CN113137732A - Control method for heating water in low-frequency running of outdoor unit of triple co-generation system - Google Patents
Control method for heating water in low-frequency running of outdoor unit of triple co-generation system Download PDFInfo
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- CN113137732A CN113137732A CN202110308732.7A CN202110308732A CN113137732A CN 113137732 A CN113137732 A CN 113137732A CN 202110308732 A CN202110308732 A CN 202110308732A CN 113137732 A CN113137732 A CN 113137732A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—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
- F24F11/84—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 valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D15/00—Other domestic- or space-heating systems
- F24D15/04—Other domestic- or space-heating systems using heat pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2221/00—Details or features not otherwise provided for
- F24F2221/18—Details or features not otherwise provided for combined with domestic apparatus
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/12—Hot water central heating systems using heat pumps
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Combustion & Propulsion (AREA)
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- Thermal Sciences (AREA)
- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Fluid Mechanics (AREA)
- Human Computer Interaction (AREA)
- Mathematical Physics (AREA)
- Heat-Pump Type And Storage Water Heaters (AREA)
Abstract
The invention discloses a control method for heating water when an outdoor unit of a triple co-generation system runs at a low frequency, when an indoor unit of an air conditioner refrigerates and a hot water module runs, if the condensation temperature of the system cannot meet the temperature required by the hot water module, a fan of the outdoor unit is decelerated, meanwhile, the opening of a main expansion valve of the outdoor unit is reduced, and more high-temperature refrigerant flows into the hot water module to exchange heat with water; the water tank micro-channel heat exchanger is small in refrigerant circulation amount and easy to establish high pressure, so that the temperature of domestic hot water can be increased, indoor air conditioner refrigeration is met, refrigerant after heat exchange with the hot water module and refrigerant after heat exchange in the outdoor unit are gathered and then enter the air conditioner indoor unit together for refrigeration, and then return to the outdoor unit to complete circulation. The invention realizes multiple modes through one outdoor host, and the outdoor unit has simple structural design, and the third pipe is designed without redundant reversing valves, thus the control is simple; meanwhile, the condition of low load of the indoor unit of the indoor air conditioner is met, and the temperature of domestic hot water can also be met.
Description
Technical Field
The invention relates to a control method for heating water in a triple co-generation system during low-frequency running of an outdoor unit.
Background
The existing industry has a heat recovery product, an outer machine needs two four-way valves to switch refrigerants, and indoor units, except an air conditioner inner machine, also have floor heating and domestic hot water, although air conditioner refrigeration and domestic hot water can be provided at the same time, the system pipeline of the outer machine is complex and the production efficiency is low;
when the air conditioner is used for refrigerating in summer, a refrigerant of the four-way valve enters the indoor unit for refrigerating, the four-way valve enters the hot water module for exchanging heat with water to generate domestic hot water, if the indoor unit of the air conditioner is only opened one or the load is very small, the frequency output of the outdoor compressor is very small, and the temperature of the domestic hot water cannot be met at the moment; if the frequency of the outdoor unit needs to be increased in order to increase the temperature of domestic hot water, the outdoor unit cannot exchange heat due to the fact that the number of the indoor units is small or the load is small, and therefore the indoor unit is easy to freeze and cannot normally perform refrigeration.
Disclosure of Invention
In view of the above problems, the present invention provides a method for controlling water heating of a triple co-generation system during low-frequency operation of an outdoor unit, which effectively solves the problems pointed out in the background art.
The technical scheme adopted by the invention is as follows:
a control method for heating water in a triple co-generation system during low-frequency running of an outdoor unit comprises the following steps:
1) and judging whether the following two conditions are simultaneously met:
a) the air conditioner internal machine is in refrigeration operation, and an expansion valve corresponding to the air conditioner internal machine is opened;
b) when the hot water module runs, opening an expansion valve corresponding to the hot water module;
2) and if the judgment result meets 1, after the outdoor unit operates for a set time t, performing the following judgment: and if the condensation temperature of the system meets the temperature required by the hot water module, keeping the system normally running, and if not, reducing the speed of the fan of the outdoor unit, keeping the electric control temperature to be less than or equal to 85 ℃, simultaneously reducing the opening size of the main expansion valve of the outdoor unit, and executing the step 2 again after the outdoor unit runs for a set time t until the condensation temperature of the system meets the temperature required by the hot water module, or when the rotating speed of the fan of the outdoor unit is the lowest set rotating speed and the electric control temperature of the outdoor electric control module is greater than 85 ℃, the fan of the outdoor unit does not reduce the speed and the opening size of the main expansion valve of the outdoor unit is the smallest set opening.
