CN111765598B - Evaporative cooling air conditioner and control method of cooling medium driving pump body thereof - Google Patents
Evaporative cooling air conditioner and control method of cooling medium driving pump body thereof Download PDFInfo
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- CN111765598B CN111765598B CN202010656294.9A CN202010656294A CN111765598B CN 111765598 B CN111765598 B CN 111765598B CN 202010656294 A CN202010656294 A CN 202010656294A CN 111765598 B CN111765598 B CN 111765598B
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/38—Failure diagnosis
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/85—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using variable-flow pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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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
- F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
- F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
- F24F5/0035—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using evaporation
Abstract
The invention discloses an evaporative cooling air conditioner and a control method of a cooling medium driving pump body thereof, wherein the method comprises the following steps: s1, reading the dry bulb temperature Td1 and the relative humidity RH1 of outdoor cold air; s2, calculating an inlet air wet bulb temperature TW1 and a moisture content d1 based on the dry bulb temperature Td1 and the relative humidity RH 1; s3, calculating a theoretical optimal moisture content d2 according to the inlet air wet bulb temperature TW1 and the optimal relative humidity RH; s4, calculating the quantity mw of the cooling medium required to be sprayed according to the moisture content d1, the theoretical optimal moisture content d2 and the outdoor fan rotating speed fn; s5, converting spraying pressure P1 required by spraying according to the cooling medium mass mw; and S6, adjusting the operating frequency of the cooling medium driving pump body according to the spraying pressure P1 until the pressure in the cooling medium conveying pipeline in the evaporative cooling air conditioner reaches the required spraying pressure P1. The invention can control the spraying amount of the cooling medium according to the outdoor cold air parameters, improve the spraying efficiency, reduce the waste of cooling medium resources and reduce the electric energy consumption.
Description
Technical Field
The invention relates to the field of air conditioners, in particular to an evaporative cooling air conditioner and a control method of a cooling medium driving pump body thereof.
Background
Current indirect evaporative cooling air conditioner is through detecting outdoor dry bulb temperature or wet bulb temperature, judge whether get into wet operating mode, if get into wet operating mode, then open spray pump, carry water in the water tank to spraying system, spraying system evenly distributes water on indirect heat transfer core, and water evaporation is with outdoor cold air cooling, outdoor cold air after the cooling carries out the heat transfer through indirect heat transfer core and indoor hot-air again, thereby make indoor hot-air temperature decline.
When the existing indirect evaporative cooling air conditioner needs to be started for spraying, the control is only realized by starting the water pump, the spraying water quantity cannot be adjusted, in the control mode, when the ambient air humidity is high and the outdoor air quantity is small, the spraying water quantity required by treating outdoor cold air is small, the treatment is still carried out with a certain fixed water quantity at the moment, the water pump can do unnecessary work, the electric energy is wasted, the redundant spraying water mist can be taken away by outdoor air, the waste of water resources is caused, on the other hand, the redundant spraying water can also cause the resistance of an outer side fan to be increased, the labor consumption of the fan is increased, and the unit energy efficiency is smaller.
Disclosure of Invention
The invention aims to optimize the control of the cooling medium driving pump body in the unit, so that the spraying amount of the cooling medium can be controlled according to outdoor cold air parameters, the spraying efficiency is improved, the waste of cooling medium resources is reduced, and the electric energy consumption is reduced.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the cooling medium driving pump body control method of the evaporative cooling air conditioner comprises the following steps:
s1, reading the dry bulb temperature Td1 and the relative humidity RH1 of outdoor cold air;
s2, calculating an inlet air wet bulb temperature TW1 and a moisture content d1 based on the dry bulb temperature Td1 and the relative humidity RH 1;
s3, calculating a theoretical optimal moisture content d2 according to the inlet air wet bulb temperature TW1 and the set optimal relative humidity RH;
s4, calculating the amount mw of the cooling medium sprayed by the air conditioner to achieve evaporative cooling according to the moisture content d1, the theoretical optimal moisture content d2 and the rotating speed fn of the fan used for extracting outdoor cold air at the outdoor side;
s5, converting spraying pressure P1 required by spraying according to the cooling medium mass mw required by spraying;
and S6, adjusting the operating frequency of the cooling medium driving pump body according to the spraying pressure P1 until the pressure in the cooling medium conveying pipeline in the evaporative cooling air conditioner reaches the required spraying pressure P1.
