CN113237227B - Heat pump water heater and defrosting operation control method thereof - Google Patents
Heat pump water heater and defrosting operation control method thereof Download PDFInfo
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- CN113237227B CN113237227B CN202110343716.1A CN202110343716A CN113237227B CN 113237227 B CN113237227 B CN 113237227B CN 202110343716 A CN202110343716 A CN 202110343716A CN 113237227 B CN113237227 B CN 113237227B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H4/00—Fluid heaters characterised by the use of heat pumps
- F24H4/02—Water heaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- 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
- F25B47/022—Defrosting cycles hot gas defrosting
- F25B47/025—Defrosting cycles hot gas defrosting by reversing the cycle
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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
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention relates to a defrosting operation control method of a water heater, wherein the water heater comprises a heat exchange loop and a control system; the heat exchange loop comprises a compressor for providing pressure, a first water storage tank, a second water storage tank, a pipeline for connecting the compressor, the heat exchanger and the water storage tanks together, and control valve groups arranged at all positions of the pipeline; the control system comprises a temperature detector and a central control unit which are arranged in the water storage tank, wherein the central control unit can adjust the control valve group according to temperature data transmitted by the temperature detector, so that the first water storage tank and the second water storage tank are connected in parallel/in series/separately in the heat exchange loop; the water heater comprises a heat exchanger, a compressor for providing pressure, a first water storage tank, a second water storage tank, a temperature detector arranged in the water storage tanks, a control valve group for adjusting hot water flow direction and a central control unit for adjusting the control valve group; according to the scheme, the heat exchange unit of which water tank is connected into the heat exchange loop is judged according to the water consumption condition of a user and the temperature condition of hot water in the two water tanks during defrosting, so that the defrosting is efficient under the condition that the user and the normal defrosting process are not influenced.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to a heat pump water heater and a defrosting operation control method thereof.
Background
The existing heat pump water heater mostly adopts a heat pump host machine to heat a single water tank, the heating period of heating all water in the water storage tank in the operation process of the heat pump unit is long, and the heating period can not be shortened when the emergency hot water is required. The heat pump water heater is a new type of water heating device. Compared with the traditional solar water heater, the heat pump water heater can not only utilize partial solar energy, but also absorb the heat in the air for heating. Specifically, the heat pump water heater absorbs heat through the temperature difference of the refrigerant and compresses and heats the compressor, and then exchanges heat with water to prepare hot water. The heat pump water heater can make full use of new energy and has the advantage of high thermal efficiency.
The hot water condition of user's use can often be met to the in-process of water heater at regular defrosting, because in the defrosting process, the hot water heat in the storage tank is often called in the defrosting, can lead to the user to use hot water temperature to become low, influences user's use and experiences.
Disclosure of Invention
The invention aims to provide a heat pump water heater capable of flexibly controlling defrosting according to the temperature of a water tank and the using condition of a user and a defrosting operation control method thereof.
The invention adopts the following technical scheme: a defrosting operation control method for a water heater comprises a heat exchange loop and a control system; the heat exchange loop comprises a compressor for providing pressure, a four-way reversing valve, a first water storage tank, a second water storage tank, a pipeline for connecting the compressor, the heat exchanger and the water storage tanks together, and control valve groups arranged at each position of the pipeline; the control system comprises a central control unit and a temperature detector arranged in the water storage tank, wherein the central control unit can adjust the control valve group according to temperature data transmitted by the temperature detector, so that the first water storage tank and the second water storage tank are connected in parallel/in series/separately connected into the heat exchange loop; the defrosting operation control method of the water heater comprises the following steps:
starting a program, and enabling the water heater to normally operate;
judging whether the water heater meets the defrosting condition;
if the water heater meets the defrosting condition, judging whether hot water is used; and is
If the hot water is used, the hot water is provided for the user from the water tank with higher temperature;
if the hot water is not used, detecting the hot water temperatures T5 and T6 in the first water storage tank and the second water storage tank; and judging whether T5 and T6 are both larger than a temperature threshold value a;
if not, absorbing heat from the two water tanks simultaneously, and entering defrosting operation;
and if so, defrosting according to the relationship between the hot water temperature of the two water tanks and a preset temperature threshold value a. This scheme is through when the defrosting according to user's water condition and the hydrothermal temperature condition in two water tanks, during judging which water tank links into heat transfer circuit, realizes the high-efficient of defrosting under the condition that does not influence user and the normal process of defrosting.