Preferably, the set time t in 2 is 5 to 15 minutes.
Preferably, the fan of the 2-middle outdoor unit is adjusted to be adjusted by one step downwards when the speed is reduced.
Preferably, the adjustment range of the expansion valve of the 2-middle outdoor unit is reduced by 30% when the opening is reduced.
Meanwhile, the invention also provides a multi-connected triple co-generation system adopting the control method, and the specific technical scheme is as follows:
the utility model provides a ally oneself with trigeminy confession system more, includes indoor set and off-premises station, the indoor set including warm up module, tuber pipe machine module and hot water module, the gas vent of off-premises station is connected with a cross valve, the second opening of cross valve with warm up the module and the trachea mouth of tuber pipe machine module links to each other, the third opening of cross valve links to each other with the compressor return-air inlet of off-premises station behind the vapour and liquid separator, the fourth opening of cross valve links to each other with the liquid pipe mouth of warm up module, tuber pipe machine module and hot water module behind heat exchanger, the gas vent of off-premises station links to each other through the water tank mouth of third root canal and hot water module at the front end of cross valve.
Preferably, the hot water module comprises a power supply port, a water inlet, a water outlet micro-channel heat exchanger and a sewage draining outlet.
Meanwhile, the invention also provides a control method of the multi-connected triple co-generation system, which comprises the following steps:
when the floor heating module is independently started, the expansion valves of the air duct machine module and the hot water module are opened for 40-60 steps, the expansion valve of the floor heating module is opened, the outdoor unit discharges compressed high-temperature and high-pressure gaseous refrigerants from an exhaust port to enter the four-way valve and then from a second opening of the four-way valve to enter the floor heating module from an air pipe opening, the high-temperature and high-pressure gaseous refrigerants are changed into liquid refrigerants after heat exchange in the floor heating module, the liquid refrigerants are discharged from a liquid pipe opening through the corresponding expansion valve and then enter a heat exchanger of the outdoor unit to absorb heat after passing through the economizer, the liquid refrigerants return to the four-way valve from a fourth opening of the four-way valve after heat absorption, then enter a gas-liquid separator from a third opening of the four-way valve and finally return to the compressor of the outdoor unit;
when the air pipe machine module is independently started for heating, the expansion valves of the floor heating module and the hot water module are opened for 40-60 steps, the expansion valve of the air pipe machine module is opened, the outdoor unit discharges compressed high-temperature and high-pressure gaseous refrigerants from an exhaust port to enter the four-way valve, then discharges the high-temperature and high-pressure gaseous refrigerants from a second opening of the four-way valve to enter the air pipe machine module from an air pipe opening, the high-temperature and high-pressure gaseous refrigerants are converted into liquid refrigerants after heat exchange in the air pipe machine module, the liquid refrigerants are discharged from a liquid pipe opening through the corresponding expansion valve, pass through the economizer and then enter a heat exchanger of an outdoor unit for heat absorption, return to the four-way valve from a fourth opening of the four-way valve after heat absorption is finished, enter a gas-liquid separator from a third opening of the four-way valve, and finally return to the compressor of the outdoor unit;
when the air pipe machine module is independently started for refrigeration, the expansion valves of the floor heating module and the hot water module are closed, the expansion valve of the air pipe machine module is opened, the outdoor unit discharges compressed high-temperature and high-pressure gaseous refrigerants from an exhaust port into the four-way valve and then discharges the gaseous refrigerants from a fourth opening of the four-way valve, the gaseous refrigerants enter a heat exchanger of the outdoor unit for heat exchange to become liquid refrigerants, the liquid refrigerants pass through the economizer and then enter the air pipe machine module from a liquid pipe port, the liquid refrigerants are changed into gaseous refrigerants after the heat exchange in the air pipe machine module is completed, the gaseous refrigerants are discharged from an air pipe port, then enter the four-way valve from a second opening of the four-way valve and then are discharged from a third opening of the four-way valve, enter a gas-liquid separator and then return to the compressor of the outdoor unit from a gas return port of the gas-liquid separator;
when the hot water module is independently started, the expansion valve of the floor heating module and the air duct machine module is opened for 40-60 steps, the expansion valve of the hot water module is opened for 200-400 steps, the outdoor unit sends compressed high-temperature and high-pressure gaseous refrigerant into the third pipe from the exhaust port, the high-temperature and high-pressure gaseous refrigerant entering the third pipe enters the hot water module from the water tank port, the high-temperature and high-pressure gaseous refrigerant is changed into liquid refrigerant after heat exchange is completed in the hot water module, the liquid refrigerant is discharged from the liquid pipe port through the corresponding expansion valve, and enters the heat exchanger of the outdoor unit for heat absorption after passing through the economizer, and returns to the four-way valve from the fourth port of the four-way valve after heat absorption is completed, enters the gas-liquid separator from the third port of the four-way valve, and finally returns to the compressor of the outdoor unit;
