CN113137710A - Control method of evaporative condenser unit - Google Patents
Control method of evaporative condenser unit Download PDFInfo
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- CN113137710A CN113137710A CN202110349138.2A CN202110349138A CN113137710A CN 113137710 A CN113137710 A CN 113137710A CN 202110349138 A CN202110349138 A CN 202110349138A CN 113137710 A CN113137710 A CN 113137710A
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- 238000000034 method Methods 0.000 title claims abstract description 64
- 238000001816 cooling Methods 0.000 claims abstract description 38
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 75
- 238000013507 mapping Methods 0.000 claims description 20
- 239000003507 refrigerant Substances 0.000 claims description 14
- 239000007921 spray Substances 0.000 claims description 8
- 239000000725 suspension Substances 0.000 abstract description 20
- 238000001704 evaporation Methods 0.000 abstract description 12
- 230000008020 evaporation Effects 0.000 abstract description 11
- 239000002699 waste material Substances 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 6
- 230000001276 controlling effect Effects 0.000 description 16
- 239000007788 liquid Substances 0.000 description 16
- 238000005507 spraying Methods 0.000 description 13
- 230000006870 function Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 230000002596 correlated effect Effects 0.000 description 2
- 238000005339 levitation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000001932 seasonal effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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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- Mathematical Physics (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention belongs to the technical field of air conditioners, and particularly relates to a control method of an evaporative condenser unit. The invention aims to solve the problem of energy waste of the whole existing magnetic suspension evaporation-cooling direct expansion unit. For this purpose, according to the control method provided by the invention, the outdoor fan is controlled based on the current pressure ratio and the current external environment temperature, and when the natural cooling effect can meet the requirement of normal operation of the evaporative condenser unit, the outdoor fan is turned off to save energy; and turning on the outdoor fan when necessary to enable the evaporative condenser unit to normally operate. Therefore, the problem of energy waste can be avoided while the normal operation of the suspension evaporation cooling direct expansion unit is ensured.
Description
Technical Field
The invention belongs to the technical field of air conditioners, and particularly relates to a control method of an evaporative condenser unit.
Background
The magnetic suspension evaporation cooling direct expansion unit comprises a magnetic suspension main machine part and an indoor air cooler part. The magnetic suspension main machine part comprises main components such as a magnetic suspension compressor, an evaporative cooling type condenser, a liquid storage device, a gas-liquid separator and the like. The magnetic suspension compressor discharges compressed high-temperature and high-pressure gas into the evaporative condenser through the one-way valve, refrigerant liquid discharged from the evaporative condenser enters the liquid storage device, then an economizer can be added or not added, the refrigerant liquid flows into a room through the electromagnetic valve, is split by the branch pipe and then is reduced in pressure by the thermostatic expansion valve to enter air coolers of different rooms for cooling the room, and the evaporated gas is gathered and enters the gas-liquid separator. The superheated low-temperature low-pressure gas in the gas-liquid separator enters the compressor through the suction pipe.
At present, a water tank is arranged at the bottom of an existing evaporative condenser, a heat exchange coil is arranged at the upper part of the water tank, a spraying device is arranged above the heat exchange coil, a water pump is arranged between the spraying device and the water tank, and a fan is arranged above the spraying device. During the process of adjusting the magnetic suspension evaporation cooling direct expansion unit, the operation frequency and the suction pressure of the magnetic suspension compressor, the opening degree of the electronic expansion valve and other working parameters are mainly adjusted. The whole working parameters of the evaporative condenser are not adjusted, so that the problem of energy waste of the whole magnetic suspension evaporative cooling direct expansion unit is caused.
Accordingly, there is a need in the art for a new evaporative condenser unit control method that addresses the above-mentioned problems.
Disclosure of Invention
In order to solve the problems in the prior art, namely to solve the problem that the whole existing magnetic suspension evaporation cooling direct expansion unit has energy waste, the invention provides a control method of an evaporative condenser unit.
