CN110296490B - Hot water unit with constant temperature hot water function and control method thereof - Google Patents
Hot water unit with constant temperature hot water function and control method thereof Download PDFInfo
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- CN110296490B CN110296490B CN201910568674.4A CN201910568674A CN110296490B CN 110296490 B CN110296490 B CN 110296490B CN 201910568674 A CN201910568674 A CN 201910568674A CN 110296490 B CN110296490 B CN 110296490B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 287
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000003507 refrigerant Substances 0.000 claims abstract description 69
- 238000010438 heat treatment Methods 0.000 claims abstract description 52
- 230000007246 mechanism Effects 0.000 claims description 26
- 238000004891 communication Methods 0.000 claims description 4
- 238000005057 refrigeration Methods 0.000 claims description 4
- 238000004321 preservation Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract 2
- 239000008236 heating water Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/30—Arrangement or mounting of heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0096—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater combined with domestic apparatus
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- Steam Or Hot-Water Central Heating Systems (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention provides a hot water unit with a constant-temperature hot water function and a control method thereof. The water heater unit comprises a refrigerant heat exchange cycle and a water heat exchange cycle which have heat exchange, and further comprises a water tank, wherein two sets of heat exchange pipelines are arranged in the water tank, two ends of one set of heat exchange pipeline are communicated with the water heat exchange cycle, and two ends of the other set of heat exchange pipeline are communicated with the refrigerant heat exchange cycle. According to the hot water unit with the constant-temperature hot water function and the control method thereof, the two sets of heat exchange pipelines are arranged in the water tank, and the working states of the first three-way valve and the second three-way valve are switched according to the requirements of users, so that the water in the water tank is heated by using the refrigerant and the water respectively or simultaneously, the comfort level of indoor heating during hot water production is improved, a certain heat preservation effect can be achieved for the domestic hot water tank, the frequent switching phenomenon of the heating and hot water production functions is eliminated, the comprehensive reliability of the unit is improved, the start and stop of the unit are reduced, and the service life of the whole unit is prolonged.
Description
Technical Field
The invention relates to the technical field of heat exchange equipment, in particular to a hot water unit with a constant-temperature hot water function and a control method thereof.
Background
At present, the multifunctional water heater generally has the functions of heating, hot water making and refrigerating. The user side equipment comprises a domestic hot water tank, a fan coil and a floor heating coil. The conversion among heating, refrigeration and heating water is switched through the electric three-way valve, when in a heating season, the heating is switched to a heating water function, the multifunctional water heater heats and supplies hot water to circulate to the water tank coil to prepare hot water, at the moment, the heating terminal equipment (the fan coil and the floor heating coil) at the user side stops heat exchange circulation, and the electric three-way valve can act to switch to the heating circulation when the temperature of the domestic hot water tank reaches a set target water tank temperature, so that the indoor temperature can be influenced and reduced in the period of heating water, the fluctuation of the indoor temperature brings poor body feeling to the user, and the heating comfort level is reduced. On the other hand, the multifunctional water heater belongs to a household with large energy consumption, particularly, the uninterrupted switching of the heating function and the heating and refrigerating function seriously affects the energy efficiency of the unit, the service life of the unit is also lost due to frequent startup and shutdown actions, and the use reliability is reduced. The use cost of the user is greatly increased, and the use experience is influenced.
Disclosure of Invention
In order to solve the technical problem that the existing hot water unit cannot heat water during heating, the hot water unit with the constant-temperature hot water function and the control method thereof are provided for simultaneously heating hot water and heating.
A hot water unit comprises a refrigerant heat exchange cycle and a water heat exchange cycle which have heat exchange, and further comprises a water tank, wherein two sets of heat exchange pipelines are arranged in the water tank, two ends of one set of heat exchange pipeline are communicated with the water heat exchange cycle, and two ends of the other set of heat exchange pipeline are communicated with the refrigerant heat exchange cycle.
The water heater unit further comprises on-off mechanisms, and each heat exchange pipeline is provided with one on-off mechanism.
The heat exchange pipelines comprise a first heat exchange pipeline and a second heat exchange pipeline, the first heat exchange pipeline is communicated with the water heat exchange cycle, and the second heat exchange pipeline is communicated with the refrigerant heat exchange cycle.
