CN112378057B - Evaporative cooling unit control method and device and air conditioning equipment - Google Patents

Evaporative cooling unit control method and device and air conditioning equipment Download PDF

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Publication number
CN112378057B
CN112378057B CN202011323470.3A CN202011323470A CN112378057B CN 112378057 B CN112378057 B CN 112378057B CN 202011323470 A CN202011323470 A CN 202011323470A CN 112378057 B CN112378057 B CN 112378057B
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China
Prior art keywords
temperature difference
inlet
frequency
water mist
outlet temperature
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CN202011323470.3A
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CN112378057A (en
Inventor
卓明胜
李阳
刘洋
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/83—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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
    • F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Abstract

The invention discloses an evaporative cooling unit control method and device and air conditioning equipment. Wherein the method comprises the following steps: detecting inlet and outlet temperature difference delta T of an evaporative cooling unit; when the inlet and outlet temperature difference DeltaT is not in the preset temperature difference range, adjusting the frequency of a fan and/or the frequency of a water pump so that the inlet and outlet temperature difference DeltaT is in the preset temperature difference range; and when the inlet and outlet temperature difference DeltaT is within a preset temperature difference range, the current fan frequency and the current water pump frequency are maintained. The invention can prevent the heat exchange coil from forming dry spots, save water consumption in the refrigerating process, prevent the spray nozzle from being blocked and not refrigerating, and increase the applicability of the evaporative cooling unit in different areas.

Description

Evaporative cooling unit control method and device and air conditioning equipment
Technical Field
The invention relates to the field of unit control, in particular to an evaporative cooling unit control method and device and air conditioning equipment.
Background
The evaporative cooling air conditioning technology is a technology for utilizing water evaporation to absorb heat for refrigeration. In the absence of another heat source, the heat and humidity exchange process between water and air is that the air transfers sensible heat to the water, so that the temperature of the air is reduced. The moisture content of the air is not only increased due to the evaporation of water, but also the water vapor entering the air brings back some latent heat of vaporization. As long as the air is not saturated, the circulating water is utilized to directly spray the air (or through the filler layer), so that the cooling effect can be obtained. When conditions allow, the cooled air can be used as a supply air to lower the room temperature, and the method for processing the air is called evaporative cooling air conditioner.
Evaporative cooling units are increasingly in demand due to their great potential in terms of energy efficiency. But the cooling effect of the evaporative cooling units is susceptible to regional environmental factors.
The unreasonable spray water quantity and air quantity supply of the evaporative cooling unit easily causes dry spots on the coil, and the problem of liquid drop splashing and water drift is easily caused when the spray water quantity is excessive. On this basis, the nozzle of the traditional ejector is easy to block.
Aiming at the problems of dry spots formed on a coil pipe in an evaporative cooling unit and the problems of liquid drop splashing and water drifting caused by excessive spray water in the prior art, an effective solution is not proposed at present.
Disclosure of Invention
The embodiment of the invention provides a control method and a control device for an evaporative cooling unit, which are used for solving the problems of dry spots formed on a coil pipe in the evaporative cooling unit and the problems of liquid drop splashing and water drifting caused by excessive spray water in the prior art.
In order to solve the technical problems, the invention provides a control method of an evaporative cooling unit, wherein the method comprises the following steps:
detecting inlet and outlet temperature difference delta T of an evaporative cooling unit;
when the inlet and outlet temperature difference DeltaT is not in the preset temperature difference range, adjusting the frequency of a fan and/or the frequency of a water pump so that the inlet and outlet temperature difference DeltaT is in the preset temperature difference range;
and when the inlet and outlet temperature difference DeltaT is not in the preset temperature difference range, the current fan frequency and the current water pump frequency are maintained.
Alternatively to this, the method may comprise,
when the inlet-outlet temperature difference DeltaT is within the preset temperature difference range, the method further comprises the following steps: detecting the water mist droplet size D;
when the water mist droplet size D is not in the preset droplet diameter range, adjusting the frequency of the air compressor so that the water mist droplet size D is in the preset droplet diameter range;
when the water mist droplet size D is within the preset droplet diameter range, detecting the inlet and outlet temperature difference delta T of the evaporative cooling unit again;
and when the inlet and outlet temperature difference DeltaT is within the preset temperature difference range, the current fan frequency and the current water pump frequency are maintained.
Optionally, the detecting the inlet and outlet temperature difference Δt of the evaporative cooling unit includes:
when the evaporative cooling unit works, the temperature at the inlet and the temperature at the outlet are detected by an inlet temperature sensor and an outlet temperature sensor respectively, and the inlet-outlet temperature difference DeltaT is calculated according to the temperature at the inlet and the temperature at the outlet.
Optionally, when the inlet and outlet temperature difference Δt is not within a preset temperature difference range, adjusting a fan frequency and/or a water pump frequency so that the inlet and outlet temperature difference Δt is within the preset temperature difference range, including:
if the inlet and outlet temperature difference is smaller than the minimum temperature difference A, gradually increasing the fan frequency according to P=P01+t1, gradually increasing the water pump frequency according to M=M0+tK, and detecting the inlet and outlet temperature difference DeltaT in real time until the inlet and outlet temperature difference reaches the minimum temperature difference A;
if the inlet and outlet temperature difference is larger than the maximum temperature difference B, gradually reducing the frequency of the fan according to P=P01-tN 1, gradually reducing the frequency of the water pump according to M=M0-tK, and detecting the inlet and outlet temperature difference DeltaT in real time until the inlet and outlet temperature difference is reduced to the maximum temperature difference B;
wherein, P01 fan initial frequency, t is iteration number, N1 is fan frequency increment, P represents the frequency of the fan in the iteration process, M0 is water pump initial frequency, K is fan frequency increment, and M represents the frequency of the water pump in the iteration process.
Optionally, the detecting the water mist droplet size D includes:
and shooting water mist droplet image information by a shooting unit, and calculating the average value of the particle sizes of the water mist droplets according to the droplet image information to obtain the water mist droplet size D.
Optionally, when the water mist droplet size D is not within a preset droplet diameter range, adjusting the frequency of the air compressor so that the water mist droplet size D is within the preset droplet diameter range, including:
if the water mist droplet size D is smaller than the minimum set value E, gradually reducing the frequency of the air compressor according to P' =P02-tN 2, and detecting the water mist droplet size D in real time until the water mist droplet size D reaches the minimum set value E;
if the water mist droplet size D is larger than the maximum set value F, gradually increasing the frequency of the air compressor according to P' =P02+tN2, and detecting the water mist droplet size D in real time until the water mist droplet size D is reduced to the maximum set value F;
wherein P02 is the initial frequency of the air compressor, t is the iteration number, N2 is the frequency increment of the air compressor, and P' represents the frequency of the air compressor in the iteration process.
Optionally, the capturing the image information of the water mist droplets by the capturing unit includes:
the water mist is illuminated by emitting laser light through a pulse laser;
while capturing image information of the illuminated area through a camera lens.
In another aspect, the present invention provides a control device for an evaporative cooling unit, the control device comprising:
the signal receiving processor is respectively connected with the air inlet temperature sensor and the air outlet temperature sensor;
the air inlet temperature sensor is arranged at the air inlet of the unit, the air outlet temperature sensor is arranged at the air outlet of the unit, and the air inlet temperature sensor and the air outlet temperature sensor are respectively used for detecting the temperatures of the air inlet and the air outlet of the unit and transmitting the two temperatures to the signal receiving processor;
the signal receiving processor is used for calculating the inlet and outlet temperature difference delta T of the evaporative cooling unit according to the two temperatures;
when the inlet and outlet temperature difference DeltaT is within a preset temperature difference range, indicating the fan and the water pump to respectively maintain the current fan frequency and the current water pump frequency;
alternatively to this, the method may comprise,
the signal receiving processor is also connected with the air compressor and the shooting unit;
the shooting unit is used for shooting spray liquid drop image information and sending the spray liquid drop image information to the signal receiving processor;
the signal receiving processor is further used for indicating the fan to adjust the fan frequency and/or indicating the water pump to adjust the water pump frequency when the inlet and outlet temperature difference delta T is not in a preset temperature difference range, so that the inlet and outlet temperature difference delta T is in the preset temperature difference range;
when the inlet and outlet temperature difference DeltaT is within the preset temperature difference range, the shooting unit is instructed to shoot water mist droplet image information, and the water mist droplet size D is calculated according to the water mist droplet image information;
and the air compressor is used for indicating the air compressor to adjust the frequency of the air compressor when the water mist droplet size D is not in the preset droplet diameter range so that the water mist droplet size D is in the preset droplet diameter range;
and the device is used for detecting the inlet and outlet temperature difference delta T of the evaporative cooling unit again when the water mist droplet size D is within the preset droplet diameter range.
Optionally, the unit includes:
a gas diverter, a liquid diverter, and a gas-liquid mixing nozzle;
the gas-liquid mixing nozzle is respectively connected with the gas diverter and the liquid diverter, the gas diverter is connected with the air compressor, and the liquid diverter is connected with the water pump.
Optionally, the shooting unit includes:
the camera lens is connected with the signal receiving processor and is used for shooting the image information of the water mist liquid drops;
the synchronous controller, the pulse laser, the light guide arm and the light source port are sequentially connected and are used for providing illumination when the camera lens shoots; the synchronous controller is connected with the signal receiving processor and used for precisely controlling the time synchronization of illumination and shooting.
In addition, the invention provides air conditioning equipment, a control device comprising the evaporative cooling unit, and the evaporative cooling unit.
The invention also provides a computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor implements a method as described above.
The invention has the beneficial effects that: according to the invention, by innovatively adopting the gas-liquid mixing nozzle, the pulse laser, the camera lens and the synchronous controller, the time synchronization of illumination and shooting is accurately controlled, and simultaneously, the frequency of the water pump and the frequency of the fan are accurately adjusted by adopting the signal receiving processor, so that the problems of dry spots formed on a coil pipe in an evaporative cooling unit and the problems of liquid drop splashing and water drifting caused by excessive spray water in the prior art are solved. Therefore, the coil can be prevented from forming dry spots, the water consumption in the refrigerating process is saved, the phenomenon that the spray nozzle is blocked and cannot refrigerate is further prevented, and the applicability of the evaporative cooling unit in different areas is improved.
Drawings
FIG. 1 is a flow chart of a method of evaporative cooling unit control according to an embodiment of the present invention;
FIG. 2 is a flow chart of another alternative implementation of an evaporative cooling unit control method in accordance with an embodiment of the present invention;
fig. 3 is a structural view of a control device of an evaporative cooling unit according to an embodiment of the present invention;
fig. 4 is a flowchart of a control method of cooling control by the control device of the evaporative cooling unit of the above embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plurality" generally includes at least two.
It should be understood that the term "and/or" as used herein is merely one relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be understood that although the terms first, second, third, etc. may be used to describe … … in embodiments of the present invention, these … … should not be limited to these terms. These terms are only used to distinguish … …. For example, the first … … may also be referred to as the second … …, and similarly the second … … may also be referred to as the first … …, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a commodity or device comprising such element.
Example 1
Alternative embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method of controlling an evaporative cooling unit according to an embodiment of the present invention, as shown in FIG. 1, the method comprising:
s101, detecting inlet and outlet temperature difference delta T of an evaporative cooling unit;
s102, when the inlet and outlet temperature difference DeltaT is not in a preset temperature difference range, adjusting the frequency of a fan and/or the frequency of a water pump so that the inlet and outlet temperature difference DeltaT is in the preset temperature difference range;
s103, when the inlet and outlet temperature difference DeltaT is not in the preset temperature difference range, the current fan frequency and the current water pump frequency are maintained.
Fig. 2 is a flowchart of another alternative implementation of an evaporative cooling unit control method according to an embodiment of the present invention, as illustrated, optionally including:
s104, detecting the water mist droplet size D when the inlet and outlet temperature difference DeltaT is within the preset temperature difference range;
s105, when the water mist droplet size D is not in the preset droplet diameter range, adjusting the frequency of an air compressor so that the water mist droplet size D is in the preset droplet diameter range;
s106, detecting the inlet and outlet temperature difference delta T of the evaporative cooling unit again when the water mist droplet size D is within the preset droplet diameter range;
s107, when the inlet and outlet temperature difference DeltaT is within the preset temperature difference range, the current fan frequency and the current water pump frequency are maintained.
Optionally, the detecting the inlet and outlet temperature difference Δt of the evaporative cooling unit includes:
when the evaporative cooling unit works, the temperature at the inlet and the temperature at the outlet are detected by an inlet temperature sensor and an outlet temperature sensor respectively, and the inlet-outlet temperature difference DeltaT is calculated according to the temperature at the inlet and the temperature at the outlet.
After detecting the temperature difference DeltaT, judging whether A is less than or equal to DeltaT and less than or equal to B. Wherein A is a set minimum temperature difference and B is a set maximum temperature difference.
The inlet temperature sensor is arranged next to the fan and can detect the inlet temperature, which is to be noted as the current ambient temperature. The outlet temperature sensor is arranged next to the water tank, and the temperature is more constant and more accurate because of the water dripped after the water mist is cooled. The inlet temperature can reflect the current environment temperature, so the range of the temperature difference delta T is limited, and the real-time adaptation of the evaporative cooling unit to the current environment can be ensured, so that the evaporative cooling unit is not influenced by the regional environment.
Optionally, when the inlet and outlet temperature difference Δt is not within a preset temperature difference range, adjusting a fan frequency and/or a water pump frequency so that the inlet and outlet temperature difference Δt is within the preset temperature difference range, including:
if the inlet and outlet temperature difference is smaller than the minimum temperature difference A, gradually increasing the fan frequency according to P=P01+t1, gradually increasing the water pump frequency according to M=M0+tK, and detecting the inlet and outlet temperature difference DeltaT in real time until the inlet and outlet temperature difference reaches the minimum temperature difference A;
if the inlet and outlet temperature difference is larger than the maximum temperature difference B, gradually reducing the frequency of the fan according to P=P01-tN 1, gradually reducing the frequency of the water pump according to M=M0-tK, and detecting the inlet and outlet temperature difference DeltaT in real time until the inlet and outlet temperature difference is reduced to the maximum temperature difference B;
wherein, P01 fan initial frequency, t is iteration number, N1 is fan frequency increment, P represents the frequency of the fan in the iteration process, M0 is water pump initial frequency, K is fan frequency increment, and M represents the frequency of the water pump in the iteration process.
The same as above, the real-time adjustment can ensure the better adaptation environment of the evaporative cooling unit, and the real-time adjustment of the water spray quantity and the air quantity according to the environment, thereby saving the water consumption in the refrigeration process.
Optionally, the detecting the water mist droplet size D includes:
and shooting water mist droplet image information by a shooting unit, and calculating the average value of the particle sizes of the water mist droplets according to the droplet image information to obtain the water mist droplet size D.
That is, the water mist droplet size D is the average value of the water mist droplet particle diameter in the captured droplet image portion.
Optionally, the capturing the image information of the water mist droplets by the capturing unit includes:
the water mist is illuminated by emitting laser light through a pulse laser;
while capturing image information of the illuminated area through a camera lens.
Optionally, when the water mist droplet size D is not within a preset droplet diameter range, adjusting the frequency of the air compressor so that the water mist droplet size D is within the preset droplet diameter range, including:
if the water mist droplet size D is smaller than the minimum set value E, gradually reducing the frequency of the air compressor according to P' =P02-tN 2, and detecting the water mist droplet size D in real time until the water mist droplet size D reaches the minimum set value E;
if the water mist droplet size D is larger than the maximum set value F, gradually increasing the frequency of the air compressor according to P' =P02+tN2, and detecting the water mist droplet size D in real time until the water mist droplet size D is reduced to the maximum set value F;
wherein P02 is the initial frequency of the air compressor, t is the iteration number, N2 is the frequency increment of the air compressor, and P' represents the frequency of the air compressor in the iteration process.
The camera lens is matched with the pulse laser for use, the camera lens feeds signals back to the signal receiving processor, the signal receiving processor controls the synchronous controller to enable the pulse laser and the camera lens to be synchronous, then the pulse laser emits laser, the laser is emitted from the light source port through the light guide arm to illuminate a region of water mist, the camera lens shoots images of the illuminated water mist region and feeds image information back to the signal receiving processor, and the signal receiving processor further calculates the size D of the water mist liquid drops.
Through the shooting method, the average particle size of the water mist can be accurately measured in real time, the air compressor and the water pump can be adjusted in real time according to the average particle size, the water consumption efficiency in the refrigerating process is improved, and meanwhile, the spray nozzle can be prevented from being blocked due to the fact that the diameter of the sprayed water mist is monitored in real time.
In this embodiment, it is further preferable that the positions of the camera lens and the laser light source opening are set, so as to accurately capture the particle size of the water mist sprayed by each gas-liquid mixing nozzle.
In an alternative embodiment, each nozzle is correspondingly provided with a laser light source port and a camera lens, so that the situation of spraying water mist from one nozzle can be shot each time independently, and the situation of spraying water mist from all the nozzles can be shot each time, and therefore whether the problem of the frequency of the water pump and the air compressor is the problem of the nozzles or not can be judged more accurately. For example, if there is a problem in the particle size of the mist sprayed from only one nozzle, the frequency of the air compressor or the frequency of the water pump should not be adjusted, otherwise, the mist should be adjusted according to the method. Through the preferable mode, the working condition of each nozzle can be detected in real time, and the nozzle can be adjusted in real time according to the working condition, so that the nozzle can be prevented from being blocked more effectively.
Particle size and real-time adjustment through real-time detection water smoke can reduce the influence of ambient humidity to the unit, improves water efficiency.
According to the control method of the evaporative cooling unit, the frequency of the air compressor, the frequency of the water pump and the frequency of the fan can be adjusted in real time by detecting the temperature difference of the inlet and the outlet and the average value of the particle size of sprayed water mist in real time, so that the evaporative cooling unit is better adapted to the environment temperature and humidity and better controls the water consumption, the total amount of air quantity and water consumption is more reasonable, and the problems of coil dry spots, liquid drop splashing and nozzle blockage are avoided.
The present invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements a method as described above.
Example two
Fig. 3 is a structural diagram of a control device of an evaporative cooling unit according to the present invention, and as shown in the drawing, the control device includes:
a signal receiving processor 14, an air inlet temperature sensor 19 and an air outlet temperature sensor 18 which are respectively connected with the signal receiving processor;
the signal receiving processor 14 is also connected with the fan 2 and the water pump 8 of the evaporative cooling unit 1; the air inlet temperature sensor 19 arranged at the air inlet of the unit and the air outlet temperature sensor 18 arranged at the air outlet of the unit are respectively used for detecting the temperatures at the air inlet and the air outlet of the unit and transmitting the two temperatures to the signal receiving processor 14;
as shown in fig. 3, an inlet temperature sensor 19 is arranged next to the fan 2, which can detect the inlet temperature—it should be noted that the inlet temperature is the current ambient temperature. The outlet temperature sensor 18 is provided next to the water tank 6, and the temperature is more constant and accurate because of the water that drips immediately after the mist is cooled. The inlet temperature can reflect the current environment temperature, so the range of the temperature difference delta T is limited, and the real-time adaptation of the evaporative cooling unit to the current environment can be ensured, so that the evaporative cooling unit is not influenced by the regional environment.
The signal receiving processor 14 is used for calculating an inlet and outlet temperature difference delta T of the evaporative cooling unit according to the two temperatures;
when the inlet and outlet temperature difference DeltaT is not in the preset temperature difference range, the fan is instructed to adjust the fan frequency and/or the water pump is instructed to adjust the water pump frequency, so that the inlet and outlet temperature difference DeltaT is in the preset temperature difference range;
and when the inlet and outlet temperature difference DeltaT is within a preset temperature difference range, indicating the fan 2 and the water pump 8 to respectively maintain the current fan frequency and the current water pump frequency.
