CN106979617B - Heat pump water heating device and control method thereof - Google Patents
Heat pump water heating device and control method thereof Download PDFInfo
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- CN106979617B CN106979617B CN201710338362.5A CN201710338362A CN106979617B CN 106979617 B CN106979617 B CN 106979617B CN 201710338362 A CN201710338362 A CN 201710338362A CN 106979617 B CN106979617 B CN 106979617B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 249
- 238000010438 heat treatment Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 claims description 32
- 239000003507 refrigerant Substances 0.000 description 34
- 239000007788 liquid Substances 0.000 description 20
- 239000008236 heating water Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
-
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The application relates to a heat pump water heating device and a control method thereof, wherein the heat pump water heating device comprises a heater (1) and a control component, the heater (1) comprises a container (13) for containing water, a first heat exchanger (12) and a second heat exchanger (14; 14 ') which are arranged in parallel, a water outlet (16) is arranged on the container (13), the first heat exchanger (12) is arranged at a position close to the water outlet (16), and the control component can control the first heat exchanger (12) and the second heat exchanger (14; 14') to independently work. The device can enable the unit to continuously exchange heat, and not only can heat the water continuously fed into the container in time, so that the hot water in the container can be effectively utilized; in addition, the hot water can be continuously provided in the using process, so that the using comfort is improved; in addition, the first heat exchanger is arranged at a position close to the water outlet and can rapidly heat water in a region near the water outlet, so that the heat exchange efficiency of the unit is improved, and the unit is more energy-saving.
Description
Technical Field
The application relates to the technical field of heat pump heating, in particular to a heat pump water heating device and a control method thereof.
Background
The heat pump water heater is a device for heating water at a user side by absorbing heat in a low-temperature heat source and converting compression work into high-temperature heat energy. Considering that air is convenient to be used as a low-temperature heat source, the air energy water heater is widely applied. The air energy water heater can heat domestic water by utilizing the heat pump principle, and the purpose of heating water is achieved by absorbing heat in the air.
The air energy water heater is a high-efficiency, energy-saving and environment-friendly heater product at present, but because of the particularity of the working principle of the air energy water heater, the water tank is in a continuous water supplementing state, namely, as long as the water outlet pipe flows out, the water inlet pipe is supplemented with water.
Thus, in the practical use process, the air energy water heater is found to have at least one of the following problems:
(1) In the water using process, the water temperature can be continuously reduced, namely, the water which is heated to the set temperature is continuously supplemented by the water tank, and the water outlet temperature is continuously reduced, so that the hot water in the water tank can not be effectively utilized.
(2) The unit is controlled to start and stop through the temperature sensing element, namely when the temperature of the discharged water is lower than a set value, the whole water tank starts to heat the water, at the moment, a water user in the water tank cannot use the water, the heating time is long, the continuous water use requirement of the user cannot be met, and the use comfort of the user is difficult to meet.
As can be seen, with the improvement of the quality of life of users, the demands for water heaters are increasing, and there is an urgent need to provide a water heater capable of continuously providing hot water with high efficiency and energy saving.
Disclosure of Invention
The application aims to provide a heat pump water heating device and a control method thereof, which can continuously provide hot water in the use process of a user.
To achieve the above object, a first aspect of the present application provides a heat pump water heating device, including a heater and a control unit, where the heater includes a container for containing water, a first heat exchanger and a second heat exchanger arranged in parallel, a water outlet is provided on the container, the first heat exchanger is provided at a position close to the water outlet, and the control unit can control the first heat exchanger and the second heat exchanger to work independently.
Further, the first heat exchanger is disposed within the vessel.
Further, the second heat exchanger is arranged on the outer wall of the container, or the second heat exchanger is arranged in the container.
Further, the first heat exchanger and the second heat exchanger are disposed at intervals of a preset distance along a length direction of the container.