The on-off mechanism is the three-way valve, and includes first three-way valve and second three-way valve, first three-way valve set up in first heat transfer pipeline with between the water heat transfer circulation, just the entry of first three-way valve with the first export of first three-way valve all with water heat transfer circulation intercommunication, the second export of first three-way valve with heat transfer pipeline intercommunication, the second three-way valve set up in second heat transfer pipeline with between the refrigerant heat transfer circulation, just the entry of second three-way valve with the first export of second three-way valve all with refrigerant heat transfer circulation intercommunication, the second export of second three-way valve with second heat transfer pipeline intercommunication.
The hot water unit also comprises a heat exchanger, and the refrigerant heat exchange cycle and the water heat exchange cycle exchange heat in the heat exchanger.
The refrigerant heat exchange cycle further comprises a throttling mechanism, the second three-way valve is arranged between the throttling mechanism and the heat exchanger, a first outlet of the second three-way valve is communicated with the throttling mechanism, and an inlet of the second three-way valve is communicated with the heat exchanger.
And the first end of the second heat exchange pipeline is communicated with a second outlet of the second three-way valve, and the second end of the second heat exchange pipeline is communicated with the throttling mechanism and the heat exchanger.
The hot water unit further comprises a plurality of heat exchange loads, and all the heat exchange loads are arranged on the water heat exchange cycle in series or in parallel.
The heat exchange load comprises a fan coil and a floor heating coil, and the fan coil and the floor heating coil are arranged on the water heat exchange cycle in series.
And the water outlet of the fan coil is communicated with the water inlet of the floor heating coil.
A control method of the above water heater unit, where the heat exchange line includes a second heat exchange line, and the second heat exchange line is in heat exchange circulation communication with the refrigerant, and the control method includes:
s1, setting a target water tank temperature Tw1 and deviation limit values a and b of the water tank temperature (a is larger than b);
s2, detecting the water temperature Tw in the water tank in real time, and calculating the temperature difference delta T1 of the water tank to be | Tw1-Tw |;
and S3, comparing the delta T1, a and b, and adjusting the on-off state of the heat exchange circulation between the second heat exchange pipeline and the refrigerant according to the comparison result.
Step S3 further includes:
if DeltaT 1 is more than a, enabling the second heat exchange pipeline to be communicated with the refrigerant heat exchange cycle;
if a is not less than Delta T1 and more than b, keeping the on-off state of the heat exchange cycle between the second heat exchange pipeline and the refrigerant unchanged;
and if b is not less than T1, disconnecting the second heat exchange pipeline from the refrigerant heat exchange cycle.
The hot water unit includes a second three-way valve, the second three-way valve is disposed between the second heat exchange pipeline and the refrigerant heat exchange cycle, an inlet of the second three-way valve and the first outlet of the second three-way valve are both communicated with the refrigerant heat exchange cycle, a second outlet of the second three-way valve is communicated with the second heat exchange pipeline, and the step S3 further includes:
if Δ T1 > a, the inlet of the second three-way valve communicates with the second outlet of the second three-way valve;
if a is not less than Delta T1 and more than b, keeping the state of the second three-way valve unchanged;
and if b ≧ Δ T1, communicating the inlet of the second three-way valve with the first outlet of the second three-way valve.
The heat exchange pipeline comprises a first heat exchange pipeline which is communicated with the water heat exchange circulation, the hot water unit comprises a heat exchanger, the refrigerant heat exchange circulation and the water heat exchange circulation exchange heat in the heat exchanger, the hot water unit further comprises a plurality of heat exchange loads, all the heat exchange loads are arranged on the water heat exchange circulation in series or in parallel, and the control method further comprises the following steps:
s01, setting a deviation limit value c of the outlet water temperature of the heat exchanger, a load temperature difference limit value d and a target outlet water temperature To1 of the heat exchanger in a water heat exchange circulation flow mode;
s02, detecting the temperature Ti of inlet water flowing into the heat exchanger in a water heat exchange cycle manner and the temperature To of outlet water flowing out of the heat exchanger in a water heat exchange cycle manner in real time, and calculating the temperature difference delta T2 To be To1-To and the temperature difference delta T3 To be To-Ti;
s03, comparing the delta T2 with c, the delta T1 with a, the delta T3 with d respectively, and adjusting the on-off state of the heat exchange circulation between the first heat exchange pipeline and water according to the comparison result.
