CN113137713A - Control method of air conditioning system and air conditioning system - Google Patents

Control method of air conditioning system and air conditioning system Download PDF

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Publication number
CN113137713A
CN113137713A CN202110261624.9A CN202110261624A CN113137713A CN 113137713 A CN113137713 A CN 113137713A CN 202110261624 A CN202110261624 A CN 202110261624A CN 113137713 A CN113137713 A CN 113137713A
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temperature
water
cooling water
preset
air conditioning
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CN113137713B (en
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张瑞台
李玉阁
王铁伟
张捷
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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Qingdao Haier Air Conditioner Gen Corp Ltd
Qingdao Haier Air Conditioning Electric Co Ltd
Haier Smart Home Co Ltd
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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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • 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
    • 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
    • F24F11/46—Improving electric energy efficiency or saving
    • 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
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • 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
    • F24F2140/20—Heat-exchange fluid temperature
    • 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)
  • 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)
  • Air Conditioning Control Device (AREA)
  • Other Air-Conditioning Systems (AREA)

Abstract

The invention belongs to the technical field of refrigeration equipment, and particularly provides a control method of an air conditioning system. The invention aims to solve the problem that the existing air-conditioning system is shut down due to low outdoor temperature in winter. To this end, the control method of the air conditioning system of the present inventionThe method comprises obtaining the difference value Delta T between the temperature of the chilled water and the indoor preset temperature1(ii) a Determining Delta T1Delta T difference in temperature from preset startingOpenerThe size of (d); when Δ T1＞△TOpenerJudging whether the temperature of the cooling water reaches a preset critical temperature for starting the cooling water or not; when the preset critical temperature of the cooling water start is not reached, controlling the water path switching device to switch to a second water path, controlling the chilled water pump to start, and controlling the cooling water pump to start; and when the preset critical temperature of the cooling water starting is reached, starting the compressor refrigerating system.

Description

Control method of air conditioning system and air conditioning system
Technical Field
The invention belongs to the technical field of refrigeration, and particularly provides a control method of an air conditioning system and the air conditioning system.
Background
With global warming, air conditioners have become indispensable electrical appliances for people's life industry production, and especially for air conditioning systems requiring refrigeration all year round, the design of a cold source of the air conditioning system is a key. The existing air conditioning system is completely refrigerated by a compressor, and the energy consumption is large. Especially in winter, the outdoor temperature is low, and the indoor and outdoor temperature difference is small, so that the air conditioning system is often stopped due to the undersize indoor and outdoor temperature difference, and even the compressor is damaged.
Accordingly, there is a need in the art for a new control method for an air conditioning system and an air conditioning system to solve the problem that the existing air conditioning system cannot be started due to too small pressure difference between the discharge pressure and the suction pressure of the compressor caused by low outdoor temperature and too small indoor and outdoor temperature difference.
Disclosure of Invention
The air conditioning system aims to solve the problems in the prior art, namely the problems that the air conditioning system cannot be started due to the fact that the air discharging and sucking pressure difference of a compressor is too small because the outdoor temperature is low and the indoor and outdoor temperature difference is too small in the conventional air conditioning system are solved. The invention provides a control method of an air conditioning system, which is characterized in that the air conditioning system comprises a compressor refrigeration system consisting of a compressor, a condenser, an electronic expansion valve and an evaporator which are sequentially connected by pipelines; the cooling tower, the first water path and the condenser are arranged outdoors; the cooling tower is connected with the condenser through the first water path and exchanges heat through a first heat exchanger; the cooling tower is connected with a third water path through a second water path and exchanges heat through a second heat exchanger; the first water channel and the second water channel are respectively connected with the cooling tower through a water channel switching device; the third water path and the evaporator are arranged indoors, and the third water path exchanges heat with the evaporator through a third heat exchanger; cooling water pumps are further arranged in the first water channel and the second water channel, and a freezing water pump is further arranged in the third water channel;
the control method of the air conditioning system comprises the following steps:
obtaining the difference value delta T between the temperature of the refrigerating water and the indoor preset temperature1(ii) a Determining Delta T1Delta T difference in temperature from preset startingOpenerThe size of (d); when Δ T1＞△TOpenerJudging whether the temperature of the cooling water reaches a preset critical temperature for starting the cooling water or not; when the preset critical temperature of the cooling water start is not reached, controlling the water path switching device to switch to the second water path, controlling the chilled water pump to start, and controlling the cooling water pump to start; and when the preset critical temperature of the cooling water starting is reached, starting the compressor refrigerating system.
