CN108507125B - Air conditioning unit compound mode control method - Google Patents
Air conditioning unit compound mode control method Download PDFInfo
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- CN108507125B CN108507125B CN201810063411.3A CN201810063411A CN108507125B CN 108507125 B CN108507125 B CN 108507125B CN 201810063411 A CN201810063411 A CN 201810063411A CN 108507125 B CN108507125 B CN 108507125B
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 68
- 150000001875 compounds Chemical class 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 377
- 230000008859 change Effects 0.000 claims abstract description 105
- 238000010438 heat treatment Methods 0.000 claims description 74
- 238000005057 refrigeration Methods 0.000 claims description 26
- 238000011084 recovery Methods 0.000 claims description 20
- 239000002131 composite material Substances 0.000 claims description 15
- 230000000694 effects Effects 0.000 description 37
- 239000008236 heating water Substances 0.000 description 8
- 238000001816 cooling Methods 0.000 description 6
- 239000003507 refrigerant Substances 0.000 description 6
- 230000003247 decreasing effect Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 2
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention discloses a compound mode control method of an air conditioning unit, which comprises the steps of obtaining the running time of a compressor in the current running mode; judging whether the running time is more than or equal to a preset minimum running time or not; if yes, acquiring the actual inlet water temperature Tewi of the air conditioner side heat exchanger and the preset target inlet water temperature TewidActual temperature Tt of hot water side tank, preset target tank temperature Ttd(ii) a According to Tewi, Tewid、Tt、TtdJudging whether the operation mode needs to be switched or not; if yes, then according to Tewi, Tewid、Tt、TtdDetermining a next operation mode; judging whether the change rate of the inlet water temperature of the air-conditioning side heat exchanger or the change rate of the water temperature of the hot water side water tank meets the switching condition or not; if so, controlling the unit to switch to the next operation mode; the control method disclosed by the invention is accurate in control, avoids frequent mode switching, avoids frequent starting and stopping of the compressor and ensures the running stability of the unit.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a compound mode control method for an air conditioning unit.
Background
The heat recovery heat pump unit is used for preparing hot water by utilizing heat released in a refrigerant condensation heat release process in a refrigeration cycle, has a multi-purpose function compared with a common heat pump water heater, can provide domestic hot water and can also provide air conditioner supply for indoor space. Compared with the traditional air conditioning unit, the heat recovery heat pump unit has the advantages of energy conservation and environmental protection, and is widely applied to occasions such as large hotels, guesthouses, medical and health centers, schools and the like.
The traditional heat recovery unit can only realize single-mode operation control generally, namely, the single-mode operation comprises a common refrigeration mode, a heating mode, a hot water heating mode and a heat recovery mode. Wherein, the heat recovery mode can realize heating the operation of water mode and can realize the operation of refrigeration mode, if the heat recovery mode of operation, the water system includes two the tunnel: the hot water supply system is characterized in that one way is air conditioner side supply, the other way is hot water side supply, the control target is to enable the water inlet temperature of the air conditioner side system to reach the preset target water temperature, and the water tank temperature of the hot water side system reaches the preset target water tank temperature.
The current air conditioning unit only judges that the modes are automatically switched according to the water temperature, the control is not accurate enough, the modes are frequently switched, and then a compressor is frequently started and stopped, so that the stability of the unit is poor, and the user experience is poor.
Disclosure of Invention
The invention provides a compound mode control method of an air conditioning unit, which avoids frequent start and stop of a compressor and improves the operation stability.
In order to solve the technical problems, the invention adopts the following technical scheme:
a control method for compound mode of air conditioning unit comprises a summer compound mode and a winter compound mode; the summer compound mode comprises a refrigeration mode, a hot water heating mode, a heat recovery mode and a standby mode; the winter compound mode comprises a heating mode, a hot water heating mode and a standby mode; when the unit is in a summer composite mode or a winter composite mode, the control method comprises the following steps:
acquiring the running time of the compressor in the current running mode;
judging whether the running time is more than or equal to a preset minimum running time or not;
if yes, acquiring the actual inlet water temperature Tewi of the air conditioner side heat exchanger and the preset target inlet water temperature TewidActual temperature Tt of hot water side tank, preset target tank temperature Ttd(ii) a According to Tewi, Tewid 、Tt、TtdJudging whether the operation mode needs to be switched or not;
if yes, then according to Tewi, Tewid 、Tt、TtdDetermining a next operation mode;
judging whether the change rate of the inlet water temperature of the air-conditioning side heat exchanger or the change rate of the water temperature of the hot water side water tank meets the switching condition or not;
and if so, controlling the unit to switch to the next operation mode.
Further, when the unit is in summer composite mode, the Tewi and Tewi are usedd 、Tt、TtdJudging whether the operation mode needs to be switched or not, specifically comprising the following steps:
judging whether Tewi is satisfied or notd≤Tewi≤Tewid+ Ta or Ttd-Tb≤Tt≤Ttd；
If so, the operation mode does not need to be switched; if not, the operation mode needs to be switched;
wherein Ta and Tb are return difference temperatures.
Still further, when the unit is in summer composite mode, said Tewi, Tewid 、Tt、TtdDetermining the next operation mode specifically comprises:
if Tewi > Tewid+ Ta, and Tt < TtdTb, determining the next operation mode as a heat recovery mode;
if Tewi > Tewid+ Ta, and Tt > TtdIf yes, judging that the next operation mode is a refrigeration mode;
if Tewi < TewidAnd Tt < TtdTb, determining the next operation mode as a hot water making mode;
if Tewi < TewidAnd Tt > TtdThen the next operation mode is determined as the standby mode.