Further comprises a compressor, an outdoor heat exchanger, a first valve and a second valve, wherein a first heat exchange branch and a second heat exchange branch which are connected in parallel are arranged between the outlet of the compressor and the outdoor heat exchanger,
the first heat exchanger and the first valve are arranged on the first heat exchange branch, and the first valve is used for controlling the on-off of the first heat exchange branch;
the second heat exchanger and the second valve are arranged on the second heat exchange branch, and the second valve is arranged on the second heat exchange branch and used for controlling the on-off of the second heat exchange branch.
Further, the control part can control the first heat exchanger and the second heat exchanger to work simultaneously under the conditions that the water outlet flow is zero and the water outlet temperature is lower than the preset temperature, and the water outlet flow is higher than the preset flow and the water outlet temperature is not higher than the preset temperature, and control the first heat exchanger to work independently under the conditions that the water outlet flow is lower than the preset flow and the water outlet temperature is lower than the preset temperature, and the water outlet flow is higher than the preset flow and the water outlet temperature is higher than the preset temperature.
Further, the device also comprises a detection component, wherein the detection component comprises a flow detection element and a first temperature sensing element, the flow detection element is arranged at a position close to the water outlet and is used for detecting the flow of water, the first temperature sensing element is arranged at a position close to the water outlet and is used for detecting the temperature of water discharged from the container, and the control component is used for controlling the first heat exchanger and the second heat exchanger to work according to the detection values of the flow detection element and the first temperature sensing element.
Further, the detection component further comprises a second temperature sensing element, the second temperature sensing element is arranged at a preset distance interval with the first temperature sensing element in the length direction of the container, and the control component is used for controlling the first heat exchanger and the second heat exchanger to work according to detection values of the flow detection element, the first temperature sensing element and the second temperature sensing element.
Further, the heat pump water heater is an air energy water heater.
To achieve the above object, a second aspect of the present application provides a control method for a heat pump water heating device according to the above embodiment, including:
judging whether the outlet water temperature is lower than a preset temperature under the condition that the outlet water flow is detected to be zero, if so, controlling the first heat exchanger and the second heat exchanger to work simultaneously by the control part, otherwise, controlling the first heat exchanger and the second heat exchanger to stop working;
judging whether the outlet water temperature is smaller than the preset temperature under the condition that the outlet water flow is smaller than the preset flow, if so, controlling the first heat exchanger to work independently by the control part, otherwise, controlling the first heat exchanger and the second heat exchanger to stop working;
and under the condition that the water outlet flow is not smaller than the preset flow, judging whether the water outlet temperature is higher than the preset temperature, if so, controlling the first heat exchanger to work independently by the control part, and otherwise, controlling the first heat exchanger and the second heat exchanger to work simultaneously.
Further, when the water outlet flow rate is detected to be zero, the method further comprises the following steps of:
judging whether the water temperature at the position, which is spaced from the water outlet by a preset distance in the length direction, in the container is smaller than a preset temperature, if the water temperature at the position, which is spaced from the water outlet by the preset distance, in the container is smaller than the preset temperature, the control part controls the first heat exchanger and the second heat exchanger to work simultaneously, otherwise, controls the first heat exchanger and the second heat exchanger to stop working.
Based on the technical scheme, the first heat exchanger and the second heat exchanger are arranged in parallel in the heater, and the control part can control the first heat exchanger and the second heat exchanger to work independently in the working process of the heat pump water heating device so as to adjust the heating state according to the heating requirement, so that the unit can continuously exchange heat, and not only can the water continuously fed into the container be heated in time, but also the hot water in the container can be effectively utilized; the continuous supply of hot water in the use process of the user can be ensured, so that the continuous water use requirement of the user can be met, and the use comfort is improved; in addition, the first heat exchanger is arranged at a position close to the water outlet and can rapidly heat water in a region near the water outlet, so that the heat exchange efficiency of the unit is improved, and the unit is more energy-saving.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:
FIG. 1 is a schematic view of the structural principle of an embodiment of a heat pump water heating device of the present application;
fig. 2 is a schematic structural diagram of another embodiment of the heat pump water heating device of the present application.