In a preferred embodiment of the control method of the air conditioning system, the step of "starting the compressor refrigeration system when the preset critical temperature for starting the cooling water is reached" further includes: when the preset critical temperature of the cooling water starting is reached, the difference value delta T between the temperature of the freezing water and the temperature of the cooling water is judged2(ii) a When Δ T2And when the temperature is lower than the first preset temperature, starting the compressor refrigerating system.
In a preferred embodiment of the control method of the air conditioning system, the current Δ T is a function of the current Δ T1＞△TOpenerAnd the step of judging whether the temperature of the cooling water reaches the preset critical temperature of the starting of the cooling water further comprises the following steps: when Δ T1＞△TOpenerThen, the difference value Delta T between the indoor temperature and the outdoor temperature is obtained3(ii) a When Δ T3Judging whether the temperature of the cooling water reaches a preset critical temperature for starting the cooling water or not when the temperature is less than or equal to a second preset temperature; when Δ T3When the temperature is higher than a second preset temperature, controlling the waterway switching device to switch to the second waterway, controlling the cooling water pump to be started, and controlling the fan of the cooling tower to be started; and when the indoor temperature reaches the indoor preset temperature, controlling the cooling water pump to be closed, and controlling the fan of the cooling tower to be closed.
In a preferred embodiment of the control method of the air conditioning system, the current Δ T is1＞△TOpenerAnd after the step of judging whether the temperature of the cooling water reaches the preset critical temperature of the starting of the cooling water, the control method further comprises the following steps: when the preset critical temperature of the cooling water starting is reached, the compressor refrigerating system is directly started, the cooling water pump and the freezing water pump are controlled to be started, and the fan of the cooling tower is controlled to be started.
In a preferred embodiment of the control method of the air conditioning system, the difference Δ T between the temperature of the chilled water and the preset indoor temperature is obtained1Before, the control method further comprises: starting the chilled water pump; detecting whether the third waterway leaks water; and when no water leakage is detected, closing the chilled water pump.
In a preferred embodiment of the control method of the air conditioning system, the "determination Δ T" is performed1Delta T difference in temperature from preset startingOpenerAfter the step of "the control method further includes: when Δ T1≤△TOpenerThen, redetermine Δ T1Delta T difference in temperature from preset startingOpenerUp to DeltaT1＞△TOpener。
In a preferred embodiment of the control method of the air conditioning system, the judgment isDifference value delta T between cut-off freezing water temperature and cooling water temperature2"the control method further includes, after the step of: when Δ T2When the temperature is more than or equal to the first preset temperature, the difference value delta T between the temperature of the freezing water and the temperature of the cooling water is judged again2Up to DeltaT2< first preset temperature.
In a preferred embodiment of the control method of the air conditioning system, the current Δ T is3When the temperature is higher than the second preset temperature, controlling the waterway switching device to switch to the second waterway, controlling the cooling water pump to be started, and controlling the fan of the cooling tower to be started, wherein the control method further comprises the following steps: and when the indoor temperature does not reach the indoor preset temperature, judging whether the indoor temperature reaches the indoor preset temperature again until the indoor temperature reaches the indoor preset temperature.
The invention also provides an air conditioning system which is the air conditioning system in the technical scheme and is set to be capable of executing the control method in any one of the technical schemes.
