulation pipeline 22 in real time. In the secondary anti-freezing state, the heat pump water heater enables water in the heat pump water heater to circularly flow in the water tank 21, the water circulation pipeline 22 and the heat exchanger 12, enables the heat exchanger 12 to heat water flowing through the heat exchanger 12, and detects the temperature of water in the pipe or the temperature of the pipe wall of the water circulation pipeline 22 in real time. The first freeze prevention mode may include: the first-stage anti-freezing state is entered first, and after the first-stage anti-freezing state is entered for a preset time, if the temperature of the water in the pipe or the temperature of the pipe wall of the water circulation pipeline 22 does not reach the preset temperature, the second-stage anti-freezing state is entered. The second anti-freeze mode includes entering only a primary freeze protection state. And in the first-stage antifreezing state and the second-stage antifreezing state, if the second temperature detection value reaches the preset temperature, the first-stage antifreezing state and the second-stage antifreezing state are exited, so that the heat pump hot water device exits the corresponding antifreezing mode.
In order to prevent the heat pump water heating apparatus from affecting the hot water in the upper portion of the water tank 21 when the first anti-freezing mode or the second anti-freezing mode is executed, in the embodiment of the present invention, the pipe section of the water circulation line 22 located between the water outlet side of the heat exchanger 12 and the water tank 21, that is, the water outlet pipe, includes a water outlet header section connected to the heat exchanger 12, a first water outlet branch section connected to the upper portion of the water tank 21, and a second water outlet branch section connected to the lower portion of the water tank 21. The water outlet main pipe section is communicated with the first water outlet branch pipe section and the second water outlet branch pipe section through the three-way valve 24, so that when the heat pump water heating device executes the first anti-freezing mode or the second anti-freezing mode, the water outlet main pipe section is communicated with the second water outlet branch pipe section, and therefore the water of the heat pump water heating device flows into the heat exchanger 12 from the lower part of the water tank 21 and then flows back to the middle part or the lower part of the water tank 21 in a circulating mode in the water tank 21, the water circulating pipeline 22 and the heat exchanger 12, and the influence of the circulating water on the hot water on the upper part of the water tank 21 can be prevented. The dotted arrows in fig. 1 may indicate the flow direction of water when the heat pump hot water apparatus performs the first anti-freeze mode or the second anti-freeze mode, and the solid arrows in fig. 1 may indicate the flow direction of water when the heat pump hot water apparatus produces hot water.
Fig. 2 is a schematic flow chart of a method for preventing freezing of a heat pump hot water apparatus according to an embodiment of the present invention. As shown in fig. 2, an embodiment of the present invention further provides an anti-freezing method for a heat pump hot water apparatus, which may include:
when it is determined that the water circulation line 22 needs to be protected from freezing, the temperature of water in the water tank 21 is detected, and a first temperature detection value is obtained. Specifically, the water temperature in the pipe or the pipe wall temperature of the water circulation pipe 22 may be detected in real time before the water temperature in the water tank 21 is detected, so as to obtain a fifth temperature detection value, and when the fifth temperature detection value is smaller than the second preset value, it is determined that the water circulation pipe 22 needs to be protected from freezing. The second preset value is 0 ℃ to 6 ℃. The temperature of the water in the tubes or the wall temperature of the water circulation line 22 may be the wall temperature of the tube section of the water circulation line 22 between the lower portion of the tank 21 and the water inlet side of the heat exchanger 12.
Judging whether the first temperature detection value is smaller than a first preset value or not, if so, executing a first anti-freezing mode; and if not, executing the second anti-freezing mode. The first and second freeze prevention modes are each configured to bring the temperature of water in the pipe or the temperature of the pipe wall of the water circulation line 22 to a preset temperature using water in the water tank 21, thereby preventing freezing in the heat exchanger 12, the water circulation line 22, and the circulation pump 23. The first preset value is 15 ℃ to 30 ℃, and the preset temperature is 6 ℃ to 15 ℃.
In some embodiments of the present invention, as shown in FIG. 3, the first freeze prevention mode includes:
step A: and entering a first-stage anti-freezing state, wherein the heat pump water heating device enables water in the heat pump water heating device to circularly flow in the water tank 21, the water circulation pipeline 22 and the heat exchanger 12, and detects the temperature of water in the pipe or the temperature of the pipe wall of the water circulation pipeline 22 in real time to obtain a second temperature detection value. The water can be circulated by turning on the circulation pump 23, that is, step a can be: and starting the circulating pump 23 and detecting the temperature of the water in the pipe or the temperature of the pipe wall of the water circulating pipeline 22 to obtain a second temperature detection value.