Description of the reference numerals
1. A heater; 2. a blower; 3. an outdoor heat exchanger; 4. a compressor; 5. a gas-liquid separator; 6. a reversing valve; 7. a first valve; 8. a second valve; 9. a throttle element; 11. a housing; 12. a first heat exchanger; 13. a container; 14/14', a second heat exchanger; 15. a flow rate detection element; 16. a water outlet; 17. a first temperature sensing element; 18. a second temperature sensing element; 19. and a water inlet.
Detailed Description
The present application is described in detail below. In the following paragraphs, the different aspects of the embodiments are defined in more detail. Aspects so defined may be combined with any other aspect or aspects unless explicitly stated to be non-combinable. In particular, any feature or features may be viewed as being preferred or advantageous with respect to one or more other features.
The terms "first," "second," and the like in the present application are merely for convenience of description to distinguish between different constituent components having the same name, and do not denote a sequential or primary or secondary relationship.
The application firstly provides a heat pump water heating device which can be used for heating water by a user side by absorbing heat in a low-temperature heat source and converting compression work into high-temperature heat energy. Referring to fig. 1 and 2, the heat pump water heating apparatus includes, in order along a refrigerant flow path in a main circulation circuit: a compressor 4, a heater 1, a throttling element 9, an outdoor heat exchanger 3, a reversing valve 6 and a gas-liquid separator 5. Wherein the outdoor heat exchanger 3 serves as an evaporator for absorbing heat in a low-temperature heat source; the heater 1 is located at the user end and is used for containing water and heating the water through an internal heat exchanger, the internal heat exchanger of the heater 1 is used as a condenser, and the water is heated through condensation heat release.
The heat pump water heating device works according to the following principle: after the compressor 4 is started, the liquid refrigerant flowing through the outdoor heat exchanger 3 exchanges heat with the outside through the temperature difference between the inside and the outside, the liquid refrigerant absorbs heat in the evaporation process and is converted into a low-temperature low-pressure gaseous refrigerant, the low-temperature low-pressure gaseous refrigerant passes through the reversing valve 6 and the gas-liquid separator 5 and then enters the compressor 4 to be compressed, the gaseous refrigerant converted into high-temperature high-pressure gaseous refrigerant flows into the heat exchanger in the heater 1 to exchange heat with water stored in the heater 1, the temperature of the water in the process is increased, meanwhile, the gaseous refrigerant is converted into the liquid refrigerant, and the liquid refrigerant is throttled and depressurized by the throttling element 9 and then is further converted into a gas-liquid two-phase refrigerant and then is further supplied to the outdoor heat exchanger 3, and thus one cycle is completed.
In an exemplary embodiment, as shown in fig. 1 and 2, the heater 1 in the heat pump water heating apparatus includes a container 13 for holding water, a first heat exchanger 12, and a second heat exchanger, which is a part 14 in fig. 1 or a part 14' in fig. 2. The container 13 is provided with a water inlet 19 and a water outlet 16, the water inlet 19 is used for leading cold water into the container 13, and the water outlet 16 is used for leading hot water in the container 13 out. For a cylindrical container 13, the water inlet 19 and the water outlet 16 may be provided at positions on the container 13 near both ends in the length direction, respectively. The first heat exchanger 12 is arranged near the water outlet 16, and the first heat exchanger 12 and the second heat exchanger are arranged in parallel. The water in the container 13 may here be domestic water or another liquid to be heated.
The heat pump water heating device further comprises a control component, wherein the control component can control the first heat exchanger 12 and the second heat exchanger to work independently, so that the first heat exchanger 12 and the second heater can be switched into different working modes according to heating requirements to heat water in the container 13. Alternative modes of operation include the first heat exchanger 12 and the second heat exchanger operating simultaneously, the first heat exchanger 12 operating alone, and neither the first heat exchanger 12 nor the second heat exchanger operating. When the first heat exchanger 12 works alone, the refrigerant flowing in the heat pump water heating device is intensively supplied to the first heat exchanger 12, so that water in the area near the water outlet 16 can be heated quickly and efficiently.
