CN113639396A - Control method for air conditioning system - Google Patents
Control method for air conditioning system Download PDFInfo
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- CN113639396A CN113639396A CN202110968416.2A CN202110968416A CN113639396A CN 113639396 A CN113639396 A CN 113639396A CN 202110968416 A CN202110968416 A CN 202110968416A CN 113639396 A CN113639396 A CN 113639396A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000004378 air conditioning Methods 0.000 title claims abstract description 28
- 238000001816 cooling Methods 0.000 claims abstract description 69
- 230000001276 controlling effect Effects 0.000 claims description 59
- 230000001105 regulatory effect Effects 0.000 claims description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 27
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 239000003507 refrigerant Substances 0.000 description 7
- 230000033228 biological regulation Effects 0.000 description 5
- 239000000498 cooling water Substances 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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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
-
- 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
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F11/88—Electrical aspects, e.g. circuits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
-
- 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
- F24F2140/40—Damper positions, e.g. open or closed
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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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Signal Processing (AREA)
- Thermal Sciences (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Fluid Mechanics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to the technical field of air conditioners, and particularly provides a control method for an air conditioning system. The problem that the heat exchange efficiency is influenced due to the fact that a fan of a cooling tower of an existing air-conditioning system is poor in control mode is solved. Therefore, the air conditioning system comprises a water chilling unit and a cooling tower capable of exchanging heat with the water chilling unit, the water chilling unit comprises a compressor, the cooling tower comprises a fan, and the control method for the air conditioning system comprises the following steps: at the starting stage of the compressor, acquiring the ambient temperature of the cooling tower; controlling the rotating speed of the fan according to the ambient temperature of the cooling tower; in the stable operation stage of the compressor, acquiring the exhaust pressure and the absolute pressure ratio of the compressor; according to the exhaust pressure and/or the absolute pressure ratio of the compressor, the rotating speed of the fan is controlled so as to accurately control the rotating speed of the fan, and therefore the energy efficiency ratio of the whole machine is effectively improved, and the purposes of energy conservation and high efficiency are achieved.
Description
Technical Field
The invention relates to the technical field of air conditioners, and particularly provides a control method for an air conditioning system.
Background
With the continuous development of air conditioning technology, the complexity of air conditioning systems is higher and higher. In order to effectively improve the heat exchange efficiency of the air conditioning system, a plurality of existing air conditioning systems are provided with cooling towers. The cooling tower is a device which uses water as circulating coolant, absorbs heat from a water chilling unit and discharges the heat to the atmosphere so as to reduce the temperature of water. Specifically, the waste heat generated in industry or in a refrigeration air conditioner is dissipated by utilizing the principle that heat is taken away by volatilization of steam after water and air flow contact to perform heat exchange so as to generate steam, and the steam is evaporated to dissipate the heat so as to achieve the purposes of evaporation heat dissipation, convection heat transfer, radiation heat transfer and the like, so that the water temperature is reduced, and the normal operation of a system is ensured. Furthermore, the water chilling unit exchanges heat, the outlet water temperature of the cooling water passing through the condenser is higher, so the cooling water needs to pass through a cooling tower, and the cooling tower is used for exchanging heat between the cooling water carrying waste heat and air in the tower body, so that the waste heat is transmitted to the air and is dissipated into the atmosphere.
Of course, although the heat exchange efficiency of the air conditioning system can be improved to a certain extent by the existing method for adding the cooling tower, the cooling tower used in cooperation with the water chilling unit is generally independently controlled and has no linkage control method. Based on this, when the environmental temperature is reduced, the rotating speed of the fan of the cooling tower is always kept unchanged, so that the energy consumption of the fan of the cooling tower is increased, and the requirements of energy conservation and environmental protection cannot be met; or the rotating speed of the fan of the cooling tower is adjusted only according to the outlet water temperature of the cooling water of the water chilling unit, the adjusting mode is not only slow, but also inaccurate, and the problem of high energy consumption and resource waste is inevitably caused when the fan of the cooling tower keeps a high-speed running state all the year round.
