CN116734398A - Control method of air conditioning system - Google Patents
Control method of air conditioning system Download PDFInfo
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- CN116734398A CN116734398A CN202310661426.0A CN202310661426A CN116734398A CN 116734398 A CN116734398 A CN 116734398A CN 202310661426 A CN202310661426 A CN 202310661426A CN 116734398 A CN116734398 A CN 116734398A
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- water
- air conditioning
- heat exchanger
- interface
- conditioning system
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 200
- 238000000034 method Methods 0.000 title claims abstract description 45
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 441
- 239000003507 refrigerant Substances 0.000 claims abstract description 106
- 239000008236 heating water Substances 0.000 claims abstract description 77
- 238000010438 heat treatment Methods 0.000 claims description 67
- 238000010257 thawing Methods 0.000 claims description 60
- 230000003247 decreasing effect Effects 0.000 claims description 14
- 230000005494 condensation Effects 0.000 claims description 13
- 238000009833 condensation Methods 0.000 claims description 13
- 230000008859 change Effects 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000001174 ascending effect Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 16
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 90
- 229910052731 fluorine Inorganic materials 0.000 description 90
- 239000011737 fluorine Substances 0.000 description 90
- 230000002829 reductive effect Effects 0.000 description 21
- 238000004891 communication Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 8
- 238000001514 detection method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000011144 upstream manufacturing Methods 0.000 description 6
- 238000012806 monitoring device Methods 0.000 description 5
- 239000002826 coolant Substances 0.000 description 4
- 238000005336 cracking Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000003673 groundwater Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000011897 real-time detection Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000012549 training Methods 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Classifications
-
- 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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/41—Defrosting; Preventing freezing
- F24F11/42—Defrosting; Preventing freezing of outdoor units
-
- 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
-
- 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
-
- 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
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
-
- 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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
-
- 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
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
-
- 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
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Human Computer Interaction (AREA)
- Thermal Sciences (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioners, and particularly provides a control method of an air conditioning system, which aims to solve the problem that the existing air conditioning system cannot monitor the water inflow of a refrigerant system in time. Therefore, the control method of the air conditioning system can judge whether the flow of the floor heating water flowing through the heat exchanger is lower than a preset value, if so, judge whether the reason for the flow lower than the preset value is the water inlet of the refrigerant system, and send out the reminding of the water inlet of the refrigerant system when the reason is determined to be the water inlet of the refrigerant system. According to the invention, the reason for the water flow is judged in time when the water flow is lower than the preset value, and the reminding is sent out when the reason is that the refrigerant system is in water, so that the problems that the air conditioning system is damaged due to the fact that the refrigerant system is in water, such as an expansion valve, and the like, and the compressor is in liquid impact are effectively avoided, and the safety and stability of the air conditioning system are improved.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly provides a control method of an air conditioning system.
Background
When the current air conditioning system of the water in the day and the fluorine is used for defrosting the condenser in the outdoor unit through the defrosting mode, fluorine passing through the condenser can absorb cold energy when the frost is melted, so that the temperature of the fluorine can be reduced to below zero, and the fluorine reduced to below zero exchanges heat with water in the plate heat exchanger when flowing through the plate heat exchanger, and the temperature of the fluorine is increased by the water. However, due to the long-time operation of the air conditioning system, the water path of the air conditioning system may have a low flow rate due to the accumulation of impurities, thereby causing the water in the heat exchanger to have a low flow rate. In the process of heat exchange between fluorine below zero and low-flow water in the plate heat exchanger, the low-flow water in the plate heat exchanger can be frozen, even the plate heat exchanger can be frozen and cracked, so that the water enters a refrigerant system, the heat exchange capacity of the inner and outer machines is greatly reduced, parts such as expansion valves of the inner and outer machines are damaged, and even the problems of liquid impact of a compressor and the like occur.
However, the existing related technology generally cannot find that the refrigerant system is in water in time, and only when the heat exchange capability of the air conditioning system is seriously affected, parts are damaged or even liquid impact occurs, whether the refrigerant system is in water is analyzed, and at the moment, the air conditioning system is seriously affected, and the air conditioning system can be normally used even after the parts are overhauled or replaced, so that the user experience is poor.
Accordingly, there is a need in the art for a new solution to the above-mentioned problems.
Disclosure of Invention
In order to solve the above problems in the prior art, that is, in order to solve the technical problem that water cannot be detected and early warning cannot be performed on the condition that water enters a refrigerant system in the prior art, the invention provides a control method of an air conditioning system, the air conditioning system comprises a compressor, a condenser, a four-way valve, a heat exchanger and a floor heating component, a refrigerant can circulate among the compressor, the condenser and the heat exchanger, and floor heating water of the floor heating component can exchange heat with the refrigerant flowing through the heat exchanger at the heat exchanger, the control method of the air conditioning system comprises: judging whether the flow of the ground heating water flowing through the heat exchanger is lower than a preset value, if so, judging whether the reason for the flow lower than the preset value is the water inlet of the refrigerant system, and when the reason is determined to be the water inlet of the refrigerant system, sending out the prompt of the water inlet of the refrigerant system.
Under the condition of adopting the technical scheme, by monitoring whether the flow of the ground heating water in the heat exchanger is lower than a preset value, judging whether the reason for causing the flow to be lower than the preset value is coolant system water inlet or not when the flow is lower than the preset value, and sending out a prompt of coolant system water inlet when the reason for causing the flow to be lower than the preset value is determined to be coolant system water inlet, thereby prompting a user in time when the coolant system water inlet, and timely shutting down the air conditioning system according to the prompt and connecting after-sales personnel in parallel so as to take corresponding countermeasures, avoiding the problems of damage of parts such as an expansion valve of the air conditioning system, occurrence of liquid impact of a compressor and the like, and improving the safety and stability of the air conditioning system.
In the preferred technical solution of the control method of an air conditioning system, the step of determining whether the reason for causing the flow rate to be lower than the preset value is that the refrigerant system is water inlet further includes: and acquiring the operation parameters of the air conditioning system, and judging whether the reason is water inflow of the refrigerant system or not based on the operation parameters of the air conditioning system.
Under the condition of adopting the technical scheme, whether the reason for leading to the water flow being lower than the preset value is that the refrigerant system is in water can be judged according to the operation parameters of the air conditioning system, whether the reason for leading to the water flow being lower than the preset value is that the refrigerant system is in water can be judged only by detecting the operation parameters of the air conditioning system in the detection process, and an additional detection device is not required to be configured for detecting the air conditioning system, so that the detection is more convenient, and the use experience of a user is further improved.
In a preferred embodiment of the control method of an air conditioning system, the operation parameters of the air conditioning system include a suction pressure and a discharge pressure of the compressor, and the step of determining whether the cause is the inflow of water to the refrigerant system based on the operation parameters of the air conditioning system further includes: and judging the change trend of the suction pressure and the discharge pressure of the compressor, and determining that the source is the water inlet of the refrigerant system if the suction pressure and the discharge pressure are both in a decreasing trend.
Under the condition of adopting the technical scheme, when the heat exchanger is cracked, water can be leaked into a refrigerant system. After water leaks into the refrigerant system, the content of the refrigerant in the refrigerant system is reduced, so that the suction pressure and the discharge pressure of the compressor are gradually reduced. Based on the method, whether the reason that the flow is lower than the preset value is that the refrigerant system is in water or not can be judged by detecting the change conditions of the suction pressure and the discharge pressure of the compressor, and the water inlet of the refrigerant system can be judged without waiting for the serious influence on the heat exchange capability of the air conditioning system or the damage of parts or even the occurrence of liquid impact. In other words, the invention can judge whether the refrigerant system is in water or not in time by judging the trend of the variation of the suction pressure and the discharge pressure of the compressor, thereby avoiding the condition that the air conditioning system is further damaged due to the water inlet of the refrigerant system.
In the above preferred technical solution of the control method of an air conditioning system, the step of determining whether the cause is the water inlet of the refrigerant system based on the operation parameter of the air conditioning system is further performed when the operation parameter of the air conditioning system is a defrosting cycle in a last operation defrosting mode of the air conditioning system: judging whether the defrosting period of the air conditioning system in the last defrosting mode is smaller than a preset defrosting period, and if the defrosting period is smaller than the preset defrosting period, determining that the water is fed into the refrigerant system.
Under the condition of adopting the technical scheme, comparing the detected defrosting period of the last defrosting mode of the air conditioning system with a preset defrosting period, and judging whether water enters the refrigerant system according to a comparison result. Since this will cause the frosting speed of the condenser surface to become faster if water is supplied into the refrigerant system of the air conditioning system, which will cause the frequency of defrosting of the air conditioning system to increase and the defrosting cycle to become smaller, it is indicated that water is supplied into the refrigerant system of the air conditioning system when it is detected that the defrosting cycle of the air conditioning system is smaller than the preset defrosting cycle. Based on the method, whether the reason for low flow is water inflow in the refrigerant system can be accurately judged by detecting the defrosting period of the air conditioning system in the last defrosting mode, and whether the refrigerant system is water inflow can be judged without waiting until the heat exchange capacity of the air conditioning system is seriously influenced or parts are damaged or even liquid impact occurs. In other words, the invention can judge whether the refrigerant system is in water or not in time by judging the defrosting period when the air conditioning system operates in the defrosting mode last time, thereby avoiding the condition that the air conditioning system is further damaged due to the water inlet of the refrigerant system.