Further, in step S3, the theoretical optimum moisture content d2 is converted from the intake wet bulb temperature TW1 instead of the optimum outdoor dry bulb temperature Td 2.
Further, the cooling medium mass mw required for the spraying is specifically mw — k1 (d2-d1) × fn, where k1 is a predetermined coefficient.
Further, the spraying pressure P1 is P1 ═ k2 × mw + Pmin, where k2 is a preset coefficient and Pmin is the minimum pressure required for normal start of spraying.
Further, the steps S1 to S6 are periodically performed.
Further, the method also comprises the following fault detection steps: and after the cooling medium driving pump body is started for a certain time, if the flow of the cooling medium in the cooling medium conveying pipeline is detected to be less than the set minimum flow, a warning is sent out and the cooling medium driving pump body is stopped.
Further, in the fault detection step, the detection is periodically executed, and if the flow rate of the cooling medium in the cooling medium transportation pipeline is detected to be larger than the set minimum flow rate, the operation of the cooling medium driving pump body is recovered.
Further, if the flow of the cooling medium in the cooling medium conveying pipeline is detected to be smaller than the set minimum flow for the continuously set times, the locking is failed, and the cooling medium driving pump body is controlled not to restart.
The evaporative cooling air conditioner comprises an outdoor side fan, an evaporative cooling device, a cooling medium storage box, an indirect heat exchange core, a cooling medium driving pump body and a controller, wherein the indirect heat exchange core is provided with an outdoor side air channel for conveying outdoor cold air and an indoor side air channel for conveying indoor hot air, the outdoor side fan is used for pumping the outdoor cold air out of the air conditioner, the cooling medium driving pump body acquires the cooling medium from the cooling medium storage box and conveys the cooling medium to the evaporative cooling device for spraying the indirect heat exchange core,
the cooling medium driving pump body is a variable frequency pump, and further comprises a temperature and humidity sensor positioned on the outdoor cold air inlet side of the indirect heat exchange core body and a pressure sensor arranged on a cooling medium conveying pipeline, wherein the cooling medium driving pump body, the outdoor fan, the temperature and humidity sensor and the pressure sensor are respectively and electrically connected with the controller;
also included is a memory arranged to store computer executable instructions which, when executed, cause the controller to implement the method as described above.
Further, the cooling medium conveying pipeline comprises a flow switch installed on the cooling medium conveying pipeline, and the flow switch is electrically connected with the controller.
According to the invention, the optimal spraying amount of the cooling medium is calculated through the temperature and humidity of outdoor cold air and the air speed of the outer fan, and is converted into the required spraying pressure, so that the operating frequency of the pump body driven by the cooling medium is controlled, the pressure in the cooling medium conveying pipeline reaches the calculated optimal spraying pressure, the spraying pressure is ensured, the spraying amount of the cooling medium can be ensured to be always at the optimal value, the problems of power consumption waste of the pump body, cooling medium resource waste, power consumption increase of the outer fan and the like caused by excessive spraying are avoided, the problems of low evaporation cooling efficiency of the outer air and the like caused by too small spraying amount are also avoided, and the operating efficiency of the unit is improved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like elements throughout the drawings. In the drawings:
fig. 1 shows a schematic view of the structure of an indirect evaporative cooling air conditioner of the present invention;
FIG. 2 illustrates a flow chart of a variable frequency water pump control method of the present invention;
FIG. 3 is a schematic structural diagram of an electronic device according to the present invention;
fig. 4 is a schematic structural diagram of a computer-readable storage medium according to the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The indirect evaporative cooling air conditioner of the present embodiment is shown in fig. 1, and includes an outdoor fan 1, a water spraying device 2, an indirect heat exchange core 3, a water tank 4, a temperature and humidity sensor 5, a water flow switch 6, a water pressure sensor 7, a variable frequency water pump 8, a Y-shaped filter 9, a water baffle 10, and a controller not shown in the figure.