Furthermore, when the unit is in the summer compound mode, the determining whether the change rate of the inlet water temperature of the air-conditioning side heat exchanger or the change rate of the water temperature of the hot water side water tank meets the switching condition specifically includes:
(1) when the current operation mode is a hot water making mode: if the change rate of the water temperature of the hot water side water tank is larger than or equal to a first set change rate, the switching condition is met;
(2) when the current operation mode is a refrigeration mode: if the change rate of the inlet water temperature of the air-conditioning side heat exchanger is less than or equal to a second set change rate, the switching condition is met;
(3) when the current operation mode is a heat recovery mode: if the change rate of the water temperature of the hot water side water tank is larger than or equal to a first set change rate, or the change rate of the inlet water temperature of the air-conditioning side heat exchanger is smaller than or equal to a second set change rate, the switching condition is met;
(4) when the current operation mode is the standby mode: the switching condition is satisfied; wherein,
water temperature change rate = (water temperature collected at current time t 2-water temperature collected at last time t 1)/(t 2-t 1).
Still further, when the unit is in the summer compound mode, after the unit is powered on and before the unit is started, the control method further includes:
(1) acquiring actual inlet water temperature Tewi of the air conditioner side heat exchanger and preset target inlet water temperature TewidActual water inlet temperature Tt of hot water side heat exchanger, preset target water tank temperature Ttd；
(2) Calculating air conditioner side starting temperature difference DTAir-conditioning side=Tewi-Tewid；
Calculating hot water side starting temperature difference DTHot water side=Ttd-Tt；
(3) If DTAir-conditioning sideMore than or equal to the preset temperature difference of the air conditioner side target starting, and DTHot water sideIf the target starting temperature difference is larger than or equal to the preset hot water side target starting temperature difference, starting and operating the unit in a heat recovery mode;
if DTAir-conditioning sideMore than or equal to the preset temperature difference of the air conditioner side target starting, and DTHot water sideIf the target starting temperature difference is less than the preset hot water side target starting temperature difference, the unit is started to operate in a refrigeration mode;
if DTAir-conditioning side< preset air conditioner side target starting temperature difference, and DTHot water sideIf the target starting temperature difference is larger than or equal to the preset hot water side target starting temperature difference, starting the unit to operate in a hot water heating mode;
if DTAir-conditioning side< preset air conditioner side target starting temperature difference, and DTHot water side< PresetAnd (4) starting the hot water side target by temperature difference, and then enabling the unit to stand by.
Further, when the unit is in winter compound mode, the Tewi and Tewi are usedd 、Tt、TtdJudging whether the operation mode needs to be switched or not, specifically comprising the following steps:
judging whether Tewi is satisfied or notd≤Tewi≤Tewid+ Tc or Ttd-Td≤Tt≤Ttd；
If so, the operation mode does not need to be switched; if not, the operation mode needs to be switched;
wherein Tc and Td are return difference temperatures.
Still further, said Tewi, Tewi-dependent reference numerals are used when the unit is in winter compound moded 、Tt、TtdDetermining the next operation mode specifically comprises:
if Tewi > Tewid+ Tc and Tt < TtdTd, determining that the next operation mode is a hot water heating mode;
if Tewi > Tewid+ Tc, and Tt > TtdIf yes, judging the next operation mode as a standby mode;
if Tewi < TewidAnd Tt < TtdTd, determining the next operation mode as the operation mode with the highest priority according to a preset priority rule;
if Tewi < TewidAnd Tt > TtdThen, the next operation mode is determined as the heating mode.
Preferably, the preset priority rule is as follows: the priority ranking from high to low is: heating mode, hot water heating mode and standby mode.
Further, when the unit is in the winter compound mode, it is judged whether the inlet water temperature change rate of the air conditioner side heat exchanger or the water temperature change rate of the hot water side water tank meets the switching condition, and the method specifically includes the following steps:
(1) when the current operation mode is a hot water making mode: if the change rate of the water temperature of the hot water side water tank is larger than or equal to a third set change rate, the switching condition is met;
(2) when the current operation mode is a heating mode: if the change rate of the inlet water temperature of the air-conditioning side heat exchanger is larger than or equal to the fourth set change rate, the switching condition is met;
(3) when the current operation mode is the standby mode: the switching condition is satisfied; wherein,
water temperature change rate = (water temperature collected at current time t 2-water temperature collected at last time t 1)/(t 2-t 1).
Still further, when the unit is in the winter compound mode, after the unit is powered on and before the unit is started, the control method further includes:
(1) acquiring actual inlet water temperature Tewi of the air conditioner side heat exchanger and preset target inlet water temperature TewidActual water inlet temperature Tt of hot water side heat exchanger, preset target water tank temperature Ttd；
(2) Calculating air conditioner side starting temperature difference DTAir-conditioning side= Tewid - Tewi；
Calculating hot water side starting temperature difference DTHot water side=Ttd-Tt；
(3) If DTAir-conditioning sideThe unit is started to operate in a heating mode if the preset target starting temperature difference of the air conditioner side is greater than or equal to the preset target starting temperature difference;
if DTAir-conditioning side< preset air conditioner side target starting temperature difference, and DTHot water sideIf the target starting temperature difference is larger than or equal to the preset hot water side target starting temperature difference, starting the unit to operate in a hot water heating mode;
if DTAir-conditioning side< preset air conditioner side target starting temperature difference, and DTHot water sideIf the target starting temperature difference is less than the preset hot water side target starting temperature difference, the unit is in standby.