Step S03 further includes:
if DeltaT 2 is more than c and DeltaT 1 is more than a, the first heat exchange pipeline and the water heat exchange cycle are in a disconnected state;
if the delta T2 is more than c and a is more than or equal to delta T1 is more than b, the on-off state of the first heat exchange pipeline and the water heat exchange cycle is unchanged;
if the delta T2 is more than c and the delta T1 is less than or equal to b, the first heat exchange pipeline is communicated with the water heat exchange circulation;
if the delta T2 is not more than c and the delta T3 is more than d, the first heat exchange pipeline and the water heat exchange cycle are in a disconnected state;
and if the delta T2 is not less than c and the delta T3 is not less than d, the first heat exchange pipeline is communicated with the water heat exchange circulation.
The hot water unit further includes a first three-way valve, the first three-way valve is disposed between the first heat exchange pipeline and the water heat exchange cycle, an inlet and a first outlet of the first three-way valve are both communicated with the water heat exchange cycle, a second outlet of the first three-way valve is communicated with the heat exchange pipeline, and the step S03 further includes:
if Δ T2 > c and Δ T1 > a, the inlet of the first three-way valve communicates with the first outlet of the first three-way valve;
if DeltaT 2 > c and a ≧ DeltaT 1 > b, the state of the first three-way valve is unchanged;
if delta T2 is more than c and delta T1 is less than or equal to b, the inlet of the first three-way valve is communicated with the second outlet of the first three-way valve;
if delta T2 is not more than c and delta T3 is more than d, the inlet of the first three-way valve is communicated with the first outlet of the first three-way valve;
and if delta T2 is not less than c and delta T3 is not less than d, the inlet of the first three-way valve is communicated with the second outlet of the first three-way valve.
Before step S1, the method further includes: judging the working state of the hot water unit:
if the hot water unit is in the heating mode, continuing to step S2 and step S3;
and if the hot water unit is in a refrigeration mode, the two sets of heat exchange pipelines are in a disconnected state.
According to the hot water unit with the constant-temperature hot water function and the control method thereof, the two sets of heat exchange pipelines are arranged in the water tank, and the working states of the first three-way valve and the second three-way valve are switched according to the requirements of users for heating and hot water making, so that the water in the water tank is heated by using the refrigerant and the water respectively or simultaneously, the comfort level of indoor heating during hot water making is improved, a certain heat preservation effect can be achieved for a domestic hot water tank, the frequent switching phenomenon of the heating and hot water making functions is eliminated, the comprehensive reliability of the unit is improved, the start and stop of the unit are reduced, and the service life of the whole unit is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of a hot water unit of an embodiment of a hot water unit with a constant temperature hot water function and a control method thereof;
in the figure:
1. refrigerant heat exchange cycle; 2. water heat exchange circulation; 3. a water tank; 4. a heat exchange line; 41. a first heat exchange line; 42. a second heat exchange line; 51. a first three-way valve; 52. a second three-way valve; 6. a heat exchanger; 7. and a throttling mechanism.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The hot water unit shown in fig. 1 comprises a refrigerant heat exchange cycle 1 and a water heat exchange cycle 2 with heat exchange, and further comprises a water tank 3, wherein two sets of heat exchange pipelines 4 are arranged in the water tank 3, two ends of one set of heat exchange pipeline 4 are communicated with the water heat exchange cycle 2, and two ends of the other set of heat exchange pipeline 4 are communicated with the refrigerant heat exchange cycle 1, so that the water in the water tank 3 can be heated by the selected refrigerant or the water and the selected refrigerant can be heated simultaneously, the effect of heating water in the hot water unit is improved, the start and stop of the unit can be reduced as much as possible when the water in the water tank 3 is heated, the comfort of indoor heating is improved, and the comprehensive use energy efficiency and the service life of the unit are improved.
The water heater unit further comprises on-off mechanisms, one on-off mechanism is arranged on each heat exchange pipeline 4, and the on-off mechanisms are used for controlling the on-off of the corresponding heat exchange pipelines 4, so that refrigerants or water can be selected or enter the water tank 3 for heat exchange.
The heat exchange pipeline 4 comprises a first heat exchange pipeline 41 and a second heat exchange pipeline 42, the first heat exchange pipeline 41 is communicated with the water heat exchange cycle 2, and the second heat exchange pipeline 42 is communicated with the refrigerant heat exchange cycle 1.
The on-off mechanism is a three-way valve and comprises a first three-way valve 51 and a second three-way valve 52, the first three-way valve 51 is arranged between the first heat exchange pipeline 41 and the water heat exchange cycle 2, an inlet of the first three-way valve 51 and a first outlet of the first three-way valve 51 are both communicated with the water heat exchange cycle 2, a second outlet of the first three-way valve 51 is communicated with the heat exchange pipeline 4, the second three-way valve 52 is arranged between the second heat exchange pipeline 42 and the refrigerant heat exchange cycle 1, an inlet of the second three-way valve 52 and a first outlet of the second three-way valve 52 are both communicated with the refrigerant heat exchange cycle 1, a second outlet of the second three-way valve 52 is communicated with the second heat exchange pipeline 42, namely the on-off mechanism is arranged at the end of the heat exchange pipeline 4, and the on-off of the heat exchange pipeline 4 can be effectively controlled by the switching action of the three-way, effectively prevent that the indoor heating temperature from fluctuating, promote the travelling comfort of indoor heating to play the heat preservation effect to domestic hot water tank 3, make the user in time use the hot water of target temperature state, realize the economy and the high travelling comfort operation of hot water unit.
The hot water unit further comprises a heat exchanger 6, the refrigerant heat exchange cycle 1 and the water heat exchange cycle 2 exchange heat in the heat exchanger 6, and the water heat exchange cycle 2 is provided with water inlet flowing into the heat exchanger 6 and water outlet flowing out of the heat exchanger 6 at the heat exchanger 6.
The refrigerant heat exchange cycle 1 further comprises a throttling mechanism 7, the second three-way valve 52 is arranged between the throttling mechanism 7 and the heat exchanger 6, a first outlet of the second three-way valve 52 is communicated with the throttling mechanism 7, an inlet of the second three-way valve 52 is communicated with the heat exchanger 6, namely, when the refrigerant is used for heating the water in the water tank 3, the refrigerant after heat exchange through the heat exchanger 6 is used for heating the water in the water tank 3, and therefore the heat exchange amount in the water heat exchange cycle 2 is ensured as much as possible.
The water heating unit further comprises a compressor, a four-way valve and an outdoor heat exchanger, and the compressor, the four-way valve, the heat exchanger, the throttling mechanism and the outdoor heat exchanger are sequentially connected in series to form a refrigerant heat exchange cycle.
A first end of the second heat exchange pipeline 42 is communicated with a second outlet of the second three-way valve 52, a second end of the second heat exchange pipeline is communicated with a position between the throttling mechanism 7 and the heat exchanger 6, and the refrigerant entering the water tank 3 flows back to the refrigerant heat exchange cycle 1 after heat exchange, and then flows back to the refrigerant heat exchange cycle 1 through the throttling action of the throttling mechanism 7 again to perform normal heat exchange cycle.
The hot water unit further comprises a plurality of heat exchange loads, and all the heat exchange loads are arranged on the water heat exchange cycle 2 in series or in parallel.
The heat exchange load comprises a fan coil and a floor heating coil, and the fan coil and the floor heating coil are arranged on the water heat exchange cycle 2 in series.
The water outlet of the fan coil is communicated with the water inlet of the floor heating coil, the fan coil and the floor heating are connected in series, a thermodynamic temperature field can be comprehensively provided for a user, the required temperature of the fan coil is generally higher than that of the floor heating, and therefore the air coil is arranged in front.
A control method of the above water heater unit, wherein the heat exchange line 4 comprises a second heat exchange line 42, and the second heat exchange line 42 is communicated with the refrigerant heat exchange cycle 1, the control method comprising:
s1, setting a target temperature Tw1 of the water tank 3 and temperature deviation limit values a and b (a is larger than b) of the water tank 3;
s2, detecting the water temperature Tw in the water tank 3 in real time, and calculating the temperature difference delta T1 of the water tank 3 to be | Tw1-Tw |;
and S3, comparing the delta T1 with a and b, and adjusting the on-off state of the second heat exchange pipeline 42 and the refrigerant heat exchange cycle 1 according to the comparison result.
Step S3 further includes:
if Δ T1 > a, the second heat exchange pipeline 42 is in a communication state with the refrigerant heat exchange cycle 1, that is, when a large amount of hot water or high-temperature hot water is required, the refrigerant directly heats the water in the water tank 3, thereby satisfying the hot water supply of the water tank 3;
if a is not less than or equal to delta T1 and more than b, keeping the on-off state of the second heat exchange pipeline 42 and the refrigerant heat exchange cycle 1 unchanged, namely the heat exchange amount in the water tank 3 at the moment meets the hot water requirement;
if b is not less than T1, the second heat exchange pipeline 42 and the refrigerant heat exchange cycle 1 are in a disconnected state, that is, the hot water supply is satisfied, and the water in the water tank 3 is subjected to heat exchange or heat preservation by using the water in the water heat exchange cycle 2.
The hot water unit includes a second three-way valve 52, the second three-way valve 52 is disposed between the second heat exchange line 42 and the refrigerant heat exchange cycle 1, an inlet and a first outlet of the second three-way valve 52 are both communicated with the refrigerant heat exchange cycle 1, a second outlet of the second three-way valve 52 is communicated with the second heat exchange line 42, and step S3 further includes:
if Δ T1 > a, the inlet of the second three-way valve 52 is communicated with the second outlet of the second three-way valve 52, that is, when a large amount of hot water or high-temperature hot water is required, the refrigerant directly heats the water in the water tank 3, thereby satisfying the hot water supply of the water tank 3;
if a is not less than Delta T1 and more than b, the state of the second three-way valve 52 is kept unchanged, namely the heat exchange quantity in the water tank 3 at the moment meets the requirement of hot water;
if b is not less than Δ T1, the inlet of the second three-way valve 52 is communicated with the first outlet of the second three-way valve 52, that is, the hot water supply is satisfied at this time, and the water in the water tank 3 is subjected to heat exchange or heat preservation by using the water in the water heat exchange cycle 2.
The heat exchange pipeline 4 comprises a first heat exchange pipeline 41, the first heat exchange pipeline 41 is communicated with the water heat exchange cycle 2, the hot water unit comprises a heat exchanger 6, the refrigerant heat exchange cycle 1 and the water heat exchange cycle 2 exchange heat in the heat exchanger 6, the hot water unit further comprises a plurality of heat exchange loads, all the heat exchange loads are arranged on the water heat exchange cycle 2 in series or in parallel, and the control method further comprises the following steps:
s01, setting a water outlet temperature deviation limit value c and a load temperature difference limit value d of the heat exchanger 6 and a target water outlet temperature To1 of the water heat exchange circulation 2 flowing out of the heat exchanger 6;
s02, detecting the temperature Ti of inlet water flowing into the heat exchanger 6 of the water heat exchange cycle 2 and the temperature To of outlet water flowing out of the heat exchanger 6 of the water heat exchange cycle 2 in real time, and calculating the temperature difference delta T2 To be To1-To and the temperature difference delta T3 To be To-Ti of the heat exchanger 6;
s03, comparing the delta T2 with c, the delta T1 with a, the delta T3 with d respectively, and adjusting the on-off state of the first heat exchange pipeline 41 and the water heat exchange cycle 2 according to the comparison result.
Step S03 further includes:
if Δ T2 > c and Δ T1 > a, the first heat exchange pipeline 41 and the water heat exchange cycle 2 are in a disconnected state, and at this time, the second heat exchange pipeline 42 is communicated with the refrigerant heat exchange cycle 1, so that the refrigerant is directly used for heating the water in the water tank 3, and the water heat exchange cycle 2 is used for heating;
if delta T2 is more than c and a is more than or equal to delta T1 is more than b, the on-off state of the first heat exchange pipeline 41 and the water heat exchange cycle 2 is unchanged, namely the current hot water unit simultaneously meets the requirements of hot water and heating;
if delta T2 is more than c and delta T1 is less than or equal to b, the first heat exchange pipeline 41 and the water heat exchange cycle 2 are in a communicated state, the second heat exchange pipeline 42 and the refrigerant heat exchange cycle 1 are in a disconnected state at the moment, and heat in the water heat exchange cycle 2 is only utilized to exchange heat for water in the water tank 3;
if delta T2 is less than or equal to c and delta T3 is greater than d, the first heat exchange pipeline 41 and the water heat exchange cycle 2 are in a disconnected state, namely the heating requirement of the hot water unit is large at the moment, so that the heat exchange quantity of the water heat exchange cycle 2 is completely used for heating;
if delta T2 is not less than c and delta T3 is not less than d, the first heat exchange pipeline 41 is communicated with the water heat exchange cycle 2, namely the heating requirement of the hot water unit is not large at the moment, so that the heat exchange quantity in the water heat exchange cycle 2 is enabled to keep the heat of the water in the water tank 3, and the hot water supply is ensured.