The first heat exchanger 12 and the second heat exchanger are arranged in parallel, and each heat exchanger is provided with an independent refrigerant inlet and an independent refrigerant outlet, for example, when the heat pump water heating device heats water, a port A of the first heat exchanger 12 is used as the refrigerant inlet, a port B is used as the refrigerant outlet, a port C of the second heat exchanger is used as the refrigerant inlet, and a port D is used as the refrigerant outlet.
The heat pump water heating device can enable the first heat exchanger 12 and the second heat exchanger to be independently and separately heated, and the work of the two heat exchangers is not affected, so that different working modes can be flexibly selected according to heating requirements. When the heat pump water heating device heats water, the heating state can be adjusted through switching of different working modes, so that the unit can continuously exchange heat, and the water continuously fed into the container can be heated in time, so that the hot water in the container reaching the preset temperature can be effectively utilized; and can also guarantee to continuously provide hot water in the user's use to satisfy the demand of user's continuous water, improve the use travelling comfort. Meanwhile, the first heat exchanger 12 is arranged at a position close to the water outlet 16, so that water in a region near the water outlet 16 can be quickly heated, the heating region is small, the purpose of quickly improving the water outlet temperature is achieved, the heat exchange efficiency of a unit is improved, the unit is more energy-saving, and further the heat pump water heating device can continuously provide hot water in an efficient and energy-saving mode.
Preferably, the first heat exchanger 12 is arranged inside the container 13, so that water in the container 13 can be directly heated, and the heat exchange efficiency and energy conservation of the unit can be improved. In addition, the first heat exchanger 12 may be provided on the outer wall of the vessel 13 near the outlet to indirectly heat the water in the vessel 13 through the outer wall of the vessel 13.
Further, the second heat exchanger has two arrangements. As shown in fig. 1, the second heat exchanger 14 is provided on the outer wall of the container 13, for example, a heat exchange tube is wound around the outer wall of the container 13 to heat the water inside through the outer wall of the container 13. As shown in fig. 2, the second heat exchanger 14' is provided in the container 13 to directly heat the water in the container 13, and the heating efficiency of the unit can be improved by direct heat exchange.
The first heat exchanger 12 and the second heat exchanger are arranged at intervals of a preset distance along the length direction of the container 13, so that the heating area of the heat exchangers can cover a larger range as much as possible, and the uniformity of the water temperature in the container 13 is improved.
In practical design, the first heat exchanger 12 may be considered as an auxiliary heat exchanger and the second heat exchanger as a main heat exchanger from a power point of view. Because the first heat exchanger 12 is arranged at a position close to the water outlet 16, water in the area near the water outlet 16 can be quickly heated to meet the requirement of users on the water outlet temperature, and therefore, the first heat exchanger 12 can obtain quick temperature response by setting smaller power. Even if the first heat exchanger 12 is kept in an open state to continuously heat water during water use, the energy consumption of the whole unit is not greatly influenced, which provides a condition for users to continuously use hot water. Only when the water outlet flow is large and the water temperature in the container 13 is low, the first heat exchanger 12 and the second heat exchanger are simultaneously opened to jointly heat, and the second heat exchanger plays a main heating role.
Still referring to fig. 1 and 2, a first heat exchange branch and a second heat exchange branch are provided in parallel between the outlet of the compressor 4 and the outdoor heat exchanger 3, the first heat exchanger 12 being provided on the first heat exchange branch, the second heat exchanger being provided on the second heat exchange branch. If a throttling element 9 is provided, the first heat exchange branch and the second heat exchange branch are arranged in parallel between the outlet of the compressor 4 and the throttling element 9.