Compared with the prior art, the invention has the advantages and positive effects that: the air conditioning unit compound mode control method of the invention obtains the running time of the compressor in the current running mode; judging whether the running time is more than or equal to a preset minimum running time or not; if yes, acquiring the actual inlet water temperature Tewi of the air conditioner side heat exchanger and the preset target inlet water temperature TewidActual temperature Tt of hot water side tank, preset target tank temperature Ttd(ii) a According to Tewi, Tewid、Tt、TtdJudging whether the operation mode needs to be switched or not; if it isIf yes, then according to Tewi, Tewid、Tt、TtdDetermining a next operation mode; judging whether the change rate of the inlet water temperature of the air-conditioning side heat exchanger or the change rate of the water temperature of the hot water side water tank meets the switching condition or not; if so, controlling the unit to switch to the next operation mode; according to the control method, the mode switching is performed only when the running time of the compressor, the water inlet temperature of the heat exchanger on the air conditioner side, the temperature of the water tank on the hot water side and the change rate of the water temperature meet the conditions, the control is accurate, the mode switching is prevented from being frequent, the compressor is prevented from being started and stopped frequently, the running stability of the unit is ensured, and the use experience of a user is improved.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a system diagram of an air conditioning unit;
FIG. 2 is a flow chart of an embodiment of a compound mode control method for an air conditioning unit according to the present invention;
FIG. 3 is a region diagram of the inlet water temperature of the heat exchanger on the air conditioner side and the water tank temperature on the hot water side in the summer composite mode;
fig. 4 is a region diagram of the temperature of the inlet water of the air-conditioning side heat exchanger and the temperature of the hot water side water tank in the winter compound mode.
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 examples.
The embodiment provides a control method for a composite module of an air conditioning unit, wherein the air conditioning unit mainly comprises a compressor, a four-way valve 4WV2, a four-way valve 4WV1, a heat exchanger, an air conditioning side heat exchanger, a hot water side heat exchanger, a gas-liquid separator, an electronic expansion valve EXV1, four solenoid valves SV1, SV2, SV3 and SV4, and the control method is shown in FIG. 1.
In the cooling mode: the method comprises the steps that an air conditioner side water pump (arranged on a water inlet pipe of an air conditioner side heat exchanger) runs, a hot water side water pump (arranged on a water inlet pipe of a hot water side heat exchanger) runs, SV1 is opened, SV2 is closed, SV3 is closed, SV4 is opened, 4WV1 is closed (namely a D port of 4WV1 is communicated with a C port, an S port is communicated with an E port), 4WV2 is closed (namely a D port of 4WV2 is communicated with the C port, and an S port is communicated with the E port), EXV1 is opened to a refrigeration initial opening degree, a fan of the heat exchanger runs, a compressor runs, and then the opening degree of an expansion valve EXV 1. The refrigerant circulation path is: compressor → 4WV2 → 4WV1 → heat exchanger → SV1 → EXV1 → SV4 → air conditioner side heat exchanger → 4WV1 → gas-liquid separator → compressor.
In the heating mode: the method comprises the steps of operating an air conditioner side water pump, operating a hot water side water pump, opening SV1, closing SV2, closing SV3, opening SV4, opening 4WV1 (namely, a D port of 4WV1 is communicated with an E port, and an S port is communicated with a C port), closing 4WV2 (namely, a D port of 4WV2 is communicated with a C port, and an S port is communicated with an E port), opening EXV1 to a heating initial opening degree, operating a fan of a heat exchanger, operating a compressor, and automatically adjusting the opening degree of an expansion valve EXV 1. The refrigerant circulation path is: compressor → 4WV2 → 4WV1 → air conditioner side heat exchanger → SV4 → accumulator → EXV1 → SV1 → heat exchanger → 4WV1 → gas-liquid separator → compressor.
In the water heating mode: the method comprises the steps of operating an air conditioner side water pump, operating a hot water side water pump, opening SV1, closing SV2, opening SV3, closing SV4, opening 4WV1 (namely, a D port of 4WV1 is communicated with an E port, and an S port is communicated with a C port), opening 4WV2 (namely, a D port of 4WV2 is communicated with the E port, and an S port is communicated with the C port), opening EXV1 to the initial opening degree of hot water making, operating a fan of a heat exchanger, operating a compressor, and automatically adjusting the opening degree of an expansion valve EXV 1. The refrigerant circulation path is: compressor → 4WV2 → hot water side heat exchanger → SV3 → accumulator → EXV1 → SV1 → heat exchanger → 4WV1 → gas-liquid separator → compressor.
In the heat recovery mode: the method comprises the steps of operating an air conditioner side water pump, operating a hot water side water pump, closing SV1, opening SV2, opening SV3, closing SV4, closing 4WV1 (namely, a D port of 4WV1 is communicated with a C port, and an S port is communicated with an E port), opening 4WV2 (namely, a D port of 4WV2 is communicated with an E port, and an S port is communicated with a C port), opening EXV1 to a heat recovery initial opening degree, stopping the operation of a fan of a heat exchanger, operating a compressor, and automatically adjusting the opening degree of an expansion valve EXV 1. The refrigerant circulation path is: compressor → 4WV2 → hot water side heat exchanger → SV3 → accumulator → EXV1 → SV2 → air conditioner side heat exchanger → 4WV1 → gas-liquid separator → compressor.
Standby mode: the compressor stops running, the fan of the heat exchanger stops running, and the refrigerant does not circulate.
The compound mode of the air conditioning unit comprises a summer compound mode and a winter compound mode. The summer compound mode comprises a refrigeration mode, a hot water heating mode, a heat recovery mode and a standby mode, and the modes can be automatically switched. The winter compound mode comprises a heating mode, a hot water making mode and a standby mode, and the modes can be automatically switched.
The air conditioning unit of the embodiment is in a summer composite mode or a winter composite mode.
The method for controlling the air conditioning unit in the compound mode specifically includes the following steps, which are shown in fig. 2.
And executing steps S11-S17 at set time intervals during the running process of the unit.