Further, the following steps are included when judging whether the water heater meets the defrosting condition:
judging whether the water heater meets the defrosting condition;
if the water heater does not meet the defrosting condition, the water heater operates normally;
if the water heater does not meet the defrosting condition, the central control unit adjusts the four-way reversing valve to enable the compressor to be reversely connected into the heat exchange loop. The judgment standard for determining whether the water heater normally operates or enters the defrosting mode is that whether the water heater meets defrosting conditions, the specific defrosting conditions comprise a plurality of conditions such as temperature, pressure and the like, whether the water heater enters the defrosting mode is judged according to the conditions, after the water heater enters the defrosting mode, the central control unit controls the four-way reversing valve to enable the compressor to be reversely connected into the heat exchange loop, and meanwhile, the compressor is started to press a refrigerant in the heat exchange unit into the outdoor heat exchanger, so that the outdoor heat exchanger is defrosted.
Further, when hot water is judged to be used, the process of selecting the low-temperature water storage tank for defrosting comprises the following steps:
if so, judging the hot water temperature T5 of the first water storage tank and the hot water temperature T6 of the second water storage tank;
if T5 is more than or equal to T6, the central control unit adjusts the control valve group to enable the second water storage tank to be independently connected into the heat exchange loop;
if T6 is larger than T5, the central control unit adjusts the control valve group to enable the first water storage tank to be independently connected into the heat exchange loop. At using hydrothermal in-process, in order to avoid leading to the storage water tank internal temperature to descend too much after even going into the heat transfer return circuit with the storage water tank and influence the user and use experience, compare the temperature of first storage water tank and second storage water tank, even go into the heat transfer return circuit with the lower water tank of temperature, the higher water tank of temperature supplies water to the user to use the hydrothermal defrosting at the user, guarantee going on in order and hydrothermal normal use of defrosting.
Further, the defrosting process according to the relation between the hot water temperature of the two water tanks and the temperature threshold value a comprises the following steps:
whether the hot water temperature T6 in the first water storage tank T5 and the second water storage tank simultaneously reaches a preset temperature threshold value a is judged
If so, judging the relative sizes of T5 and T6, and selecting a water storage tank with low temperature to enter defrosting operation;
if not, the central control unit adjusts the control valve group to enable the second water storage tank and the first water storage tank to be connected into the heat exchange loop at the same time. The temperature threshold value in this scheme is a setting value, when beginning to defrost according to certain temperature that experimental data reachd promptly, the effect of defrosting is best, the thermal loss in the defrosting in-process cistern is minimum, when all reaching this temperature threshold value, it is enough to select the lower storage water tank of temperature earlier to get into the defrosting operation, can guarantee that thermal loss can not be too big, can guarantee the defrosting effect again, and when the temperature did not reach this setting threshold value simultaneously, make second storage water tank and first storage water tank even go into heat transfer circuit simultaneously, guarantee the defrosting effect.
A heat pump water heater comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a throttling mechanism, a first water storage tank, a second water storage tank, a control valve group and a central control unit; the central control unit executes the defrosting operation control method of the water heater.
Has the advantages that: according to the technical scheme, on the premise of ensuring the defrosting effect, the optimization of the heat utilization efficiency defrosting effect is realized, meanwhile, the influence of the defrosting process on the experience of a user when the user uses hot water is prevented, and after the user uses hot water, the heat exchange units in the water storage tanks with lower temperatures in the first water storage tank and the second water storage tank are connected into the heat exchange loop, so that the influence of the defrosting of the water heater on the use of hot water by the user is avoided.
Drawings
FIG. 1 is a schematic diagram of the double water tanks in the embodiment 1.
FIG. 2 is a schematic diagram of the operation of the multi-tank water supply system of the embodiment 2.
FIG. 3 is a flowchart of the operation of example 3.
FIG. 4 is a flowchart of the operation of example 4.
In the figure: the system comprises a heat pump water heater 100, a compressor 1, a four-way reversing valve 2, an outdoor heat exchanger 3, a throttling mechanism 4, a first water storage tank 5, a second water storage tank 6, a three-way valve 7, a control valve 8 and a control mechanism 9.