In a preferred technical solution of the control method of an air conditioning system, the air conditioning system further includes a water pump, the water pump is configured to circulate ground heating water between the ground heating assembly and the heat exchanger, the operation parameters of the air conditioning system further include the operation parameters of the water pump, and the step of determining whether the cause is the inflow of water of the refrigerant system based on the operation parameters of the air conditioning system further includes: and determining the running state of the water pump based on the running parameters of the water pump, and judging whether the reason is the water inlet of the refrigerant system based on the running state.
In a preferred technical solution of the control method of an air conditioning system, the step of determining whether the cause is water intake of the refrigerant system based on the operation state further includes: if the water pump is in an abnormal running state, determining that the reason is not the water inlet of the refrigerant system, if the water pump is in the normal running state, acquiring the water inlet pressure P1 and the water outlet pressure P2 of the heat exchanger in a preset time period, and further judging whether the reason is the water inlet of the refrigerant system based on the change trend of the water inlet pressure P1 and the water outlet pressure P2.
Under the condition of adopting the technical scheme, if the water pump is detected to be in an abnormal running state, the reason that the flow is lower than the preset value is indicated to be caused by the failure of the water pump, and not caused by the water entering the refrigerant system. If the water pump is in a normal running state, whether the refrigerant system is fed with water is further judged according to the change trend of the water inlet pressure P1 and the water outlet pressure P2 of the heat exchanger. Therefore, the invention can judge whether the refrigerant system is in water or not in time through the running state of the water pump and the change trend of the water inlet pressure and the water outlet pressure of the heat exchanger, thereby avoiding the condition that the air conditioning system is further damaged due to the water inlet of the refrigerant system and improving the use experience of users.
In the preferable technical scheme of the control method of the air conditioning system, when the reason is determined not to be that the refrigerant system is water inlet or after, a prompt for overhauling the water pump is sent.
In the preferred technical solution of the control method of an air conditioning system, the water pump is a constant-frequency water pump, the floor heating assembly is configured with a water tank, the water tank is used for replenishing floor heating water to the floor heating assembly, and the step of judging whether the reason is the inflow of the refrigerant system based on the change trend of the inflow pressure P1 and the outflow pressure P2 further includes: if the water inlet pressure P1 and the water outlet pressure P2 are both in a decreasing trend or both in an increasing trend, determining that the reason is not water inlet of the refrigerant system, and determining that the reason is blockage of the floor heating component, if the water inlet pressure P1 is in an increasing trend and the water outlet pressure P2 is in a decreasing trend, determining that the reason is not water inlet of the refrigerant system, and determining that the reason is blockage of the heat exchanger, and if the water inlet pressure P1 is unchanged and the water outlet pressure P2 is in a decreasing trend, determining that the reason is water inlet of the refrigerant system.
Under the condition of adopting the technical scheme, the constant-frequency water pump is arranged between the heat exchanger and the floor heating assembly, the water tank for supplementing floor heating water to the floor heating assembly is further arranged in the floor heating assembly, the water tank is arranged at the upstream of the constant-frequency water pump, and the floor heating water is supplemented to the floor heating assembly through the water tank, so that the water level in the floor heating assembly can be kept unchanged by the water tank in a preset time period taking cracking as starting time, and further, the water level in the floor heating assembly can be kept unchanged by the water tank based on the characteristic of fixed rotating speed of the constant-frequency water pump, even if the heat exchanger cracks, the water pressure at the water inlet of the constant-frequency water pump can be kept unchanged, and therefore, whether the reason for leading the flow to be lower than the preset value is that the floor heating assembly is blocked, the heat exchanger is blocked or the refrigerant system is fed can be judged accurately, the reason for leading the flow to be lower than the preset value can be rapidly overhauled according to the judging result, and the use experience of a user is improved.
In a preferred technical solution of the control method of an air conditioning system, the control method further includes: and sending out a warning of the blockage of the floor heating assembly when the blockage of the floor heating assembly is determined or after the blockage of the floor heating assembly is determined, and sending out a warning of overhauling the heat exchanger when the blockage of the heat exchanger is determined or after the blockage of the heat exchanger is determined.
In a preferred technical solution of the control method of an air conditioning system, the four-way valve has four interfaces, namely an e interface, a d interface, a c interface and an s interface, the compressor has a first interface and a second interface, the condenser has a third interface and a fourth interface, the heat exchanger has a fifth interface, a sixth interface, a seventh interface and an eighth interface, the first interface is connected with the d interface, the third interface is connected with the eighth interface, the fourth interface is connected with the c interface, the seventh interface is connected with the e interface, the second interface is connected with the s interface, the water outlet of the floor heating assembly is connected with the fifth interface, the water inlet of the floor heating assembly is connected with the sixth interface, and the step of judging whether the flow of the floor heating water flowing through the heat exchanger is lower than a preset value further includes: acquiring the water inlet temperature Tw of ground heating water entering the heat exchanger through the fifth interface 1 Obtaining the outlet water temperature Tw of the ground heating water flowing out of the heat exchanger through the sixth interface 2 Acquiring the condensing temperature Pdt of the refrigerant at the downstream side of the compressor, if Tw 2 -Tw 1 ≥△T 1 And Pdt-Tw 2 ≤△T 2 If the duration of the state is greater than or equal to the first preset time T1, determining that the flow is lower than the preset value, wherein DeltaT 1 Is a first threshold value, deltaT 2 Is a first threshold value and/or obtains the inlet water temperature Tw of the ground heating water entering the heat exchanger through the fifth interface 1 The outlet water temperature Tw of the ground heating water flowing out of the heat exchanger through the sixth interface 2 Acquiring the ambient temperature T Ring(s) Acquiring the refrigerant temperature Tf at the eighth interface 1 Acquiring the refrigerant temperature Tf at the seventh interface 2 If Tw 2 -Tw 1 ≤△T 3 、|Tw 1 -T Ring(s) |≤△T 4 、|Tw 2 -T Ring(s) |≤△T 5 And Tf 1 -Tf 2 ≤△T 6 And the duration of the stateGreater than or equal to a second preset time t 2 Determining that the flow is below the preset value, wherein DeltaT 3 Is a third threshold value, deltaT 4 Is a fourth threshold value, deltaT 5 Is a fifth threshold value, deltaT 6 Is the sixth threshold.
Under the condition of adopting the technical scheme, the water inlet temperature Tw of the heat exchanger is detected 1 Water outlet temperature Tw 2 And condensing temperature of the compressor, and/or by detecting inlet water temperature Tw of the heat exchanger 1 Water outlet temperature Tw 2 Ambient temperature T Ring(s) Refrigerant temperature Tf 1 And refrigerant temperature Tf 2 The flow rate of the ground heating water flowing through the heat exchanger can be judged by only detecting the operation parameters of the air conditioning system, and the flow rate of the water flowing through the heat exchanger can be monitored by detecting the operation parameters of the air conditioning system without independently configuring flow detection equipment.
Drawings
The control method of the air conditioning system of the present invention will be described below by taking a ceiling-air-conditioning system as an example with reference to the accompanying drawings. In the accompanying drawings:
FIG. 1 is a schematic diagram of a water air conditioning system according to an embodiment of the present invention;
fig. 2 is a detailed view of the outdoor side of the solar-to-earth water air conditioning system according to one embodiment of the present invention;
FIG. 3 is a general flow chart of a control method of a water air conditioning system according to an embodiment of the present invention;
fig. 4 is a block diagram of the inflow temperature Tw of ground heating water based on a heat exchanger when the air conditioning system for ground water with fluoride according to an embodiment of the present invention is operated in a heating mode 1 Water outlet temperature Tw 2 And a control flow chart for determining whether the flow rate of the floor heating water of the heat exchanger is lower than a preset value according to the condensation temperature Pdt of the refrigerant at the downstream side of the compressor;
FIG. 5 is a block diagram of the intake of ground heating water based on a heat exchanger when the ceiling-fluorine-and-ground-water air conditioning system of an embodiment of the present invention is operating in a heating modeTemperature Tw 1 Water outlet temperature Tw 2 Ambient temperature T Ring(s) Refrigerant temperature Tf 1 And refrigerant temperature Tf 2 A control flow chart for determining whether the flow of the floor heating water of the heat exchanger is lower than a preset value;
FIG. 6 is a control flow chart of a water air conditioning system for a water supply system for a fluorine system according to an embodiment of the present invention, wherein the control flow chart is used for judging whether the reason is the water supply of the fluorine system based on the operation parameters of the water air conditioning system;
FIG. 7 is a flow chart of a control of the air conditioning system for water intake of a fluorine system according to an embodiment of the present invention, wherein the flow chart is used for judging whether the reason is the water intake of the fluorine system based on the suction pressure Ps and the discharge pressure Pd of the compressor;
FIG. 8 shows an embodiment of the present invention of a water air conditioning system based on the last time of the air conditioning system judging whether the defrosting period is a control flow chart of water inflow of the fluorine system or not when the defrosting mode is operated;
FIG. 9 is a control flow chart of a water air conditioning system for water supply of a fluorine system according to an embodiment of the present invention, wherein the control flow chart is used for judging whether the reason is the water supply of the fluorine system based on the operation parameters of the water pump;
fig. 10 is a control flow chart of the water air conditioning system for the water supply of the fluorine system according to an embodiment of the present invention, wherein the control flow chart is used for judging whether the reason is the water supply of the fluorine system based on the operation state of the water pump, the water supply pressure P1 of the heat exchanger and the water outlet pressure P2 of the heat exchanger.