Step S11: the operating time of the compressor in the current operating mode is obtained.
Step S12: and judging whether the running time is more than or equal to the preset minimum running time.
If not, the process returns to step S11.
If yes, go to step S13.
And only when the running time of the compressor in the current running mode is more than or equal to the preset minimum running time, the downward execution is continued, so that the frequent starting and stopping of the compressor are avoided, and the running stability and reliability of the unit are further improved.
Step S13: acquiring actual inlet water temperature Tewi of the air conditioner side heat exchanger and preset target inlet water temperature TewidActual temperature Tt of hot water side tank, preset target tank temperature Ttd。
Step S14: according to Tewi, Tewid 、Tt、TtdAnd judging whether the operation mode needs to be switched or not.
If not, the operation mode does not need to be switched, the current operation mode is maintained, and the process returns to step S13.
If yes, the operation mode needs to be switched, and step S15 is executed.
In the present embodiment, when the unit is in summer, the combination is performedWhen in mode, the mode is judged whether Tewi is metd≤Tewi≤Tewid+ Ta or Ttd-Tb≤Tt≤TtdTo judge whether the operation mode needs to be switched.
If Tewi is satisfiedd≤Tewi≤Tewid+ Ta or Ttd-Tb≤Tt≤TtdNamely, the water inlet temperature Tewi is in a reasonable range and the refrigeration effect is better, or the water tank temperature Tt is in a reasonable range and the hot water making effect is better; namely, under the current operation mode, the refrigeration requirement of the air conditioner side or the hot water making requirement of the hot water side is met, and the operation mode does not need to be switched; otherwise, the operation mode needs to be switched if the refrigeration requirement and the heating water requirement are not met.
TewidThe value range is 10-15 ℃, and the adjustment can be carried out on a user interface according to different user requirements. TtdThe value range is 40-55 ℃, and the adjustment can be carried out on a user interface according to different user requirements.
Ta is return difference temperature of inlet water of the heat exchanger at the air conditioner side, and if the value is too small, the fluctuation of the temperature of the inlet water is easy to occur, the mode switching is frequent, and the compressor is frequently started and stopped; if the value is too large, the refrigerating effect is not obvious easily. In the embodiment, the value range of Ta is 2-5 ℃, which not only avoids frequent mode switching, but also ensures the refrigeration effect.
Tb is the return difference temperature of the hot water side water tank, and if the value is too small, the water temperature fluctuation of the water tank, frequent mode switching and frequent starting and stopping of the compressor are easy to occur; if the value is too large, the effect of making hot water is not obvious easily. In the embodiment, the value range of Tb is 3-5 ℃, so that not only is the mode prevented from being frequently switched, but also the hot water making effect is ensured.
In the present embodiment, when the unit is in the winter compound mode, whether Tewi is satisfied is determinedd≤Tewi≤Tewid+ Tc or Ttd-Td≤Tt≤TtdAnd judging whether the operation mode needs to be switched or not.
If Tewi is satisfiedd≤Tewi≤Tewid+ Tc or Ttd-Td≤Tt≤TtdNamely the water inlet temperature Tewi is in a reasonable range and the heating effectThe effect is better, or the water tank temperature Tt is in a reasonable range, and the hot water making effect is better; namely, under the current operation mode, the heating requirement of the air conditioner side or the heating requirement of the hot water side is met, and the operation mode does not need to be switched; otherwise, the operation mode needs to be switched if the heating requirement and the hot water requirement are not met.
TewidThe value range is 40-55 ℃, and the adjustment can be carried out on a user interface according to different user requirements. TtdThe value range is 40-55 ℃, and the adjustment can be carried out on a user interface according to different user requirements.
Tc is return difference temperature of inlet water of the heat exchanger at the air conditioner side, and if the value is too small, the fluctuation of the temperature of the inlet water, frequent mode switching and frequent starting and stopping of a compressor are easy to occur; if the value is too large, the heating effect is not obvious easily. In the embodiment, the value range of Tc is 2-5 ℃, which not only avoids the frequent mode switching, but also ensures the heating effect.
Td is the return difference temperature of the hot water side water tank, and if the value is too small, the water temperature fluctuation of the water tank, frequent mode switching and frequent starting and stopping of the compressor are easy to occur; if the value is too large, the effect of making hot water is not obvious easily. In this embodiment, Td has a value range of 3 ℃ to 5 ℃, which not only avoids frequent mode switching, but also ensures the effect of heating water.
Step S15: according to Tewi, Tewid 、Tt、TtdThe next operating mode is determined.
In the present embodiment, referring to fig. 3 and table one, when the unit is in the summer compound mode, the steps specifically include:
(1) if Tewi > Tewid+ Ta, and Tt < TtdTb, see a1 area a in fig. 3, that is, the intake water temperature Tewi is too high, the cooling effect is too poor, the tank temperature Tt is too low, the heating effect is too poor, and there are both cooling and heating needs, and then the next operation mode is determined as the heat recovery mode.
(2) If Tewi > Tewid+ Ta, and Tt > TtdReferring to region a2 in fig. 3, the inlet water temperature Tewi is too high and the cooling effect is too poor, while the tank temperature Tt is too high and the heating effect is too lowAnd if the water effect is too good, judging that the next operation mode is a refrigeration mode.
(3) If Tewi < TewidAnd Tt < TtdTb, see B1 in fig. 3, that is, if the inlet water temperature Tewi is too low and the cooling effect is too good, and if the tank temperature Tt is too low and the heating effect is too poor, the next operation mode is determined as the heating water mode.
(4) If Tewi < TewidAnd Tt > TtdReferring to a region B2 in fig. 3, if the inlet water temperature Tewi is too low and the cooling effect is too good, and the tank temperature Tt is too high and the heating effect is too good, it is determined that the next operation mode is the standby mode, thereby avoiding energy waste.