To operate a particular heat exchanger, the corresponding heat exchange branch of the heat exchanger needs to be connected. For this purpose, the heat pump water heating device further comprises a first valve 7 and a second valve 8, wherein the first valve 7 is arranged on the first heat exchange branch path and is used for controlling the on-off of the first heat exchange branch path, and the second valve 8 is arranged on the second heat exchange branch path and is used for controlling the on-off of the second heat exchange branch path. Preferably, the first valve 7 and the second valve 8 can be electromagnetic valves, and the on-off of the electromagnetic valves can be controlled by a control component in the working process so as to flexibly control the heating modes of the first heat exchanger and the second heat exchanger. Alternatively, the first valve 7 and the second valve 8 may also be manual valves.
In order to be able to control the operating conditions of the first valve 7 and the second valve 8, it is necessary to detect a condition parameter of the water in the container 13. The heat pump water heating device of the present application further comprises a detection means comprising a flow detection element 15 and a first temperature sensing element 17, as shown in fig. 1 and 2. The flow detection element 15 is disposed near the water outlet 16, and is used for detecting the water flow in real time. The first temperature sensing element 17 is disposed near the water outlet 16, and is used for detecting the water temperature in the area near the water outlet 16 in real time, and sending the detected water temperature to the control part. The control part is connected with the detection part and is used for controlling the first valve 7 and the second valve 8 to be switched on or off according to the detection values of the flow detection element 15 and the first temperature sensing element 17 so as to select the heating modes of the first heat exchanger 12 and the second heat exchanger.
Further, the detecting means further includes a second temperature sensing element 18, the second temperature sensing element 18 being disposed at a predetermined distance interval from the first temperature sensing element 17 in the longitudinal direction of the container 13. In the heat pump water heating device in which the tank 13 is vertically arranged, the second temperature sensing element 18 is provided in a lower region of the tank 13 in the height direction. Preferably, the second temperature sensing element 18 is arranged close to the water inlet 19.
The two temperature sensing elements are arranged at intervals to detect the water temperatures in different areas in the container 13, and the current water temperature in the container 13 can be reflected more comprehensively and accurately in a multipoint detection mode. The control part can control the first valve 7 and the second valve 8 to be switched on or off according to the detection values of the flow detection element 15, the first temperature sensing element 17 and the second temperature sensing element 18 at the same time so as to select the heating modes of the first heat exchanger 12 and the second heat exchanger, thereby enabling the unit to provide hot water more stably and improving the use comfort of users.
The heat pump water heating device of the above embodiment may be an air energy heater. The air energy heater takes air as a low-temperature heat source, achieves the aim of heating water in the container 13 by absorbing heat in the air, and is further provided with a fan 2 near the outdoor heat exchanger 3 for enhancing the heat exchange effect of the outdoor heat exchanger 3 so as to increase the heat exchange efficiency of the refrigerant and the air in the outdoor heat exchanger 3 by promoting the air flow. In addition, the heat pump water heating device can also utilize heat sources such as groundwater, industrial waste heat and the like.
In addition, the application also provides a control method of the heat pump water heating device based on the embodiment. In one embodiment, the heat pump water heating device comprises a flow detection element 15 and a first temperature sensing element 17 arranged at the water outlet 16, and the control method thereof comprises the following steps:
(1) When the flow rate detection element 15 detects that the water flow rate is zero (q=0), the water temperature (T 1 ) Whether or not it is less than a preset temperature (T 0 ) If it is (T) 1 <T 0 ) The control means control the first heat exchanger 12 and the second heat exchanger to operate simultaneously, otherwise (T 1 ≥T 0 ) Controlling the first heat exchanger 12 and the second heat exchanger to stop working;
(2) In the case where the flow rate detection element 15 detects that the outflow rate is smaller than the preset flow rate (Q<Q 0 ) The outlet water temperature (T 1 ) Whether or not it is less than a preset temperature (T 0 ) If it is (T) 1 <T 0 ) The control means control the first heat exchanger 12 to operate alone, otherwise (T 1 ≥T 0 ) Controlling the first heat exchanger 12 and the second heat exchanger to stop working;
(3) Under the condition that the flow rate of the water outlet detected by the flow rate detecting element 15 is not less than the preset flow rate (Q is more than or equal to Q) 0 ) The outlet water temperature (T 1 ) Whether or not it is higher than a preset temperature (T 0 ) If it is (T) 1 >T 0 ) The control means control the first heat exchanger 12 to operate alone, otherwise (T 1 ≤T 0 ) The first heat exchanger 12 and the second heat exchanger are controlled to operate simultaneously.