The technical solution of the control method of the air conditioning system of the present invention is that the air conditioning system includes a compressor refrigeration system composed of a compressor, a condenser, an electronic expansion valve, and an evaporator, which are connected in sequence by pipelines; the cooling tower, the first water channel and the condenser are arranged outdoors; the cooling tower is connected with the condenser through the first water path and exchanges heat through the first heat exchanger; the cooling tower is connected with the third water path through a second water path and exchanges heat through a second heat exchanger; the first water channel and the second water channel are respectively connected with the cooling tower through a water channel switching device; the third water path and the evaporator are arranged indoors, and the third water path exchanges heat with the evaporator through the third heat exchanger; cooling water pumps are arranged in the first water path and the second water path, and a freezing water pump is arranged in the third water path; the control method of the air conditioning system comprises the following steps:
obtaining the difference value delta T between the temperature of the refrigerating water and the indoor preset temperature1(ii) a Determining Delta T1Delta T difference in temperature from preset startingOpenerThe size of (d); when in use△T1＞△TOpenerJudging whether the temperature of the cooling water reaches a preset critical temperature for starting the cooling water or not; when the preset critical temperature of the cooling water start is not reached, controlling the water path switching device to switch to a second water path, controlling the chilled water pump to start, and controlling the cooling water pump to start; and when the preset critical temperature of the cooling water starting is reached, starting the compressor refrigerating system.
Through the arrangement mode, the control method of the air conditioning system can still normally start the air conditioning system in a season with lower outdoor temperature, and the problem that the air conditioning system is stopped due to too small indoor and outdoor temperature difference is solved. Acquiring the temperature of the chilled water in a third water channel arranged indoors, thereby acquiring the difference value delta T between the temperature of the chilled water and the indoor preset temperature1Judgment of DeltaT1With a predetermined starting temperature Δ TOpenerWhen a size of (d) is1＞△TOpenerAnd when the temperature of the cooling water reaches the preset critical temperature of the cooling water start, the water path switching device is controlled to switch to a second water path to control the frozen water pump to be started and control the cooling water pump to be started.
When the outdoor temperature is lower, the temperature of the cooling water and the condenser side is lower, however, the indoor temperature is higher, and the temperature of the corresponding chilled water and the evaporator side is higher, so that the exhaust pressure in the compressor refrigeration system is low, and the suction pressure is high, so that the pressure difference between the exhaust side and the suction side of the compressor is greatly reduced, the compressor cannot be normally started, and even the compressor is damaged. The scheme judges the difference value delta T between the temperature of the freezing water and the indoor preset temperature1With a predetermined starting temperature Δ TOpenerWhen a size of (d) is1＞△TOpenerAnd in time, the representative indoor temperature is higher than the preset temperature of a user, and refrigeration and temperature reduction are needed. Then whether the temperature of the cooling water in the first outdoor water channel reaches the preset critical temperature of the starting of the cooling water is detected, the preset critical temperature of the starting of the cooling water is the temperature at which the compressor can be normally started, and if the temperature of the cooling water in the first outdoor water channel does not reach the temperature at which the compressor can be normally started, the water is controlledThe way auto-change over device switches over to the second water route to control frozen water pump and cooling water pump and open, the second water route passes through the heat transfer of second heat exchanger with the third water route, when making indoor temperature reduce, make outdoor microthermal cooling water and indoor high temperature's refrigerated water pass through the circulation heat transfer, rise cooling water temperature, and reduce the refrigerated water temperature, thereby increase compressor refrigerating system's pressure differential, it presets critical temperature to reach the cooling water start-up until the cooling water temperature, also when the temperature that the compressor can normally start, start compressor refrigerating system. The problem that the air conditioning system is shut down due to the fact that outdoor temperature is low, indoor and outdoor temperature difference is small, and compressor exhaust and suction pressure difference is too small is effectively solved, energy is saved, and damage caused by continuous work of the compressor due to the fact that indoor and outdoor pressure difference cannot rise for a long time is prevented.
Drawings
A control method of the air conditioning system and the air conditioning system will be described below with reference to the accompanying drawings. In the drawings:
FIG. 1 is a schematic diagram of an air conditioning system according to the present invention;
FIG. 2 is a flow chart of a control method of the air conditioning system of the present invention;
FIG. 3 is a flow chart of one embodiment of a method of controlling an air conditioning system of the present invention;
fig. 4 is a flowchart of another embodiment of a control method of an air conditioning system according to the present invention;
list of reference numerals:
1-compressor refrigeration system, 11-compressor, 12-condenser, 13-electronic expansion valve, 14-evaporator, 2-cooling tower, 3-first water path, 4-second water path, 5-third water path, 6-cooling water pump, 7-chilled water pump, 8-water path switching device and 9-third 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 only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. And can be adjusted as needed by those skilled in the art to suit particular applications.