Detailed Description
The invention is described in detail below with reference to the figures and specific examples.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", and the like indicate positions or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of the description, but do not indicate or imply that the mechanism or element referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", may indicate or implicitly include one or more of the described features.
Example 1: as shown in fig. 1, a heat pump water heater 100 is composed of a compressor 1, a four-way reversing valve 2, an outdoor heat exchanger 3, a throttling mechanism 4, a first water storage tank 5, a second water storage tank 6, a three-way valve 7, a control valve 8 and a control mechanism 9. As shown in fig. 1, the first water storage tank 5 according to the present embodiment includes a first refrigerant-water heat exchanger 51 and a first temperature detection mechanism 52 (including at least 1 temperature sensor). As shown in fig. 1, the second water storage tank 6 according to the present embodiment includes a second refrigerant-water heat exchanger 61 and a second temperature detection means 62 (including at least 1 temperature sensor).
As shown in fig. 1, the four-way selector valve 2 according to the present embodiment has two operation states, i.e., a heating operation and a defrosting operation: when the heat pump unit is in a heating operation state, a refrigerant flow channel in the four-way reversing valve 2 is shown by a solid line in fig. 1; when the heat pump unit is in the defrosting operation state, the refrigerant flow channel in the four-way reversing valve 2 is shown by a dotted line in fig. 1.
As shown in fig. 1, the three-way valve 7 according to the present embodiment has two operation states: in the first operating state, the medium flow passage in the three-way valve 7 is shown by the solid line in fig. 1; in the second operating state, the medium flow passage in the three-way valve 7 is shown by a broken line in fig. 1.
As shown in fig. 1, the control valve 8 according to the present embodiment has two operation states of opening and closing. When the control valve 8 is in an open state, the refrigerant can pass through the control valve 8; when the control valve 8 is in the closed state, the refrigerant cannot pass through the control valve 8.
As shown in fig. 1, the heat pump water heater 100 according to the present embodiment has a plurality of heating operation modes, and for convenience of description, the present embodiment is described with a heat pump water heater including two water storage tanks:
parallel heating operation: the refrigerant flows through the first refrigerant-water heat exchanger 51 and the second refrigerant-water heat exchanger 61 at the same time. The four-way selector valve 2 is in the heating operation state (the refrigerant flow passage in the four-way selector valve is shown by the solid line in fig. 1), the three-way valve 7 is in the first operation state (the refrigerant flow passage in the three-way valve 7 is shown by the solid line in fig. 1), and the control valve 8 is in the open state.
Series heating operation: the refrigerant flows through the first refrigerant-water heat exchanger 51 and then flows through the second refrigerant-water heat exchanger 61. At the moment, the first water storage tank 5 absorbs more heat, so that the temperature is rapidly increased; the second first water storage tank 5 absorbs less heat, and the temperature rise speed is lower than that of the first water storage tank. The four-way selector valve 2 is in the heating running state (the refrigerant flow passage in the four-way selector valve is shown by the solid line in fig. 1), the three-way valve 7 is in the second running state (the refrigerant flow passage in the three-way valve 7 is shown by the broken line in fig. 1), and the control valve 8 is in the closed state.
The first water storage tank 5 is independently heated: the refrigerant can pass through only the first refrigerant-water heat exchanger 51 and cannot pass through the second refrigerant-water heat exchanger 61. The four-way selector valve 2 is in the heating operating state (the refrigerant flow path in the four-way selector valve is shown by the solid line in fig. 1), the three-way valve 7 is in the second operating state (the refrigerant flow path in the three-way valve 7 is shown by the broken line in fig. 1), and the control valve 8 is in the open state.
The second water storage tank 6 is independently heated: the refrigerant can pass through only the second refrigerant-water heat exchanger 61 but cannot pass through the first refrigerant-water heat exchanger 51. The four-way selector valve 2 is in the heating operating state (the refrigerant flow passage in the four-way selector valve is shown by the solid line in fig. 1), the three-way valve 7 is in the first operating state (the refrigerant flow passage in the three-way valve 7 is shown by the solid line in fig. 1), and the control valve 8 is in the closed state.
T5 is the temperature of the hot water in the first water storage tank 5, T6 is the temperature of the hot water in the second water storage tank 6, and Ts is the temperature of the hot water set by a user of the water heater.