And B: judging whether the second temperature detection value reaches a preset temperature or not, and if so, exiting the first anti-freezing mode; if not, the step C is carried out. The first anti-freeze mode may be exited by turning off the circulation pump 23.
And C: judging whether water in the heat pump hot water device circularly flows for a preset time or not; if yes, entering the step D; if not, returning to the step A.
Step D: and entering a secondary anti-freezing state, wherein the heat pump water heating device enables water in the heat pump water heating device to circularly flow in the water tank 21, the water circulation pipeline 22 and the heat exchanger 12, the heat pump water heating device enables the heat exchanger 12 to heat the water flowing through the heat exchanger 12, and the temperature of the water in the pipe or the temperature of the pipe wall of the water circulation pipeline 22 is detected in real time to obtain a third temperature detection value. And D, entering the step C, not closing the circulating pump 23, and only starting the compressor 11 of the heat pump water heating device when a secondary anti-freezing state needs to be entered. That is, step D may be: the compressor 11 of the heat pump water heating apparatus is turned on.
Step E: judging whether the third temperature detection value reaches a preset temperature or not, and if so, exiting the first anti-freezing mode; if not, returning to the step D. In step E, the first anti-icing mode may be exited by turning off the circulation pump 23 and the compressor 11. In the embodiment of the present invention, the water of the heat pump hot water apparatus circulates in the water tank 21, the water circulation line 22 and the heat exchanger 12, and flows from the lower portion of the water tank 21 into the heat exchanger 12 and then flows back to the middle or lower portion of the water tank 21.
In some embodiments of the present invention, as shown in fig. 3, the second freeze prevention mode includes:
step A': and entering a first-stage anti-freezing state, wherein the heat pump water heating device enables water in the heat pump water heating device to circularly flow in the water tank 21, the water circulation pipeline 22 and the heat exchanger 12, and detects the temperature of water in the pipe or the temperature of the pipe wall of the water circulation pipeline 22 in real time to obtain a fourth temperature detection value.
Step B': judging whether the fourth temperature detection value reaches the preset temperature, if so, exiting the second anti-freezing mode; if not, returning to the step A'. In the embodiment of the present invention, the water of the heat pump hot water apparatus circulates in the water tank 21, the water circulation line 22 and the heat exchanger 12, and flows from the lower portion of the water tank 21 into the heat exchanger 12 and then flows back to the middle or lower portion of the water tank 21.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (8)
1. A method for preventing freezing of a heat pump water heating apparatus, the heat pump water heating apparatus comprising a heat exchanger, a water tank, and a water circulation line configured to introduce water in the water tank into the heat exchanger, heated by refrigerant in the heat exchanger, and then drained back to the water tank; wherein the anti-freezing method comprises the following steps:
when the fact that the water circulation pipeline needs to be prevented from freezing is determined, detecting the water temperature in the water tank to obtain a first temperature detection value;
judging whether the first temperature detection value is smaller than a first preset value or not, and if so, executing a first anti-freezing mode; if not, executing a second anti-freezing mode; and is
The first anti-freezing mode and the second anti-freezing mode are both configured to enable the temperature of water in the pipe or the temperature of the pipe wall of the water circulation pipeline to reach a preset temperature; wherein,
the first freeze prevention mode includes:
step A: entering a first-stage anti-freezing state, wherein in the first-stage anti-freezing state, the heat pump water heating device enables water in the heat pump water heating device to circularly flow in the water tank, the water circulation pipeline and the heat exchanger, and detects the temperature of water in the water circulation pipeline or the temperature of the pipe wall in real time to obtain a second temperature detection value;
and B: judging whether the second temperature detection value reaches the preset temperature or not, and if so, exiting the first anti-freezing mode; if not, entering the step C;
and C: judging whether water in the heat pump hot water device circularly flows for a preset time or not; if yes, entering the step D; if not, returning to the step A;
step D: entering a second-stage anti-freezing state, wherein in the second-stage anti-freezing state, the heat pump water heating device enables water in the heat pump water heating device to circularly flow in the water tank, the water circulation pipeline and the heat exchanger, the heat pump water heating device enables the heat exchanger to heat the water flowing through the heat exchanger, and the temperature of the water in the pipe or the temperature of the pipe wall of the water circulation pipeline is detected in real time to obtain a third temperature detection value;
step E: judging whether the third temperature detection value reaches the preset temperature or not, and if so, exiting the first anti-freezing mode; if not, returning to the step D;
the second freeze prevention mode includes:
step A': entering a first-stage anti-freezing state, wherein in the first-stage anti-freezing state, the heat pump water heating device enables water in the heat pump water heating device to circularly flow in the water tank, the water circulation pipeline and the heat exchanger, and detects the temperature of water in the water circulation pipeline or the temperature of the wall of the water circulation pipeline in real time to obtain a fourth temperature detection value;
step B': judging whether the fourth temperature detection value reaches the preset temperature or not, and if so, exiting the second anti-freezing mode; if not, returning to the step A'.