Disclosure of Invention
The invention aims to solve the technical problem that the heat exchange efficiency is influenced due to the fact that the fan control mode of the cooling tower of the existing air conditioning system is poor.
The invention provides a control method for an air conditioning system, wherein the air conditioning system comprises a water chilling unit and a cooling tower capable of exchanging heat with the water chilling unit, the water chilling unit comprises a compressor, the cooling tower comprises a fan, and the control method comprises the following steps:
in the starting stage of the compressor, acquiring the ambient temperature of the cooling tower;
controlling the rotating speed of the fan according to the ambient temperature of the cooling tower;
in the stable operation stage of the compressor, acquiring the exhaust pressure and the absolute pressure ratio of the compressor;
and controlling the rotating speed of the fan according to the discharge pressure and/or the absolute pressure ratio of the compressor.
In a preferred embodiment of the above control method, the step of "controlling the rotation speed of the fan according to the ambient temperature of the cooling tower" includes:
and if the ambient temperature of the cooling tower is lower than a first preset temperature, controlling the fan to operate at a first preset rotating speed.
In a preferred embodiment of the above control method, the step of "controlling the rotation speed of the fan according to the ambient temperature of the cooling tower" further includes:
if the ambient temperature of the cooling tower is greater than or equal to the first preset temperature and less than a second preset temperature, controlling the fan to operate at a second preset rotating speed;
the second preset rotating speed is greater than the first preset rotating speed.
In a preferred embodiment of the above control method, the step of "controlling the rotation speed of the fan according to the ambient temperature of the cooling tower" further includes:
if the ambient temperature of the cooling tower is greater than or equal to the second preset temperature and less than a third preset temperature, controlling the fan to operate at a third preset rotating speed;
and the third preset rotating speed is greater than the second preset rotating speed.
In a preferred embodiment of the above control method, the step of "controlling the rotation speed of the fan according to the ambient temperature of the cooling tower" further includes:
if the ambient temperature of the cooling tower is greater than or equal to the third preset temperature, controlling the fan to operate at a fourth preset rotating speed;
and the fourth preset rotating speed is greater than the third preset rotating speed.
In a preferred embodiment of the above control method, the step of "controlling the rotation speed of the fan according to the discharge pressure and/or the absolute pressure ratio of the compressor" includes:
and if the exhaust pressure of the compressor is less than a first preset pressure, controlling the fan to operate at a first preset rotating speed for a preset time and then closing the fan.
In a preferred embodiment of the above control method, the step of "controlling the rotation speed of the fan according to the discharge pressure and/or the absolute pressure ratio of the compressor" further includes:
and if the exhaust pressure of the compressor is greater than or equal to the first preset pressure and smaller than a second preset pressure, controlling the fan to reduce the speed to the first preset rotating speed at a preset speed regulating frequency.
In a preferred embodiment of the above control method, the step of "controlling the rotation speed of the fan according to the discharge pressure and/or the absolute pressure ratio of the compressor" further includes:
if the exhaust pressure of the compressor is greater than or equal to the second preset pressure and smaller than a third preset pressure, and the absolute pressure ratio of the compressor is greater than or equal to a preset absolute pressure ratio, controlling the rotating speed of the fan to be unchanged; and/or
And if the exhaust pressure of the compressor is greater than or equal to the second preset pressure and smaller than a third preset pressure and the absolute pressure ratio of the compressor is smaller than the preset absolute pressure ratio, controlling the fan to reduce the speed to a third preset rotating speed at the preset speed regulating frequency.
In a preferred embodiment of the above control method, the step of "controlling the rotation speed of the fan according to the discharge pressure and/or the absolute pressure ratio of the compressor" further includes:
if the exhaust pressure of the compressor is greater than or equal to the third preset pressure and smaller than a fourth preset pressure, and the absolute pressure ratio of the compressor is greater than or equal to the preset absolute pressure ratio, controlling the fan to increase the speed to a fifth preset rotating speed at the preset speed regulating frequency; and/or
If the exhaust pressure of the compressor is greater than or equal to the third preset pressure and smaller than a fourth preset pressure and the absolute pressure ratio of the compressor is smaller than the preset absolute pressure ratio, controlling the fan to reduce the speed at the preset speed regulating frequency until the absolute pressure ratio of the compressor is greater than or equal to the preset absolute pressure ratio or the rotating speed of the fan is reduced to a third preset rotating speed;
wherein the fifth preset rotating speed is greater than the fourth preset rotating speed.