Example 2: as shown in fig. 2, the heat pump water heater according to the present embodiment includes a plurality of tanks (4 tanks in total in the illustrated configuration, a, b, c, and d), only a refrigerant-water heat exchanger and corresponding control valves are shown, and a tank main body and a temperature sensor are not shown. The water tanks a, b, c, d are connected in sequence, wherein the water tank a is a basic water tank and comprises a refrigerant-water heat exchanger 51a and a control valve 8a. The water tanks b, c and d have the same structure and are composed of a refrigerant-water heat exchanger, a three-way valve and a control valve. As shown in fig. 2, when the water heater according to the present embodiment needs to install more than 4 water tanks, the water tank, such as the water tank b (or the water tanks c and d), may be installed at the position of "…" in fig. 2. The heat pump hot water heater as shown in fig. 2 can adjust the series-parallel relation between the current water tank and the subsequent water tank and the water tank before the water tank by adjusting the three-way valve and the control valve in the non-basic water tanks (b, c, d).
To describe the control when the heat pump water heater according to the present embodiment includes a plurality of water storage tanks, a case where there are 4 water storage tanks will be described here:
in the heating operation process: when the opening state of the three-way valve 7b is a virtual line position and the control valve 8b is an opening state, the water storage tanks b, c and d and the water storage tank a are in parallel connection; when the three-way valve 7b is opened in a solid line position and the control valve 8b is closed, the water storage tanks b, c and d are connected in series with the water storage tank a.
During the defrosting operation: and the opening and closing states of the three-way valve and the control valve are controlled to control whether the refrigerant is controlled by the corresponding water tank. If the control valve 8a is closed and the three-way valve 7b is opened to the dotted line state, the refrigerant cannot pass through the tank a during the defrosting process. If the control valve 8d is closed, the refrigerant cannot pass through the tank d during the defrosting process.
The heat pump water heater that this embodiment relates contains two above storage water tanks, and when the hot water temperature can satisfy current temperature operation requirement in the lower and lower water tank of temperature of user demand hot water temperature, can be preferentially from providing hot water to the user in the lower water tank of temperature, avoid having consumed high temperature hot water in advance and follow-up user appears and does not appear having the usable phenomenon of high temperature hot water appearing when actually needing to use high temperature hot water, but promote user's in-service use experience.
Example 3: as shown in fig. 3, a heating operation control method of a heat pump water heater includes the following program steps:
s0, starting a program;
s1, the water heater receives operation parameter information set by a user and then enters S2;
s2, the water heater detects the hot water temperatures T5 and T6 in the first water storage tank and the second water storage tank and then enters S3;
s3, judging whether the hot water temperatures T5 and T6 reach the temperature Ts set by a user, if both the T5 and T6 reach the set temperature Ts, entering S4, and if not, entering S6;
s4, the water heater does not perform heating operation and then enters S5;
s5, judging whether the water heater receives a stop signal, if so, entering S16, otherwise, entering S1;
s6, detecting whether the water temperature of only one water tank of the water heater does not reach the set temperature, if the water temperature of only one water tank does not reach the set temperature, entering S7, and if not, entering S11;
and S7, detecting whether the temperature T5 of the hot water in the water tank 5 reaches a set temperature, and if the temperature T5 of the hot water in the water tank 5 does not reach the set temperature. Entering S8, otherwise entering S10;
s8, the water heater is switched to a state of independently heating and operating the first water storage tank, and then S9 is carried out;
s9, the water heater performs heating operation and then enters S5;
s10, the water heater is switched to a state of independently heating and operating the second water storage tank, and then S9 is carried out;
s11, judging whether the operation state of the water heater is set to be a quick heating operation state, if so, entering S12, otherwise, entering S17;
s12, judging whether the water temperature T5 in the first water storage tank is higher than the water temperature T6 in the second water storage tank, if T5 is more than T6, entering S13, and if not, entering S23;
s13, the water heater is switched to a state of independently heating and operating the first water storage tank, and then S14 is carried out;
s14, the water heater performs heating operation, and then the process goes to S15;
s15, judging whether the water heater receives a stop signal, if so, entering S16, otherwise, entering S1;
s16, the water heater is shut down, and then the process goes to S24.