List of reference numerals:
1. an air conditioning system; 11. an outdoor unit; 111. a compressor; 1111. a first interface; 1112. a second interface; 1113. a suction pressure sensor; 1114. an exhaust pressure sensor; 1115. a throttle device; 112. a plate heat exchanger; 1121. a fifth interface; 1122. a sixth interface; 1123. a seventh interface; 1124. an eighth interface; 1125. a water inlet temperature sensor; 1126. a water inlet pressure sensor; 1127. a water outlet temperature sensor; 1128. a water outlet pressure sensor; 1129. a first fluorine inlet temperature sensor; 11210. a fluorine outlet temperature sensor; 113. a condenser; 1131. a third interface; 1132. a fourth interface; 1133. a defrost cycle sensor; 1134. an outdoor temperature sensor; 114. a four-way reversing valve 12 and a floor heating assembly; 121. a floor heating pipeline; 122. a water pump; 123. a water tank; 13. an indoor unit; 131. an indoor heat exchanger.
Detailed Description
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention. Those skilled in the art can make adjustments as needed to suit a particular application.
It should be noted that, in the description of the present invention, terms such as "inner", "outer", and the like refer to directions or positional relationships based on directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," through "eighth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
The prior art has the problem that the water inlet of a refrigerant system cannot be timely monitored. Therefore, when the flow of the floor heating water flowing through the heat exchanger is lower than the preset value, the air conditioning system judges whether the reason for the flow lower than the preset value is the water inlet of the refrigerant system, and when the reason is determined to be the water inlet of the refrigerant system, the air conditioning system sends out the reminding of the water inlet of the refrigerant system, so that a user can be timely reminded when the refrigerant system is water inlet, and the user can avoid the problems of damage to parts such as an expansion valve of the air conditioning system, occurrence of liquid impact of a compressor and the like by adopting corresponding countermeasures according to the reminding, so that the safety and stability of the air conditioning system can be effectively improved.
Referring first to fig. 1 and 2, the air conditioning system 1 includes an indoor unit 13 and an outdoor unit 11, and a floor heating assembly 12, the outdoor unit 11 mainly includes a compressor 111, an outdoor fan (not shown), a condenser 113, and a plate heat exchanger 112, the indoor unit 13 mainly includes an indoor heat exchanger 131, and the floor heating assembly 12 includes a floor heating pipe 121 and a water pump 122. The compressor 111 has a first interface 1111 and a second interface 1112, the condenser 113 has a third interface 1131 and a fourth interface 1132, the plate heat exchanger 112 has a fifth interface 1121, a sixth interface 1122, a seventh interface 1123 and an eighth interface 1124, and in the actual application process of the present application, a four-way reversing valve 114 is disposed in the freon circulation loop, and the four-way reversing valve 114 has an e interface, a c interface, a d interface and an s interface, so that the air conditioning system 1 can switch between a heating mode and a defrosting mode in winter. The first interface 1111 is connected to the d interface, the third interface 1131 is connected to the eighth interface 1124, the fourth interface 1132 is connected to the c interface, the seventh interface 1123 is connected to the e interface, and the second interface 1112 is connected to the s interface, so that freon circulates among the compressor 111, the condenser 113, and the plate heat exchanger 112. The water outlet of the floor heating assembly 12 is connected to the fifth interface 1121 and the water inlet of the floor heating assembly 12 is connected to the sixth interface 1122 so that a water circulation loop is formed between the floor heating assembly 12 and the plate heat exchanger 112. Specifically, when the air conditioning system 1 is in the heating mode, the high-temperature and high-pressure gaseous freon from the compressor 111 enters the four-way reversing valve 114 through the d interface, is discharged from the e interface and enters the plate heat exchanger 112 through the seventh interface 1123, and the freon flowing through the plate heat exchanger 112 emits heat at the plate heat exchanger 112 to exchange heat with the ground heating water flowing through the plate heat exchanger 112, so as to heat the ground heating water in the water circulation loop. When liquid freon enters the condenser 113, the freon is subjected to the action of the throttling device 1115, so that the pressure of the freon in the condenser 113 is suddenly reduced, and the liquid freon is changed into gaseous freon, wherein the throttling device 1115 can be a capillary tube or a component with throttling and pressure regulating functions such as an expansion valve. And then the freon absorbs heat from the external environment through the condenser 113, so that the heating capacity can be provided for the floor heating assembly 12, and after that, the freon flowing out of the condenser 113 enters the four-way reversing valve 114 through the port c, flows out of the port s and flows back to the compressor 111. In the defrosting mode, freon discharged from the compressor 111 enters the four-way reversing valve 114 through the d port, flows out from the c port and enters the condenser 113, high-temperature gaseous freon flowing through the condenser 113 changes into liquid freon to release heat when being cooled, so that frost represented by the condenser 113 can be melted, the freon absorbs cold after passing through the condenser 113, changes into low-temperature liquid freon and flows into the plate heat exchanger 112 through the pressure regulating device 1115, so that the freon absorbs heat from the plate heat exchanger 112, heating capacity is provided for defrosting, and finally the freon discharged from the plate heat exchanger 112 enters the four-way reversing valve 114 through the e port and flows back to the compressor 111.
When the air conditioning system 1 of the present application is operated in the heating mode, the air conditioning system 1 may heat the room by the indoor heat exchanger 131 through the indoor unit 13, or may heat the room by the indoor unit 13 and the floor heating unit 12 at the same time, and when the air conditioning system 1 of the present application is operated in the defrosting mode, the indoor unit 13 is not operated.
In addition, although the heat exchanger for exchanging heat with the ground heating water is the plate heat exchanger 112, this is not limitative, and a person skilled in the art may set the heat exchanger as needed to be other types of heat exchangers such as a tube-in-tube heat exchanger, and may flexibly select the setting form of the heat exchanger according to a specific application scenario without departing from the basic principle of the present application, so long as the heat exchange between the ground heating water and the refrigerant can be achieved through the heat exchanger.
Further, although the air conditioning system 1 is described above as exchanging heat between freon as a refrigerant and water, this is not limitative, but a person skilled in the art may use other substances having similar physical properties, such as propane, as the refrigerant of the air conditioning system 1, if necessary.
Furthermore, although the plate heat exchanger 112 is described as being installed on the outdoor side, this is not limitative, but it is obvious to those skilled in the art that the plate heat exchanger 112 may be installed on the indoor side as required, as long as the heat exchange between ground heating water and refrigerant can be achieved by the plate heat exchanger 112.
With continued reference to fig. 1 and 2, the air conditioning system 1 is configured with an indoor temperature sensor (not shown), an outdoor temperature sensor 1134, a water inlet temperature sensor 1125, a water outlet temperature sensor 1127, a first fluorine inlet temperature sensor 1129, a fluorine outlet temperature sensor 11210, a water inlet pressure sensor, a water outlet pressure sensor 1128, a suction pressure sensor 1113, and an exhaust pressure sensor 1114, a defrost cycle sensor 1133, an outdoor ambient temperature on the outdoor side can be detected by the outdoor temperature sensor 1134, an indoor temperature can be detected by the indoor temperature sensor (not shown), and a water inlet temperature Tw of ground heating water of the plate heat exchanger 112 can be detected by the water inlet temperature sensor 1125 1 The outlet water temperature Tw of the floor heating water of the plate heat exchanger 112 can be detected by the outlet water temperature sensor 1127 2 The fluorine inlet temperature Tf of the plate heat exchanger 112 can be detected by the first fluorine inlet temperature sensor 1129 1 The fluorine outlet temperature Tf of the plate heat exchanger 112 can be detected by the fluorine outlet temperature sensor 11210 2 The intake pressure P1 of the floor heating water of the plate heat exchanger 112 can be detected by the intake pressure sensor 1126, the discharge pressure P2 of the floor heating water of the plate heat exchanger 112 can be detected by the discharge pressure sensor 1128, the suction pressure Ps of the air intake of the compressor 111 can be detected by the suction pressure sensor 1113, the discharge pressure Pd of the air discharge of the compressor 111 can be detected by the discharge pressure sensor 1114, and the defrost cycle of the air conditioning system 1 can be acquired by the defrost cycle sensor 1133.