In a preferred embodiment of the above control method, the step of "controlling the rotation speed of the fan according to the discharge pressure and/or the absolute pressure ratio of the compressor" further includes:
if the exhaust pressure of the compressor is greater than or equal to the fourth preset pressure, controlling the rotating speed of the fan to be directly increased to a sixth preset rotating speed;
wherein the sixth preset rotating speed is greater than the fifth preset rotating speed.
Under the condition of adopting the technical scheme, the air conditioning system comprises a water chilling unit and a cooling tower capable of exchanging heat with the water chilling unit, wherein the water chilling unit comprises a compressor, the cooling tower comprises a fan, and the control method can control the rotating speed of the fan according to the ambient temperature of the cooling tower at the starting stage of the compressor; and in the stable operation stage of the compressor, the rotating speed of the fan is controlled according to the exhaust pressure and/or the absolute pressure ratio of the compressor so as to accurately control the rotating speed of the fan, thereby effectively improving the energy efficiency ratio of the whole machine and achieving the purposes of energy conservation and high efficiency.
Drawings
Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:
fig. 1 is a schematic view of the overall structure of an air conditioning system of the present invention;
FIG. 2 is a flow chart of the main steps of the control method of the present invention;
reference numerals: 11. a compressor; 12. an evaporator; 13. an electronic expansion valve; 14. a condenser; 15. a cooling tower; 151. a fan.
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. For example, the specification and the application scenario of the air conditioning system are not limited by the present invention, and technicians can set the specification and the application scenario according to actual use requirements.
It should be noted that in the description of the preferred embodiment, the terms of direction or positional relationship indicated by the terms "inside", "outside", and the like are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In addition, in the description of the present invention, unless otherwise explicitly specified or limited, the term "connected" is to be understood broadly, and may be, for example, directly connected, indirectly connected through an intermediate, or communicating 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.
Further, it should be noted that in the description of the present invention, although the steps of the control method of the present invention are described in a specific order in the present application, the order is not limited, and those skilled in the art may perform the steps in a different order without departing from the basic principle of the present invention.
Referring first to fig. 1, the overall structure of the air conditioning system of the present invention is schematically shown. As shown in fig. 1, specifically, the air conditioning system of the present invention includes a water chiller and a cooling tower 15 capable of exchanging heat with the water chiller, wherein the water chiller includes a refrigerant circulation loop, and a compressor 11, an evaporator 12, an electronic expansion valve 13 and a condenser 14 which are arranged on the refrigerant circulation loop, and a refrigerant continuously circulates between the evaporator 12 and the condenser 14 through the refrigerant circulation loop to realize heat exchange; the water in the cooling tower 15 can cool the refrigerant in the refrigerant circulation loop, so that the heat exchange efficiency of the water chilling unit is effectively improved; the cooling tower 15 further includes a fan 151 to assist in increasing the heat exchange efficiency. It should be noted that the present invention does not limit the specific structure of the water chilling unit and the cooling tower 15, and the technician can set the structure according to the actual use requirement.
Further, the air conditioning system of the present invention further includes an ambient temperature sensor disposed near the cooling tower 15, and the specific location is not limited, so as to detect the ambient temperature of the cooling tower 15, and a controller capable of acquiring the detection data of the ambient temperature sensor, and also capable of controlling the operation state of the air conditioning system, for example, controlling the rotation speed of the fan 151, and the like. It can be understood by those skilled in the art that the present invention does not limit the specific structure and model of the controller, and the controller may be the original controller of the air conditioning system, or may be a controller separately configured to execute the control method of the present invention, and the structure and model of the controller may be set by a technician according to actual use requirements.