In the control method of the evaporative condenser unit, the evaporative condenser unit comprises a heat exchange coil connected in a refrigerant circulating system and an outdoor fan for cooling the heat exchange coil; the control method comprises the following steps: acquiring the current external environment temperature, the current exhaust pressure and the current suction pressure of a compressor in a refrigerant circulating system; determining a current pressure ratio based on a ratio of the current exhaust pressure to the current suction pressure; and controlling the outdoor fan based on the current pressure ratio and the current external environment temperature.
As a preferable technical solution of the above control method provided by the present invention, the step of controlling the outdoor fan based on the current pressure ratio and the current ambient temperature includes: controlling the rotating speed of the outdoor fan based on the current pressure ratio and in combination with a pre-established first mapping relation between the current pressure ratio and the rotating speed of the outdoor fan; in the first mapping relationship, a positive correlation is formed between the rotating speed of the outdoor fan and the pressure ratio.
As a preferable technical solution of the above control method provided by the present invention, the step of controlling the outdoor fan based on the current pressure ratio and the current ambient temperature includes: determining a lowest set pressure ratio of discharge pressure to suction pressure of the compressor under the current ambient temperature condition based on the current ambient temperature; calculating an actual pressure ratio difference between the current pressure ratio and the lowest set pressure ratio; comparing the actual pressure ratio difference with a first preset pressure ratio difference and a second preset pressure ratio difference respectively; wherein the first preset pressure ratio difference is less than the second preset pressure ratio difference; and if the difference value of the actual pressure ratios is smaller than the difference value of the first preset pressure ratios, the outdoor fan is closed, and if the difference value of the actual pressure ratios is larger than the difference value of the second preset pressure ratios, the outdoor fan is opened.
As a preferable technical solution of the above control method provided by the present invention, the control method further includes: acquiring the current water temperature of the water storage tank; determining the lowest set water temperature of the water storage tank under the current external environment temperature condition based on the current external environment temperature; calculating the actual temperature difference between the current water temperature and the lowest set water temperature; comparing the actual temperature difference with a first preset temperature difference and a second preset temperature difference respectively; wherein the first preset temperature difference is less than or equal to the second preset temperature difference; if the actual temperature difference is smaller than the first preset temperature difference, the outdoor fan is closed, and if the actual temperature difference is larger than the second preset temperature difference, the outdoor fan is opened.
As a preferable technical solution of the above control method provided by the present invention, in the control method, the outdoor fan is turned on as long as one of the following conditions is satisfied: 1) the actual pressure ratio difference is greater than the second preset pressure ratio difference; 2) and if the actual temperature difference is greater than the second preset temperature difference, starting the outdoor fan.
As a preferable technical solution of the above control method provided by the present invention, the evaporative condenser unit further includes a spray device for cooling the heat exchange coil, the spray device is connected to the water storage tank through a water pump, and the spray device is configured such that water sprayed from the spray device cools the heat exchange coil and then flows back to the water storage tank, and the control method further includes: controlling the water pump based on the current exhaust pressure, the current pressure ratio, and the current ambient temperature.
As a preferable technical solution of the above control method provided by the present invention, in the step of "controlling the water pump based on the current exhaust pressure, the current pressure ratio and the current ambient temperature", the water pump is turned on if one of the following conditions is satisfied when the current exhaust pressure is greater than a first preset exhaust pressure threshold: 1) the current pressure ratio is greater than a first preset pressure ratio threshold; 2) the current exhaust pressure is greater than a second preset exhaust pressure threshold; wherein the second preset exhaust pressure threshold is greater than the first preset exhaust pressure threshold.
As a preferable technical solution of the above control method provided by the present invention, in the step of "controlling the water pump based on the current exhaust pressure, the current pressure ratio and the current ambient temperature", when the current exhaust pressure is smaller than a first preset pressure ratio threshold, the water pump is turned off as long as one of the following conditions is satisfied: 1) the current exhaust pressure is less than a third exhaust pressure threshold that is less than the first exhaust pressure threshold and the second exhaust pressure threshold; 2) the current pressure ratio value is less than a second preset pressure ratio threshold, which is less than the first preset pressure ratio threshold.
As a preferred technical solution of the control method provided by the present invention, based on the current ambient temperature, and in combination with a second mapping relationship between the pre-established ambient temperature and the first preset exhaust pressure threshold, the second preset exhaust pressure threshold, and the third preset exhaust pressure threshold, the first preset exhaust pressure threshold, the second preset exhaust pressure threshold, and the third preset exhaust pressure threshold are respectively determined; and in the second mapping relation, the first preset exhaust pressure threshold value, the second preset exhaust pressure threshold value and the third preset exhaust pressure threshold value are all in positive correlation with the current external environment temperature.
As a preferable technical solution of the above control method provided by the present invention, the step of controlling the water pump based on the current exhaust pressure, the current pressure ratio, and the current ambient temperature includes: and controlling the rotating speed of the water pump based on the current exhaust pressure and the current pressure ratio and in combination with a pre-established third mapping relation between the current exhaust pressure and the current pressure ratio under different external environment temperature conditions and the rotating speed of the water pump.
According to the control method of the evaporative condenser unit, the outdoor fan is controlled based on the current pressure ratio and the current external environment temperature, and when the natural cooling effect can meet the requirement of normal operation of the evaporative condenser unit, the outdoor fan is turned off to save energy; and turning on the outdoor fan when necessary to enable the evaporative condenser unit to normally operate. Therefore, the problem of energy waste can be avoided while the normal operation of the suspension evaporation cooling direct expansion unit is ensured.
According to the control method of the evaporative condenser unit, the water pump is controlled based on the current exhaust pressure, the current pressure ratio and the current external environment temperature, when the current exhaust pressure and the current pressure ratio are lower than preset values, the situation that the normal operation requirement of the evaporative condenser unit cannot be met through outdoor fan cooling is shown, and at the moment, the water pump can be started and the spraying device is used for spraying to cool the heat exchange coil pipe, so that the normal operation of the evaporative condenser unit is ensured.
Drawings
The control method of the evaporative condenser unit of the present invention will now be described with reference to the accompanying drawings. In the drawings:
FIG. 1 is a schematic structural diagram of a magnetic suspension evaporative cooling direct expansion unit according to the present embodiment;
fig. 2 is a schematic flow chart of a control method of the evaporative condenser unit according to this embodiment.
List of reference numerals
1-a compressor; 11-a first pressure sensor; 12-a second pressure sensor; 13-a one-way valve; 14-a load balancing valve; 15-bypass solenoid valve; 16-a bypass expansion valve;
2-an evaporative condenser; 21-outdoor fan; 22-a spray device; 23-a water pump; 24-a water storage tank; 25-a first temperature sensor; 26-a second temperature sensor;
3-a liquid reservoir; 31-an electric ball valve; 32-a cooling expansion valve;
41-indoor evaporator; 42-indoor fan; 43-thermostatic expansion valve; 44-solenoid valves;
5-gas-liquid separator.
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.
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, e.g., as being fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; 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. Furthermore, it should be noted that the terms "first", "second" and "third" in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In order to solve the above problems in the prior art, that is, to solve the problem that the whole existing magnetic suspension evaporation cooling direct expansion unit has energy waste, the embodiment provides a control method of an evaporative condenser unit. This embodiment will describe the control method of the evaporative condenser unit by taking the magnetic suspension evaporative cooling direct expansion unit as an example as shown in fig. 1.
In the magnetic levitation evaporative cooling/direct expansion unit shown in fig. 1, along a refrigerant circulation circuit, a refrigerant flows out from an exhaust port of the compressor 1 and flows back to an intake port of the compressor 1 through the check valve 13, the evaporative condenser 2, the accumulator 3, the electric ball valve 31, the solenoid valve 44, the thermostatic expansion valve 43 (which may be an electronic expansion valve), the indoor evaporator 41, and the gas-liquid separator 5 in this order. The compressor 1 is a magnetic levitation compressor, a first pressure sensor 11 for detecting the discharge pressure of the compressor 1 is provided at the discharge port of the compressor 1, and a second pressure sensor 12 for detecting the suction pressure of the compressor 1 is provided at the suction port of the compressor 1. The electric ball valve 31 is used for controlling a main switch for controlling whether the refrigerant flows into the room, each room is independently provided with an electromagnetic valve 44, a thermostatic expansion valve 43 and an indoor evaporator 41, the indoor evaporator 41 is further provided with an indoor fan 42, and the thermostatic expansion valve 43 and the electromagnetic valve 44 are used for controlling the indoor evaporator 41 of each room.
Further, the evaporative condenser unit of the present embodiment includes the evaporative condenser 2, and the evaporative condenser 2 includes a heat exchange coil for heat exchange between a refrigerant and the outside; a water storage tank 24 is arranged at the bottom of the evaporative condenser 2, a spraying device 22 is arranged above the evaporative condenser 2, a water pump 23 is arranged between the spraying device 22 and the water storage tank 24, and an outdoor fan 21 is arranged above the spraying device 22. Wherein the evaporative condenser unit further comprises a first temperature sensor 25 for monitoring the temperature of the external environment and a second temperature sensor for monitoring the temperature of the water in the water storage tank 24.
Further, a bypass solenoid valve 15 and a bypass expansion valve 16 are disposed in parallel between the exhaust port of the compressor 1 and the inlet of the gas-liquid separator 5, and the bypass solenoid valve 15 may be opened to reduce the ratio of the exhaust pressure to the suction pressure of the compressor 1 when necessary. In addition, when the magnetic suspension evaporation cooling direct expansion unit stops, part of the refrigerant flows back to the compressor through the bypass expansion valve 16, so that the purpose of assisting the compressor 1 to stop is achieved. A load balancing valve 14 is also provided between the outlet of the check valve 13 and the inlet of the gas-liquid separator 5, and is mainly used for energy regulation and surge control of the compressor 1. The magnetic suspension compressor can set a target suction pressure value through the touch screen, and controls the evaporation pressure of the indoor evaporator 41 by controlling the suction pressure of the suction port. Meanwhile, energy is adjusted according to the suction pressure, and the purpose of reducing the indoor temperature to the required temperature can be achieved.
The liquid refrigerant from the accumulator 3 enters two cooling circuits, one is a liquid jet cooling circuit of the compressor 1, and the other is a cooling circuit from the cooling expansion valve 32 to the gas-liquid separator 5, so as to adjust when the suction superheat degree of the gas-liquid separator 5 is too high.
In the magnetic suspension evaporation cooling direct expansion unit shown in fig. 1, the compressor 1 can control the indoor evaporator 41 on the indoor side through only one communication line. Only the communication line is needed to know whether the indoor evaporator 41 is running or is completely closed, and the number and the state of the indoor evaporators 41 running at the indoor side are not needed to be known, so that the control process of the suspension evaporation cooling and direct expansion unit is simplified.
In the control method of the evaporative condenser unit provided in this embodiment, the evaporative condenser unit includes a heat exchange coil connected to the refrigerant circulation system, and an outdoor fan 21 for cooling the heat exchange coil; as shown in fig. 2, the control method includes:
s101, obtaining the current external environment temperature, the current exhaust pressure and the current suction pressure of the compressor 1 in the refrigerant circulating system.
For example, the current ambient temperature may be obtained by the first temperature sensor 25 in fig. 1, the current discharge pressure of the compressor 1 may be obtained by the first pressure sensor 11, and the current suction pressure of the compressor 1 may be obtained by the second pressure sensor 12.
And S102, determining a current pressure ratio based on the ratio of the current exhaust pressure to the current suction pressure.
For example, the ratio of the current exhaust pressure to the current suction pressure may be directly used as the current pressure ratio, or the ratio of the current exhaust pressure to the current suction pressure may be corrected and used as the current pressure ratio.
And S103, controlling the outdoor fan 21 based on the current pressure ratio and the current external environment temperature.
As a preferred implementation manner of the above control method provided in this embodiment, step S103 may include: controlling the rotating speed of the outdoor fan 21 based on the current pressure ratio in combination with a first mapping relation between the current pressure ratio and the rotating speed of the outdoor fan 21, wherein the first mapping relation is established in advance; in the first mapping relationship, the rotation speed and the pressure ratio of the outdoor fan 21 are positively correlated.
It can be understood that the larger the rotation speed of the outdoor fan 21 is, the more the power consumption is, and the purpose of saving energy when the cooling requirement is met can be achieved by controlling the rotation speed of the outdoor fan 21 according to the current pressure ratio. Meanwhile, the positive correlation between the rotation speed and the pressure ratio of the outdoor fan 21 can be interpreted as any one of the following: 1) the rotating speed of the outdoor fan 21 is in a gradient ascending trend along with the increase of the pressure ratio; 2) the rotating speed of the outdoor fan 21 is in a direct proportion increasing function relation with the increase of the pressure ratio; 3) the rotation speed of the outdoor fan 21 is in a rising curve trend with the increase of the pressure ratio, and the like, which are only exemplified herein, and the implementation of the positive correlation between the rotation speed and the pressure ratio of the outdoor fan 21 is not limited to the description herein. The first mapping relationship may be expressed in the form of a table or a function. In the first mapping relationship, when the current pressure ratio is smaller than a certain threshold, the outdoor fan 21 may be turned off, that is, the rotation speed of the outdoor fan 21 is controlled to be 0.
As a preferred implementation of the above control method provided in this embodiment, step S103 includes: s1031, determining the lowest set pressure ratio of the exhaust pressure and the suction pressure of the compressor under the current external environment temperature condition based on the current external environment temperature; s1032, calculating an actual pressure ratio difference value between the current pressure ratio and the lowest set pressure ratio; s1033, comparing the actual pressure ratio difference value with a first preset pressure ratio difference value and a second preset pressure ratio difference value respectively; the first preset pressure ratio difference value is smaller than the second preset pressure ratio difference value, and the first preset pressure ratio difference value and the second preset pressure ratio difference value can be determined according to experience or experiments; s1034, if the actual pressure ratio difference is smaller than the first preset pressure ratio difference, it indicates that the evaporative condenser 2 has an excellent cooling effect at the current external environment temperature, for example, in an extremely cold environment such as winter, even if the outdoor fan 21 is turned off, the outdoor fan 21 may be turned off; and if the actual pressure ratio difference is larger than the second preset pressure ratio difference, the outdoor fan 21 is started.
For example, in step S1031, the current wet bulb temperature may be calculated by combining the current external environment temperature with the relative humidity (determined by table lookup) of the current season of the region, then the saturated condensing temperature of the evaporative condenser 2 is determined according to the sum of the current wet bulb temperature and the approach temperature of the evaporative condenser 2 (determined by the cooling performance of the evaporative condenser 2 itself), then the saturated condensing temperature of the evaporative condenser 2 is converted into the condensing pressure, and the ratio of the condensing pressure to the evaporating pressure is used as the lowest set pressure ratio of the discharge pressure to the suction pressure of the compressor under the current external environment temperature condition.
As a preferable embodiment of the above control method provided in the present embodiment, as a control method of the outdoor fan 21 that can be used alone or in cooperation with the above steps S101 to S103, the control method of the present embodiment further includes: s201, acquiring the current water temperature of the water storage tank 24; s202, determining the lowest set water temperature of the water storage tank 24 under the current external environment temperature condition based on the current external environment temperature; s203, calculating the actual temperature difference between the current water temperature and the lowest set water temperature; comparing the actual temperature difference with a first preset temperature difference and a second preset temperature difference respectively; wherein the first preset temperature difference is less than or equal to the second preset temperature difference; and S204, if the actual temperature difference is smaller than the first preset temperature difference, the outdoor fan 21 is turned off, and if the actual temperature difference is larger than the second preset temperature difference, the outdoor fan 21 is turned on.
For example, in step S201, the current water temperature of the water storage tank 24 may be acquired by the second temperature sensor 26. In step S202, the current wet bulb temperature may be calculated by combining the current ambient temperature with the current seasonal relative humidity of the area (determined by a table lookup method), and the wet temperature is the lowest set water temperature of the water storage tank 24 under the current ambient temperature condition. In step S203, the first preset temperature difference and the second preset temperature difference may be determined empirically or experimentally.
As a preferred implementation of the control method provided in this embodiment, in the control method, the outdoor fan 21 is turned on as long as one of the following conditions is satisfied: 1) the actual pressure ratio difference is greater than a second preset pressure ratio difference; 2) and if the actual temperature difference is larger than the second preset temperature difference, the outdoor fan 21 is started.
Therefore, the outdoor fan 21 is controlled to be opened and closed based on the lowest set pressure ratio of the exhaust pressure and the suction pressure of the compressor and the lowest set water temperature of the water storage tank under the current external environment temperature condition, so that the outdoor fan 21 can ensure a better energy-saving effect when the evaporative condenser unit operates normally.
It can be understood that, in the control method of the evaporative condenser unit provided in this embodiment, the outdoor fan 21 is controlled to save energy by combining the external environment temperature and the local humidity condition. Different wet bulb temperatures and the lowest temperature to which the water storage tank 24 can be lowered are provided at different external environment temperatures, and the temperature at which the outdoor fan 21 is turned off is higher than the temperature, otherwise the outdoor fan 21 is always turned on but has a small cooling effect, which causes energy waste. The operation of the evaporative condenser unit can be made more reliable if the judgment of the turning on and off of the outdoor fan 21 is made in conjunction with the ratio of the discharge pressure to the suction pressure of the compressor 1.
According to the control method of the evaporative condenser unit of the embodiment, the outdoor fan 21 is controlled based on the current pressure ratio and the current external environment temperature, and when the natural cooling effect can meet the requirement of the evaporative condenser unit on normal operation, the outdoor fan 21 is turned off to save energy; and the outdoor fan 21 is turned on as needed to enable the evaporative condenser unit to operate normally. Therefore, the problem of energy waste can be avoided while the normal operation of the suspension evaporation cooling direct expansion unit is ensured.
As a preferred embodiment of the above control method provided in this embodiment, as shown in fig. 1, the evaporative condenser unit further includes a spraying device 22 for cooling the heat exchange coil, the spraying device 22 is connected to the water storage tank 24 through a water pump 23, and the spraying device 22 is configured such that the sprayed water cools the heat exchange coil and then flows back to the water storage tank 24, and the control method of this embodiment further includes: s3, the water pump 23 is controlled based on the current exhaust pressure, the current pressure ratio, and the current ambient temperature.
As a preferable implementation of the above control method provided by the present embodiment, in step S3, when the current exhaust pressure is greater than the first preset exhaust pressure threshold, the water pump 23 is turned on as long as one of the following conditions is satisfied: 1) the current pressure ratio is greater than a first preset pressure ratio threshold; 2) the current exhaust pressure is greater than a second preset exhaust pressure threshold; wherein the second preset exhaust pressure threshold is greater than the first preset exhaust pressure threshold.
It can be understood that the first preset exhaust pressure threshold, the first preset pressure ratio threshold and the second preset exhaust pressure threshold are taken as the basis for judging the water pump 23 to be turned on, so that the operation of the evaporative condenser unit is more reliable and energy-saving.
As a preferable implementation of the above control method provided by the present embodiment, in step S3, when the current exhaust pressure is smaller than the first preset pressure ratio threshold, the water pump 23 is turned off as long as one of the following conditions is satisfied: 1) the current exhaust pressure is less than a third exhaust pressure threshold, which is less than the first exhaust pressure threshold and the second exhaust pressure threshold; 2) the current pressure ratio value is less than a second preset pressure ratio threshold, which is less than the first preset pressure ratio threshold.
It will be appreciated that the first preset pressure ratio threshold, the third exhaust pressure threshold and the second preset pressure ratio threshold are taken together as the basis for judging that the water pump 23 is turned off, so that the operation of the evaporative condenser unit is more reliable and energy-saving.
As a preferred implementation of the control method provided by this embodiment, based on the current external environment temperature, and in combination with a second mapping relationship between the pre-established external environment temperature and the first preset exhaust pressure threshold, the second preset exhaust pressure threshold, and the third preset exhaust pressure threshold, the first preset exhaust pressure threshold, the second preset exhaust pressure threshold, and the third preset exhaust pressure threshold are respectively determined; and in the second mapping relation, the first preset exhaust pressure threshold, the second preset exhaust pressure threshold and the third preset exhaust pressure threshold are positively correlated with the current external environment temperature. The second mapping relationship may be expressed in the form of a table or a function.
As a preferred implementation of the above control method provided in this embodiment, in step S3, the rotation speed of the water pump 23 may be further controlled based on the current exhaust pressure and the current pressure ratio, and in combination with a third mapping relationship between the current exhaust pressure and the current pressure ratio and the rotation speed of the water pump 23 under different pre-established external environment temperature conditions. The second mapping relationship may be expressed in the form of a table or a function.
According to the control method of the evaporative condenser unit of the embodiment, the water pump 23 is controlled based on the current exhaust pressure, the current pressure ratio and the current external environment temperature, when the current exhaust pressure and the current pressure ratio are lower than preset values, it is indicated that the normal operation requirement of the evaporative condenser unit cannot be met through the cooling of the outdoor fan 21, at this time, the water pump 23 can be started, and the heat exchange coil is cooled through the spraying of the spraying device, so that the normal operation of the evaporative condenser unit is ensured.
Of course, the above alternative embodiments, and the alternative embodiments and the preferred embodiments can also be used in a cross-matching manner, so that a new embodiment is combined to be suitable for a more specific application scenario.
It should be noted that although the detailed steps of the method of the present invention have been described in detail, those skilled in the art can combine, separate and change the order of the above steps without departing from the basic principle of the present invention, and the modified technical solution does not change the basic concept of the present invention and thus falls into the protection scope of the present invention.
It should be understood by those skilled in the art that the control method of the evaporative condenser unit provided in the present embodiment may be stored as a program in a computer-readable storage medium. The storage medium includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor (processor) to perform some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims of the present invention, any of the claimed embodiments may be used in any combination.
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 evaporative condenser unit is characterized in that the evaporative condenser unit comprises a heat exchange coil connected in a refrigerant circulating system and an outdoor fan for cooling the heat exchange coil; the control method comprises the following steps:
acquiring the current external environment temperature, the current exhaust pressure and the current suction pressure of a compressor in a refrigerant circulating system;
determining a current pressure ratio based on a ratio of the current exhaust pressure to the current suction pressure;
and controlling the outdoor fan based on the current pressure ratio and the current external environment temperature.
2. The control method according to claim 1, wherein the step of controlling the outdoor fan based on the current pressure ratio and the current outside environment temperature includes:
controlling the rotating speed of the outdoor fan based on the current pressure ratio and in combination with a pre-established first mapping relation between the current pressure ratio and the rotating speed of the outdoor fan;
in the first mapping relationship, a positive correlation is formed between the rotating speed of the outdoor fan and the pressure ratio.
3. The control method according to claim 1, wherein the step of controlling the outdoor fan based on the current pressure ratio and the current outside environment temperature includes:
determining a lowest set pressure ratio of discharge pressure to suction pressure of the compressor under the current ambient temperature condition based on the current ambient temperature;
calculating an actual pressure ratio difference between the current pressure ratio and the lowest set pressure ratio;
comparing the actual pressure ratio difference with a first preset pressure ratio difference and a second preset pressure ratio difference respectively; wherein the first preset pressure ratio difference is less than the second preset pressure ratio difference;
and if the difference value of the actual pressure ratios is smaller than the difference value of the first preset pressure ratios, the outdoor fan is closed, and if the difference value of the actual pressure ratios is larger than the difference value of the second preset pressure ratios, the outdoor fan is opened.
4. The control method according to claim 3, characterized by further comprising:
acquiring the current water temperature of the water storage tank;
determining the lowest set water temperature of the water storage tank under the current external environment temperature condition based on the current external environment temperature;
calculating the actual temperature difference between the current water temperature and the lowest set water temperature;
comparing the actual temperature difference with a first preset temperature difference and a second preset temperature difference respectively; wherein the first preset temperature difference is less than or equal to the second preset temperature difference;
if the actual temperature difference is smaller than the first preset temperature difference, the outdoor fan is closed, and if the actual temperature difference is larger than the second preset temperature difference, the outdoor fan is opened.
5. The control method according to claim 4, wherein in the control method, the outdoor fan is turned on as long as one of the following conditions is satisfied:
1) the actual pressure ratio difference is greater than the second preset pressure ratio difference;
2) and if the actual temperature difference is greater than the second preset temperature difference, starting the outdoor fan.
6. The control method according to claim 1, wherein the evaporative condenser unit further comprises a spray device for cooling the heat exchange coil, the spray device is connected with a water storage tank through a water pump, and the spray device is configured such that sprayed water flows back into the water storage tank after cooling the heat exchange coil, and the control method further comprises:
controlling the water pump based on the current exhaust pressure, the current pressure ratio, and the current ambient temperature.
7. The control method according to claim 6, characterized in that, in the step of "controlling the water pump based on the current exhaust pressure, the current pressure ratio, and the current outside ambient temperature", the water pump is turned on if one of the following conditions is satisfied in a case where the current exhaust pressure is greater than a first preset exhaust pressure threshold value:
1) the current pressure ratio is greater than a first preset pressure ratio threshold;
2) the current exhaust pressure is greater than a second preset exhaust pressure threshold; wherein the second preset exhaust pressure threshold is greater than the first preset exhaust pressure threshold.
8. The control method according to claim 7, characterized in that, in the step of "controlling the water pump based on the current exhaust pressure, the current pressure ratio, and the current ambient temperature", in the case where the current exhaust pressure is smaller than a first preset pressure ratio threshold, the water pump is turned off as long as one of the following conditions is satisfied:
1) the current exhaust pressure is less than a third exhaust pressure threshold that is less than the first exhaust pressure threshold and the second exhaust pressure threshold;
2) the current pressure ratio value is less than a second preset pressure ratio threshold, which is less than the first preset pressure ratio threshold.
9. The control method according to claim 8, characterized in that the first preset exhaust pressure threshold, the second preset exhaust pressure threshold and the third preset exhaust pressure threshold are respectively determined based on the current ambient temperature in combination with a second mapping relationship between a pre-established ambient temperature and the first preset exhaust pressure threshold, the second preset exhaust pressure threshold and the third preset exhaust pressure threshold;
and in the second mapping relation, the first preset exhaust pressure threshold value, the second preset exhaust pressure threshold value and the third preset exhaust pressure threshold value are all in positive correlation with the current external environment temperature.
10. The control method according to claim 6, wherein the step of controlling the water pump based on the current exhaust pressure, the current pressure ratio, and the current ambient temperature includes:
and controlling the rotating speed of the water pump based on the current exhaust pressure and the current pressure ratio and in combination with a pre-established third mapping relation between the current exhaust pressure and the current pressure ratio under different external environment temperature conditions and the rotating speed of the water pump.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2622183A (en) * | 2022-05-04 | 2024-03-13 | Coopertec Systems Ltd | Evaporative condenser operating as either water heater or condenser |
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