The water heater unit further includes a first three-way valve 51, the first three-way valve 51 is disposed between the first heat exchange pipeline 41 and the water heat exchange cycle 2, an inlet and a first outlet of the first three-way valve 51 are both communicated with the water heat exchange cycle 2, a second outlet of the first three-way valve 51 is communicated with the heat exchange pipeline 4, and the step S03 further includes:
if Δ T2 > c and Δ T1 > a, the inlet of the first three-way valve 51 is communicated with the first outlet of the first three-way valve 51, and at this time, the second heat exchange pipeline 42 is communicated with the refrigerant heat exchange cycle 1, so that the refrigerant is directly used for heating the water in the water tank 3, and the water in the water heat exchange cycle 2 is used for heating;
if Δ T2 > c and a ≧ Δ T1 > b, the state of the first three-way valve 51 is unchanged, that is, the current hot water unit simultaneously satisfies the supply of hot water and heating;
if delta T2 is more than c and delta T1 is less than or equal to b, the inlet of the first three-way valve 51 is communicated with the second outlet of the first three-way valve 51, the second heat exchange pipeline 42 and the refrigerant heat exchange cycle 1 are in a disconnected state at the moment, and heat in the water heat exchange cycle 2 is only utilized to exchange heat for water in the water tank 3;
if delta T2 is less than or equal to c and delta T3 is greater than d, the inlet of the first three-way valve 51 is communicated with the first outlet of the first three-way valve 51, namely the heating requirement of the hot water unit is large at the moment, so that the heat exchange quantity of the water heat exchange cycle 2 is completely used for heating;
if delta T2 is not less than c and delta T3 is not less than d, the inlet of the first three-way valve 51 is communicated with the second outlet of the first three-way valve 51, that is, the heating requirement of the hot water unit is not large at this time, so that the heat exchange quantity in the water heat exchange cycle 2 is enabled to keep the temperature of the water in the water tank 3, and the hot water supply is ensured.
Before step S1, the method further includes: judging the working state of the hot water unit:
if the hot water unit is in the heating mode, continuing to step S2 and step S3;
if the hot water unit is in a refrigeration mode, the two sets of heat exchange pipelines 4 are in a disconnected state.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (17)
1. A water heating unit comprising a refrigerant heat exchange cycle (1) and a water heat exchange cycle (2) with heat exchange, characterized in that: the water tank is characterized by further comprising a water tank (3), two sets of heat exchange pipelines (4) are arranged in the water tank (3), two ends of one set of heat exchange pipeline (4) are communicated with the water heat exchange cycle (2), two ends of the other set of heat exchange pipeline (4) are communicated with the refrigerant heat exchange cycle (1), the heat exchange pipeline (4) comprises a second heat exchange pipeline (42), the second heat exchange pipeline (42) is communicated with the refrigerant heat exchange cycle (1), and the on-off state of the second heat exchange pipeline (42) and the refrigerant heat exchange cycle (1) is adjusted according to a comparison result of a difference value between water temperature Tw in the water tank (3) and preset water tank target temperature Tw1 and preset water tank temperature deviation limit values a and b (a & gtb) of the water tank (3) detected in real time.
2. The water heater assembly according to claim 1, wherein: the hot water unit further comprises on-off mechanisms, and each heat exchange pipeline (4) is provided with one on-off mechanism.
3. The water heater assembly according to claim 2, wherein: the heat exchange pipeline (4) comprises a first heat exchange pipeline (41) and a second heat exchange pipeline (42), the first heat exchange pipeline (41) is communicated with the water heat exchange cycle (2), and the second heat exchange pipeline (42) is communicated with the refrigerant heat exchange cycle (1).
4. The water heater assembly according to claim 3, wherein: the on-off mechanism is a three-way valve and comprises a first three-way valve (51) and a second three-way valve (52), the first three-way valve (51) being arranged between the first heat exchange line (41) and the water heat exchange cycle (2), and the inlet of the first three-way valve (51) and the first outlet of the first three-way valve (51) are both in communication with the water heat exchange cycle (2), a second outlet of the first three-way valve (51) is communicated with the heat exchange pipeline (4), the second three-way valve (52) is disposed between the second heat-exchange line (42) and the refrigerant heat-exchange cycle (1), and an inlet of the second three-way valve (52) and a first outlet of the second three-way valve (52) are both communicated with the refrigerant heat exchange cycle (1), a second outlet of the second three-way valve (52) communicates with the second heat exchange line (42).
5. The water heater assembly according to claim 4, wherein: the hot water unit further comprises a heat exchanger (6), and the refrigerant heat exchange cycle (1) and the water heat exchange cycle (2) exchange heat in the heat exchanger (6).
6. The water heater assembly according to claim 5, wherein: the refrigerant heat exchange cycle (1) further comprises a throttling mechanism (7), the second three-way valve (52) is arranged between the throttling mechanism (7) and the heat exchanger (6), a first outlet of the second three-way valve (52) is communicated with the throttling mechanism (7), and an inlet of the second three-way valve (52) is communicated with the heat exchanger (6).
7. The water heater assembly according to claim 6, wherein: and a first end of the second heat exchange pipeline (42) is communicated with a second outlet of the second three-way valve (52), and a second end of the second heat exchange pipeline is communicated with the throttling mechanism (7) and the heat exchanger (6).
8. The water heater assembly according to claim 1, wherein: the hot water unit further comprises a plurality of heat exchange loads, and all the heat exchange loads are arranged on the water heat exchange circulation (2) in series or in parallel.
9. The water heater assembly according to claim 8, wherein: the heat exchange load comprises a fan coil and a floor heating coil, and the fan coil and the floor heating coil are arranged on the water heat exchange circulation (2) in series.
10. The water heater assembly according to claim 9, wherein: and the water outlet of the fan coil is communicated with the water inlet of the floor heating coil.
11. A control method of a hot water unit according to any one of claims 1 to 10, characterized in that: the heat exchange line (4) comprises a second heat exchange line (42), the second heat exchange line (42) is communicated with the refrigerant heat exchange cycle (1), and the control method comprises the following steps:
s1, setting a target temperature Tw1 of the water tank (3) and temperature deviation limit values a and b (a is larger than b) of the water tank (3);
s2, detecting the water temperature Tw in the water tank (3) in real time, and calculating the temperature difference delta T1 of the water tank (3) to be | Tw1-Tw |;
and S3, comparing the delta T1 with a and b, and adjusting the on-off state of the second heat exchange pipeline (42) and the refrigerant heat exchange cycle (1) according to the comparison result.
12. The control method according to claim 11, characterized in that: step S3 further includes:
if Δ T1 > a, placing said second heat exchange line (42) in communication with said refrigerant heat exchange cycle (1);
if a is more than or equal to delta T1 and more than b, keeping the on-off state of the second heat exchange pipeline (42) and the refrigerant heat exchange cycle (1) unchanged;
and if b is not less than T1, disconnecting the second heat exchange pipeline (42) from the refrigerant heat exchange cycle (1).
13. The control method according to claim 11, characterized in that: the water heater unit includes a second three-way valve (52), the second three-way valve (52) is disposed between the second heat exchange pipeline (42) and the refrigerant heat exchange cycle (1), an inlet and a first outlet of the second three-way valve (52) are both communicated with the refrigerant heat exchange cycle (1), a second outlet of the second three-way valve (52) is communicated with the second heat exchange pipeline (42), and the step S3 further includes:
if Δ T1 > a, the inlet of the second three-way valve (52) communicates with the second outlet of the second three-way valve (52);
if a ≧ Δ T1 > b, maintaining the state of the second three-way valve (52) unchanged;
and if b ≧ Δ T1, communicating the inlet of the second three-way valve (52) with the first outlet of the second three-way valve (52).