Referring next to fig. 2, a flow chart of the main steps of the control method of the present invention is shown. As shown in fig. 2, based on the air conditioning system described in the above embodiment, the control method of the present invention mainly includes the following steps:
s1: at the starting stage of the compressor, acquiring the ambient temperature of the cooling tower;
s2: controlling the rotating speed of the fan according to the ambient temperature of the cooling tower;
s3: in the stable operation stage of the compressor, acquiring the exhaust pressure and the absolute pressure ratio of the compressor;
s4: and controlling the rotating speed of the fan according to the exhaust pressure and/or the absolute pressure ratio of the compressor.
Further, in step S1, during the start-up phase of the compressor 11, the controller can obtain the ambient temperature of the cooling tower 15. Next, in step S2, the controller can control the rotation speed of the fan 151 according to the ambient temperature of the cooling tower 15. That is, in the starting stage of the compressor 11, the rotation speed of the fan 151 is controlled according to the ambient temperature of the cooling tower 15, so that the rotation speed of the fan 151 can be always adapted to the ambient temperature of the cooling tower 15, and the energy efficiency ratio of the air conditioning system is effectively improved. It should be noted that, the present invention does not limit the specific control method, and a technician may set the control method according to the actual use requirement, and it is within the protection scope of the present invention as long as the rotation speed of the fan 151 is controlled according to the ambient temperature of the cooling tower 15 during the starting stage of the compressor 11; for example, a one-to-one correspondence relationship between the ambient temperature of the cooling tower 15 and the rotation speed of the fan 151 is established in advance, and the rotation speed of the fan 151 is determined by the correspondence relationship established in advance.
Further, in step S3, the controller acquires a discharge pressure and an absolute pressure ratio of the compressor 11 at a steady operation stage of the compressor 11. Next, in step S4, the controller can control the rotation speed of the fan 151 according to the discharge pressure and/or the absolute pressure ratio of the compressor 11. That is, at the stable operation stage of the compressor 11, the rotation speed of the fan 151 is controlled according to the discharge pressure and/or the absolute pressure ratio of the compressor 11, so that the rotation speed of the fan 151 can be always adapted to the operation state of the compressor 11, thereby effectively improving the refrigerant flow performance and further effectively improving the energy efficiency ratio of the whole machine. In addition, it should be noted that the present invention does not limit the specific control manner, and a technician may set the control manner according to the actual use requirement, and it belongs to the protection scope of the present invention as long as the rotation speed of the fan 151 is controlled according to the discharge pressure and/or the absolute pressure ratio of the compressor 11 in the stable operation stage of the compressor 11; for example, the rotation speed of the fan 151 may be controlled only according to the discharge pressure of the compressor 11, the rotation speed of the fan 151 may be controlled only according to the absolute pressure ratio of the compressor 11, or the rotation speed of the fan 151 may be controlled by both the discharge pressure of the compressor 11 and the absolute pressure ratio.
Specifically, in the present invention, the control logic of the fan 151 of the cooling tower 15 may be divided into two stages, one is a start-up stage of the compressor 11, and the other is a steady operation stage of the compressor 11.
As a preferred embodiment, in the case that the controller detects that the chilled water pump and the cooling water pump of the air conditioning system are turned on, and the compressor 11 is powered on and the actual rotation speed reaches 100rpm, the controller controls the fan 151 to be turned on and controls the rotation speed of the fan 151 according to the control logic that the compressor 11 is in the start-up phase. Of course, the above-mentioned manner for determining the start-up phase is not limited, and the technician may set the start-up phase according to the actual use requirement, for example, when the compressor 11 is turned on but the operation parameters thereof are not stable yet.
During the start-up phase of the compressor 11, the controller can control the rotation speed of the fan 151 according to the ambient temperature of the cooling tower 15. As a preferable control method, the ambient temperature of the cooling tower 15 and the rotation speed of the fan 151 are in positive correlation; that is, the lower the ambient temperature of cooling tower 15, the lower the rotation speed of fan 151, and the higher the ambient temperature of cooling tower 15, the higher the rotation speed of fan 151. Based on such control logic, the controller can accurately and effectively control the rotation speed of the fan 151 in the starting stage of the compressor 11, so as to improve the heat exchange efficiency of the water chilling unit to the maximum extent.