S17, judging whether the water temperature T5 in the first water storage tank is equal to the water temperature T6 in the second water storage tank, if T5= T6, entering S18, and if not, entering S21;
s18, switching the water heater to a parallel heating state, and then entering S19;
s19, the water heater performs heating operation, and then the process goes to S20;
s20, judging whether the water heater receives a stop signal, if so, entering S16, otherwise, entering S1;
s21, judging whether the water temperature T5 in the first water storage tank is smaller than the water temperature T6 in the second water storage tank, if T5 is smaller than T6, entering S22, and if not, entering S10;
s22, switching the water heater to be in a series heating state, and then entering S19;
s23, the water heater is switched to a heating operation state for the second water storage tank independently, and then the process goes to S14.
The heat pump water heater in embodiment 1 is adopted in the program, the related heat pump water heater comprises two water storage tanks, and the two water storage tanks are matched and used under different conditions, so that the requirement of a client on quick water use can be met, the energy in actual use of the water heater can be saved, and the water heater can meet various water use requirements of the user by using the minimum energy in the heating process as far as possible.
Example 4: as shown in fig. 4, a defrosting operation control method for a heat pump water heater includes the following steps:
s0, starting a program, and then entering S1;
s1, the water heater operates normally, and then S2 is started;
s2, judging whether the water heater receives a stop signal, if so, entering S3, and if not, entering S4;
s3, stopping the unit, and then entering S21;
s4, judging whether the water heater meets the defrosting condition, if so, entering S5, otherwise, returning to S1;
s5, detecting the hot water temperatures T5 and T6 in the first water storage tank and the second water storage tank, and then entering S6;
s6, judging whether the user is using hot water, if so, entering S7, otherwise, entering S13;
s7, judging the water temperatures in the second water storage tank and the second water storage tank, if T5 is more than or equal to T6, entering S8, otherwise, entering S9;
s8, adjusting the water heater to a state of providing hot water from the first water storage tank, and then entering S15;
s9, adjusting the water heater to a state of providing hot water from the second water storage tank, and then entering S10;
s10, adjusting the water heater to a defrosting state of absorbing heat from the first water storage tank, and then entering S11;
s11, the water heater performs heat absorption and defrosting operation on the first water storage tank, and then the water heater enters S12;
s12, judging whether the water heater meets the condition of quitting defrosting, if so, entering S1, otherwise, returning to S11;
s13, judging whether the temperatures of hot water in the first water storage tank and the second water storage tank reach a preset temperature threshold value a at the same time, if T5 is larger than or equal to a and T6 is larger than or equal to a, entering S14, and if not, entering S18;
s14, judging whether the water temperature T5 in the first water storage tank is greater than or equal to the water temperature T6 in the second water storage tank, if the water temperature T5 is greater than or equal to the water temperature T6, entering S15, and if not, entering S10;
s15, adjusting the water heater to a defrosting state of absorbing heat from the second water storage tank, and then entering S16;
s16, the water heater performs heat absorption and defrosting operation on the second water storage tank, and then the operation enters S17;
s17, judging whether the water heater meets the condition of quitting defrosting, if so, entering S1, otherwise, returning to S16;
s18, adjusting the water heater to a state of absorbing heat and defrosting from the first water storage tank and the second water storage tank at the same time, and then entering S19;
s19, performing heat absorption and defrosting operation from the first water storage tank and the second water storage tank simultaneously, and then entering S20;
s20, judging whether the water heater meets the condition of quitting defrosting, if so, entering S1, otherwise, returning to S19;
and S21, ending the program.
According to the technical scheme, on the premise of ensuring the defrosting effect, the defrosting process is prevented from influencing the experience of a user when the user uses hot water, and the heat exchange units in the water storage tanks with lower temperatures in the first water storage tank and the second water storage tank are connected into the heat exchange loop after the user uses hot water, so that the influence of defrosting of the water heater on the use of hot water by the user is avoided.
Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that variations, modifications, and substitutions may be made therein by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (3)
1. A defrosting operation control method for a water heater is characterized by comprising the following steps: the water heater comprises a heat exchange loop and a control system; the heat exchange loop comprises a compressor for providing pressure, a four-way reversing valve, a first water storage tank, a second water storage tank, a pipeline for connecting the compressor, the heat exchanger and the water storage tanks together, and control valve groups arranged at all positions of the pipeline; the control system comprises a central control unit and a temperature detector arranged in the water storage tank, wherein the central control unit can adjust the control valve group according to temperature data transmitted by the temperature detector, so that the first water storage tank and the second water storage tank are connected in parallel/in series/separately connected into the heat exchange loop; the control method comprises the following steps:
starting a program, and normally operating the water heater;
judging whether the water heater meets the defrosting condition;
if the water heater meets the defrosting condition, judging whether hot water is used; and is
If the water tank is judged to be using hot water, the hot water is provided for a user from the water tank with higher temperature, and the low-temperature water storage tank is selected for defrosting; the method specifically comprises the following steps: judging the hot water temperature T5 of the first water storage tank and the hot water temperature T6 of the second water storage tank; if T5 is more than or equal to T6, the central control unit adjusts the control valve group to enable the second water storage tank to be independently connected into the heat exchange loop; if T6 is larger than T5, the central control unit adjusts the control valve group to enable the first water storage tank to be independently connected into the heat exchange loop;
if the hot water is not used, detecting the temperatures T5 and T6 of the hot water in the first water storage tank and the second water storage tank, and further judging whether the temperatures T5 and T6 are both greater than a temperature threshold value a; if not, the second water storage tank and the first water storage tank are simultaneously connected into a heat exchange loop; if yes, the relative sizes of T5 and T6 are judged, and the water storage tank with low temperature is selected to enter defrosting operation.
2. The defrosting operation control method of a water heater according to claim 1, wherein the process of determining whether the water heater satisfies the defrosting condition includes the following steps:
judging whether the water heater meets the defrosting condition;
if the water heater does not meet the defrosting condition, the water heater operates normally;
if the water heater meets the defrosting condition, the central control unit adjusts the four-way reversing valve to enable the compressor to be reversely connected into the heat exchange loop.
3. A heat pump water heater, its characterized in that: the system comprises a compressor, a four-way reversing valve, an outdoor heat exchanger, a throttling mechanism, a first water storage tank, a second water storage tank, a control valve group and a central control unit; the central control unit executes the defrosting operation control method of the water heater according to claim 1 or 2.
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| CN202110343716.1A CN113237227B (en) | 2021-03-30 | 2021-03-30 | Heat pump water heater and defrosting operation control method thereof |
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| CN202110343716.1A CN113237227B (en) | 2021-03-30 | 2021-03-30 | Heat pump water heater and defrosting operation control method thereof |
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| CN114963278B (en) * | 2021-08-23 | 2024-01-05 | 青岛海尔新能源电器有限公司 | Intelligent defrosting control method and device, electronic equipment and storage medium |
| CN114963525B (en) * | 2022-01-17 | 2024-01-05 | 青岛海尔新能源电器有限公司 | Heat pump water heater, defrosting method of heat pump water heater and storage medium |
| CN114440453B (en) * | 2022-03-01 | 2024-01-16 | 北溪特(浙江)科技有限公司 | Air energy water heater frosting degree judging method based on fuzzy algorithm |
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| JP4215735B2 (en) * | 2005-03-24 | 2009-01-28 | 日立アプライアンス株式会社 | Heat pump water heater |
| CN104214942B (en) * | 2013-05-31 | 2017-05-31 | 广东美的暖通设备有限公司 | Split hot pump water heater |
| FR3009611A1 (en) * | 2013-08-08 | 2015-02-13 | Ace Sas | HEATING INSTALLATION OF A SANITARY WATER CIRCUIT |
| CN105588331A (en) * | 2014-12-09 | 2016-05-18 | 海信（山东）空调有限公司 | Water tank for heat-pump water heater, heat-pump water heater and use method |
| CN104879916B (en) * | 2015-05-27 | 2018-06-05 | 合肥美的暖通设备有限公司 | Teat pump boiler |
| JP7135493B2 (en) * | 2018-06-25 | 2022-09-13 | 株式会社ノーリツ | heat pump water heater |
| CN112066551B (en) * | 2020-09-07 | 2024-09-10 | 浙江中广电器集团股份有限公司 | Heat pump water heater and control method thereof |
| CN112556179A (en) * | 2020-12-28 | 2021-03-26 | 珠海格力电器股份有限公司 | Air energy water heater and control method and device thereof |
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