It should be noted that, although the air conditioning system 1 described above is configured with the outdoor temperature sensor 1134 and the indoor temperature sensor, the outdoor ambient temperature can be detected by the outdoor temperature sensor 1134, and the indoor temperature can be detected by the indoor temperature sensor, this is not limitative, and obviously, the air conditioning system 1 may not be configured with the outdoor temperature sensor 1134 and/or the indoor temperature sensor, for example, a positioning module may be provided on the air conditioning system 1 to obtain the location of the air conditioning system 1, and the air conditioning system 1 may be connected to the internet platform through a WiFi, bluetooth, zigBee, NFC, liFi, or other communication manner, and when the outdoor temperature needs to be obtained, the outdoor temperature of the location of the air conditioning system 1 can be obtained through the internet platform in an inquiry. The indoor temperature can be determined by a thermometer arranged in an indoor space, the thermometer is in communication connection with the air conditioning system 1, the thermometer can upload the detected indoor temperature to the air conditioning system 1, or a user can upload the outdoor temperature or the indoor temperature to the air conditioning system 1 through a remote controller, a mobile terminal such as APP which is in communication connection with the air conditioning system 1 or a PC end which is connected with the air conditioning system 1, and a person skilled in the art can flexibly select a specific mode for acquiring the outdoor temperature or the indoor temperature according to specific application scenes on the premise that the outdoor temperature and the indoor temperature can be acquired.
In the present application, the air conditioning system 1 is further provided with a monitoring device (not shown) connected to the water pump 122, and the floor heating water can be driven to flow in the water circulation circuit by the water pump 122, and the operation parameters of the water pump 122 can be acquired by the monitoring device, so that the operation state of the water pump 122 can be determined according to the acquired operation parameters of the water pump 122. Specifically, the monitoring device may be a power sensor or a current sensor, and the power and current of the water pump 122 are monitored by the power sensor or the current sensor to determine the operation state of the water pump 122, for example, when the water pump 122 is jammed, the power or the current of the water pump 122 suddenly increases and exceeds a safety threshold, so when the current or the power suddenly increases and exceeds the safety threshold, it is determined that the water pump 122 is jammed, when the water pump 122 fails due to an internal circuit, the power or the current of the water pump 122 suddenly becomes zero, and therefore, when the current or the power suddenly becomes zero, the water pump 122 is stopped due to the internal circuit being damaged.
When the water pump 122 is a variable frequency water pump, the running state of the variable frequency water pump can be monitored by monitoring the PWM signal of the variable frequency water pump, and when the water pump 122 is a constant frequency water pump, the running state of the variable frequency water pump and the blocking condition of the circulation water path can be judged by monitoring the changes of the pressure values of the water inlet and the water outlet of the constant frequency water pump.
In the present application, the air conditioning system 1 further includes a control module (not shown) capable of determining whether the flow rate of the ground heating water flowing through the heat exchanger is lower than a preset value, and if the flow rate is lower than the preset value, determining whether the cause of the flow rate being lower than the preset value is the inflow of the fluorine system (freon system), and when the cause is determined to be the inflow of the fluorine system, sending a reminder of the inflow of the fluorine system.
The control module may be a control chip of the air conditioning system 1 itself, a controller dedicated to executing the control method of the present application, or a functional module or a functional unit of the controller.
Next, possible implementations of the control method of the air conditioning system of the present application will be described with reference to fig. 3 to 10.
As shown in fig. 3, in one possible embodiment, the control method of the present application includes:
s100: judging whether the flow of the floor heating water flowing through the plate heat exchanger is lower than a preset value or not;
s101: if the flow rate is lower than the preset value, judging whether the reason for the flow rate lower than the preset value is that the fluorine system is in water;
s102: and when the reason is determined to be water inflow of the fluorine system, sending out a reminding of water inflow of the fluorine system.
In S100, the preset value is a flow value of the situation that the floor heating water in the plate heat exchanger is not frozen due to the cooling of low-temperature freon when the air conditioning system is in the defrosting mode, wherein the magnitude of the preset value can be adjusted according to actual situations, for example, the magnitude of the preset value can be determined according to the ambient temperature outside the room, the power of the compressor when the air conditioning system is in the defrosting mode, the fluorine inlet temperature Tf1 of the plate heat exchanger and other parameters. It should be noted that, a specific process of specifically determining whether the flow of the ground heating water flowing through the plate heat exchanger is lower than the preset value is described in detail below, so that redundancy is avoided, and details are not repeated here.
In S101, if the flow of the ground heating water flowing through the plate heat exchanger is lower than the preset value, it is indicated that the plate heat exchanger of the air conditioning system has a risk of frost cracking, and it is required to overhaul the air conditioning system and determine whether the reason for the flow lower than the preset value is that the fluorine system is in water, so that it is able to timely determine whether the fluorine system is in water, and further it is able to reduce the risk of further damage to the air conditioning system caused by the inflow of the refrigerant system.
If the flow of the floor heating water flowing through the plate heat exchanger is higher than a preset value, the flow of the floor heating water in the plate heat exchanger is in a normal state, and the risk of frost cracking of the plate heat exchanger of the air conditioning system is lower, so that the air conditioning system does not need to be overhauled at present, and the current running mode of the air conditioning system is controlled to run normally.
In the implementation of the present invention, the flow rate of the floor heating water in the plate heat exchanger of the air conditioning system is generally determined when the air conditioning system is operating in the heating mode. In the invention, when the air conditioning system operates in a heating mode, a high-temperature and high-pressure gaseous refrigerant from a compressor enters the plate heat exchanger, exchanges heat with ground heating water flowing through the plate heat exchanger, and heats the ground heating water. When the flow of the floor heating water in the plate heat exchanger is lower than a preset value, the air conditioning system can be overhauled in time, so that the problem that the air conditioning system is damaged or further damaged due to low flow of the floor heating water in the plate heat exchanger is avoided.
In S102, when it is determined that the reason that the flow of the ground heating water in the plate heat exchanger is lower than the preset value is that the fluorine system is in water, so that an maintainer can rapidly overhaul the plate heat exchanger, and the risk of damage to the air conditioning system caused by water inflow of the fluorine system can be further reduced.
It should be noted that, the reminding of the water inlet of the fluorine system can be sent out through the display panel of the air conditioning system, or can be sent out through the voice alarm device installed in the air conditioning system, or can be sent out through the display panel of the air conditioning system and the voice alarm device installed in the air conditioning system at the same time, or can obviously send out an alarm to the mobile terminal of the user through communication modes such as WiFi, bluetooth, zigBee, NFC, liFi and the like.
As shown in fig. 4, in one possible embodiment, S100 specifically includes:
s200: acquiring the water inlet temperature Tw of ground heating water entering the plate heat exchanger through the fifth interface 1 ；
S201: obtaining the outlet water temperature Tw of ground heating water flowing out of the plate heat exchanger through the sixth interface 2 ；
S202: acquiring the condensation temperature Pdt of the refrigerant flowing through the plate heat exchanger;
s203: calculating the water temperature Tw 2 With the water inlet temperature Tw 1 Is the difference Tw of (1) 2 -Tw 1 Condensation temperature Pdt and water outlet temperature Tw 2 Is the difference Pdt-Tw of 2 ；
S204: judging Tw 2 -Tw 1 Whether or not to be greater than DeltaT 1 And |Tw 1 -T Ring(s) |≤△T4、Pdt-Tw 2 Whether or not to be less than DeltaT 2 If yes, executing S205, and if not, executing S208;
s205: acquiring a first duration t1 in the state;
s206: judging whether the first duration t1 is greater than or equal to a first preset time, if so, executing S207, and if not, executing S208;
s207: determining that the flow is lower than a preset value;
s208: and determining that the flow is not lower than a preset value.
S200, acquiring the water inlet temperature Tw of the plate heat exchanger based on the water inlet temperature sensor 1 。
S201, obtaining the water outlet temperature Tw of the plate heat exchanger based on the water outlet temperature sensor 2 。
In S202, the condensation temperature Pdt is determined based on the discharge pressure Pd of the compressor acquired by the discharge pressure sensor. For example, a condensation temperature database may be previously constructed, and the exhaust gas pressure and the condensation temperature corresponding to each exhaust gas pressure may be stored in the condensation temperature database. And comparing the acquired exhaust pressure Pd with the exhaust pressures in a condensation temperature database, and determining the condensation temperature corresponding to the successfully matched exhaust pressure as condensation temperature Pdt.