It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the device 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," and "third" 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 otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1 and 2, in order to solve the problem that the air conditioning system cannot be started because the pressure difference of the exhaust gas minus the suction gas of the compressor is too small due to the low outdoor temperature and the too small indoor and outdoor temperature difference of the existing air conditioning system, the air conditioning system of the invention comprises a compressor refrigeration system 1 consisting of a compressor 11, a condenser 12, an electronic expansion valve 13 and an evaporator 14 which are sequentially connected by pipelines; the cooling tower 2, the first water channel 3 and the condenser 12 are arranged outdoors; the cooling tower 2 is connected with a condenser 12 through a first water path 3 and exchanges heat through a first heat exchanger (not shown in the figure); the cooling tower 2 is connected with a third water path 5 through a second water path 4 and exchanges heat through a second heat exchanger (not shown in the figure); the first water channel 3 and the second water channel 4 are respectively connected with the cooling tower 2 through a water channel switching device 8; the third water path 5 and the evaporator 14 are arranged indoors, and the third water path 5 exchanges heat with the evaporator 14 through a third heat exchanger; a cooling water pump 6 is arranged in the first water channel 3 and the second water channel 4, and a freezing water pump 7 is arranged in the third water channel 5;
the control method of the air conditioning system comprises the following steps:
step S4: obtaining the difference value delta T between the temperature of the refrigerating water and the indoor preset temperature1；
Step S5: determining Delta T1Delta T difference in temperature from preset startingOpenerThe size of (d);
step S6: when Δ T1＞△TOpenerJudging whether the temperature of the cooling water reaches a preset critical temperature for starting the cooling water or not;
step S7: when the preset critical temperature of the cooling water start is not reached, controlling the water path switching device to switch to a second water path, controlling the chilled water pump to start, and controlling the cooling water pump to start;
step S13: and when the preset critical temperature of the cooling water starting is reached, starting the compressor refrigerating system.
The setting mode has the advantages that: the control method of the air conditioning system can still normally start the air conditioning system in a season with lower outdoor temperature, and avoids the problem that the air conditioning system is shut down due to too small indoor and outdoor temperature difference. Acquiring the temperature of the chilled water in the third water channel 5 arranged indoors, thereby acquiring the difference value Delta T between the temperature of the chilled water and the preset indoor temperature1Judgment of DeltaT1With a predetermined starting temperature Δ TOpenerSize of (1), indoor preset temperature and delta TOpenerThe preferred indoor preset temperature is set for the user in advance to be 16-21℃, delta TOpenerIs 2 ℃. When Δ T1＞△TOpenerWhen the temperature of the cooling water reaches the preset critical temperature of the cooling water start, the critical temperature of the cooling water start is preset by a user, the optimal critical temperature of the cooling water start can be set to be 10-14 ℃, when the preset critical temperature of the cooling water start is not reached, the water path switching device 8 is controlled to be switched to the second water path 4, the freezing water pump 7 is controlled to be started, the cooling water pump 6 is controlled to be started, and when the preset critical temperature of the cooling water start is reached, the compressor refrigeration system 1 is started.
When the outdoor temperature is highWhen the temperature is low, the temperature of the cooling water is low, however, the indoor temperature is high, and the temperature of the corresponding chilled water is high, so that the exhaust pressure in the compressor refrigerating system 1 is low, and the suction pressure is high, thereby greatly reducing the pressure difference between the exhaust side and the suction side of the compressor, preventing the compressor 11 from being started normally, and even preventing the compressor from being damaged due to the long-time starting. The scheme judges the difference value delta T between the temperature of the freezing water and the indoor preset temperature1Delta T difference in temperature from preset startingOpenerWhen a size of (d) is1＞△TOpenerAnd in time, the representative indoor temperature is higher than the preset temperature of a user, and refrigeration and temperature reduction are needed. And then detects whether the temperature of the cooling water in the first water path 3 disposed outdoors reaches a cooling water start-up preset critical temperature, that is, the temperature of the cooling water when the compressor 11 can be normally started, if the temperature at which the compressor 11 can be normally started is not reached, the water passage switching device 8 is controlled to switch to the second water passage 4, and the freezing water pump 7 and the cooling water pump 6 are controlled to be started, the second water path 4 and the third water path 5 exchange heat through the second heat exchanger, so that the indoor temperature is reduced, the cooling water with low temperature outdoors and the freezing water with high temperature indoors are subjected to circulating heat exchange to increase the temperature of the cooling water and reduce the temperature of the freezing water, therefore, the pressure difference in the compressor refrigeration system 1 is increased, and the compressor refrigeration system 1 is started until the pressure difference meets the condition, namely the temperature of the cooling water reaches the preset critical temperature of the starting of the cooling water. The problem that when the outdoor temperature is low, the indoor and outdoor temperature difference is small, and the pressure difference of the compressor 11 during discharging and sucking is too small, so that the air conditioning system is stopped is effectively solved, energy is saved, and damage caused by continuous work of the compressor 11 due to the fact that the pressure difference cannot rise for a long time is prevented.
As shown in fig. 2, in a possible embodiment, after "controlling the cooling water pump to be turned on" in step S7, the control method of the present invention further includes:
step S8: and controlling the fan of the cooling tower to be started.
The setting mode has the advantages that: outdoor temperature is lower, and when indoor temperature is higher, for making the very fast reduction of indoor temperature, when cooling water pump 6 opened or after, the fan of control cooling tower 2 was opened, and the heat of the cooling water in the second water route 4 is taken away to the fan of cooling tower 2, makes the cooling water in the second water route 4 and the refrigerated water heat transfer of third water route 5 faster, and indoor temperature drops sooner, prevents that the high temperature from causing the damage to the interior equipment.
As shown in fig. 2 and 3, in one possible implementation, step S13: "when reaching the cooling water start-up preset critical temperature, start-up compressor refrigeration system" further includes:
step S131: when the preset critical temperature of the cooling water starting is reached, the difference value delta T between the temperature of the freezing water and the temperature of the cooling water is judged2；
Step S133: when Δ T2When the temperature is more than or equal to the first preset temperature, the difference value delta T between the temperature of the freezing water and the temperature of the cooling water is judged again2；
Step S132: delta T2If the temperature is lower than the first preset temperature, the compressor refrigeration system is started.
The setting mode has the advantages that: when the difference value Delta T between the chilled water temperature and the cooling water temperature2And when the temperature is lower than the first preset temperature, starting the compressor refrigerating system 1, wherein the first preset temperature is preset by a user, and the preferred first preset temperature is 0-2 ℃. When the temperature of the outdoor cooling water is close to that of the indoor chilled water, the temperature difference between the second water path 4 and the third water path 5 is too small, the cooling water reduces the heat in the chilled water, the indoor low temperature cannot be maintained, the indoor temperature is ensured, the phenomenon that the indoor temperature rises due to the fact that the cooling water and the chilled water cannot exchange heat is avoided, and then the compressor refrigeration system 1 is started to reduce the indoor temperature. Delta T2When more than or equal to first preset temperature, the difference of freezing water temperature and cooling water temperature is enough to maintain indoor temperature, can continue to be indoor cooling through the cooling water and the refrigerated water heat transfer, practices thrift the electric energy.
As shown in fig. 2 and 4, in one possible implementation, step S6: "when Δ T1＞△TOpenerAnd judging whether the temperature of the cooling water reaches the preset critical temperature of the starting of the cooling water further comprises the following steps:
step S601: when Δ T1＞△TOpenerWhen the temperature of the water is higher than the set temperature,obtaining the difference value Delta T between the indoor temperature and the outdoor temperature3；
Step S602: when Δ T3Judging whether the temperature of the cooling water reaches a preset critical temperature for starting the cooling water or not when the temperature is less than or equal to a second preset temperature;
step S603: when Δ T3When the temperature is higher than the second preset temperature, controlling the water path switching device to switch to a second water path, controlling the cooling water pump to be started, and controlling the fan of the cooling tower to be started;
step S604: when the indoor temperature does not reach the indoor preset temperature, whether the indoor temperature reaches the indoor preset temperature is judged again until the indoor temperature reaches the indoor preset temperature;
step S605: and when the indoor temperature reaches the indoor preset temperature, controlling the cooling water pump to be closed, and controlling the fan of the cooling tower to be closed.
The setting mode has the advantages that: when Δ T1＞△TOpenerWhen the temperature is increased, the indoor temperature needs to be adjusted, and the difference delta T between the indoor temperature and the outdoor temperature is obtained3When Δ T3At a second preset temperature or lower, a delta T3Preset for the user, preferred Δ T3And the temperature is 20-25 ℃, which means that the outdoor temperature is much lower than the indoor temperature, the water path switching device 8 is controlled to be switched to the second water path 4, the cooling water pump 6 is controlled to be started, the fan of the cooling tower 2 is controlled to be started, and when the indoor temperature reaches the indoor preset temperature, the cooling water pump 6 is controlled to be operated or closed at the minimum frequency, and the fan of the cooling tower 2 is controlled to be closed. When the outdoor temperature is lower than the indoor temperature by a second preset temperature, the outdoor water channel 4 and the indoor third water channel 5 can independently exchange heat, so that a large amount of power resources are saved for indoor cooling, and the air conditioner compressor 11 is prevented from being shut down or damaged due to too small pressure difference under the condition of extremely low temperature in winter.
As shown in fig. 2, in one possible implementation, at step S6: "when Δ T1＞△TOpenerAnd then, after judging whether the temperature of the cooling water reaches the preset critical temperature of the starting of the cooling water, the control method further comprises the following steps:
step S10: when the preset critical temperature of the cooling water start is reached, the compressor refrigerating system is directly started, the cooling water pump and the freezing water pump are controlled to be started, and the fan of the cooling tower is controlled to be started.
The setting mode has the advantages that: when the preset critical temperature of the cooling water starting is reached, namely the outdoor temperature is the temperature at which the compressor 11 can be normally started, the compressor refrigerating system 1 can be directly started, the cooling water pump 6 and the chilled water pump 7 are controlled to be started, and the fan of the cooling tower 2 is controlled to be started. After the first water path 3 and the condenser 12 exchange heat through the first heat exchanger, water in the first water path 3 is radiated through the fan of the cooling tower 2, so that heat of the condenser is more quickly radiated to the air, the indoor temperature is more quickly reduced, and meanwhile, energy is saved.
As shown in fig. 2, in one possible implementation, at step S4: ' obtaining the difference value Delta T between the temperature of the chilled water and the indoor preset temperature1"before, the control method further includes:
step S1: starting a freezing water pump;
step S2: detecting whether the third waterway leaks water;
step S3: when no water leakage is detected, the freezing water pump is closed;
step S11: when water leakage is detected, the water flow of the evaporator is low and an alarm is given;
step S12: and entering an alarm interruption module.
The setting mode has the advantages that: and checking whether the cooling water pump 6 leaks water, giving an alarm in time if the cooling water pump 6 leaks water, and entering an alarm interruption module to prevent the loss caused by the water leakage of the refrigerating water pump 7 after the unit is started.
As shown in fig. 2, in one possible implementation, at step S5: "determination of Delta T1Delta T difference in temperature from preset startingOpenerAfter the step (b), the control method further includes:
step S9: when Δ T1≤△TOpenerThen, redetermine Δ T1Delta T difference in temperature from preset startingOpenerUp to DeltaT1＞△TOpener。
The setting mode has the advantages that: the temperature of the indoor chilled water is continuously detected, and when the indoor temperature rises, the temperature of the chilled water is timely found, so that the unit is started to cool the indoor.
In summary, when the outdoor temperature is high in summer, the temperature is generally above 15 ℃, and when delta T is measured1＞△TOpenerWhen, indoor needs cooling down, cooling water temperature is higher than the cooling water all the time and starts to predetermine critical temperature, and air conditioning system's of this scheme water route auto-change over device 8 switches to first water route 3, direct operation compressor refrigerating system 1 to, for condenser 12 cooling through cooling tower 2, thereby accelerate indoor temperature's reduction. When the spring and autumn transition season, the outdoor temperature is generally 2-14 ℃, the outdoor temperature is lower than the indoor temperature, the temperature of cooling water on the condenser 12 side cannot reach the preset critical temperature of cooling water starting, the water path switching device 8 is switched to the second water path 4, the second water path 4 and the third water path 5 exchange heat through the second heat exchanger, and the cooling water and the chilled water circularly exchange heat, so that the indoor heat is transferred into the cooling water, the temperature of the chilled water is reduced, the temperature of the cooling water is correspondingly increased, the pressure difference of exhaust and suction is increased, and when the temperature of the cooling water reaches the preset critical temperature of the cooling water starting, the compressor refrigerating system 1 is started to prevent the compressor 11 from being damaged by directly starting the compressor 11. When the outdoor temperature is very low in winter, the outdoor temperature is below 2 ℃, the temperature difference between the indoor temperature and the outdoor temperature is larger than a second preset temperature, the water path switching device 8 is switched to the second water path 4, and the outdoor water path switching device directly exchanges heat with the indoor third water path 5 through the outdoor second water path 4 to cool the indoor. Because of the outdoor temperature is too low, the cooling water temperature of condenser 12 side can't reach the cooling water all the time and start and predetermine critical temperature, and the outdoor low temperature of accessible is indoor cooling, when reducing power consumption, makes air conditioning system when the unable start-up compressor refrigerating system 1 of extreme low temperature weather, and air conditioning system still can be for indoor cooling.
It should be noted that the above-mentioned embodiments are only used for illustrating the principle of the present invention, and are not intended to limit the protection scope of the present invention, and those skilled in the art can modify the above-mentioned structure so that the present invention can be applied to more specific application scenarios without departing from the principle of the present invention.
In addition, the invention also provides an air conditioning system which is provided with the control method in any one of the above embodiments.
Finally, it should be noted that the above-mentioned embodiments are only used for illustrating the principle of the present invention, and are not intended to limit the protection scope of the present invention, and those skilled in the art can modify the above-mentioned structures so that the present invention can be applied to more specific application scenarios without departing from the principle of the present invention.
For example, in an alternative embodiment, the cooling tower 2 of the present invention may be other cooling devices, such as a cooling water line, for exchanging heat and cold with the outside temperature, without departing from the principle of the present invention, and therefore, falling within the scope of the present invention.
For example, in an alternative embodiment, the compressor 11 of the present invention may be constituted by at least one compressor. When the compressor 11 includes two or more compressors, the compressors may be connected in parallel, the input ends of the compressors are used as the input ends of the compressors 11, and the output ends of the compressors are used as the output ends of the compressors 11, without departing from the principle of the present invention, and therefore, the present invention is intended to fall within the protection scope of the present invention.
For example, in an alternative embodiment, the waterway switching device 8 of the present invention may be an electric three-way valve or a one-way valve, or may be an on-off valve in other forms, as long as the waterway switching device has a function of switching on and off, which do not depart from the principle of the present invention, and thus, the waterway switching device falls into the protection scope of the present invention.
For example, in an alternative embodiment, the air conditioning system of the present invention may be an air-cooled screw air conditioning system, a water-cooled screw air conditioning system, an air-cooled scroll air conditioning system, or a water-cooled scroll air conditioning system, etc., as long as it has the effect of reducing the temperature of the room, without departing from the principles of the present invention, and thus fall within the scope of the present invention.
Those skilled in the art will appreciate that the air conditioning system described above may also include other well-known structures such as processors, controllers, memories, etc., wherein the memories include, but are not limited to, ram, flash, rom, prom, volatile, nvm, serial, parallel, registers, etc., and the processors include, but are not limited to, CPLD/FPGC, DSP, CRM, MIPS, etc. Such well-known structures are not shown in the drawings in order to not unnecessarily obscure embodiments of the present disclosure.
So far, the technical solutions of the present invention have 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 the present invention is obviously not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can fall into the protection scope of the invention.

Claims (10)

1. The control method of the air conditioning system is characterized in that the air conditioning system comprises a compressor refrigeration system which consists of a compressor, a condenser, an electronic expansion valve and an evaporator which are sequentially connected through pipelines;
the cooling tower, the first water path and the condenser are arranged outdoors;
the cooling tower is connected with the condenser through the first water path and exchanges heat through a first heat exchanger;
the cooling tower is connected with a third water path through a second water path and exchanges heat through a second heat exchanger;
the first water channel and the second water channel are respectively connected with the cooling tower through a water channel switching device;
the third water path and the evaporator are arranged indoors, and the third water path exchanges heat with the evaporator through a third heat exchanger;
cooling water pumps are further arranged in the first water channel and the second water channel, and a freezing water pump is further arranged in the third water channel;
the control method of the air conditioning system comprises the following steps:
obtaining the difference value delta T between the temperature of the refrigerating water and the indoor preset temperature1；
Determining Delta T1Delta T difference in temperature from preset startingOpenerThe size of (d);
when Δ T1＞△TOpenerJudging whether the temperature of the cooling water reaches a preset critical temperature for starting the cooling water or not;
when the preset critical temperature of the cooling water start is not reached, controlling the water path switching device to switch to the second water path, controlling the chilled water pump to start, and controlling the cooling water pump to start;
and when the preset critical temperature of the cooling water starting is reached, starting the compressor refrigerating system.