2. The freezing prevention method according to claim 1,
the water of the heat pump water heating device circulates in the water tank, the water circulation pipeline and the heat exchanger, and flows into the heat exchanger from the lower part of the water tank and then flows back to the middle or the lower part of the water tank.
3. The anti-freezing method according to claim 1, further comprising, before said detecting the temperature of water in said water tank:
and detecting the temperature of water in the pipe or the temperature of the pipe wall of the water circulation pipeline in real time to obtain a fifth temperature detection value, and determining that the water circulation pipeline needs to be prevented from freezing when the fifth temperature detection value is smaller than a second preset value.
4. The freezing prevention method according to claim 3,
the first preset value is 15 ℃ to 30 ℃;
the second preset value is 0-6 ℃;
the preset temperature is 6 ℃ to 15 ℃.
5. The freezing prevention method according to claim 1,
the temperature of water in the pipe or the temperature of the pipe wall of the water circulation pipeline is the temperature of the pipe wall of a pipe section of the water circulation pipeline, which is positioned between the lower part of the water tank and the water inlet side of the heat exchanger.
6. A heat pump water heating apparatus operating the freezing prevention method according to any one of claims 1 to 5, comprising a heat exchanger, a water tank, and a water circulation line configured to introduce water in the water tank into the heat exchanger, to be heated by refrigerant in the heat exchanger, and to be introduced back to the water tank; wherein the heat pump water heating apparatus is configured to:
when the fact that the water circulation pipeline needs to be prevented from freezing is determined, detecting the water temperature in the water tank to obtain a first temperature detection value; and is
When the first temperature detection value is smaller than a first preset value, a first anti-freezing mode is executed;
when the first temperature detection value is greater than or equal to the first preset value, a second anti-freezing mode is executed;
the first anti-freezing mode and the second anti-freezing mode are both configured to enable the temperature of water in the pipe or the temperature of the pipe wall of the water circulation pipeline to reach a preset temperature.
7. The heat pump water heating apparatus according to claim 6, further comprising:
a circulation pump installed at a pipe section of the water circulation line between a lower portion of the water tank and a water inlet side of the heat exchanger, and configured to circulate water in the water tank, the water circulation line, and the heat exchanger.
8. The heat pump water heating apparatus according to claim 7,
the pipe section of the water circulation pipeline between the water outlet side of the heat exchanger and the water tank comprises a water outlet main pipe section connected to the heat exchanger, a first water outlet branch pipe section connected to the upper part of the water tank and a second water outlet branch pipe section connected to the lower part of the water tank; and is
The water outlet main pipe section is communicated with the first water outlet branch pipe section and the second water outlet branch pipe section through a three-way valve, so that the water outlet main pipe section is communicated with the second water outlet branch pipe section when the heat pump hot water device executes the first anti-freezing mode or the second anti-freezing mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510240206.6A CN106288402B (en) | 2015-05-12 | 2015-05-12 | Heat-pump water heater and its anti-freezing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510240206.6A CN106288402B (en) | 2015-05-12 | 2015-05-12 | Heat-pump water heater and its anti-freezing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106288402A CN106288402A (en) | 2017-01-04 |
| CN106288402B true CN106288402B (en) | 2019-08-06 |
Family
ID=57630914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510240206.6A Active CN106288402B (en) | 2015-05-12 | 2015-05-12 | Heat-pump water heater and its anti-freezing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106288402B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018004158A (en) * | 2016-07-01 | 2018-01-11 | リンナイ株式会社 | Heat medium circulation device |
| CN106766219B (en) * | 2016-12-14 | 2019-09-20 | 珠海格力电器股份有限公司 | Anti-freezing control method, device and system for heat pump water machine |