The indirect heat exchange core body 3 is arranged in the middle of the air conditioner and is provided with an outdoor crosswind channel for conveying outdoor cold air and an indoor crosswind channel for conveying indoor hot air, and the outdoor cold air and the indoor hot air exchange heat in the indirect heat exchange core body 3.
The water tank 4 is a cooling medium storage tank and is positioned right below the indirect heat exchange core body 3, the water spraying device 2 is an evaporation cooling device and consists of a spraying rod and a spray head connected to the spraying rod, the spray head is positioned right above the indirect heat exchange core body 3, spray water cools and cools the outdoor cold air from top to bottom under the action of gravity, the heat exchange effect in the indirect heat exchange core body 3 is enhanced, the unevaporated spray water flows downwards and returns to the water tank, the water resource recycling is realized, in addition, because the spraying pipeline and the spray head are higher than the water tank, when the spraying is closed, the water in the spraying pipeline naturally flows back to the water tank by gravity and cannot be stored in the spray head, the water in the pipeline is prevented from freezing, and because the spray head is positioned on the outdoor cold air outlet side of the indirect heat exchange core body 3, the outdoor cold air is heated by heat exchange before flowing through the spray head, the problem that the water in the spray head is frozen due to the fact that the temperature of the spray head is too low can be further avoided.
The variable frequency water pump 8, i.e. the cooling medium drive pump body, takes water from the water tank 4 through a water pipe, i.e. a cooling medium transport pipeline, and delivers the water to the water spray device 2 for spraying. The Y-shaped filter 9 is arranged on a water pipe between the variable frequency water pump 8 and the water tank 4 and used for filtering sundries in a water body and protecting the post-stage equipment from being blocked and damaged.
The outdoor fan 1 is located on the outdoor cold air outlet side of the indirect heat exchange core 3 and behind the spray head, and is used for pumping out outdoor cold air and pushing the outdoor cold air to the outside of the air conditioner for discharging.
The water flow switch 6, namely a flow switch, and the water pressure sensor 7, namely a pressure sensor, are respectively installed on a water pipe between the variable-frequency water pump 8 and the water spraying device 2, the temperature and humidity sensor 5 is located at the outdoor cold air inlet side of the indirect heat exchange core body 3, and the temperature and humidity sensor 5, the water flow switch 6, the water pressure sensor 7 and the variable-frequency water pump 8 are respectively electrically connected with the controller to run in a controlled manner.
The water baffle 10 is positioned between the spray head and the fan and used for preventing a large amount of water vapor from directly passing through a motor of the fan in the escape process to corrode electronic components of the fan, so that the service life of the unit is longer.
During the use, water pump 8 in with water tank 4 is pumped to water spray set 2, and water spray set 2 evenly sprays water to indirect heat transfer core 3 on the surface, and the water evaporation heat absorption that distributes on the heat exchanger surface cools outdoor cold air, and the heat transfer is carried out with indoor hot-air to outdoor cold air after the cooling, and the water that has not evaporated falls to water tank 4 by gravity in, and the partial water smoke that is produced by water spray set 2 simultaneously brings into the external environment along with outdoor cold air.