Through the design of this step, the next mode of operation is determined automatically in the compound mode in summer, guarantees refrigeration effect and system hot water effect to satisfy refrigeration demand and system hot water demand.
Table one, "1" indicates that operation is required; "0" means no run is required.
In this embodiment, referring to fig. 4 and table two, when the unit is in the winter compound mode, step S15 specifically includes:
(1) if Tewi > Tewid+ Tc and Tt < TtdTd, see region C1 in FIG. 4, that is, if the inlet water temperature Tewi is too high and the heating effect is too good, and if the tank temperature Tt is too low and the heating effect is too poor, the next operation mode is determined to be the heating water mode.
(2) If Tewi > Tewid+ Tc, and Tt > TtdReferring to a region C2 in fig. 4, if the inlet water temperature Tewi is too high and the heating effect is too good, and the tank temperature Tt is too high and the heating effect is too good, it is determined that the next operation mode is the standby mode, thereby avoiding energy waste.
(3) If Tewi < TewidAnd Tt < TtdTd, see region D1 in FIG. 4, i.e., too low intake water temperature Tewi, too poor heating effect, too low tank temperature Tt, too poor heating effect, existing heatingIf the heat demand has a hot water production demand, the next operation mode is determined to be the operation mode with the highest priority according to the preset priority rule.
In this embodiment, the preset priority rule is: the priority ranking from high to low is: heating mode, hot water heating mode and standby mode. That is, the heating mode has the highest priority, and when there is both a heating demand and a heating water demand, the next operation mode is determined as the heating mode. Therefore, when the heating demand and the heating water demand conflict, the heating demand is preferentially met, and the use experience of the user is improved. Of course, the user can adjust the priority of the operation mode according to actual requirements.
(4) If Tewi < TewidAnd Tt > TtdReferring to a region D2 in fig. 4, if the inlet water temperature Tewi is too low, the heating effect is too poor, and the tank temperature Tt is too high, the heating effect is too good, the next operation mode is determined as the heating mode.
Through the design of the step, the next operation mode is automatically determined in the winter compound mode, and the heating effect and the water heating effect are ensured so as to meet the heating requirement and the water heating requirement.
Table two, "1" indicates that operation is required; "0" means no run is required.
Of course, if the determined next operation mode is the same as the current operation mode, the unit maintains the current operation mode, and returns to step S13.
Step S16: and judging whether the change rate of the inlet water temperature of the air-conditioning side heat exchanger or the change rate of the water temperature of the hot water side water tank meets the switching condition.
If not, the switching condition is not satisfied, the current operation mode is maintained, and the process returns to step S13.
If yes, the switching condition is satisfied, and step S17 is executed.
The mode switching is only carried out when the water temperature change rate meets the switching condition, so that the large water temperature fluctuation is avoided, the frequent mode switching is avoided, and the running stability of the unit is ensured.
Water temperature change rate = (water temperature collected at current time t 2-water temperature collected at last time t 1)/(t 2-t 1).
When the water temperature rises, the water temperature change rate is positive; when the water temperature decreases, the water temperature change rate is negative. The positive water temperature rate of change is greater than the negative water temperature rate of change. Among the positive water temperature change rates, the water temperature change rate with a short time required to raise the unit temperature is larger than the water temperature change rate with a long time required. In the negative water temperature change rate, the water temperature change rate in which the time required to lower the unit temperature is long is larger than the water temperature change rate in which the time required to lower the unit temperature is short.
For example:
a, the time required for the water temperature to rise by 0.5 ℃ is 90s, namely the change rate of the water temperature is 0.5 ℃/90 s;
b. the time required for the water temperature to rise to 0.5 ℃ is 240s, namely the change rate of the water temperature is 0.5 ℃/240 s;
c. the water temperature does not change for a long time, and the water temperature change rate is 0;
d. the time required for the water temperature to fall by 0.5 ℃ is 360s, namely the water temperature change rate is-0.5 ℃/360 s;
e. the time required for the water temperature to fall by 0.5 ℃ is 120s, namely the water temperature change rate is-0.5 ℃/120 s;
f. the time required for the water temperature to fall by 0.5 ℃ is 30s, namely the water temperature change rate is-0.5 ℃/30 s.
The water temperature change rates in the above cases are arranged in order from large to small.
In this embodiment, when the unit is in the compound mode in summer, judge whether the temperature change rate of the temperature of the intake water of the heat exchanger on the air conditioner side or the temperature change rate of the water tank on the hot water side satisfies the switching condition, specifically include:
(1) when the current operation mode is a hot water making mode:
if the change rate of the water temperature of the hot water side water tank is larger than or equal to the first set change rate, the switching condition is met.
In the present embodiment, the first set rate of change = -0.5 ℃/360 s.
That is, the water temperature in the water tank is in a rising trend (the water temperature change rate is greater than 0) or is unchanged (the water temperature change rate is = 0) or is slowly decreased (the water temperature change rate is less than 0 at the rate of 0.5 ℃/360 s), and even if the water tank is switched to other modes, the water temperature in the water tank can still meet the hot water requirement of a user in a short period, so that the water tank can be switched to other modes to meet the switching condition.
(2) When the current operation mode is a refrigeration mode:
and if the change rate of the inlet water temperature of the air-conditioning side heat exchanger is less than or equal to a second set change rate, the switching condition is met.
In the present embodiment, the second set rate of change =0.5 ℃/240 s.