In a specific embodiment, the step of controlling the rotation speed of the fan according to the ambient temperature of the cooling tower specifically includes the following four conditions:
and if the ambient temperature of the cooling tower 15 is lower than the first preset temperature, controlling the fan 151 to operate at a first preset rotating speed. It should be noted that, the present invention does not limit the specific value of the first preset temperature, and a technician can set the first preset temperature to be 15 ℃ as an optimal set value according to the actual use requirement.
If the ambient temperature of the cooling tower 15 is greater than or equal to the first preset temperature and less than a second preset temperature, controlling the fan 151 to operate at a second preset rotation speed; the second preset rotating speed is greater than the first preset rotating speed. It should be noted that, the specific value of the second preset temperature is not limited in the present invention, and a technician can set the second preset temperature to be 25 ℃ as an optimal set value according to the actual use requirement.
If the ambient temperature of the cooling tower 15 is greater than or equal to the second preset temperature and less than a third preset temperature, controlling the fan 151 to operate at a third preset rotation speed; and the third preset rotating speed is greater than the second preset rotating speed. It should be noted that, the specific value of the third preset temperature is not limited in the present invention, and a technician may set the third preset temperature to be 35 ℃ as an optimal set value according to actual use requirements.
If the ambient temperature of the cooling tower is greater than or equal to the third preset temperature, controlling the fan to operate at a fourth preset rotating speed; and the fourth preset rotating speed is greater than the third preset rotating speed. It should be noted that, in the present invention, specific values of the first preset rotation speed, the second preset rotation speed, the third preset rotation speed, and the fourth preset rotation speed are not limited, and a technician may set the values according to actual needs.
In a preferred embodiment, in the case that the controller detects that the parameters of the compressor 11 are stably operated for a period of 5S (the specific time period is not set in a limiting manner), the controller determines that the compressor 11 enters a stable operation stage, and controls the rotation speed of the fan 151 according to the control logic that the compressor 11 is in the stable operation stage. It should be noted that, the present invention does not limit the specific determination condition for the compressor 11 entering the stable operation stage, and the technician can set the determination condition according to the actual use requirement, as long as the technician can accurately determine that the compressor 11 is already in the stable operation stage; for example, the determination may be made by the fluctuation range of each parameter of the compressor 11.
The controller can control the rotation speed of the fan 151 according to the discharge pressure and/or the absolute pressure ratio of the compressor 11 during the stable operation of the compressor 11.
Firstly, it should be noted that the present invention does not limit the manner of obtaining the discharge pressure and the absolute pressure ratio of the compressor 11, and the technician can set the discharge pressure and the absolute pressure ratio according to the actual use requirement; for example, the discharge pressure of the compressor 11 may be measured by a pressure sensor, and the absolute pressure ratio Pb of the compressor 11 is calculated by the following equation:
Pb＝(Pcd+1)/(Pcs+1)
where Pcd is the discharge pressure of the compressor 11 and Pcs is the suction pressure of the compressor 11.
In a specific embodiment, the step of controlling the rotation speed of the fan according to the discharge pressure and/or the absolute pressure ratio of the compressor specifically includes the following five conditions:
and if the discharge pressure of the compressor 11 is less than the first preset pressure, controlling the fan 151 to operate at the first preset rotation speed for a preset time period and then to be turned off. It should be noted that, the specific value of the first preset pressure is not limited by the present invention, and the technical staff can set the value according to the actual use requirement; as a preferred set value, the first preset pressure is 0.35 MPa; in addition, the invention does not limit the specific value of the preset duration, and technicians can set the value according to actual use requirements; as a preferable setting value, the preset time period may be set to 1 minute.
And if the discharge pressure of the compressor 11 is greater than or equal to the first preset pressure and less than a second preset pressure, controlling the fan 151 to reduce the speed to the first preset rotating speed at a preset speed regulating frequency. It should be noted that, the specific value of the second preset pressure is not limited in the present invention, and the technician can set the second preset pressure according to the actual use requirement; as a preferred set value, the second preset pressure is 0.55 MPa.
If the discharge pressure of the compressor 11 is greater than or equal to the second preset pressure and less than the third preset pressure, and the absolute pressure ratio of the compressor 11 is greater than or equal to the preset absolute pressure ratio, controlling the rotation speed of the fan 151 to be unchanged, that is, maintaining the current rotation speed; in addition, if the discharge pressure of the compressor 11 is greater than or equal to the second preset pressure and less than the third preset pressure, and the absolute pressure ratio of the compressor 11 is less than the preset absolute pressure ratio, the fan 151 is controlled to decrease to a third preset rotation speed at the preset speed regulation frequency. It should be noted that, in the present invention, no limitation is imposed on the specific values of the third preset pressure and the preset absolute pressure ratio, and a technician can set the values according to actual use requirements; as a preferable set value, the third preset pressure is 0.85MPa, and the preset absolute pressure ratio is 1.9.
If the discharge pressure of the compressor 11 is greater than or equal to the third preset pressure and less than the fourth preset pressure, and the absolute pressure ratio of the compressor 11 is greater than or equal to the preset absolute pressure ratio, controlling the fan 151 to increase the speed to a fifth preset rotation speed at the preset speed regulation frequency, wherein the fifth preset rotation speed is greater than the fourth preset rotation speed; in addition, if the discharge pressure of the compressor 11 is greater than or equal to the third preset pressure and less than the fourth preset pressure, and the absolute pressure ratio of the compressor 11 is less than the preset absolute pressure ratio, the fan 151 is controlled to reduce the speed at the preset speed regulation frequency until the absolute pressure ratio of the compressor 11 is greater than or equal to the preset absolute pressure ratio or the rotation speed of the fan 151 is reduced to the third preset rotation speed. It should be noted that, the specific value of the fourth preset pressure is not limited in the present invention, and the technical staff can set the fourth preset pressure according to the actual use requirement; as a preferred set value, the fourth preset pressure is 1.05 MPa.
If the discharge pressure of the compressor 11 is greater than or equal to the fourth preset pressure, controlling the rotation speed of the fan 151 to be directly increased to a sixth preset rotation speed; wherein the sixth preset rotating speed is greater than the fifth preset rotating speed.
In addition, it should be noted that, the invention does not make any limit to the specific value of the preset speed regulation frequency, and technicians can set the value according to actual use requirements; as a preferred setting, the preset speed regulation frequency is one gear regulated every 20S.
As a preferred arrangement, the fan 151 is provided with 14 gears, and the fan rotation speed corresponding to each gear is as follows:
it should be noted that, in the preferred embodiment, the first preset rotation speed corresponds to 1 st gear in the upper table, the second preset rotation speed corresponds to 2 nd gear in the upper table, the third preset rotation speed corresponds to 3 rd gear in the upper table, the fourth preset rotation speed corresponds to 4 th gear in the upper table, the fifth preset rotation speed corresponds to 12 th gear in the upper table, and the sixth preset rotation speed corresponds to 14 th gear in the upper table. It should be understood that this is not limiting, and the skilled person may set the number of gears of the fan 151 and the specific rotation speed corresponding to each gear according to the actual use requirement.
In addition, if the controller detects that the internal temperature of the cooling tower 15 is greater than or equal to the preset temperature, the controller controls the fan 151 to increase the speed to the sixth preset rotation speed. It should be noted that, the specific value of the preset temperature is not limited by the present invention, and the technical personnel can set the temperature according to the actual use requirement; as a preferred set point, the preset temperature is 42 ℃.
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. A control method for an air conditioning system, the air conditioning system comprising a chiller and a cooling tower capable of exchanging heat with the chiller, the chiller comprising a compressor, the cooling tower comprising a fan, the control method comprising:
in the starting stage of the compressor, acquiring the ambient temperature of the cooling tower;
controlling the rotating speed of the fan according to the ambient temperature of the cooling tower;
in the stable operation stage of the compressor, acquiring the exhaust pressure and the absolute pressure ratio of the compressor;
and controlling the rotating speed of the fan according to the discharge pressure and/or the absolute pressure ratio of the compressor.
2. The control method according to claim 1, wherein the step of controlling the rotation speed of the fan according to the ambient temperature of the cooling tower comprises:
and if the ambient temperature of the cooling tower is lower than a first preset temperature, controlling the fan to operate at a first preset rotating speed.