when the air duct type module is started to heat and the hot water module is started simultaneously, the expansion valves 200 and 450 steps of the air duct type module and the hot water module are opened, the expansion valve of the floor heating module is opened for 40-60 steps, the outdoor unit discharges compressed high-temperature and high-pressure gaseous refrigerants from the exhaust port into the four-way valve and the third pipe, the high-temperature and high-pressure gaseous refrigerants entering the four-way valve are discharged from the second opening of the four-way valve and enter the air duct type module from the air pipe opening, the high-temperature and high-pressure gaseous refrigerants are converted into liquid refrigerants after heat exchange in the air duct type module, the liquid refrigerants are discharged from the liquid pipe opening through the corresponding expansion valves, enter the heat exchanger of the outdoor unit for heat absorption after passing through the economizer, return to the four-way valve from the fourth opening of the four-way valve after heat absorption, then enter the gas-liquid separator from the third opening of the four-way valve, finally return to the compressor of the outdoor unit, and the high-temperature and high-pressure gaseous refrigerants entering the third pipe enter the hot water module from the water tank opening, the high-temperature high-pressure gaseous refrigerant is changed into a liquid refrigerant after heat exchange is completed in the hot water module, the liquid refrigerant is discharged from a liquid pipe port through a corresponding expansion valve, enters a heat exchanger of an outdoor unit for absorbing heat after passing through an economizer, returns to the four-way valve from a fourth port of the four-way valve after absorbing heat, enters a gas-liquid separator from a third port of the four-way valve, and finally returns to a compressor of the outdoor unit;
when the air pipe machine module is started for refrigeration and the hot water module is started, the expansion valve of the air pipe machine module is opened for 100-300 steps, the expansion valve of the hot water module is opened for 200-450 steps, the expansion valve of the floor heating module is opened for 40-60 steps, the outdoor unit discharges compressed high-temperature and high-pressure gaseous refrigerants from the exhaust port into the four-way valve and the third pipe, the high-temperature and high-pressure gaseous refrigerants entering the four-way valve are discharged from the fourth port of the four-way valve and enter the heat exchanger to be liquid refrigerants, the liquid refrigerants pass through the economizer and then enter the air pipe machine module from the liquid pipe port, the liquid refrigerants are changed into gaseous refrigerants after completing heat exchange in the air pipe machine module, the gaseous refrigerants are discharged from the air pipe port through the corresponding expansion valves, then enter the four-way valve from the second opening of the four-way valve, the four-way valve is discharged from the third opening and then enters the gas-liquid separator, and finally return to the compressor of the outdoor unit, the high-temperature high-pressure gaseous refrigerant entering the third pipe enters the hot water module from the water tank port, the high-temperature high-pressure gaseous refrigerant is changed into a liquid refrigerant after heat exchange is completed in the hot water module, the liquid refrigerant is discharged from the hot water module through a corresponding expansion valve, and the discharged liquid refrigerant and the liquid refrigerant at the liquid pipe port are gathered together and then enter the air pipe machine module to refrigerate the air pipe machine module;
when the air pipe machine module is started to heat and the floor heating module, the expansion valves of the air pipe machine module and the floor heating module are opened for 200 and 400 steps, the expansion valve of the hot water module is opened for 40-60 steps, the outdoor unit discharges compressed high-temperature and high-pressure gaseous refrigerants from the exhaust port into the four-way valve and then discharges the compressed high-temperature and high-pressure gaseous refrigerants from the second opening of the four-way valve and then enters the air pipe machine module and the floor heating module from the air pipe port, the high-temperature and high-pressure gaseous refrigerants are converted into liquid refrigerants after heat exchange in the air pipe machine module and the floor heating module, the liquid refrigerants are discharged from the liquid pipe ports through the expansion valves corresponding to the air pipe machine module and the floor heating module, enter the heat exchanger of the outdoor unit to absorb heat after passing through the economizer, and then return to the four-way valve from the fourth port of the four-way valve, then enter the gas-liquid separator from the third port of the four-way valve and finally return to the compressor of the outdoor unit;
when the hot water module and the floor heating module are started, the expansion valves of the hot water module and the floor heating module are opened for 200-400 steps, the expansion valve of the air duct machine module is opened for 40-60 steps, the outdoor unit discharges compressed high-temperature and high-pressure gaseous refrigerants from the exhaust port into the four-way valve and the third pipe, the high-temperature and high-pressure gaseous refrigerants entering the four-way valve are discharged from the second opening of the four-way valve and enter the floor heating module from the air pipe opening, the high-temperature and high-pressure gaseous refrigerants are converted into liquid refrigerants after heat exchange in the floor heating module, the liquid refrigerants are discharged from the liquid pipe opening through the corresponding expansion valves and enter the heat exchanger of the outdoor unit 2 for heat absorption after passing through the economizer, the high-temperature and high-pressure gaseous refrigerants return to the four-way valve from the fourth opening of the four-way valve after heat absorption, then enter the gas-liquid separator from the third opening of the four-way valve and finally return to the compressor of the outdoor unit, and the high-temperature and high-pressure gaseous refrigerants entering the third pipe enter the hot water module from the water tank opening, the high-temperature high-pressure gaseous refrigerant is changed into a liquid refrigerant after heat exchange is completed in the hot water module, the liquid refrigerant is discharged from a liquid pipe port through a corresponding expansion valve, enters a heat exchanger of an outdoor unit for absorbing heat after passing through an economizer, returns to the four-way valve from a fourth port of the four-way valve after absorbing heat, enters a gas-liquid separator from a third port of the four-way valve, and finally returns to a compressor of the outdoor unit;
when the hot water module and the floor heating module are started, and the air duct machine module is started to perform heating, the expansion valve 200 of the hot water module, the floor heating module and the air duct machine module is opened for 400 steps, the outdoor unit discharges compressed high-temperature and high-pressure gaseous refrigerants from the exhaust port into the four-way valve and a third pipe, the high-temperature and high-pressure gaseous refrigerants entering the four-way valve are discharged from a second opening of the four-way valve and enter the floor heating module and the air duct machine module from the air pipe opening, the high-temperature and high-pressure gaseous refrigerants are converted into liquid refrigerants after heat exchange in the floor heating module and the air duct machine module, the liquid refrigerants are discharged from a liquid pipe opening through the expansion valve corresponding to the floor heating module and the air duct machine module, enter a heat exchanger of an outdoor unit for heat absorption after passing through an economizer, return to the four-way valve from a fourth opening of the four-way valve after heat absorption, then enter a gas-liquid separator from a third opening of the four-way valve, and finally return to the compressor of the outdoor unit, the high-temperature high-pressure gaseous refrigerant entering the third pipe enters the hot water module from the water tank port, the high-temperature high-pressure gaseous refrigerant is changed into a liquid refrigerant after heat exchange is completed in the hot water module, the liquid refrigerant is discharged from the liquid pipe port through the corresponding expansion valve, enters the heat exchanger of the outdoor unit for heat absorption after passing through the economizer, returns to the four-way valve from the fourth port of the four-way valve after heat absorption is completed, enters the gas-liquid separator from the third port of the four-way valve, and finally returns to the compressor of the outdoor unit.
Preferably, when any one of the hot water module, the floor heating module and the air conditioner module operates independently, the condensation temperature and the frequency output are controlled according to the operation module.
Preferably, when the air duct machine module and the floor heating module operate simultaneously, the frequency output is controlled according to the target condensation pressure of the air duct machine module.
Preferably, when the air duct machine module and the hot water module are simultaneously operated, the frequency output is controlled according to a target condensing pressure of the air duct machine module.
Preferably, when the ground heating module and the hot water module operate simultaneously, the frequency output is controlled according to the target condensation pressure of the ground heating module.
Preferably, when the air duct machine module, the floor heating module and the hot water module are simultaneously started, the frequency output is controlled according to the target condensation pressure of the air duct machine module.
The invention can improve the temperature of domestic hot water because the circulation quantity of the refrigerant of the water tank micro-channel heat exchanger is small and high pressure is easy to establish, and simultaneously meets the requirement of indoor air conditioner refrigeration.
The invention realizes multiple modes through one outdoor host, and the outdoor unit has simple structural design, and the third pipe is designed without redundant reversing valves, thus the control is simple; meanwhile, the condition of low load of the indoor unit of the indoor air conditioner is met, and the temperature of domestic hot water can also be met.
Drawings
FIG. 1 is a control schematic of the present invention;
fig. 2 is a schematic structural diagram of a multiple combined supply system to which the control principle of the present invention is applied.
Detailed Description
The invention is described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Example 1
As shown in fig. 1, a method for controlling water heating of a triple co-generation system during low-frequency operation of an outdoor unit includes the following steps:
1. whether the following two conditions are simultaneously met is judged:
c) the air conditioner internal machine is in refrigeration operation, and an expansion valve corresponding to the air conditioner internal machine is opened;
d) when the hot water module runs, opening an expansion valve corresponding to the hot water module;
2. if the requirement is 1, after the outdoor unit operates for a set time t, the following judgment is carried out: and if the condensation temperature of the system meets the temperature required by the hot water module, keeping the system normally running, and if not, reducing the speed of the fan of the outdoor unit, keeping the electric control temperature to be less than or equal to 85 ℃, simultaneously reducing the opening size of the main expansion valve of the outdoor unit, and executing the step 2 again after the outdoor unit runs for a set time t until the condensation temperature of the system meets the temperature required by the hot water module, or when the rotating speed of the fan of the outdoor unit is the lowest set rotating speed and the electric control temperature of the outdoor electric control module is greater than 85 ℃, the fan of the outdoor unit does not reduce the speed and the opening size of the main expansion valve of the outdoor unit is the smallest set opening.
When the power of an air conditioner indoor unit in refrigerating operation is increased and the outdoor unit cannot meet the target evaporation pressure of the air conditioner indoor unit, controlling a fan of the outdoor unit to speed up, wherein the speed up range is one stage at each speed up, simultaneously increasing the opening size of a main expansion valve of the outdoor unit by 30% at each time until the outdoor unit can meet the target evaporation pressure of the air conditioner indoor unit or the fan of the outdoor unit reaches the set highest rotating speed and the main expansion valve of the outdoor unit reaches the set maximum opening.
The set time t in 2 is 5 to 15 minutes, preferably 10 minutes.
And 2, the adjustment amplitude of the fan of the outdoor unit in the 2 nd stage is adjusted to be lower by one stage when the speed is reduced.
The adjustment range of the expansion valve of the 2-middle outdoor unit is reduced by 30% when the opening is reduced.
As shown in fig. 2, a multi-connected triple co-generation system comprises an indoor unit 1 and an outdoor unit 2, wherein the indoor unit 1 comprises a floor heating module 11, an air duct machine module 12 and a hot water module 13, an exhaust port of the outdoor unit 2 is connected with a four-way valve 3, a second opening 31 of the four-way valve 3 is connected with an air duct port of the floor heating module 11 and the air duct machine module 12, a third opening 32 of the four-way valve 3 is connected with a compressor return air port of the outdoor unit 2 after passing through a gas-liquid separator 23, a fourth opening 33 of the four-way valve 3 is connected with liquid duct ports of the floor heating module 11, the air duct machine module 12 and the hot water module 13 after passing through a heat exchanger 21 and an economizer 22, and the exhaust port of the outdoor unit 2 is connected with a water tank port of the hot water module 13 through a third pipe 4 at the front end of the four-way valve 3.
A control method of a multi-connected and triple-combined supply system,
when the floor heating module 11 is independently started, the expansion valves of the air duct machine module 12 and the hot water module 13 are opened for 40-60 steps, the expansion valve of the floor heating module 11 is opened, the outdoor unit 2 discharges compressed high-temperature and high-pressure gaseous refrigerants from an exhaust port to enter the four-way valve 3, then the compressed high-temperature and high-pressure gaseous refrigerants are discharged from a second opening 31 of the four-way valve 3 and enter the floor heating module 11 from an air duct port, the high-temperature and high-pressure gaseous refrigerants are converted into liquid refrigerants after heat exchange in the floor heating module 11, the liquid refrigerants are discharged from a liquid duct port through the corresponding expansion valve, pass through the economizer 22 and then enter the heat exchanger 21 of the outdoor unit 2 to absorb heat, return to the four-way valve 3 from a fourth port 33 of the four-way valve 3 after heat absorption, then enter the gas-liquid separator 23 from a third port 32 of the four-way valve 3, and finally return to the compressor of the outdoor unit 2;
when the air pipe machine module 12 is independently started for heating, the expansion valves of the floor heating module 11 and the hot water module 13 are opened for 40-60 steps, the expansion valve of the air pipe machine module 12 is opened, the outdoor unit 2 discharges compressed high-temperature and high-pressure gaseous refrigerants from an exhaust port to enter the four-way valve 3, then discharges the compressed high-temperature and high-pressure gaseous refrigerants from a second opening 31 of the four-way valve 3, the compressed high-temperature and high-pressure gaseous refrigerants enter the air pipe machine module 12 from an air outlet, the high-temperature and high-pressure gaseous refrigerants are converted into liquid refrigerants after heat exchange in the air pipe machine module 12, the liquid refrigerants are discharged from a liquid pipe port through the corresponding expansion valve, enter the heat exchanger 21 of the outdoor unit 2 after passing through the economizer 22 for heat absorption, return to the four-way valve 3 from a fourth port 33 of the four-way valve 3 after heat absorption, then enter the gas-liquid separator 23 from a third port 32 of the four-way valve 3, and finally return to the compressor of the outdoor unit 2;
when the air pipe machine module 12 is independently started for refrigeration, expansion valves of the floor heating module 11 and the hot water module 13 are closed, the expansion valve of the air pipe machine module 12 is opened, the outdoor machine 2 discharges compressed high-temperature and high-pressure gaseous refrigerants from an exhaust port to enter the four-way valve 3 and then discharges the gaseous refrigerants from a fourth opening 33 of the four-way valve 3, the gaseous refrigerants enter the heat exchanger 21 of the outdoor machine 2 for heat exchange to become liquid refrigerants, the liquid refrigerants pass through the economizer 22 and then enter the air pipe machine module 12 from a liquid pipe port, the liquid refrigerants are changed into gaseous refrigerants after heat exchange in the air pipe machine module 12, the gaseous refrigerants are discharged from a gas pipe port, then enter the four-way valve 3 from a second opening 31 of the four-way valve 3, and then enter the gas-liquid separator 23 after the four-way valve 3 is discharged from a third opening 32, and then return to the compressor of the outdoor machine 2 from a return port of the gas-liquid separator 23;
when the hot water module 13 is independently started, the expansion valves of the floor heating module 11 and the air duct module 13 are opened for 40-60 steps, the expansion valve 200 of the hot water module 13 is opened for 400 steps, the outdoor unit 2 sends compressed high-temperature and high-pressure gaseous refrigerant into the third pipe 4 from the exhaust port, the high-temperature and high-pressure gaseous refrigerant entering the third pipe 4 enters the hot water module 13 from the water tank port, the high-temperature and high-pressure gaseous refrigerant is changed into liquid refrigerant after heat exchange is completed in the hot water module 13, the liquid refrigerant is discharged from the liquid pipe port through the corresponding expansion valve, passes through the economizer 22 and then enters the heat exchanger 21 of the outdoor unit 2 for heat absorption, returns to the four-way valve 3 from the fourth port 33 of the four-way valve 3 after heat absorption is completed, enters the gas-liquid separator 23 from the third port 32 of the four-way valve 3 and finally returns to the compressor of the outdoor unit 2;
when the air duct machine module 12 is started to heat and the hot water module 13 is started simultaneously, the expansion valves 200 and 450 of the air duct machine module 12 and the hot water module 13 are opened, the expansion valve of the floor heating module 12 is opened for 40-60 steps, the outdoor unit 2 discharges compressed high-temperature and high-pressure gaseous refrigerant from the exhaust port into the four-way valve 3 and the third pipe 4, the high-temperature and high-pressure gaseous refrigerant entering the four-way valve 3 is discharged from the second opening 31 of the four-way valve 3 and enters the air duct machine module 12 from the air duct port, the high-temperature and high-pressure gaseous refrigerant is changed into liquid refrigerant after heat exchange in the air duct machine module 12, the liquid refrigerant is discharged from the liquid duct port through the corresponding expansion valve, enters the heat exchanger 21 of the outdoor unit 2 through the economizer 22 to absorb heat, returns to the four-way valve 3 from the fourth port 33 of the four-way valve 3 after heat absorption, enters the gas-liquid separator 23 from the third port 32 of the four-way valve 3, and finally returns to the compressor of the outdoor unit 2, the high-temperature high-pressure gaseous refrigerant entering the third pipe 4 enters the hot water module 13 from the water tank port, the high-temperature high-pressure gaseous refrigerant is changed into a liquid refrigerant after heat exchange is completed in the hot water module 13, the liquid refrigerant is discharged from the liquid pipe port through the corresponding expansion valve, enters the heat exchanger 21 of the outdoor unit 2 after passing through the economizer 22 to absorb heat, returns to the four-way valve 3 from the fourth port 33 of the four-way valve 3 after heat absorption, enters the gas-liquid separator 23 from the third port 32 of the four-way valve 3, and finally returns to the compressor of the outdoor unit 2;
when the air duct machine module 12 is started for refrigeration and the hot water module 13 is started, the expansion valve 100 of the air duct machine module 12 is opened for 300 steps, the expansion valve 200 of the hot water module 13 is opened for 450 steps, the expansion valve of the floor heating module 12 is opened for 40-60 steps, the outdoor unit 2 discharges compressed high-temperature and high-pressure gaseous refrigerant from the exhaust port into the four-way valve 3 and the third pipe 4, the high-temperature and high-pressure gaseous refrigerant entering the four-way valve 3 is discharged from the fourth opening 33 of the four-way valve 3 and enters the heat exchanger 21 for heat exchange to become liquid refrigerant, the liquid refrigerant enters the air duct machine module 12 from the liquid pipe port after passing through the economizer 22, the liquid refrigerant is changed into gaseous refrigerant after completing heat exchange in the air duct machine module 12, the gaseous refrigerant is discharged from the air pipe port through the corresponding expansion valve, then enters the four-way valve 3 from the second opening 31 of the four-way valve 3, is discharged from the four-way valve 3 from the third opening 32 to enter the gas-liquid separator 23, finally, the refrigerant returns to the compressor of the outdoor unit 2, the high-temperature and high-pressure gaseous refrigerant entering the third pipe 4 enters the hot water module 13 from the water tank port, the high-temperature and high-pressure gaseous refrigerant is changed into a liquid refrigerant after heat exchange is completed in the hot water module 13, the liquid refrigerant is discharged from the hot water module 13 through the corresponding expansion valve, and the discharged liquid refrigerant and the liquid refrigerant at the liquid pipe port are gathered together and then enter the air pipe machine module 12 to refrigerate the air pipe machine module 12;
when the air duct machine module 12 is started to heat and the floor heating module 11 is started, the expansion valves 200 and 400 of the air duct machine module 12 and the floor heating module 11 are opened, the expansion valve of the hot water module 13 is opened for 40-60 steps, the outdoor unit 2 discharges compressed high-temperature and high-pressure gaseous refrigerant from the exhaust port into the four-way valve 3, then discharges the compressed high-temperature and high-pressure gaseous refrigerant from the second opening 31 of the four-way valve 3, enters the air duct machine module 12 and the floor heating module 11 from the air duct port, the high-temperature and high-pressure gaseous refrigerant is changed into liquid refrigerant after heat exchange is completed in the air duct machine module 12 and the floor heating module 11, the liquid refrigerant is discharged from the liquid pipe port through the expansion valves corresponding to the air duct machine module 12 and the floor heating module 11, enters the heat exchanger 21 of the outdoor unit 2 through the economizer 22 to absorb heat, returns to the four-way valve 3 from the fourth port 33 of the four-way valve 3 after heat absorption, and enters the gas-liquid separator 23 from the third port 32 of the four-way valve 3, finally, returning to the compressor of the outdoor unit 2;
when the hot water module 13 and the floor heating module 11 are started, the expansion valves 200 and 400 of the hot water module 13 and the floor heating module 11 are opened, the expansion valve of the air duct machine module 12 is opened for 40-60 steps, the outdoor unit 2 discharges compressed high-temperature and high-pressure gaseous refrigerant from the exhaust port into the four-way valve 3 and the third pipe 4, the high-temperature and high-pressure gaseous refrigerant entering the four-way valve 3 is discharged from the second opening 31 of the four-way valve 3 and enters the floor heating module 11 from the air duct port, the high-temperature and high-pressure gaseous refrigerant is changed into liquid refrigerant after heat exchange in the floor heating module 11, the liquid refrigerant is discharged from the liquid duct port through the corresponding expansion valve, passes through the economizer 22 and then enters the heat exchanger 21 of the outdoor unit 2 for heat absorption, after heat absorption, returns to the four-way valve 3 from the fourth port 33 of the four-way valve 3, then enters the gas-liquid separator 23 from the third port 32 of the four-way valve 3, and finally returns to the compressor of the outdoor unit 2, the high-temperature high-pressure gaseous refrigerant entering the third pipe 4 enters the hot water module 13 from the water tank port, the high-temperature high-pressure gaseous refrigerant is changed into a liquid refrigerant after heat exchange is completed in the hot water module 13, the liquid refrigerant is discharged from the liquid pipe port through the corresponding expansion valve, enters the heat exchanger 21 of the outdoor unit 2 after passing through the economizer 22 to absorb heat, returns to the four-way valve 3 from the fourth port 33 of the four-way valve 3 after heat absorption, enters the gas-liquid separator 23 from the third port 32 of the four-way valve 3, and finally returns to the compressor of the outdoor unit 2;
when the hot water module 13 and the floor heating module 11 are started, and the ducted air conditioner module 12 is started to heat, the expansion valves 200 of the hot water module 13, the floor heating module 11 and the ducted air conditioner module 12 are opened for 400 steps, the outdoor unit 2 discharges compressed high-temperature and high-pressure gaseous refrigerant from the exhaust port into the four-way valve 3 and the third tube 4, the high-temperature and high-pressure gaseous refrigerant entering the four-way valve 3 is discharged from the second opening 31 of the four-way valve 3 and enters the floor heating module 11 and the ducted air conditioner module 12 from the air pipe port, the high-temperature and high-pressure gaseous refrigerant is converted into liquid refrigerant after heat exchange is completed in the floor heating module 11 and the ducted air conditioner module 12, the liquid refrigerant is discharged from the liquid pipe port through the expansion valves corresponding to the floor heating module 11 and the ducted air conditioner module 12, passes through the economizer 22 and then enters the heat exchanger 21 of the outdoor unit 2 to absorb heat, after heat absorption, returns to the four-way valve 3 from the fourth port 33 of the four-way valve 3, and then enters the gas-liquid separator 23 from the third port 32 of the four-way valve 3, and finally, returning to the compressor of the outdoor unit 2, wherein the high-temperature and high-pressure gaseous refrigerant entering the third pipe 4 enters the hot water module 13 from the water tank port, the high-temperature and high-pressure gaseous refrigerant is changed into a liquid refrigerant after heat exchange in the hot water module 13, the liquid refrigerant is discharged from the liquid pipe port through the corresponding expansion valve, enters the heat exchanger 21 of the outdoor unit 2 after passing through the economizer 22 to absorb heat, returns to the four-way valve 3 from the fourth port 33 of the four-way valve 3 after absorbing heat, enters the gas-liquid separator 23 from the third port 32 of the four-way valve 3, and finally returns to the compressor of the outdoor unit 2.
When any one of the hot water module 13, the floor heating module 11 and the air conditioner module 12 operates independently, the condensation temperature and the frequency output are controlled according to the operation module.
When the ducted air conditioner module 12 and the floor heating module 11 operate simultaneously, the frequency output is controlled according to the target condensing pressure of the ducted air conditioner module 12.
When the ducted air conditioner module 12 and the hot water module 13 are simultaneously operated, the frequency output is controlled according to the target condensing pressure of the ducted air conditioner module 12.
When the ground heating module 11 and the hot water module 13 operate simultaneously, the frequency output is controlled according to the target condensing pressure of the ground heating module 11.
When the ducted air conditioner module 12, the floor heating module 11 and the hot water module 13 are simultaneously turned on, the frequency output is controlled according to the target condensing pressure of the ducted air conditioner module 12.
TABLE 1 ducted chiller module refrigeration low pressure setpoint R (t)
TABLE 2 heating high pressure set value of air pipe machine module R (t) unit bar
TABLE 3 floor heating module heating high pressure set value R (t) unit bar
TABLE 4 heating high pressure set value R (t) of hot water module in bar
Finally, it should be noted that the above-mentioned list is only the specific embodiment of the present invention. Obviously, the present invention is not limited to the above embodiments, and many modifications are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (4)
1. A control method for heating water in a triple co-generation system during low-frequency running of an outdoor unit is characterized by comprising the following steps:
1) and judging whether the following two conditions are simultaneously met:
a) the air conditioner internal machine is in refrigeration operation, and an expansion valve corresponding to the air conditioner internal machine is opened;
b) when the hot water module runs, opening an expansion valve corresponding to the hot water module;
2) and if 1) is met, after the outdoor unit operates for a set time t, the following judgment is carried out: whether the condensation temperature of the system meets the temperature required by the hot water module or not is judged, if so, the system is kept to normally operate, if not, the fan of the outdoor unit is decelerated, and the electric control temperature is kept to be less than or equal to 85 DEG
And simultaneously reducing the opening size of the main expansion valve of the outdoor unit, and executing the step 2) again after the outdoor unit operates for a set time t) until the condensing temperature of the system meets the temperature required by the hot water module, or when the rotating speed of the fan of the outdoor unit is the lowest set rotating speed and the electric control temperature of the outdoor electric control module is more than 85 ℃, the fan of the outdoor unit is not decelerated and the opening size of the main expansion valve of the outdoor unit is the minimum set opening.
2. The method as claimed in claim 1, wherein the set time t in 2) is 5-15 minutes.
3. The method as claimed in claim 1, wherein the control range of the fan of the 2) middle outdoor unit is adjusted by one step when the speed of the fan is reduced.
4. The method as claimed in claim 1, wherein the expansion valve of the outdoor unit in 2) is adjusted to reduce the opening by 30%.
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