14. The control method according to claim 11, characterized in that: the heat exchange pipeline (4) comprises a first heat exchange pipeline (41), the first heat exchange pipeline (41) is communicated with the water heat exchange circulation (2), the hot water unit comprises a heat exchanger (6), the refrigerant heat exchange circulation (1) and the water heat exchange circulation (2) exchange heat in the heat exchanger (6), the hot water unit further comprises a plurality of heat exchange loads, and all the heat exchange loads are arranged on the water heat exchange circulation (2) in series or in parallel, and the control method further comprises the following steps:
s01, setting a water outlet temperature deviation limit value c and a load temperature difference limit value d of the heat exchanger (6) and a target water outlet temperature To1 of the water heat exchange circulation (2) flowing out of the heat exchanger (6);
s02, detecting the temperature Ti of inlet water flowing into the heat exchanger (6) of the water heat exchange cycle (2) and the temperature To of outlet water flowing out of the heat exchanger (6) of the water heat exchange cycle (2) in real time, and calculating the temperature difference delta T2 To be To1-To and the temperature difference delta T3 To be To-Ti of the heat exchanger (6);
s03, comparing delta T2 with c, delta T1 with a, b and delta T3 with d respectively, and adjusting the on-off state of the first heat exchange pipeline (41) and the water heat exchange cycle (2) according to the comparison result.
15. The control method according to claim 14, characterized in that: step S03 further includes:
if Δ T2 > c and Δ T1 > a, the first heat exchange line (41) is disconnected from the water heat exchange cycle (2);
if delta T2 is more than c and a is more than or equal to delta T1 is more than b, the on-off state of the first heat exchange pipeline (41) and the water heat exchange cycle (2) is unchanged;
if delta T2 is more than c and delta T1 is less than or equal to b, the first heat exchange pipeline (41) is communicated with the water heat exchange cycle (2);
if delta T2 is less than or equal to c and delta T3 is more than d, the first heat exchange pipeline (41) and the water heat exchange cycle (2) are in a disconnected state;
if delta T2 is less than or equal to c and delta T3 is less than or equal to d, the first heat exchange pipeline (41) is communicated with the water heat exchange circulation (2).
16. The control method according to claim 14, characterized in that: the water heater unit further comprises a first three-way valve (51), the first three-way valve (51) is arranged between the first heat exchange pipeline (41) and the water heat exchange cycle (2), an inlet and a first outlet of the first three-way valve (51) are both communicated with the water heat exchange cycle (2), a second outlet of the first three-way valve (51) is communicated with the heat exchange pipeline (4), and the water heater unit further comprises in step S03:
if Δ T2 > c and Δ T1 > a, the inlet of the first three-way valve (51) communicates with the first outlet of the first three-way valve (51);
if DeltaT 2 > c and a ≧ DeltaT 1 > b, the state of the first three-way valve (51) is unchanged;
if DeltaT 2 is more than c and DeltaT 1 is less than or equal to b, the inlet of the first three-way valve (51) is communicated with the second outlet of the first three-way valve (51);
if Δ T2 is less than or equal to c and Δ T3 is greater than d, the inlet of the first three-way valve (51) is communicated with the first outlet of the first three-way valve (51);
if DeltaT 2 is less than or equal to c and DeltaT 3 is less than or equal to d, the inlet of the first three-way valve (51) is communicated with the second outlet of the first three-way valve (51).
17. The control method according to claim 11, characterized in that: before step S1, the method further includes: judging the working state of the hot water unit:
if the hot water unit is in the heating mode, continuing to step S2 and step S3;
if the hot water unit is in a refrigeration mode, the two sets of heat exchange pipelines (4) are in a disconnected state.
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| CN111536711B (en) * | 2020-04-08 | 2021-05-07 | 珠海格力电器股份有限公司 | Heat pump hot water unit and control method for water flow abnormity thereof |
| CN112161350B (en) * | 2020-09-15 | 2022-02-22 | 珠海格力电器股份有限公司 | Air conditioning unit with adjustable heat exchange rate and control method thereof |
| CN112361601B (en) * | 2020-10-16 | 2021-10-12 | 珠海格力电器股份有限公司 | Waterway connection structure and modular hot water unit |
| CN114485254B (en) * | 2022-02-18 | 2023-10-10 | 佳木斯大学 | Uniform heat exchange control method for aircraft equipment |
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