In S203, based on the water inlet temperature Tw obtained in S200 1 The water outlet temperature Tw obtained in S201 2 And the condensing temperature Pdt obtained in S202, calculate the water temperature Tw 2 With the water inlet temperature Tw 1 Is the difference Tw of (1) 2 -Tw 1 Condensation temperature Pdt and water outlet temperature Tw 2 Is the difference Pdt-Tw of 2 。
S204, determining Tw 2 -Tw 1 Whether or not to be greater than DeltaT 1 At the same time Pdt-Tw 2 Whether or not to be less than DeltaT 2 Wherein DeltaT 1 A first threshold value is the water outlet temperature Tw of the plate heat exchanger when the flow rate of the ground heating water in the plate heat exchanger is equal to a preset value 2 With the water inlet temperature Tw 1 Is provided for the temperature difference of (a). DeltaT 2 A second threshold value is that the condensation temperature Pdt of Freon in the plate heat exchanger and the water outlet temperature Tw of the plate heat exchanger are when the flow rate of ground heating water in the plate heat exchanger is equal to a preset value 2 Is provided for the temperature difference of (a).
Obviously, the magnitude of the first threshold value may also be based on the inlet water temperature Tw of the plate heat exchanger 1 The operating parameters of the air conditioning system such as the operating power of the compressor, the ambient temperature outside the room, the ambient temperature inside the room, and the set temperature of the air conditioning system. In specific implementation, the control module may store a first threshold and a water inlet temperature Tw of the plate heat exchanger in advance 1 The operation parameters of the air conditioning system 1, such as the operation power of the compressor, the ambient temperature of the outdoor side, the ambient temperature of the indoor side, and the set temperature of the air conditioning system, etc., wherein the mapping relationship can be obtained according to historical training data. The second threshold is based on the discharge pressure Pd of the compressor and the inlet water temperature Tw of the plate heat exchanger 1 The operation parameters of the air conditioning system 1 such as the operation power of the compressor, the ambient temperature of the outdoor side, the ambient temperature of the indoor side and the like are determined, and when the air conditioning system is implemented, the control module can store the second threshold value, the exhaust pressure Pd of the compressor and the water inlet temperature Tw of the plate heat exchanger in advance 1 Operating power of compressor, ambient temperature T outside the chamber Ring(s) Indoor spaceThe mapping relation of the operation parameters of the air conditioning system 1 such as the side ambient temperature and the like can be obtained according to the historical training data.
In S205, a first duration t1 is obtained, the first duration being Tw 2 -Tw 1 ≥△T 1 And Pdt-Tw 2 ≤△T 2 Is not shown, is not shown.
In S206, the first duration t1 in S205 is compared with a first preset time to realize real-time detection of the flow in the plate heat exchanger, so that it can be determined in real time whether the flow of the floor heating water in the plate heat exchanger is higher than a preset value. Moreover, the detection process only needs to obtain the water inlet and outlet temperature Tw of the plate heat exchanger of the air conditioning system in the heating mode 1 Water outlet temperature Tw 2 And the exhaust pressure Pd of the compressor is enough, a flowmeter for detecting flow is not required to be installed in the plate heat exchanger, the risk of blockage of the plate heat exchanger caused by accumulation of impurities at the flowmeter can be reduced, and the running stability of an air conditioning system is ensured.
It should be noted that, the first preset time may be determined according to specific requirements, so long as the flow in the plate heat exchanger can be determined by the first preset time, and no further damage is generated during the first preset time even if an abnormal situation occurs in the air conditioning system, for example, the first preset time ranges from 30s to 2min, and in the embodiment of the present invention, the duration of the first preset time is 30s.
As shown in fig. 4, in another possible embodiment, S100 specifically includes:
s300: acquiring the water inlet temperature Tw of ground heating water entering the plate heat exchanger through the fifth interface 1 ；
S301: obtaining the outlet water temperature Tw of ground heating water flowing out of the plate heat exchanger through the sixth interface 2 ；
S302: obtaining the ambient temperature T Ring(s) ；
S303: acquiring the refrigerant temperature Tf at the eighth interface 1 ；
S304: acquiring cold at seventh interfaceMedia temperature Tf 2 ；
S305: calculating the water temperature Tw 2 With the water inlet temperature Tw 1 Is the difference Tw of (1) 2 -Tw 1 Calculating the water inlet temperature Tw 1 And ambient temperature T Ring(s) Absolute value of difference |Tw of (a) 1 -T Ring(s) I, calculate the water outlet temperature Tw 2 And ambient temperature T Ring(s) Absolute value of difference |Tw of (a) 2 -T Ring(s) I, calculate refrigerant temperature Tf at eighth interface 1 With the refrigerant temperature Tf at the seventh interface 2 Is of the difference Tf of (1) 1 -Tf 2 ；
S306: judging Tw 2 -Tw 1 Whether or not to be less than DeltaT 3 、|Tw 1 -T Ring(s) Whether or not is equal to or less than DeltaT 4 、|Tw 2 -T Ring(s) Whether or not is equal to or less than DeltaT 5 And Tf 2 -Tf 1 Whether or not to be less than DeltaT 6 If yes, execution S307 is performed, if not, execution 310 is performed;
s307: acquiring a second duration t2 in the state;
s308: judging whether the second duration t2 is greater than or equal to a second preset time, if so, executing S309, and if not, executing S310;
s309: determining that the flow is lower than a preset value;
s310: and determining that the flow is not lower than a preset value.
S300, acquiring the water inlet temperature Tw of the plate heat exchanger based on the water inlet temperature sensor 1 。
S301, obtaining the water outlet temperature Tw of the plate heat exchanger based on the water outlet temperature sensor 2 。
In S302, the outdoor ambient temperature T is obtained based on the above-mentioned outdoor temperature sensor Ring(s) 。
S303, obtaining the fluorine inlet temperature Tf of the plate heat exchanger based on the fluorine inlet temperature sensor 1 。
S304, obtaining the fluorine outlet temperature Tf of the plate heat exchanger based on the fluorine outlet temperature sensor 2 。
In S305, the inflow water obtained in the above S300 is usedTemperature Tw 1 The water outlet temperature Tw obtained in S301 2 The outdoor ambient temperature acquired in S302, the fluorine inlet temperature Tf acquired in S303 1 And the fluorine outlet temperature Tf obtained in S304 2 Calculating the water temperature Tw 2 With water inlet temperature Tw 1 Is the difference Tw of (1) 2 -Tw 1 Calculating the water inlet temperature Tw 1 And ambient temperature T Ring(s) Absolute value of difference |Tw of (a) 1 -T Ring(s) I, calculate the water outlet temperature Tw 2 And ambient temperature T Ring(s) Absolute value of difference |Tw of (a) 2 -T Ring(s) I, calculate refrigerant temperature Tf at eighth interface 1 With the refrigerant temperature Tf at the seventh interface 2 Is of the difference Tf of (1) 1 -Tf 2 。
S306, determining Tw 2 -Tw 1 Whether or not is less than DeltaT 3 and |Tw 1 -T Ring(s) Whether or not is less than or equal to DeltaT 4, |Tw 2 -T Ring(s) Whether or not I is equal to or less than DeltaT 5 and Tf 1 -Tf 2 Whether or not to be less than DeltaT 6 ，
Wherein DeltaT 3 A third threshold value is the water outlet temperature Tw of the plate heat exchanger when the water in the plate heat exchanger does not flow and is almost dead water 2 With the water inlet temperature Tw 2 Since the water in the plate heat exchanger hardly flows at this time, the water outlet temperature Tw of the plate heat exchanger 2 With the water inlet temperature Tw 1 And ambient temperature T Ring(s) Almost identical, i.e. the value of DeltaT 3 is small. In one possible embodiment, Δt3 has a value ranging between 0 ℃ and 2 ℃. Preferably, deltaT 3 Is 1 ℃.
Since the water outlet temperature Tw of the plate heat exchanger when the water in the plate heat exchanger is almost dead water 2 With the water inlet temperature Tw 1 And ambient temperature T Ring(s) Nearly identical, then |Tw 1 -T Ring(s) Value DeltaT of I 4 And |Tw 2 -T Ring(s) Value DeltaT of I 5 And will be small. In one possible embodiment, Δt 4 The value range of (2) is set between 0 ℃ and 5 DEG, deltaT 5 The value range of (2) is set between 0 ℃ and 5 ℃. Preferably，△T 4 Is at 3℃ delta T 5 Is 3 ℃.
Because the temperature of the ground heating water in the plate heat exchanger is almost unchanged, the Freon in the plate heat exchanger does not exchange heat with the ground heating water at the moment, so the fluorine inlet temperature Tf of the plate heat exchanger 1 And the fluorine outlet temperature Tf 2 Almost uniformly, however, because the air conditioning system is still running, the freon can continue to flow in the plate heat exchanger, and part of heat of the freon is transferred to the shell of the plate heat exchanger, so that the fluorine outlet temperature Tf of the plate heat exchanger is achieved 2 And fluorine inlet temperature Tf 1 There is a certain difference. In one possible embodiment, Δt 6 The range of values of (2) is set between 0 ℃ and 5 ℃. Preferably, deltaT 6 Is 5 ℃.