In another embodiment, the heat pump water heating apparatus includes a flow rate detecting element 15 and a first temperature sensing element 17 provided at a water outlet 16, and a second temperature sensing element 18 provided at a predetermined distance from the first temperature sensing element 17 in the longitudinal direction of the container 13. Accordingly, when the water flow rate is detected to be zero in the step (1), the step of determining the water temperature detected by the first temperature sensing element 17 includes the following steps:
judging the water temperature (T) in the container 13 detected by the second temperature sensing element 18 at a predetermined distance from the water outlet 16 in the longitudinal direction 2 ) Whether or not the water temperature detected by the first temperature sensing element 17 and the second temperature sensing element 18 is less than the preset temperature (T 1 <T 0 And T is 2 <T 0 ) The control part controls the first heat exchanger 12 and the second heat exchanger to work simultaneously, otherwise controls the first heat exchanger 12 and the second heat exchanger to stop working.
In the above steps, the judging of the relationship between the water flow and the preset flow and the relationship between the current water temperature and the preset water temperature may also be performed by the control part.
In the working process of the heat pump water heating device, the control part selects the working modes of the heat exchangers according to the water temperatures of two different areas in the container 13 at the same time, and can comprehensively and accurately obtain the current water temperature in the container 13, so that the unit can provide hot water more stably, and the use comfort of a user is improved.
The first heat exchanger 12 and the second heat exchanger are arranged in parallel, and can independently heat under the control of the control component, and the work of the two heat exchangers is not affected, so that a foundation is provided for selecting different heating modes under different water outlet flows and water temperatures. The control method of the heat pump water heating device can enable the unit to continuously exchange heat, and not only can heat the water continuously fed into the container in time, but also can enable the hot water in the container reaching the preset temperature to be effectively utilized; and can also guarantee to continuously provide hot water in the user's use to satisfy the demand of user's continuous water, improve the use travelling comfort. In addition, the first heat exchanger 12 is arranged at a position close to the water outlet 16, so that water in the area near the water outlet 16 can be quickly heated, and conditions are provided for continuous heat exchange of the unit in the working process.
In order to make the operation of the heat pump water heating apparatus of the present application more clearly understood by those skilled in the art, the operation of the heat pump water heating apparatus shown in fig. 1 will be described by way of example. In fig. 1, the container 13 is used for containing water, and cold water enters the container 13 from the water inlet 19 and flows out from the water outlet 16 after being heated. Except for the pipelines connected with the water inlet 19 and the water outlet 16, the other pipelines in the device are all refrigerant.
The flow detection element 15 is used for detecting the flow of water, the first temperature sensing element 17 is used for detecting the water temperature near the water outlet 16 in the container 13, and the second temperature sensing element 18 is used for detecting the water temperature at a preset distance from the first temperature sensing element 17 in the length direction in the container 13. The detection part sends the water outlet flow and water temperature signals to the control part.
The operation modes of the first heat exchanger 12 and the second heat exchanger 14 at different water outlet flows and water temperatures are given above in the subject matter of the control method, and the operation principle in each mode will be given below with emphasis.
In case the first heat exchanger 12 and the second heat exchanger 14 are operated simultaneously, the control means simultaneously opens the first valve 7 and the second valve 8. After the compressor 4 is started, the high-temperature high-pressure gaseous refrigerant discharged from the outlet of the compressor 4 is divided into two paths, one path of gaseous refrigerant enters the first heat exchanger 12 from the port A, condenses and releases heat in the first heat exchanger 12, heats water in the container 13, then turns into liquid refrigerant, flows out from the port B and flows through the first valve 7; simultaneously, the other path of gaseous refrigerant enters the port (1) of the reversing valve 6 through the second valve 8, flows out from the port (4) communicated with the port (1), enters the second heat exchanger 14 from the port C, condenses and releases heat in the second heat exchanger 14, heats water in the container 13, and then turns into liquid refrigerant to flow out from the port D.