That is, at present, the temperature of the inlet water rises slowly (the water temperature change rate is more than 0 and less than or equal to 0.5 ℃/240 s) or does not change (the water temperature change rate = 0) or is in a descending trend (the water temperature change rate is less than 0), and even if the mode is switched to other modes, the temperature of the inlet water can still meet the refrigeration requirement of a user in a short period, so that the mode can be switched to other modes to meet the switching condition.
(3) When the current operation mode is a heat recovery mode:
and if the change rate of the water temperature of the hot water side water tank is larger than or equal to a first set change rate, or the change rate of the inlet water temperature of the air-conditioning side heat exchanger is smaller than or equal to a second set change rate, the switching condition is met.
That is, at present, the water temperature of the water tank is in an increasing trend or is unchanged or is slowly decreased, or the water temperature of inlet water of the air-conditioning side heat exchanger is slowly increased or is unchanged or is in a decreasing trend, and even if the water temperature is switched to other modes, the water heating requirement or the refrigerating requirement of a user can be still met in a short period.
(4) When the current operation mode is the standby mode: the switching condition is satisfied.
Therefore, only when the water temperature change rate meets the switching condition, the mode switching can be carried out, the effect of refrigerating or heating water is prevented from being influenced, and the mode is prevented from being frequently switched.
In this embodiment, when the unit is in the winter compound mode, it is determined whether the change rate of the inlet water temperature of the air-conditioning side heat exchanger or the change rate of the water temperature of the hot water side water tank satisfies the switching condition, which specifically includes:
(1) when the current operation mode is a hot water making mode:
if the change rate of the water temperature of the hot water side water tank is larger than or equal to the third set change rate, the switching condition is met.
In the present embodiment, the third set rate of change = -0.5 ℃/240 s.
That is, the water temperature in the water tank is in a rising trend (the water temperature change rate is greater than 0) or is unchanged (the water temperature change rate is = 0) or is slowly decreased (the water temperature change rate is less than 0 at the rate of 0.5 ℃/240 s), and even if the water tank is switched to other modes, the water temperature in the water tank can still meet the hot water requirement of a user in a short period of time, so that the water tank can be switched to other modes to meet the switching condition.
(2) When the current operation mode is a heating mode:
and if the change rate of the inlet water temperature of the air-conditioning side heat exchanger is larger than or equal to the fourth set change rate, the switching condition is met.
In the present embodiment, the fourth set rate of change = -0.5 ℃/360 s.
That is, the intake water temperature is in the rising trend (water temperature change rate > 0) or is unchanged (water temperature change rate = 0) or is slowly decreased (-0.5 ℃/360s ≤ water temperature change rate < 0), and even if the mode is switched to another mode, the intake water temperature can still meet the heating requirement of the user in a short period, so the mode can be switched to another mode to meet the switching condition.
(3) When the current operation mode is the standby mode: the switching condition is satisfied.
Therefore, only when the water temperature change rate meets the switching condition, the mode switching can be carried out, the heating or hot water heating effect is prevented from being influenced, and the mode is prevented from being frequently switched.
Step S17: and controlling the unit to switch to the next operation mode.
According to the air conditioning unit compound mode control method, the running time of a compressor in the current running mode is obtained; judging whether the running time is more than or equal to a preset minimum running time or not; if yes, acquiring the actual inlet water temperature Tewi of the air conditioner side heat exchanger and the preset target inlet water temperature TewidActual temperature Tt of hot water side water tank, preset target water tank temperatureTtd(ii) a According to Tewi, Tewid、Tt、TtdJudging whether the operation mode needs to be switched or not; if yes, then according to Tewi, Tewid、Tt、TtdDetermining a next operation mode; judging whether the change rate of the inlet water temperature of the air-conditioning side heat exchanger or the change rate of the water temperature of the hot water side water tank meets the switching condition or not; if so, controlling the unit to switch to the next operation mode; the control method of this embodiment, when compressor operating duration, air conditioner side heat exchanger temperature of intaking, hot water side water tank temperature, temperature change rate all satisfy the condition, just carry out the mode switch, control accurately, avoid the mode switch frequent, avoid the compressor to frequently open and stop, guarantee unit operating stability, improve user and use experience.
The air conditioning unit compound mode control method of the embodiment realizes automatic switching between the operation modes, simultaneously ensures the refrigeration/heating effect of the air conditioning side and the hot water heating effect of the hot water side, meets the refrigeration/heating requirements of the air conditioning side user and the hot water heating requirements of the hot water side user, ensures efficient, energy-saving and stable operation of the unit, and improves the user experience.
When the unit is in the summer compound mode, after the unit is powered on and before the unit is started, the control method further comprises the following steps:
(1) acquiring actual inlet water temperature Tewi of the air conditioner side heat exchanger and preset target inlet water temperature TewidActual water inlet temperature Tt of hot water side heat exchanger, preset target water tank temperature Ttd。
(2) Calculating air conditioner side starting temperature difference DTAir-conditioning side=Tewi-Tewid(ii) a Calculating hot water side starting temperature difference DTHot water side=Ttd-Tt。
(3) If DTAir-conditioning sideMore than or equal to the preset temperature difference of the air conditioner side target starting, and DTHot water sideIf the target starting temperature difference is larger than or equal to the preset hot water side target starting temperature difference, starting and operating the unit in a heat recovery mode;
if DTAir-conditioning sideMore than or equal to the preset temperature difference of the air conditioner side target starting, and DTHot water sideIf the target starting temperature difference is less than the preset hot water side target starting temperature difference, the unit is started to operate in a refrigeration mode;
if DTAir-conditioning side< preset air conditioner side target starting temperature difference, and DTHot water sideIf the target starting temperature difference is larger than or equal to the preset hot water side target starting temperature difference, starting the unit to operate in a hot water heating mode;
if DTAir-conditioning side< preset air conditioner side target starting temperature difference, and DTHot water sideIf the target starting temperature difference is less than the preset hot water side target starting temperature difference, the unit is in standby.
The starting mode is determined by judging the starting temperature difference before the unit is started, so that the proper running mode is selected to start and run, the refrigeration requirement and the heating water requirement of a user are met as soon as possible, and the user use experience is improved. In the embodiment, the target starting temperature difference of the air conditioner side is more than or equal to 2, and the target starting temperature difference of the hot water side is more than or equal to 2. Of course, the user can set the setting according to actual requirements.
When the unit is in the winter compound mode, after the unit is powered on and before the unit is started, the control method further comprises the following steps:
(1) acquiring actual inlet water temperature Tewi of the air conditioner side heat exchanger and preset target inlet water temperature TewidActual water inlet temperature Tt of hot water side heat exchanger, preset target water tank temperature Ttd。
(2) Calculating air conditioner side starting temperature difference DTAir-conditioning side= Tewid-Tewi; calculating hot water side starting temperature difference DTHot water side=Ttd-Tt。
(3) If DTAir-conditioning sideThe unit is started to operate in a heating mode if the preset target starting temperature difference of the air conditioner side is greater than or equal to the preset target starting temperature difference;
if DTAir-conditioning side< preset air conditioner side target starting temperature difference, and DTHot water sideIf the target starting temperature difference is larger than or equal to the preset hot water side target starting temperature difference, starting the unit to operate in a hot water heating mode;
if DTAir-conditioning side< preset air conditioner side target starting temperature difference, and DTHot water sideIf the target starting temperature difference is less than the preset hot water side target starting temperature difference, the unit is in standby.
The starting mode is determined by judging the starting temperature difference before the unit is started, so that the proper operation mode is selected to start and operate, the heating requirement and the water heating requirement are met as soon as possible, and the user experience is improved. In the embodiment, the target starting temperature difference of the air conditioner side is more than or equal to 2, and the target starting temperature difference of the hot water side is more than or equal to 2. Of course, the user can set the setting according to actual requirements.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. A compound mode control method of an air conditioning unit is characterized by comprising the following steps: the composite mode comprises a summer composite mode and a winter composite mode; the summer compound mode comprises a refrigeration mode, a hot water heating mode, a heat recovery mode and a standby mode; the winter compound mode comprises a heating mode, a hot water heating mode and a standby mode; when the unit is in a summer composite mode or a winter composite mode, the control method comprises the following steps:
acquiring the running time of the compressor in the current running mode;
judging whether the running time is more than or equal to a preset minimum running time or not;
if yes, acquiring the actual inlet water temperature Tewi of the air conditioner side heat exchanger and the preset target inlet water temperature TewidActual temperature Tt of hot water side tank, preset target tank temperature Ttd(ii) a According to Tewi, Tewid 、Tt、TtdJudging whether the operation mode needs to be switched or not;
if yes, then according to Tewi, Tewid 、Tt、TtdDetermining a next operation mode; when the unit is in winter compound mode, the Tewi and Tewid 、Tt、TtdDetermining the next operation mode specifically comprises:
if Tewi > Tewid+ Tc and Tt < TtdTd, then the next run is determinedThe mode is a hot water making mode;
if Tewi > Tewid+ Tc, and Tt > TtdIf yes, judging the next operation mode as a standby mode;
if Tewi < TewidAnd Tt < TtdTd, determining the next operation mode as the operation mode with the highest priority according to a preset priority rule;
if Tewi < TewidAnd Tt > TtdIf so, judging that the next operation mode is a heating mode;
judging whether the change rate of the inlet water temperature of the air-conditioning side heat exchanger or the change rate of the water temperature of the hot water side water tank meets the switching condition or not;
and if so, controlling the unit to switch to the next operation mode.
2. The control method according to claim 1, characterized in that: when the unit is in summer composite mode, the Tewi and Tewid 、Tt、TtdJudging whether the operation mode needs to be switched or not, specifically comprising the following steps:
judging whether Tewi is satisfied or notd≤Tewi≤Tewid+ Ta or Ttd-Tb≤Tt≤Ttd；
If so, the operation mode does not need to be switched;
if not, the operation mode needs to be switched;
wherein Ta and Tb are return difference temperatures.
3. The control method according to claim 2, characterized in that: when the unit is in summer composite mode, the Tewi and Tewid 、Tt、TtdDetermining the next operation mode specifically comprises:
if Tewi > Tewid+ Ta, and Tt < TtdTb, determining the next operation mode as a heat recovery mode;
if Tewi > Tewid+ Ta, and Tt > TtdIf yes, judging that the next operation mode is a refrigeration mode;
if Tewi < TewidAnd Tt < Ttd-Tb, thenDetermining that the next operation mode is a hot water making mode;
if Tewi < TewidAnd Tt > TtdThen the next operation mode is determined as the standby mode.
4. The control method according to claim 1, characterized in that: when the unit is in the compound mode in summer, judge whether the temperature change rate of the temperature of intaking water of air conditioner side heat exchanger or the temperature change rate of hot water side water tank satisfies the switching condition, specifically include:
(1) when the current operation mode is a hot water making mode:
if the change rate of the water temperature of the hot water side water tank is larger than or equal to a first set change rate, the switching condition is met;
(2) when the current operation mode is a refrigeration mode:
if the change rate of the inlet water temperature of the air-conditioning side heat exchanger is less than or equal to a second set change rate, the switching condition is met;
(3) when the current operation mode is a heat recovery mode:
if the change rate of the water temperature of the hot water side water tank is larger than or equal to a first set change rate, or the change rate of the inlet water temperature of the air-conditioning side heat exchanger is smaller than or equal to a second set change rate, the switching condition is met;
(4) when the current operation mode is the standby mode: the switching condition is satisfied;
wherein,
water temperature change rate = (water temperature collected at current time t 2-water temperature collected at last time t 1)/(t 2-t 1).
5. The control method according to claim 1, characterized in that: when the unit is in the summer compound mode, after the unit is powered on and before the unit is started, the control method further comprises the following steps:
(1) acquiring actual inlet water temperature Tewi of the air conditioner side heat exchanger and preset target inlet water temperature TewidActual water inlet temperature Tt of hot water side heat exchanger, preset target water tank temperature Ttd；
(2) Calculating air conditioner side starting temperature difference DTAir-conditioning side=Tewi-Tewid；
Calculating hot water side starting temperature difference DTHot water side=Ttd-Tt；
（3）
If DTAir-conditioning sideMore than or equal to the preset temperature difference of the air conditioner side target starting, and DTHot water sideIf the target starting temperature difference is larger than or equal to the preset hot water side target starting temperature difference, starting and operating the unit in a heat recovery mode;
if DTAir-conditioning sideMore than or equal to the preset temperature difference of the air conditioner side target starting, and DTHot water sideIf the target starting temperature difference is less than the preset hot water side target starting temperature difference, the unit is started to operate in a refrigeration mode;
if DTAir-conditioning side< preset air conditioner side target starting temperature difference, and DTHot water sideIf the target starting temperature difference is larger than or equal to the preset hot water side target starting temperature difference, starting the unit to operate in a hot water heating mode;
if DTAir-conditioning side< preset air conditioner side target starting temperature difference, and DTHot water sideIf the target starting temperature difference is less than the preset hot water side target starting temperature difference, the unit is in standby.
6. The control method according to claim 1, characterized in that: when the unit is in winter compound mode, the Tewi and Tewid 、Tt、TtdJudging whether the operation mode needs to be switched or not, specifically comprising the following steps:
judging whether Tewi is satisfied or notd≤Tewi≤Tewid+ Tc or Ttd-Td≤Tt≤Ttd；
If so, the operation mode does not need to be switched;
if not, the operation mode needs to be switched;
wherein Tc and Td are return difference temperatures.
7. The control method according to claim 6, characterized in that: the preset priority rule is as follows: the priority ranking from high to low is: heating mode, hot water heating mode and standby mode.
8. The control method according to claim 1, characterized in that: when the unit is in winter compound mode, whether the temperature change rate of the water of intaking of judgement air conditioner side heat exchanger or the temperature change rate of hot water side water tank satisfy the switching condition specifically includes:
(1) when the current operation mode is a hot water making mode:
if the change rate of the water temperature of the hot water side water tank is larger than or equal to a third set change rate, the switching condition is met;
(2) when the current operation mode is a heating mode:
if the change rate of the inlet water temperature of the air-conditioning side heat exchanger is larger than or equal to the fourth set change rate, the switching condition is met;
(3) when the current operation mode is the standby mode: the switching condition is satisfied;
wherein,
water temperature change rate = (water temperature collected at current time t 2-water temperature collected at last time t 1)/(t 2-t 1).
9. The control method according to claim 1, characterized in that: when the unit is in the winter compound mode, after the unit is powered on and before the unit is started, the control method further comprises the following steps:
(1) acquiring actual inlet water temperature Tewi of the air conditioner side heat exchanger and preset target inlet water temperature TewidActual water inlet temperature Tt of hot water side heat exchanger, preset target water tank temperature Ttd；
(2) Calculating air conditioner side starting temperature difference DTAir-conditioning side= Tewid - Tewi；
Calculating hot water side starting temperature difference DTHot water side=Ttd-Tt；
（3）
If DTAir-conditioning sideThe unit is started to operate in a heating mode if the preset target starting temperature difference of the air conditioner side is greater than or equal to the preset target starting temperature difference;
if DTAir-conditioning side< preset air conditioner side target starting temperature difference, and DTHot water sideIf the target starting temperature difference is larger than or equal to the preset hot water side target starting temperature difference, starting the unit to operate in a hot water heating mode;
if DTAir-conditioning side< Preset air conditioner side target StartTemperature difference, and DTHot water sideIf the target starting temperature difference is less than the preset hot water side target starting temperature difference, the unit is in standby.
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| CN110873400A (en) * | 2018-08-31 | 2020-03-10 | 青岛海尔空调器有限总公司 | Air conditioner and self-cleaning control method thereof |
| CN109764500B (en) * | 2018-12-29 | 2023-06-20 | 珠海格力电器股份有限公司 | Control method and device for solving unit operation mode conflict and unit |
| CN113124531A (en) * | 2019-12-30 | 2021-07-16 | 青岛海尔空调电子有限公司 | Control method for automatically switching operation modes of water chilling unit |
| CN112648714B (en) * | 2020-12-09 | 2022-04-05 | 广东西屋康达空调有限公司 | Constant temperature control method and system for air-cooled modular unit |
| CN113418329A (en) * | 2021-05-28 | 2021-09-21 | 青岛海尔空调电子有限公司 | Control method of refrigeration and freezing unit and refrigeration and freezing unit |
| CN114017903B (en) * | 2021-10-29 | 2023-03-28 | 青岛海信日立空调***有限公司 | Floor heating and air conditioning integrated machine |
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Effective date of registration: 20201202 Address after: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Applicant after: QINGDAO HAIER AIR-CONDITIONING ELECTRONIC Co.,Ltd. Applicant after: Haier Smart Home Co., Ltd. Address before: 266101 Haier Industrial Park, Haier Road, Laoshan District, Shandong, Qingdao, China Applicant before: QINGDAO HAIER AIR-CONDITIONING ELECTRONIC Co.,Ltd. |
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