In S307, a first duration t1 is obtained, and the second duration t2 is Tw 2 -Tw 1 ≤△T 3 、|Tw 1 -T Ring(s) |≤△T 4 、|Tw 2 -T Ring(s) |≤△T 5 And Tf 1 -Tf 2 ≤△T 6 Is not shown, is not shown.
In S308, the second duration t2 in S307 is compared with a second preset time to realize real-time detection of the flow in the plate heat exchanger, so as to determine in real time whether the flow of the ground heating water in the plate heat exchanger is higher than a preset value. Moreover, the detection process only needs to obtain the water inlet and outlet temperature Tw of the plate heat exchanger of the air conditioning system in the heating mode 1 Water outlet temperature Tw 2 Ambient temperature T Ring(s) Fluorine inlet temperature Tf of plate heat exchanger 1 Fluorine outlet temperature Tf 2 And the flow meter for detecting the flow is not required to be arranged in the plate heat exchanger, so that the risk of blockage of the plate heat exchanger caused by accumulation of impurities at the flow meter can be reduced, and the running stability of an air conditioning system is ensured.
It should be noted that the second preset time may be determined according to specific requirements, so long as the flow in the plate heat exchanger can be determined by the second preset time, and no further damage is generated during the second preset time even if an abnormal condition occurs in the air conditioning system, for example, the second preset time is in a range of 30s-2min, and in the embodiment of the present application, the duration of the second preset time is 30s.
In the present application, if the flow rate is lower than the preset value, it is determined whether the cause of the flow rate being lower than the preset value is the inflow of the fluorine system, and the following description will be made with reference to fig. 6 to 10 as to possible embodiments of the present application for determining whether the cause of the flow rate being lower than the preset value is the inflow of the fluorine system.
As shown in fig. 6, in one possible embodiment, S101 further includes:
S400: acquiring operation parameters of an air conditioning system;
s401: and judging whether the reason is that the fluorine system is in-water based on the operation parameters of the air conditioning system.
In S400, the operation parameters of the air conditioning system include the operation parameters of the air conditioning system when the air conditioning system is in the heating mode. Of course, the operation parameter may also be an operation parameter of the air conditioning system when the air conditioning system is in the defrost mode. The operation parameters of the air conditioning system are stored in the air conditioning system, and are directly called when the operation parameters are needed.
In S401, whether the cause is water inflow of the fluorine system can be judged according to the running parameters of the air conditioning system, a detection device for detecting whether the fluorine system is water inflow is not needed to be additionally arranged, and the method and the device can judge the cause of water inflow of the fluorine system, so that the overhaul speed of after-sales personnel on the air conditioning system is improved.
Next, referring to fig. 7, a possible embodiment of determining whether the cause is the inflow of water of the fluorine system when the operation parameters of the air conditioning system of the present invention are the suction pressure and the discharge pressure of the compressor will be described.
In one possible implementation, as shown in fig. 7, S401 further includes:
s500: judging the variation trend of the suction pressure and the discharge pressure of the compressor;
S501: if both the suction pressure and the discharge pressure are in a decreasing trend, the cause is determined to be the inflow of water to the fluorine system.
In S500, the suction pressure Ps and the discharge pressure Pd of the compressor are obtained based on the suction pressure sensor and the discharge pressure sensor, and the trend of the changes in the suction pressure Ps and the discharge pressure Pd is determined according to the data of the suction pressure Ps and the discharge pressure Pd of the compressor in a preset time.
In S501, if both the suction pressure Ps and the discharge pressure Pd are in a decreasing trend, it is indicated that freon enters the ground heating water through the plate heat exchanger, that is, the water enters the fluorine system.
It should be noted that, when the refrigerant in the refrigerant circulation circuit of the air conditioning system is not leaked and is in operation, the suction pressure of the compressor is approximately between 0.7 and 1.2MPa, and the discharge pressure of the compressor is approximately between 2.0 and 2.8MPa, based on this, when the power of the compressor is reduced in operation of the air conditioning system, the operation speed of the compressor is reduced, so that the flow rate of the gas in the compressor is reduced, and the flow rate of the gas in the suction pipe is slowed, so that the static pressure in the suction pipe is increased, and therefore, the suction pressure Ps of the compressor is correspondingly increased. At the compressor discharge port, the compressor operating speed decreases, so that the compression ratio of the compressor decreases, the discharge air amount decreases accordingly, and the discharge air pressure Pd decreases, and therefore, when the compressor power decreases, the suction air pressure Ps of the compressor increases, and the discharge air pressure Pd decreases. Conversely, if the power of the compressor increases, the suction pressure Ps of the compressor decreases, and the discharge pressure Pd increases. Therefore, based on the analysis, if the flow rate of the floor heating water is detected to be lower than the preset value and the suction pressure and the discharge pressure of the compressor are both in a decreasing trend, the freon is indicated to enter the floor heating water through the plate heat exchanger, and the floor heating water enters the fluorine system through the plate heat exchanger.
Next, referring to fig. 8, a description will be given of a possible implementation of determining whether the reason is water inflow of the fluorine system when the historical operation parameter of the air conditioning system of the present invention is the defrosting period of the last operation defrosting mode of the air conditioning system.
In one possible implementation as in fig. 8, S401 further includes:
s600: judging whether the defrosting period is smaller than a preset defrosting period when the air conditioning system operates the defrosting mode last time;
s601: if the defrosting period is smaller than the preset defrosting period, determining that the cause is water inflow of the fluorine system.
In S600, the defrosting cycle of the air conditioning system at the last time of operating the defrosting mode is obtained by the defrosting cycle sensor.
It should be noted that the defrosting cycle sensor may be a second fluorine inlet temperature sensor installed on the condenser, where the second fluorine inlet temperature sensor is connected to the control module, so that the control module can record the temperature change condition of freon at the fluorine inlet of the condenser according to the temperature measured by the second fluorine inlet temperature sensor, when the temperature value of the fluorine inlet of the condenser is higher than a first preset temperature, it indicates that the air conditioning system is in a defrosting mode at this time, and when the temperature of the fluorine inlet of the condenser falls below a second preset temperature, it indicates that the air conditioning system is switched from the defrosting mode to the heating mode at this time, and the sum of the time of the defrosting mode and the heating mode is recorded by the control module. The preset defrosting cycle is the defrosting cycle of the air conditioning system when the fluorine system of the air conditioning system is not in water.
In S601, when the defrosting cycle of the last operation defrosting mode of the air conditioning system is smaller than the preset defrosting cycle, it is indicated that the fluorine system is in water, so that the water entering the refrigerant circulation loop is heated and evaporated to absorb heat, the temperature of the condenser is lower, the frosting speed of the condenser is increased, and the defrosting cycle of the air conditioning system is reduced, therefore, when the defrosting cycle of the last operation defrosting mode of the air conditioning system is detected to be smaller than the preset defrosting cycle, the fluorine system is determined to be in water.
When the air conditioning system defrost the condenser of the outdoor unit, the control module controls the four-way reversing valve to enable the high-temperature freon gas to enter the condenser, and when the high-temperature freon gas flows through the condenser, the high-temperature freon gas turns into liquid when encountering cold and emits a large amount of heat, so that heat is provided for melting the frost outside the condenser. At this time, the low-temperature freon liquid flowing out of the condenser enters from the seventh interface of the plate heat exchanger and absorbs heat from the ground heating water in the plate heat exchanger, so that the freon becomes high-temperature gas. As can be seen from the defrosting process of the air conditioning system, when the air conditioning system is defrosted, the temperature of the fluorine inlet of the condenser is high-temperature gaseous Freon, and the temperature range of the Freon is approximately 50-90 ℃. For example, in one possible embodiment, the first preset temperature is 50 ℃, such that the air conditioning system may be considered to begin operating in defrost mode when the temperature of the fluorine inlet of the condenser is detected to be greater than the first preset temperature. When the air conditioning system heats the room, the control module controls the four-way reversing valve to reverse the direction, so that liquid freon enters from the third interface of the condenser, and the liquid freon is changed into gaseous freon due to pressure reduction when the freon flows through the condenser, so that the condenser absorbs heat from the external environment, and heating capacity can be provided for the floor heating assembly. When the freon flows through the plate heat exchanger, the gaseous freon with high temperature and high pressure is changed into liquid state freon when being cooled, so that the floor heating water in the plate heat exchanger can be heated. In the heating process of the air conditioning system, when the freon enters the condenser through the plate heat exchanger, the temperature of the freon is approximately between 10 ℃ and 30 ℃. For example, in a possible embodiment of the present invention, the second preset temperature is 30 ℃, so that the air conditioning system can be considered to start the defrosting mode when the temperature of the fluorine inlet of the condenser is detected to be lower than the second preset temperature.
Next, referring to fig. 9, a possible embodiment of determining whether the cause is water intake of the fluorine system when the operation parameter of the air conditioning system of the present invention is the operation parameter of the water pump will be described.