3. The control method according to claim 2, wherein the step of controlling the rotation speed of the fan according to the ambient temperature of the cooling tower further comprises:
if the ambient temperature of the cooling tower is greater than or equal to the first preset temperature and less than a second preset temperature, controlling the fan to operate at a second preset rotating speed;
the second preset rotating speed is greater than the first preset rotating speed.
4. The control method according to claim 3, wherein the step of controlling the rotation speed of the fan according to the ambient temperature of the cooling tower further comprises:
if the ambient temperature of the cooling tower is greater than or equal to the second preset temperature and less than a third preset temperature, controlling the fan to operate at a third preset rotating speed;
and the third preset rotating speed is greater than the second preset rotating speed.
5. The control method according to claim 4, wherein the step of controlling the rotation speed of the fan according to the ambient temperature of the cooling tower further comprises:
if the ambient temperature of the cooling tower is greater than or equal to the third preset temperature, controlling the fan to operate at a fourth preset rotating speed;
and the fourth preset rotating speed is greater than the third preset rotating speed.
6. The control method according to any one of claims 1 to 5, wherein the step of controlling the rotation speed of the fan according to the discharge pressure and/or the absolute pressure ratio of the compressor comprises:
and if the exhaust pressure of the compressor is less than a first preset pressure, controlling the fan to operate at a first preset rotating speed for a preset time and then closing the fan.
7. The control method according to claim 6, wherein the step of controlling the rotation speed of the fan according to the discharge pressure and/or the absolute pressure ratio of the compressor further comprises:
and if the exhaust pressure of the compressor is greater than or equal to the first preset pressure and smaller than a second preset pressure, controlling the fan to reduce the speed to the first preset rotating speed at a preset speed regulating frequency.
8. The control method according to claim 7, wherein the step of controlling the rotation speed of the fan according to the discharge pressure and/or the absolute pressure ratio of the compressor further comprises:
if the exhaust pressure of the compressor is greater than or equal to the second preset pressure and smaller than a third preset pressure, and the absolute pressure ratio of the compressor is greater than or equal to a preset absolute pressure ratio, controlling the rotating speed of the fan to be unchanged; and/or
And if the exhaust pressure of the compressor is greater than or equal to the second preset pressure and smaller than a third preset pressure and the absolute pressure ratio of the compressor is smaller than the preset absolute pressure ratio, controlling the fan to reduce the speed to a third preset rotating speed at the preset speed regulating frequency.
9. The control method according to claim 8, wherein the step of controlling the rotation speed of the fan according to the discharge pressure and/or the absolute pressure ratio of the compressor further comprises:
if the exhaust pressure of the compressor is greater than or equal to the third preset pressure and smaller than a fourth preset pressure, and the absolute pressure ratio of the compressor is greater than or equal to the preset absolute pressure ratio, controlling the fan to increase the speed to a fifth preset rotating speed at the preset speed regulating frequency; and/or
If the exhaust pressure of the compressor is greater than or equal to the third preset pressure and smaller than a fourth preset pressure and the absolute pressure ratio of the compressor is smaller than the preset absolute pressure ratio, controlling the fan to reduce the speed at the preset speed regulating frequency until the absolute pressure ratio of the compressor is greater than or equal to the preset absolute pressure ratio or the rotating speed of the fan is reduced to a third preset rotating speed;
wherein the fifth preset rotating speed is greater than the fourth preset rotating speed.
10. The control method according to claim 9, wherein the step of controlling the rotation speed of the fan according to the discharge pressure and/or the absolute pressure ratio of the compressor further comprises:
if the exhaust pressure of the compressor is greater than or equal to the fourth preset pressure, controlling the rotating speed of the fan to be directly increased to a sixth preset rotating speed;
wherein the sixth preset rotating speed is greater than the fifth preset rotating speed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114279049A (en) * | 2021-12-22 | 2022-04-05 | 珠海格力电器股份有限公司 | Refrigerating unit and control method for automatically optimizing frequency of variable frequency fan of refrigerating unit |
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