The liquid refrigerants flowing out from the first heat exchanger 12 and the second heat exchanger 14 are converged, then are throttled by a throttling element 9 such as an electronic expansion valve or a capillary tube, and then become a gas-liquid two-phase state, enter the outdoor heat exchanger 3, the gas-liquid two-phase refrigerant absorbs heat in the air in the flowing process of the outdoor heat exchanger 3 and becomes a gas state, the gas-liquid two-phase refrigerant enters the gas-liquid separator 5 after passing through a port (2) of the reversing valve 6 and a port (3) communicated with the port (2), and the separated gas refrigerant is sucked from an inlet of the compressor 4 to complete one cycle.
In the case of a single operation of the first heat exchanger 12, the control part opens the first valve 7 and closes the second valve 8. After the compressor 4 is started, the high-temperature and high-pressure gaseous refrigerant discharged from the outlet of the compressor 4 enters the first heat exchanger 12 from the port A, is condensed and releases heat in the first heat exchanger 12, heats water in the area close to the water outlet 16 in the container 13, becomes liquid refrigerant, flows out from the port B, flows through the first valve 7, is throttled by the throttling element 9, becomes a gas-liquid two-phase state, enters the outdoor heat exchanger 3, becomes a gas state after absorbing air heat in the flowing process of the gas-liquid two-phase refrigerant in the outdoor heat exchanger 3, enters the gas-liquid separator 5 after passing through the port (2) of the reversing valve 6 and the port (3) communicated with the port (2), and the separated gaseous refrigerant is sucked from the inlet of the compressor 4 to complete a cycle. After the second valve 8 is closed, the refrigerant cannot enter the second heat exchanger 14 to heat.
In the case where neither the first heat exchanger 12 nor the second heat exchanger 14 is operated, the control unit simultaneously closes the first valve 7 and the second valve 8, and at this time, the compressor 4 can also be controlled to stop operating.
The heat pump water heating device and the control method thereof provided by the application are described in detail. The principles and embodiments of the present application have been described herein with reference to specific examples, which are intended to be merely illustrative of the methods of the present application and their core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the application can be made without departing from the principles of the application and these modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
Claims (10)
1. The heat pump water heating device is characterized by comprising a heater (1) and a control component, wherein the heater (1) comprises a container (13) for containing water, a first heat exchanger (12) and a second heat exchanger (14; 14 ') which are arranged in parallel, the first heat exchanger (12) with smaller power is used as an auxiliary heat exchanger, the second heat exchanger (14; 14 ') with larger power is used as a main heat exchanger, a water outlet (16) is arranged on the container (13), the first heat exchanger (12) is arranged at a position close to the water outlet (16), and the control component can control the first heat exchanger (12) and the second heat exchanger (14; 14 ') to work independently;
the control part can control the first heat exchanger (12) and the second heat exchanger (14; 14') to work simultaneously under the condition that the water outlet flow is zero and the water outlet temperature is lower than the preset temperature, and the water outlet flow is higher than the preset flow and the water outlet temperature is not higher than the preset temperature, and control the first heat exchanger (12) to work independently under the condition that the water outlet flow is lower than the preset flow and the water outlet temperature is lower than the preset temperature, and the water outlet flow is higher than the preset flow and the water outlet temperature is higher than the preset temperature.
2. Heat pump water heating device according to claim 1, characterized in that the first heat exchanger (12) is provided in the container (13).
3. Heat pump water heating device according to claim 1, characterized in that the second heat exchanger is provided on the outer wall of the container (13) or in that the second heat exchanger is provided inside the container (13).
4. Heat pump water heating device according to claim 1, characterized in that the first heat exchanger (12) and the second heat exchanger (14; 14') are arranged at predetermined distance intervals along the length of the container (13).
5. The heat pump water heating device according to claim 1, further comprising a compressor (4), an outdoor heat exchanger (3), a first valve (7) and a second valve (8), a first heat exchanging branch and a second heat exchanging branch being arranged in parallel between the outlet of the compressor (4) and the outdoor heat exchanger (3),
the first heat exchanger (12) and the first valve (7) are arranged on the first heat exchange branch, and the first valve (7) is used for controlling the on-off of the first heat exchange branch;
the second heat exchanger (14; 14') and the second valve (8) are arranged on the second heat exchange branch, and the second valve (8) is arranged on the second heat exchange branch and used for controlling the on-off of the second heat exchange branch.
6. Heat pump water heating device according to claim 1, further comprising a detection means comprising a flow detection element (15) and a first temperature sensing element (17), the flow detection element (15) being arranged close to the water outlet (16) for detecting the flow of water, the first temperature sensing element (17) being arranged close to the water outlet (16) for detecting the temperature of the water leaving the container (13), the control means being arranged to control the operation of the first heat exchanger (12) and the second heat exchanger (14; 14') in dependence of the detection values of the flow detection element (15) and the first temperature sensing element (17).
7. Heat pump water heating device according to claim 6, characterized in that the detection means further comprise a second temperature sensing element (18), the second temperature sensing element (18) being arranged at a predetermined distance from the first temperature sensing element (17) in the length direction of the container (13), the control means being adapted to control the operation of the first heat exchanger (12) and the second heat exchanger (14; 14') depending on the detection values of the flow detection element (15), the first temperature sensing element (17) and the second temperature sensing element (18).
8. The heat pump water heater as claimed in any one of claims 1 to 7, wherein the heat pump water heater is an air energy water heater.
9. A control method based on the heat pump water heating apparatus according to any one of claims 1 to 8, characterized by comprising:
under the condition that the water outlet flow is detected to be zero, judging whether the water outlet temperature is smaller than a preset temperature, if so, controlling the first heat exchanger (12) and the second heat exchanger (14; 14 ') to work simultaneously by the control part, otherwise, controlling the first heat exchanger (12) and the second heat exchanger (14; 14') to stop working;
judging whether the outlet water temperature is smaller than the preset temperature under the condition that the outlet water flow is smaller than the preset flow, if so, controlling the first heat exchanger (12) to work independently by the control part, otherwise, controlling the first heat exchanger (12) and the second heat exchanger (14; 14') to stop working;
and under the condition that the water outlet flow is not smaller than the preset flow, judging whether the water outlet temperature is higher than the preset temperature, if so, controlling the first heat exchanger (12) to work independently by the control component, and otherwise, controlling the first heat exchanger (12) and the second heat exchanger (14; 14') to work simultaneously.
10. The control method of a heat pump water heating apparatus according to claim 9, wherein when the detected water outlet flow rate is zero, the control method further comprises:
judging whether the water temperature at the preset distance from the water outlet (16) in the length direction in the container (13) is smaller than the preset temperature, if the water temperature at the preset distance from the water outlet (16) in the container (13) is smaller than the preset temperature, controlling the first heat exchanger (12) and the second heat exchanger (14; 14 ') to work simultaneously by the control part, otherwise, controlling the first heat exchanger (12) and the second heat exchanger (14; 14') to stop working.
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| CN201710338362.5A CN106979617B (en) | 2017-05-15 | 2017-05-15 | Heat pump water heating device and control method thereof |
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| CN201710338362.5A CN106979617B (en) | 2017-05-15 | 2017-05-15 | Heat pump water heating device and control method thereof |
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| CN112631345A (en) * | 2019-10-08 | 2021-04-09 | 芜湖美的厨卫电器制造有限公司 | Water temperature control device and method and wall-mounted boiler |
| CN112033003A (en) * | 2020-08-25 | 2020-12-04 | 青岛海尔新能源电器有限公司 | Control method of heat pump water heater |
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