As shown in fig. 9, in one possible embodiment, S401 further includes:
s700: determining an operating state of the water pump based on the operating parameters of the water pump;
s701: and judging whether the reason is that the fluorine system is in-water based on the running state of the water pump.
In S700, the operation state of the water pump includes a state in which the water pump is abnormally operated or a state in which the water pump is normally operated. In the embodiment of the invention, the state that the water pump is in abnormal operation includes a state that the impeller of the water pump is in a stalling state due to the impeller being stuck by foreign matters or a stalling state of the water pump due to the damage of the water pump. At this time, it is possible to judge whether the water pump is stopped due to the clogging of the foreign matter or the breakage of the water pump itself by obtaining the operation current of the water pump, specifically, when the current passing through the water pump suddenly becomes large and exceeds the safe current of the water pump, it is indicated that the water pump is clogged with the foreign matter, and when the current passing through the water pump suddenly becomes 0, it is indicated that the water pump is stopped due to the breakage of the water pump itself. Obviously, the running state of the water pump can be judged by measuring the power of the water pump, and the running state of the water pump can be judged by detecting the input PWM signal of the water pump or the output PWM signal of the water pump, so that a person skilled in the art can flexibly select the running parameters of the water pump according to specific application scenes on the premise of not deviating from the basic principle of the invention, as long as the running state of the water pump can be judged according to the measured running parameters of the water pump.
In S701, it can be determined through the running state of the water pump whether the reason that the flow of the ground heating water in the plate heat exchanger is lower than the preset value is the inflow of the fluorine system, so that the speed of determining whether the reason that the flow is lower than the preset value is the inflow of the fluorine system is improved, and further the risk of further damage of the air conditioning system due to the cracking of the plate heat exchanger is reduced.
As shown in fig. 1, the water pump in the air conditioning system is a fixed-frequency water pump, and the expansion tank is further arranged on the upstream side of the fixed-frequency water pump, so that when the plate heat exchanger is cracked and leaked, the expansion tank can supplement water in the upstream side floor heating component of the fixed-frequency water pump, and the flow of the water inlet of the fixed-frequency water pump is kept unchanged, or the flow change of the water inlet of the fixed-frequency water pump can be ensured to be in a preset range, so that when the plate heat exchanger is leaked, the pressure of the water inlet of the fixed-frequency water pump is unchanged or the pressure change is smaller than a preset difference value under the action of the expansion tank, and the preset difference value can be determined according to specific requirements, so long as the stable operation of the air conditioning system is not influenced. It should be noted that, although the fixed-frequency water pump described above in connection with the drawings is disposed upstream of the plate heat exchanger, this is not limitative, but one skilled in the art may dispose the fixed-frequency water pump on the downstream side of the plate heat exchanger as desired.
A possible implementation of determining whether the cause is the fluorine system water intake based on the operation state of the water pump is described below with reference to fig. 10.
As shown in fig. 10, in one possible embodiment, S401 further includes:
s800: obtaining the running state of the water pump;
s801: judging whether the water pump is in a normal running state, if so, executing S802, and if not, executing 808;
s802: acquiring the water inlet pressure P1 and the water outlet pressure P2 of the plate type heat exchanger in a preset time period;
s803: if the inlet water pressure P1 and the outlet water pressure P2 are both in a decreasing trend or both in an increasing trend, determining that the cause is not the inlet water of the fluorine system, determining that the cause is the blockage of the floor heating component, and executing S806;
s804: if the inflow pressure P1 is in an upward trend and the outflow pressure P2 is in a downward trend, determining that the cause is not inflow of the fluorine system, determining that the cause is blockage of the plate heat exchanger, and executing S807;
s805: if the water inlet pressure P1 is unchanged and the water outlet pressure P2 is in a decreasing trend, determining that the reason is the water inlet of the fluorine system;
s806: sending out a warning of the blockage of the floor heating component;
s807: sending out a prompt of blocking of the plate heat exchanger;
s808: determining that the cause is not fluorine system water inflow;
s809: and sending out a prompt for overhauling the water pump.
In S800, when the flow of the ground heating water in the plate heat exchanger is lower than the preset value, the running state of the water pump is obtained, so that the monitoring device for detecting the running state of the water pump does not need to detect the running state of the water pump at any time, and the service life of the monitoring device can be prolonged and the power consumption of the air conditioning system can be reduced.
In S801, it is determined whether the water pump is in a normal operation state.
If the water pump is in the normal operation state, S802 is executed. In S802, the water inlet pressure P1 of the plate heat exchanger is measured based on the water inlet pressure sensor, the water outlet pressure P2 of the plate heat exchanger is measured based on the water outlet pressure sensor, and the measured water inlet pressure P1 and water outlet pressure P2 are recorded in a database of the control module, so that the control module can acquire historical operation data of the water pump of the air conditioning system at any time. The preset time period refers to a time within 1min or 2min from the starting time when the flow rate of the ground heating water in the plate heat exchanger is detected to be lower than a preset value.
In S803, when the floor heating component is blocked, the pressure of the water inlet of the fixed-frequency water pump is reduced, and the pressure of the water outlet of the fixed-frequency water pump is increased, so that the water inlet pressure of the water inlet of the plate heat exchanger and the water outlet pressure of the water outlet are both increased due to the fact that the plate heat exchanger is located between the water outlet of the fixed-frequency water pump and the blocking point. Therefore, when the inlet water pressure P1 and the outlet water pressure P2 are both in a decreasing trend or both in an increasing trend, the reason for the blockage of the floor heating component can be determined, and the inlet water of the fluorine system is not generated.
It should be noted that, although the description above is made with reference to fig. 1, when the fixed-frequency water pump is disposed upstream of the plate heat exchanger and downstream of the floor heating assembly, and when both the inlet water pressure P1 and the outlet water pressure P2 are reduced, it is determined that the floor heating assembly is blocked. However, this is not limitative, and it is obvious that when the constant-frequency water pump is disposed downstream of the plate heat exchanger and upstream of the floor heating unit and both the inlet water pressure P1 and the outlet water pressure P2 are raised, it is determined that the floor heating unit is clogged.
In S804, when a blockage occurs in the plate heat exchanger, the water inlet of the plate heat exchanger is located between the water outlet of the fixed-frequency water pump and the blockage point, and the water outlet of the plate heat exchanger is located between the blockage point and the water inlet of the fixed-frequency water pump. Then, the inlet water pressure P1 of the plate heat exchanger may rise and the outlet water pressure P2 of the plate heat exchanger may decrease during the preset time period. Therefore, when the inlet water pressure P1 is in an upward trend and the outlet water pressure P2 is in a downward trend, it is determined that the blockage is caused by the plate heat exchanger, but not the inlet water of the fluorine system.
In S805, when the plate heat exchanger has a crack, the water inlet of the plate heat exchanger is positioned between the water outlet of the fixed-frequency water pump and the crack, so that the pressure of the water inlet of the fixed-frequency water pump is reduced, and the water tank supplements the ground heating water into the ground heating assembly, so that the flow of the water inlet of the fixed-frequency water pump is unchanged, the pressure of the water inlet of the fixed-frequency water pump is unchanged, and the pressure of the water inlet of the plate heat exchanger is unchanged. When the plate heat exchanger is cracked, the water outlet of the plate heat exchanger is positioned at the water inlet of the crack and the fixed-frequency water pump, so that even if the water tank supplements ground heating water to the ground heating water system, part of water in the plate heat exchanger enters the fluorine system, so that the flow of the water outlet of the plate heat exchanger is reduced, and the pressure at the water outlet of the plate heat exchanger is reduced. Therefore, when the inlet water pressure P1 is unchanged and the outlet water pressure P2 is in a decreasing trend, the cause is determined to be the inlet water of the fluorine system.
In S806, while or after the block of the floor heating component is determined in S803, a notification of the block of the floor heating component is sent out, where the notification of the block of the floor heating component may be sent out through a display panel of the air conditioning system, or may be sent out through a voice alarm device installed in the air conditioning system, or may be sent out simultaneously through the display panel of the air conditioning system and the voice alarm device installed in the air conditioning system, or may obviously send out an alarm to the mobile terminal of the user through a communication manner such as WiFi, bluetooth, zigBee, NFC, liFi, or the like.
In S807, while or after determining that the plate heat exchanger is blocked in S804, a notification of the plate heat exchanger is sent, where the notification of the maintenance of the plate heat exchanger may be sent through a display panel of the air conditioning system, or may be sent through a voice alarm device installed in the air conditioning system, or may be sent through both a display panel of the air conditioning system and a voice alarm device installed in the air conditioning system, or may obviously send an alarm to a mobile terminal of a user through WiFi, bluetooth, zigBee, NFC, liFi, and other communication modes.
If the water pump is in an abnormal operation state, S808 is performed. In S808, in S801, if the water pump is in the abnormal running state, it is determined that the reason for causing the flow of the floor heating water in the plate heat exchanger to be lower than the preset value is not the inflow of the fluorine system, so that the speed of the air conditioning system for determining the reason for causing the flow to be lower than the preset value can be increased, the time for determining the reason is shortened, and the risk of further damage to the air conditioning system caused by inflow of the refrigerant system can be further reduced.
In S809, when it is determined in S808 that the operation state of the water pump is an abnormal operation state, that is, when the water pump fails or is blocked, a reminder for repairing the water pump is sent out, where the reminder for repairing the water pump may be sent out through a display panel of the air conditioning system, or may be sent out through a voice alarm device installed in the air conditioning system, or may be sent out through both the display panel of the air conditioning system and the voice alarm device installed in the air conditioning system, or obviously may send out an alarm to the mobile terminal of the user through WiFi, bluetooth, zigBee, NFC, liFi, and other communication modes.
In summary, in the preferred technical scheme of the invention, whether the flow of the floor heating water in the plate heat exchanger is lower than a preset value or not is determined based on the water inlet temperature of the plate heat exchanger, the water outlet temperature of the plate heat exchanger, the fluorine inlet temperature of the plate heat exchanger, the fluorine outlet temperature of the plate heat exchanger, the suction pressure of the compressor, the discharge pressure of the compressor, the indoor temperature and the outdoor temperature, and after the flow of the floor heating water in the plate heat exchanger is determined to be lower than the preset value, the operation parameters of the water pump or the water inlet pressure of the plate heat exchanger and the water outlet pressure of the plate heat exchanger are combined to determine whether the reason for the flow of the floor heating water in the plate heat exchanger is the water inlet of a fluorine system or the blockage of a floor heating assembly or the blockage of the plate heat exchanger. The invention can also send out corresponding maintenance reminding according to the determined reason after determining the reason that the flow of the floor heating water in the plate heat exchanger is lower than the preset value, so that when the plate heat exchanger is just blocked, the early warning can be timely performed so as to prevent the plate heat exchanger from being frozen and cracked, or when the water in the plate heat exchanger just leaks into a fluorine system, the invention can timely warn so as to avoid the problems that the parts such as an expansion valve are damaged or the compressor is impacted due to the further water entering the fluorine system.
It should be noted that, although the steps are described in the above embodiment in a sequential manner, it should be understood by those skilled in the art that, in order to achieve the effects of the present embodiment, the steps need not be performed in such an order, and may be performed simultaneously (in parallel) or performed in reverse order, and these simple variations are all within the scope of the present application.
Thus far, the technical solution of the present application has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present application is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present application, and such modifications and substitutions will be within the scope of the present application.
Claims (10)
1. The control method of the air conditioning system is characterized in that the air conditioning system comprises a compressor, a condenser, a four-way valve, a heat exchanger and a ground heating assembly, a refrigerant can circulate among the compressor, the condenser and the heat exchanger, and ground heating water of the ground heating assembly can exchange heat with the refrigerant flowing through the heat exchanger at the heat exchanger
The control method comprises the following steps:
judging whether the flow of the ground heating water flowing through the heat exchanger is lower than a preset value or not;
if the flow is lower than the preset value, judging whether the reason for the flow lower than the preset value is water inlet of a refrigerant system or not;
and when the reason is that the refrigerant system is in water, sending out a prompt for the refrigerant system to be in water.
2. The control method according to claim 1, wherein the step of determining whether or not the cause of the flow rate being lower than the preset value is refrigerant system water intake further comprises:
acquiring operation parameters of the air conditioning system;
and judging whether the reason is water inlet of the refrigerant system or not based on the operation parameters of the air conditioning system.
3. The control method according to claim 2, wherein the operation parameters of the air conditioning system include suction pressure and discharge pressure of the compressor of the air conditioning system, and the step of judging whether the cause is the refrigerant system water intake based on the operation parameters of the air conditioning system further includes:
judging the variation trend of the suction pressure and the discharge pressure of the compressor of the air conditioning system;
and if the suction pressure and the discharge pressure are both in a decreasing trend, determining that the source is water inlet of the refrigerant system.
4. The control method according to claim 2, wherein the operation parameter of the air conditioning system is a defrosting cycle when the air conditioning system last operated in a defrosting mode, and the step of judging whether the cause is the refrigerant system water intake based on the operation parameter of the air conditioning system further comprises:
judging whether the defrosting period of the air conditioning system in the last defrosting mode is smaller than a preset defrosting period or not;
if the defrosting period is smaller than the preset defrosting period, determining that the source is water inlet of the refrigerant system.
5. The control method according to claim 2, wherein the air conditioning system further includes a water pump for circulating floor heating water between the floor heating assembly and the heat exchanger, the operation parameters of the air conditioning system further include the operation parameters of the water pump, and the step of determining whether the cause is the refrigerant system water intake based on the operation parameters of the air conditioning system further includes:
determining an operating state of the water pump based on an operating parameter of the water pump;
and judging whether the reason is water inlet of the refrigerant system or not based on the running state.
6. The control method according to claim 5, characterized in that the step of determining whether the cause is the refrigerant system water intake based on the operation state further comprises:
if the water pump is in an abnormal running state, determining that the reason is not water inlet of the refrigerant system;
if the water pump is in a normal running state, acquiring the water inlet pressure P1 and the water outlet pressure P2 of the heat exchanger in a preset time period, and further judging whether the reason is water inlet of the refrigerant system or not based on the change trend of the water inlet pressure P1 and the water outlet pressure P2.
7. The control method according to claim 6, characterized in that the control method further comprises:
and sending out a prompt for overhauling the water pump when or after determining that the reason is not that the refrigerant system is water-feeding.
8. The control method according to claim 6, wherein,
the step of judging whether the cause is the refrigerant system water inlet based on the change trend of the water inlet pressure P1 and the water outlet pressure P2 further comprises the following steps:
if the water inlet pressure P1 and the water outlet pressure P2 are both in a decreasing trend or are both in an increasing trend, determining that the reason is not that the refrigerant system is water inlet, and determining that the reason is that the floor heating component is blocked;
If the water inlet pressure P1 is in an ascending trend and the water outlet pressure P2 is in a descending trend, determining that the reason is not water inlet of the refrigerant system, and determining that the reason is blockage of the heat exchanger;
if the water inlet pressure P1 is unchanged and the water outlet pressure P2 is in a decreasing trend, determining that the reason is water inlet of the refrigerant system.
9. The control method according to claim 8, characterized in that the control method further comprises:
when or after the floor heating component is determined to be blocked, sending a prompt for the blocking of the floor heating component;
and simultaneously or after the heat exchanger is determined to be blocked, sending out a reminding of the heat exchanger to be blocked.
10. The control method according to claim 1, wherein the four-way valve has four interfaces of an e interface, a d interface, a c interface, and an s interface, the compressor has a first interface and a second interface, the condenser has a third interface and a fourth interface, the heat exchanger has a fifth interface, a sixth interface, a seventh interface, and an eighth interface, the first interface is connected to the d interface, the third interface is connected to the eighth interface, the fourth interface is connected to the c interface, the seventh interface is connected to the e interface, the second interface is connected to the s interface, a water outlet of the floor heating assembly is connected to the fifth interface, a water inlet of the floor heating assembly is connected to the sixth interface,
The step of "judging whether the flow rate of the ground heating water flowing through the heat exchanger is lower than a preset value" further includes:
acquiring the water inlet temperature Tw of ground heating water entering the heat exchanger through the fifth interface 1 ；
Obtaining the outlet water temperature Tw of the ground heating water flowing out of the heat exchanger through the sixth interface 2 ；
Acquiring the condensation temperature Pdt of the refrigerant flowing through the plate heat exchanger;
if Tw 2 -Tw 1 ≥△T 1 And Pdt-Tw 2 ≤△T 2 If the duration time of the state is greater than or equal to a first preset time t1, determining that the flow is lower than the preset value;
wherein DeltaT 1 Is a first threshold value, deltaT 2 Is a second threshold; and/or
Acquiring the water inlet temperature Tw of ground heating water entering the heat exchanger through the fifth interface 1 The outlet water temperature Tw of the ground heating water flowing out of the heat exchanger through the sixth interface 2 ；
Acquiring the ambient temperature T Ring(s) ；
Acquiring the refrigerant temperature Tf at the eighth interface 1 ；
Acquiring the refrigerant temperature Tf at the seventh interface 2 ；
If Tw 2 -Tw 1 ≤△T 3 、|Tw 1 -T Ring(s) |≤△T 4 、|Tw 2 -T Ring(s) |≤△T 5 And Tf 1 -Tf 2 ≤△T 6 And the duration of the state is greater than or equal to the second preset time t 2 Determining that the flow is lower than the preset value;
wherein DeltaT 3 Is a third threshold value, deltaT 4 Is a fourth threshold value, deltaT 5 Is a fifth threshold value, deltaT 6 Is the sixth threshold.
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| CN202310661426.0A CN116734398A (en) | 2023-06-06 | 2023-06-06 | Control method of air conditioning system |
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| CN202310661426.0A CN116734398A (en) | 2023-06-06 | 2023-06-06 | Control method of air conditioning system |
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