Based on the indirect evaporative cooling air conditioner, as shown in fig. 2, the following variable frequency water pump control method can be operated:
s1, a controller obtains a dry bulb temperature Td1 and a relative humidity RH1 of outdoor cold air by reading electric signals sent by a temperature and humidity sensor 5;
s2, calculating the inlet air wet bulb temperature TW1 and the moisture content d1 based on the dry bulb temperature Td1 and the relative humidity RH1,
specifically, according to the journal "warm ventilation and air conditioning" journal of 2004, volume 34, 10, a method for calculating the relative humidity of humid air "(author: yao-bright, liang-wei, and zhi-zi), the moisture content d1 has the formula (1):
d1＝RH1*(0.622*Exp(23.1964-3816.44/(227+Td1)))/(101325-Exp(23.1964-3816.44/(227+Td1))；
and the moisture content d1 has the formula (2) of
d1＝1000*{167.52*(374-Tw1)0.38+[(Td1-Tw1)*exp(23.1964-3816.44/(227+Tw1)]-{101325*(Td1-Tw1)}/{[1.88*(Td1-Tw1)+267.38*(374-Tw1)0.38]*[101375-exp(23.1964-3816.44/(227+Td1)]}；
In the above two formulas, 101375 is the standard atmospheric pressure, the other values are fitting values,
the inlet air wet bulb temperature TW1 and the moisture content d1 are solved by substituting the dry bulb temperature Td1 and the relative humidity RH1 and simultaneously solving two calculation formulas. The calculation methods of the two moisture contents are formulas in the prior literature and are calculated by approximate engineering.
S3, calculating a theoretical optimal moisture content d2 according to the inlet air wet bulb temperature TW1 and the optimal relative humidity RH of the air outlet side after spraying and humidifying;
specifically, empirically, the optimal relative humidity RH on the air outlet side after humidification by spraying is set to 95%, and since the theoretically optimal outdoor air outlet dry bulb temperature Td2 is equal to the inlet wet bulb temperature TW1, the optimal outdoor air outlet dry bulb temperature Td2 is directly replaced by the inlet wet bulb temperature TW1, and the operation of the formula (1) is performed, so that the theoretically optimal moisture content d2 is as follows:
d2＝RH*(0.622*Exp(23.1964-3816.44/(227+TW1)))/(101325-Exp(23.1964-3816.44/(227+TW1))。
s4, reading the rotating speed fn of the outdoor fan 1, and calculating the water amount m required by spraying according to the moisture content d1, the theoretical optimal moisture content d2 and the rotating speed fnwK1 (d2-d1) fn, where k1 is a predetermined coefficient, can be obtained by experimental tests.
S5, calculating the spraying pressure P1 ═ k2 × m needed by sprayingw+ Pmin, where k2 is a preset coefficient and Pmin is the most needed spray for normal start-upThe small pressures, k2 and Pmin, can be obtained by experimental tests.
And S6, controlling the variable frequency water pump 8 to be started to operate at the initial frequency N for 10s, and then adjusting the operating frequency of the variable frequency water pump 8 according to the calculated spraying pressure P1 required by operation until the water pressure collected by the water pressure sensor 7 reaches the required spraying pressure P1.
S7, recalculating the required spraying pressure P1 every 30S, and adjusting the running frequency of the variable-frequency water pump 8 in real time according to the calculated spraying pressure P1;
s8, after the variable frequency water pump 8 is started for 30s, detecting whether water flow is normal through a water flow switch 6 preset on a water pipe, if the water flow switch 6 is detected to be closed (if the water flow on a water channel is larger than a set minimum flow, the water flow is closed and conducted, and if the water flow is smaller than the set minimum flow, the water flow switch is automatically opened and closed), determining that the water flow is normal to operate, if the water flow switch 6 is detected to be opened, determining that the water system is abnormal, reporting that the water system is abnormal to a unit, immediately stopping the variable frequency water pump 8, restarting the variable frequency water pump 8 after 60s, detecting again, if the water flow switch 6 is detected to be closed, eliminating faults, if the water flow switch 6 is detected to be opened, stopping the variable frequency water pump 8 again, starting the variable frequency water pump 8 for the third time after 60s, detecting again after the third time, and during detection, if the water flow switch 6 is detected to be closed, eliminating faults, and the variable frequency water pump 8 normally runs, if the water flow switch 6 is detected to be disconnected, the fault is locked, and the variable frequency water pump 8 is not restarted any more. Through the multiple start of frequency conversion water pump 8, detect the state of rivers switch 6 and confirm that the trouble exists, avoid the unit misjudgement.
The frequency conversion water pump control method of the embodiment has the following advantages:
1. the required optimal spraying water quantity is calculated through the temperature and humidity of outdoor cold air and the air speed of an outer side fan, the required optimal spraying water quantity is converted into the required spraying pressure, the operation frequency of the variable frequency water pump is further controlled, the water pressure reaches the calculated optimal spraying pressure, the spraying pressure can be ensured, the water spraying quantity can be ensured to be always in an optimal value, the problems of power consumption waste of the water pump, water resource waste, power consumption increase of the outer side fan and the like caused by excessive spraying are avoided, the problems of low outer side air evaporation cooling efficiency and the like caused by too small spraying water quantity can be avoided, and the operation efficiency of the unit is improved;
2. through predetermineeing the flow switch on the water route, the solution is dirty stifled because of the water route, the water pump operation that causes because of the scheduling problem leaks is unusual to be damaged, specifically speaking, because the water system probably is because foreign matter or leak, cause the dirty stifled and rivers of water route unusual, thereby probably lead to the water pump idle running and cause the water pump to damage, for solving this problem, this embodiment has set up flow switch on the water pipe water route of water system, this flow switch can reach the minimum flow that sets for through detecting water epaxial discharge and judge whether unusual water system, if the flow switch disconnection, then the water pump is closed at once, if the flow switch closure, then the water pump normal operating, and then avoided the water pump that the water pump idle running caused damage or rivers unusual and lead to the invalid problem such as acting of water pump.
It should be noted that:
the method used in the embodiment is not limited to be applied to an indirect evaporative cooling unit, but can also be applied to a direct evaporative cooling unit, such as an open cooling tower;
the indirect cooling mode is not limited to water spray cooling, and can also be other spraying modes such as spray cooling and the like, of course, when the water spray cooling is used, the spray head is placed above the heat exchange core body, so that the spray water can flow down, and the spray head and outdoor air can perform countercurrent heat exchange in the flowing down process, but the spray cooling cannot achieve good cooling effect because fog drops are too small and can be easily taken away by wind, so when the spray cooling is used, the spray head needs to be placed below or around the lower part of the heat exchange core body, and the water spray cooling mode is generally preferred;
the cooling medium is not limited to water, and may be other cooling media such as glycol solution.
The method of the present embodiment may be implemented by a method that is converted into program steps and apparatuses that can be stored in a computer storage medium and invoked and executed by a controller.
The algorithms and displays presented herein are not inherently related to any particular computer, virtual machine, or other apparatus. Various general purpose devices may be used with the teachings herein. The required structure for constructing such a device will be apparent from the description above. Moreover, the present invention is not directed to any particular programming language. It is appreciated that a variety of programming languages may be used to implement the teachings of the present invention as described herein, and any descriptions of specific languages are provided above to disclose the best mode of the invention.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
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 following claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
For example, fig. 3 shows a schematic structural diagram of an electronic device according to an embodiment of the invention. The electronic device conventionally comprises a processor 31 and a memory 32 arranged to store computer-executable instructions (program code). The memory 32 may be an electronic memory such as a flash memory, an EEPROM (electrically erasable programmable read only memory), an EPROM, a hard disk, or a ROM. The memory 32 has a storage space 33 storing program code 34 for performing any of the method steps in the embodiments. For example, the storage space 33 for the program code may comprise respective program codes 34 for implementing respective steps in the above method. The program code can be read from or written to one or more computer program products. These computer program products comprise a program code carrier such as a hard disk, a Compact Disc (CD), a memory card or a floppy disk. Such a computer program product is typically a computer readable storage medium such as described in fig. 4. The computer readable storage medium may have memory segments, memory spaces, etc. arranged similarly to the memory 32 in the electronic device of fig. 3. The program code may be compressed, for example, in a suitable form. In general, the memory unit stores program code 41 for performing the steps of the method according to the invention, i.e. program code readable by a processor such as 31, which when run by an electronic device causes the electronic device to perform the individual steps of the method described above.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (7)
1. A control method for a cooling medium driving pump body of an evaporative cooling air conditioner is characterized by comprising the following steps:
s1, reading the dry bulb temperature Td1 and the relative humidity RH1 of outdoor cold air;
s2, calculating an inlet air wet bulb temperature TW1 and a moisture content d1 based on the dry bulb temperature Td1 and the relative humidity RH 1;
s3, calculating a theoretical optimal moisture content d2 according to the air inlet wet bulb temperature TW1 and the set optimal relative humidity RH, wherein the air inlet wet bulb temperature TW1 replaces the optimal outdoor air outlet dry bulb temperature Td 2;
s4, calculating the amount m of the sprayed cooling medium required by the air conditioner to achieve evaporative cooling according to the moisture content d1, the theoretical optimal moisture content d2 and the rotating speed fn of the fan used for extracting outdoor cold air at the outdoor sidewThe amount m of cooling medium required for sprayingwIn particular mw= k 1= (d2-d1) × fn, in which k1 is a preset coefficient;
s5, according to the cooling medium mass m required by sprayingwConverting a spraying pressure P1 required for spraying, wherein the spraying pressure P1 is P1= k2 mw+ Pmin, wherein k2 is a preset coefficient, and Pmin is the minimum pressure required by normal starting of spraying;
and S6, adjusting the cooling medium to drive the pump body to operate at the initial frequency N for a period of time according to the spraying pressure P1, and then adjusting the operating frequency of the cooling medium to drive the pump body until the pressure in the cooling medium conveying pipeline in the evaporative cooling air conditioner reaches the required spraying pressure P1.
2. The cooling medium-driven pump body control method according to claim 1, wherein the periodic execution of the pump body is performedStep by stepStep S1 to step S6.
3. The cooling medium driven pump body control method according to claim 1, further comprising a failure detection step of: and after the cooling medium driving pump body is started for a certain time, if the flow of the cooling medium in the cooling medium conveying pipeline is detected to be less than the set minimum flow, a warning is sent out and the cooling medium driving pump body is stopped.
4. The cooling medium-driven pump body control method according to claim 3, wherein in the failure detection step, the detection is performed periodically, and the cooling medium-driven pump body is resumed if it is detected that the flow rate of the cooling medium in the cooling medium transport pipe is greater than a set minimum flow rate.
5. The method according to claim 4, wherein if the flow rate of the cooling medium in the cooling medium transportation pipeline is detected to be less than a set minimum flow rate for a predetermined number of consecutive times, the lock is failed and the cooling medium driven pump body is controlled not to restart.
6. Evaporative cooling air conditioner, including outdoor side fan, evaporative cooling device, coolant storage box, indirect heat transfer core, the coolant drive pump body, controller, indirect heat transfer core has the outdoor side wind passageway that is used for carrying outdoor cold air to and be used for carrying the indoor side wind passageway of indoor hot-air, outdoor side fan is used for taking outdoor cold air out to the air conditioner outside, the coolant drive pump body acquires from the coolant storage box that coolant transports to evaporative cooling device and carries out the sprinkling to indirect heat transfer core, its characterized in that:
the cooling medium driving pump body is a variable frequency pump, and further comprises a temperature and humidity sensor positioned on the outdoor cold air inlet side of the indirect heat exchange core body and a pressure sensor arranged on a cooling medium conveying pipeline, wherein the cooling medium driving pump body, the outdoor fan, the temperature and humidity sensor and the pressure sensor are respectively and electrically connected with the controller;
further comprising a memory arranged to store computer executable instructions that when executed cause the controller to implement the method of any one of claims 1-5.
7. An evaporative cooling air conditioner as set forth in claim 6, wherein: the cooling medium conveying pipeline is provided with a flow switch, and the flow switch is electrically connected with the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010656294.9A CN111765598B (en) | 2020-07-09 | 2020-07-09 | Evaporative cooling air conditioner and control method of cooling medium driving pump body thereof |
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