2. The control method of an air conditioning system according to claim 1, wherein after the step of "controlling the cooling water pump to be turned on", the control method further comprises:
and controlling the fan of the cooling tower to be started.
3. The method as claimed in claim 1, wherein the step of starting the compressor refrigerating system when the preset critical temperature for starting the cooling water is reached further comprises:
when the preset critical temperature of the cooling water starting is reached, the difference value delta T between the temperature of the freezing water and the temperature of the cooling water is judged2；
When Δ T2And when the temperature is lower than the first preset temperature, starting the compressor refrigerating system.
4. The control method of air conditioning system according to claim 1, wherein "current Δ T1＞△TOpenerAnd the step of judging whether the temperature of the cooling water reaches the preset critical temperature of the starting of the cooling water further comprises the following steps:
when Δ T1＞△TOpenerThen, the difference value Delta T between the indoor temperature and the outdoor temperature is obtained3；
When Δ T3Judging whether the temperature of the cooling water reaches a preset critical temperature for starting the cooling water or not when the temperature is less than or equal to a second preset temperature;
when Δ T3When the temperature is higher than a second preset temperature, controlling the waterway switching device to switch to the second waterway, controlling the cooling water pump to be started, and controlling the fan of the cooling tower to be started;
and when the indoor temperature reaches the indoor preset temperature, controlling the cooling water pump to be closed, and controlling the fan of the cooling tower to be closed.
5. The control method of air conditioning system according to claim 1, characterized in that at current Δ T1＞△TOpenerAnd after the step of judging whether the temperature of the cooling water reaches the preset critical temperature of the starting of the cooling water, the control method further comprises the following steps:
when the preset critical temperature of the cooling water starting is reached, the compressor refrigerating system is directly started, the cooling water pump and the freezing water pump are controlled to be started, and the fan of the cooling tower is controlled to be started.
6. The control method of an air conditioning system according to claim 1, wherein the difference Δ T between the temperature of the chilled water and the indoor preset temperature is obtained1Before, the control method further comprises:
starting the chilled water pump;
detecting whether the third waterway leaks water;
and when no water leakage is detected, closing the chilled water pump.
7. The control method of air conditioning system according to claim 1, characterized in that at the "judgment Δ T1Delta T difference in temperature from preset startingOpenerAfter the step of "the control method further includes:
when Δ T1≤△TOpenerThen, redetermine Δ T1Delta T difference in temperature from preset startingOpenerUp to DeltaT1＞△TOpener。
8. The control method of an air conditioning system according to claim 3, wherein the difference Δ T between the chilled water temperature and the cooling water temperature is judged2"the control method further includes, after the step of:
when Δ T2When the temperature is more than or equal to the first preset temperature, the difference value delta T between the temperature of the freezing water and the temperature of the cooling water is judged again2Up to DeltaT2< first preset temperature.
9. The control method of air conditioning system according to claim 4, characterized in that at current Δ T3When the temperature is higher than the second preset temperature, controlling the waterway switching device to switch to the second waterway, controlling the cooling water pump to be started, and controlling the fan of the cooling tower to be started, wherein the control method further comprises the following steps:
and when the indoor temperature does not reach the indoor preset temperature, judging whether the indoor temperature reaches the indoor preset temperature again until the indoor temperature reaches the indoor preset temperature.
10. An air conditioning system, characterized in that the air conditioning system is the air conditioning system of claim 1, and the air conditioning system is provided so as to be able to perform the control method of any one of claims 1 to 9.
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JP2002071228A (en) * 2000-08-24 2002-03-08 Zexel Valeo Climate Control Corp Control device for refrigerating cycle
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