| CN107388729A (en) * | 2017-07-28 | 2017-11-24 | 河南开元空分集团有限公司 | Comprehensively utilize the recirculated water energy-saving and cooling device and method of air separation unit cold energy |
| CN107842896A (en) * | 2017-11-30 | 2018-03-27 | 湖南埃瓦新能源科技有限公司 | A kind of low temperature environment heat pump with anti-frost protection and its antifreeze method |
| CN110440439A (en) * | 2019-08-09 | 2019-11-12 | 广东高而美制冷设备有限公司 | A kind of low temperature antifreeze control method of heat pump water dispenser system |
| CN113137746A (en) * | 2021-04-16 | 2021-07-20 | 广东长菱空调冷气机制造有限公司 | Control method of water way anti-freezing system of heat pump water heater |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004257583A (en) * | 2003-02-24 | 2004-09-16 | Matsushita Electric Ind Co Ltd | Storage water heater |
| EP1972858A2 (en) * | 2007-03-22 | 2008-09-24 | Sanden Corporation | Hot water supply apparatus |
| CN201740325U (en) * | 2010-08-20 | 2011-02-09 | 三河市同飞制冷设备有限公司 | Industrial chiller with anti-freezing function for refrigerating in winter |
| CN202149598U (en) * | 2011-06-17 | 2012-02-22 | 博浪热能科技有限公司 | Heat pump water heater for automatically preventing freezing |
| CN102449412A (en) * | 2009-05-26 | 2012-05-09 | 三菱电机株式会社 | Heat pump device |
| CN202757269U (en) * | 2012-07-31 | 2013-02-27 | 青岛经济技术开发区海尔热水器有限公司 | Two-stage anti-freezing gas water heater |
| CN204084847U (en) * | 2014-07-17 | 2015-01-07 | 张耀中 | Air energy heat pump low temperature winterization system |
| JP2015004494A (en) * | 2013-06-21 | 2015-01-08 | 株式会社デンソー | Water heater |
-
2015
- 2015-05-12 CN CN201510240206.6A patent/CN106288402B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004257583A (en) * | 2003-02-24 | 2004-09-16 | Matsushita Electric Ind Co Ltd | Storage water heater |
| EP1972858A2 (en) * | 2007-03-22 | 2008-09-24 | Sanden Corporation | Hot water supply apparatus |
| CN102449412A (en) * | 2009-05-26 | 2012-05-09 | 三菱电机株式会社 | Heat pump device |
| CN201740325U (en) * | 2010-08-20 | 2011-02-09 | 三河市同飞制冷设备有限公司 | Industrial chiller with anti-freezing function for refrigerating in winter |
| CN202149598U (en) * | 2011-06-17 | 2012-02-22 | 博浪热能科技有限公司 | Heat pump water heater for automatically preventing freezing |
| CN202757269U (en) * | 2012-07-31 | 2013-02-27 | 青岛经济技术开发区海尔热水器有限公司 | Two-stage anti-freezing gas water heater |
| JP2015004494A (en) * | 2013-06-21 | 2015-01-08 | 株式会社デンソー | Water heater |
| CN204084847U (en) * | 2014-07-17 | 2015-01-07 | 张耀中 | Air energy heat pump low temperature winterization system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106288402A (en) | 2017-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106288402B (en) | Heat-pump water heater and its anti-freezing method | |
| US9709308B2 (en) | Heat pump device and refrigerant bypass method | |
| US9897349B2 (en) | Refrigeration cycle device | |
| CN103250012B (en) | binary refrigeration cycle device | |
| CN110177983A (en) | Refrigerating plant with stop valve | |
| JP2017142039A (en) | Air conditioner | |
| US20110138839A1 (en) | Water circulation apparatus associated with refrigerant system | |
| KR101401909B1 (en) | Heat pump chiller system by non-frosting continuous operating the heat exchanger and Defrost method | |
| JP5185091B2 (en) | Heat pump hot water supply system | |
| CN103090603B (en) | Refrigerating circulatory device and hot water generating device | |
| EP2902727B1 (en) | Refrigeration cycle apparatus | |
| CN103307654B (en) | Heat pump type hot water heating system | |
| CN105402936A (en) | Air conditioner water heater and refrigerant leakage detecting method and device of air conditioner water heater | |
| CN203908148U (en) | Air conditioning system | |
| KR101324902B1 (en) | Method for cooling, heating and boiling using geothermal heat pump | |
| JP2017155944A (en) | Refrigeration cycle device and hot water heating device including the same | |
| WO2010131516A1 (en) | Hot-water supply system | |
| KR101157548B1 (en) | Heating and cooling apparatus using waste heat | |
| JP2009092321A (en) | Cooling/heating hot water supply system and its operating method | |
| KR20140097858A (en) | Heat pump | |
| JP2014031930A (en) | Refrigeration cycle device | |
| CN108105953A (en) | A kind of air-conditioner control system and its control method | |
| JP2017067397A (en) | Refrigerator | |
| KR20170055678A (en) | Heating system and method thereof | |
| JP2020165552A (en) | Heat pump type water heater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |