CN113137710B - Control method of evaporative condenser unit - Google Patents
Control method of evaporative condenser unit Download PDFInfo
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- CN113137710B CN113137710B CN202110349138.2A CN202110349138A CN113137710B CN 113137710 B CN113137710 B CN 113137710B CN 202110349138 A CN202110349138 A CN 202110349138A CN 113137710 B CN113137710 B CN 113137710B
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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
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 cold direct expansion unit. For this purpose, according to the control method of 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 normal operation requirement of the evaporative condenser unit, the outdoor fan is closed to save energy; and turning on the outdoor fan when necessary to enable the evaporative condenser set to operate normally. Therefore, the normal operation of the suspension evaporation direct expansion unit is ensured, and the problem of energy waste can be avoided.
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 direct expansion unit comprises a magnetic suspension main machine part and an indoor air cooler part. The magnetic suspension main machine part comprises a magnetic suspension compressor, an evaporation cooling type condenser, a liquid storage device, a gas-liquid separator and other main components. The magnetic suspension compressor discharges compressed high-temperature 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 the liquid storage device can be added with or without an economizer, the liquid enters the room through the electromagnetic valve, the liquid enters the room through the split flow of the split manifold and then is reduced in pressure through the thermal expansion valve, the air cooler in different rooms cools the room, and the evaporated gas is collected and enters the gas-liquid separator. The superheated low-temperature low-pressure gas in the gas-liquid separator enters the compressor through the gas suction pipe.
At present, the bottom of the existing evaporative condenser is provided with a water tank, the upper part of the water tank is a heat exchange coil, 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. In the process of adjusting the magnetic suspension evaporation cold direct expansion unit, the operating 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 regulated, so that the problem of energy waste exists in the whole magnetic suspension evaporation cold direct expansion unit.
Accordingly, there is a need in the art for a new method of controlling an evaporative condenser unit to address the above-described problems.
Disclosure of Invention
In order to solve the problems in the prior art, namely the problem of energy waste of the whole existing magnetic suspension evaporation cold direct expansion unit, the invention provides a control method of an evaporation condenser unit.
In the control method of the evaporative condenser unit provided by the invention, the evaporative condenser unit comprises a heat exchange coil pipe connected to a refrigerant circulation system and an outdoor fan for cooling the heat exchange coil pipe; 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 circulation system; determining a current pressure ratio based on a ratio of the current discharge 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 external 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 relation, the rotation speed of the outdoor fan and the pressure ratio are positively correlated.
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 external environment temperature includes: determining a lowest set pressure ratio of discharge pressure to suction pressure of the compressor at the current ambient temperature 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 actual pressure ratio difference is smaller than the first preset pressure ratio difference, closing the outdoor fan, and if the actual pressure ratio difference is larger than the second preset pressure ratio difference, opening the outdoor fan.
As a preferable technical scheme of the control method provided by the invention, the control method further comprises: 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; and if the actual temperature difference is smaller than the first preset temperature difference, closing the outdoor fan, and if the actual temperature difference is larger than the second preset temperature difference, opening the outdoor fan.
As a preferable technical scheme of the control method provided by the invention, in the control method, the outdoor fan is started 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 larger than the second preset temperature difference, starting the outdoor fan.
As a preferable technical scheme of the control method provided by the invention, the evaporative condenser unit further comprises a spraying device for cooling the heat exchange coil, the spraying device is connected with a water storage tank through a water pump, and the spraying device is arranged to return water to the water storage tank after the sprayed water cools the heat exchange coil, and the control method further comprises: and controlling the water pump based on the current exhaust pressure, 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, in the step of controlling the water pump based on the current exhaust pressure, the current pressure ratio, and the current external environment temperature, if the current exhaust pressure is greater than a first preset exhaust pressure threshold, the water pump is started 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.
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 external environment temperature, if 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 is less than a second preset pressure ratio threshold that is less than the first preset pressure ratio threshold.
As a preferable technical scheme of the control method provided by the invention, based on the current external environment temperature, and in combination with a second mapping relation between a 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 relationship, positive correlation is formed among the first preset exhaust pressure threshold, the second preset exhaust pressure threshold, the third preset exhaust pressure threshold 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 water pump based on the current exhaust pressure, the current pressure ratio, and the current external environment 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 third mapping relation between the current exhaust pressure and the current pressure ratio under different pre-established 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 closed to save energy; and turning on the outdoor fan when necessary to enable the evaporative condenser set to operate normally. Therefore, the normal operation of the suspension evaporation direct expansion unit is ensured, and the problem of energy waste can be avoided.
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 the preset values, the condition that the cooling by the outdoor fan cannot meet the requirement of normal operation of the evaporative condenser unit is indicated, and at the moment, the water pump can be started and the heat exchange coil is cooled by spraying by the spraying device, 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 is described below with reference to the drawings. In the accompanying drawings:
fig. 1 is a schematic structural diagram of a magnetic levitation evaporation cold direct expansion unit according to the embodiment;
fig. 2 is a flow chart of a control method of the evaporative condenser unit according to the present 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-a bypass solenoid valve; 16-a bypass expansion valve;
2-evaporative condenser; 21-an outdoor fan; 22-spraying device; 23-a water pump; 24-a water storage tank; 25-a first temperature sensor; 26-a second temperature sensor;
3-a reservoir; 31-an electric ball valve; 32-cooling expansion valve;
41-an indoor evaporator; 42-an indoor fan; 43-thermal expansion valve; 44-an electromagnetic valve;
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 merely for explaining the technical principles 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances. Furthermore, it should be noted that in the description of the present invention, the terms "first," "second," and "third" 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 of energy waste existing in the whole existing magnetic suspension evaporation cold direct expansion unit, the embodiment provides a control method of an evaporation condenser unit. The control method of the evaporative condenser unit will be described with reference to the magnetic levitation evaporative direct expansion unit shown in fig. 1.
In the magnetic levitation evaporation direct expansion unit shown in fig. 1, along a refrigerant circulation circuit, a refrigerant flows out from an exhaust port of a compressor 1 and flows back to an intake port of the compressor 1 through a check valve 13, an evaporation condenser 2, a liquid reservoir 3, an electric ball valve 31, an electromagnetic valve 44, a thermal expansion valve 43 (which may be an electronic expansion valve), an indoor evaporator 41, and a 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 end 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 end of the compressor 1. The electric ball valve 31 is used for controlling whether the refrigerant flows to a main switch in the room, each room is independently provided with a solenoid valve 44, a thermal expansion valve 43 and an indoor evaporator 41, the indoor evaporator 41 is also provided with an indoor fan 42, and the thermal expansion valve 43 and the solenoid valve 44 are used for controlling the indoor evaporator 41 in each room.
Further, the evaporative condenser unit of the present embodiment includes the above-mentioned evaporative condenser 2, and the evaporative condenser 2 includes a heat exchange coil for heat exchange between the refrigerant and the outside; the bottom of the evaporative condenser 2 is provided with a water storage tank 24, 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. 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 water temperature of the water storage tank 24.
Further, a bypass solenoid valve 15 and a bypass expansion valve 16 are also provided in parallel between the discharge 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 discharge pressure to the suction pressure of the compressor 1 as needed. In addition, when the magnetic suspension evaporation cold direct expansion unit is stopped, part of refrigerant flows back to the compressor through the bypass expansion valve 16, so that the purpose of assisting the stopping of the compressor 1 is achieved. A load balancing valve 14 is also arranged between the outlet of the one-way valve 13 and the inlet of the gas-liquid separator 5, and is mainly used for energy adjustment and surge control of the compressor 1. The magnetic levitation compressor can set a target suction pressure value through a touch panel, and control the suction pressure of the suction port to thereby control the evaporation pressure of the indoor evaporator 41. Meanwhile, energy adjustment is carried out according to the suction pressure, so that the aim of reducing the indoor temperature to the required temperature can be fulfilled.
The liquid refrigerant led out from the liquid reservoir 3 enters two cooling circuits respectively, one is a liquid spray cooling circuit of the compressor 1, and the other is a cooling circuit which passes through the cooling expansion valve 32 to the gas-liquid separator 5 so as to adjust when the suction superheat of the gas-liquid separator 5 is too high.
In the magnetic levitation evaporation direct expansion unit shown in fig. 1, the compressor 1 can control the indoor evaporator 41 at 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 on the specific indoor side are not needed to be known, so that the control process of the suspension evaporation direct expansion unit is simplified.
In the control method of the evaporative condenser unit provided by the embodiment, the evaporative condenser unit comprises a heat exchange coil connected to a refrigerant circulation system and an outdoor fan 21 for cooling the heat exchange coil; as shown in fig. 2, the control method includes:
s101, acquiring the current external environment temperature, the current discharge pressure and the current suction pressure of the compressor 1 in the refrigerant circulation system.
Illustratively, 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.
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 discharge pressure to the current suction pressure may be directly referred to as the current pressure ratio, or the ratio of the current discharge pressure to the current suction pressure may be corrected to be referred to 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 of the above control method provided in the present embodiment, step S103 may include: controlling the rotation speed of the outdoor fan 21 based on the current pressure ratio and in combination with a first mapping relation between the pre-established current pressure ratio and the rotation speed of the outdoor fan 21; in the first map, there is a positive correlation between the rotational speed of the outdoor fan 21 and the pressure ratio.
It can be understood that the larger the rotation speed of the outdoor fan 21 is, the larger the power consumption is, and the rotation speed of the outdoor fan 21 is controlled according to the current pressure ratio, so that the aim of saving energy when meeting the cooling requirement can be achieved. Meanwhile, a 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 rotation speed of the outdoor fan 21 increases with the increase of the pressure ratio and has a step-up trend; 2) The rotation speed of the outdoor fan 21 is in a proportional increasing function relation with the increase of the pressure ratio; 3) The implementation of a positive correlation between the rotational speed of the outdoor fan 21 and the pressure ratio is not limited to the description herein, and the rotational speed of the outdoor fan 21 increases with the increase of the pressure ratio, and the like, as exemplified herein. The first mapping relation can 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, i.e. the rotation speed of the outdoor fan 21 is controlled to be 0.
As a preferred implementation of the above control method provided in the present embodiment, step S103 includes: s1031, determining the lowest set pressure ratio of the discharge 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 with a first preset pressure ratio difference and a second preset pressure ratio difference respectively; the first preset pressure ratio difference is smaller than the second preset pressure ratio difference, and the first preset pressure ratio difference and the second preset pressure ratio difference 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 excellent cooling effect in the current external environment temperature, for example, in extremely cold environments such as winter, even if the outdoor fan 21 is turned off, the outdoor fan 21 can be turned off; and if the actual pressure ratio difference is greater than the second preset pressure ratio difference, the outdoor fan 21 is turned on.
Illustratively, in step S1031, the current wet bulb temperature may be calculated by combining the current external environment temperature with the relative humidity (checked by table look-up) of the current season of the area, then the saturated condensing temperature of the evaporative condenser 2 is determined according to the sum of the current wet bulb temperature and the approaching 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 taken as the lowest set pressure ratio of the exhaust pressure to the suction pressure of the compressor under the current external environment temperature condition.
As a preferred embodiment of the above control method provided in the present embodiment, as a control method for the outdoor fan 21 that can be used alone or in combination with the above steps S101 to S103, the control method in 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; 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.
Illustratively, in step S201, the current water temperature of the water storage tank 24 may be obtained by the second temperature sensor 26. In step S202, the current wet bulb temperature may be calculated by combining the current external environment temperature with the current seasonal relative humidity (checked by table look-up) of the area, and the wet bulb temperature is the lowest set water temperature of the water tank 24 under the current external environment 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 the present 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 the second preset pressure ratio difference; 2) The outdoor fan 21 is turned on when the actual temperature difference is greater than the second preset temperature difference.
Therefore, the opening and closing of the outdoor fan 21 are controlled 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 better energy-saving effect when the evaporative condenser unit is ensured to normally operate.
It can be understood that in the control method of the evaporative condenser unit provided in this embodiment, the energy-saving control is performed on the outdoor fan 21 in combination with 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 available under different external environment temperatures, and the temperature of the outdoor fan 21 is higher than the lowest temperature, otherwise the outdoor fan 21 is always started but the cooling effect is small, so that energy waste is caused. The operation of the evaporative condenser assembly can be made more reliable if the determination of the opening and closing of the outdoor fan 21 is made in combination 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, 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 normal operation of the evaporative condenser unit, the outdoor fan 21 is closed to save energy; and the outdoor fan 21 is turned on as needed to enable the evaporative condenser set to operate normally. Therefore, the normal operation of the suspension evaporation direct expansion unit is ensured, and the problem of energy waste can be avoided.
As a preferred implementation manner of the 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 to return water to the water storage tank 24 after the sprayed water cools the heat exchange coil, where the control method in this embodiment further includes: and S3, controlling the water pump 23 based on the current exhaust pressure, the current pressure ratio and the current external environment temperature.
As a preferred implementation of the above control method provided in the present embodiment, in step S3, in the case where 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 will be appreciated that the combination of the first preset exhaust pressure threshold, the first preset pressure ratio threshold, and the second preset exhaust pressure threshold as the basis for determining that the water pump 23 is on may enable the evaporative condenser unit to operate more reliably and with less energy.
As a preferred implementation of the above control method provided by the present embodiment, in step S3, in the case where 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 is less than a second preset pressure ratio threshold that is less than the first preset pressure ratio threshold.
It will be appreciated that the combination of the first preset pressure ratio threshold, the third exhaust pressure threshold, and the second preset pressure ratio threshold as a basis for determining that the water pump 23 is off may enable more reliable and energy-efficient operation of the evaporative condenser unit.
As a preferred implementation manner of the control method provided in this embodiment, the first preset exhaust pressure threshold value, the second preset exhaust pressure threshold value, and the third preset exhaust pressure threshold value are respectively determined 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 value, the second preset exhaust pressure threshold value, and the third preset exhaust pressure threshold value; 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 positively correlated with the current external environment temperature. The second mapping relationship can be expressed in the form of a table or a function.
As a preferred implementation of the control method provided in this embodiment, in step S3, the rotation speed of the water pump 23 may also be 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 ambient temperature conditions. The second mapping relationship can 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 the preset values, the fact that the cooling by the outdoor fan 21 cannot meet the normal operation requirement of the evaporative condenser unit is indicated, at the moment, the water pump 23 can be started and the heat exchange coil is cooled by spraying by the spraying device, so that the normal operation of the evaporative condenser unit is ensured.
Of course, the alternative embodiments described above, as well as the alternative and preferred embodiments, may also be used in a cross-fit manner, thereby combining new embodiments to suit more specific application scenarios.
It should be noted that, although the detailed steps of the method of the present invention are described above in detail, those skilled in the art may combine, split and exchange the sequence of the steps without departing from the basic principle of the present invention, and the technical solution modified in this way does not change the basic concept of the present invention, and therefore falls within the scope of protection 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, etc.) or a processor (processor) to perform some steps of the methods of the various embodiments of the invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, 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.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will fall within the scope of the present invention.
Claims (8)
1. The control method of the evaporative condenser unit is characterized in that the evaporative condenser unit comprises a heat exchange coil connected to a refrigerant circulation system and an outdoor fan for cooling the heat exchange coil; the evaporative condenser unit further comprises a spraying device for cooling the heat exchange coil, the spraying device is connected with a water storage tank through a water pump, and the spraying device is arranged to enable sprayed water to flow back into the water storage tank after 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 circulation system;
determining a current pressure ratio based on a ratio of the current discharge pressure to the current suction pressure;
determining a lowest set pressure ratio of discharge pressure to suction pressure of the compressor at the current ambient temperature 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;
closing the outdoor fan if the actual pressure ratio difference is smaller than the first preset pressure ratio difference, and opening the outdoor fan if the actual pressure ratio difference is larger than the second preset pressure ratio difference;
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;
and if the actual temperature difference is smaller than the first preset temperature difference, closing the outdoor fan, and if the actual temperature difference is larger than the second preset temperature difference, opening the outdoor fan.
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 relation, the rotation speed of the outdoor fan and the pressure ratio are positively correlated.
3. The control method according to claim 1, characterized in that 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 larger than the second preset temperature difference, starting the outdoor fan.
4. The control method according to claim 1, characterized in that the control method further comprises:
and controlling the water pump based on the current exhaust pressure, the current pressure ratio and the current external environment temperature.
5. The control method according to claim 4, wherein in the step of controlling the water pump based on the current exhaust pressure, the current pressure ratio, and the current external environment temperature, in the case where the current exhaust pressure is greater than a first preset exhaust pressure threshold value, the water pump 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.
6. The control method according to claim 5, wherein in the step of controlling the water pump based on the current exhaust pressure, the current pressure ratio, and the current external environment temperature, in the case where the current exhaust pressure is smaller than a first preset pressure ratio threshold value, 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 preset exhaust pressure threshold, which is less than the first preset exhaust pressure threshold and the second preset exhaust pressure threshold;
2) The current pressure ratio is less than a second preset pressure ratio threshold that is less than the first preset pressure ratio threshold.
7. The control method according to claim 6, characterized in that the first preset exhaust pressure threshold, the second preset exhaust pressure threshold, and the third preset exhaust pressure threshold are 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, respectively;
and in the second mapping relationship, positive correlation is formed among the first preset exhaust pressure threshold, the second preset exhaust pressure threshold, the third preset exhaust pressure threshold and the current external environment temperature.
8. The control method according to claim 4, characterized in that the step of controlling the water pump based on the current exhaust pressure, the current pressure ratio, and the current outside environment temperature includes:
based on the current exhaust pressure and the current pressure ratio, and combining the current exhaust pressure, the current pressure ratio and the water under different pre-established external environment temperature conditions
And controlling the rotation speed of the water pump according to a third mapping relation between the rotation speeds of the pumps.
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| CN104807139A (en) * | 2015-04-24 | 2015-07-29 | 广东美的制冷设备有限公司 | Control method of air conditioner and control device |
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| CN111141041A (en) * | 2020-01-22 | 2020-05-12 | 辽宁沣知稼农业科技发展有限公司 | Wide-working-condition all-year refrigeration type evaporative cooling magnetic suspension refrigerating unit and control method |
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