Preferably, the signal receiving processor 14 is also connected with the air compressor 15 and the shooting unit;
the shooting unit is used for shooting water mist droplet image information and sending the water mist droplet image information to the signal receiving processor 14;
the signal receiving processor 14 is further configured to instruct the shooting unit to shoot water mist droplet image information when the inlet-outlet temperature difference Δt is within the preset temperature difference range, and calculate a water mist droplet size D according to the water mist droplet image information;
and the air compressor is used for indicating the air compressor to adjust the frequency of the air compressor when the water mist droplet size D is not in the preset droplet diameter range so that the water mist droplet size D is in the preset droplet diameter range;
and the device is used for detecting the inlet and outlet temperature difference delta T of the evaporative cooling unit again when the water mist droplet size D is within the preset droplet diameter range.
Because the fan frequency, the water pump frequency and the air compressor frequency are adjusted in real time when the unit works, the spray water quantity and the air quantity supply of the evaporative cooling unit are more reasonable, dry spots cannot be formed on the coil pipe, and the problems of liquid drop splashing, water bleaching and the like caused by excessive spray water quantity are avoided because the spray water quantity is more reasonable.
Optionally, the unit 1 includes:
a gas flow divider 12, a liquid flow divider 13, and a gas-liquid mixing nozzle 17;
the gas-liquid mixing nozzle 17 is respectively connected with the gas diverter 12 and the liquid diverter 13, the gas diverter 12 is connected with the air compressor 15, and the liquid diverter 13 is connected with the water pump 8.
In this embodiment, optionally, ball valves 11 are disposed between the gas diverter 12 and the air compressor 15, and between the liquid diverter 13 and the water pump 8.
Optionally, the shooting unit includes:
a camera lens 16 connected to the signal receiving processor for capturing the image information of the water mist droplets;
the synchronous controller 9, the pulse laser 5, the light guide arm 4 and the light source port 3 are sequentially connected and are used for providing illumination when the camera lens 16 shoots; wherein the synchronization controller 16 is coupled to the signal receiving processor 14 for precisely controlling the time synchronization of illumination and photographing.
Through the structure of shooting, the average particle size of water mist can be accurately measured in real time, and the air compressor 15 and the water pump 8 are adjusted in real time according to the average particle size, so that the spray head 17 can be prevented from being blocked due to the real-time monitoring of the diameter of sprayed water mist while the water consumption efficiency in the refrigerating process is improved.
Further preferably, in this embodiment, the positions of the camera lens 16 and the laser light source port 3 can be set to accurately capture the particle size of the water mist sprayed from each gas-liquid mixing nozzle 17.
In an alternative embodiment, each nozzle is correspondingly provided with a laser light source port and a camera lens, so that the situation of spraying water mist from one nozzle can be shot each time independently, and the situation of spraying water mist from all the nozzles can be shot each time, and therefore whether the problem of the frequency of the water pump and the air compressor is the problem of the nozzles or not can be judged more accurately. For example, if there is a problem in the particle size of the mist sprayed from only one nozzle, the frequency of the air compressor or the frequency of the water pump should not be adjusted, otherwise, the mist should be adjusted according to the method. Through the preferable mode, the working condition of each nozzle can be detected in real time, and the nozzle can be adjusted in real time according to the working condition, so that the nozzle can be prevented from being blocked more effectively.
Particle size and real-time adjustment through real-time detection water smoke can reduce the influence of ambient humidity to the unit, improves water efficiency.
A first flow sensor 101 is disposed between the air compressor 15 and the gas splitter 12, and the first flow sensor 101 is connected to the signal receiving processor 14, and is configured to feed back measured air flow information to the signal receiving processor 14.
A second flow sensor 102 is arranged between the water pump 8 and the liquid diverter 13, and the second flow sensor 102 is connected with the signal receiving processor 14 and is used for feeding back the measured air flow information to the signal receiving processor 14.
The input end of the water pump 8 is connected with the water tank 6 of the unit 1. After being sprayed out, the water mist is cooled by heat exchange of the packing layer 7 and then enters the water tank 6.
The number of the gas diversion branches of the gas diverter 12 and the number of the liquid diversion branches of the liquid diverter 13 are the same as the number of the gas-liquid mixing nozzles 17, and each nozzle 17 corresponds to one liquid branch and one gas branch. As illustrated, this number is preferably 4.
According to the control device of the evaporative cooling unit, the temperature sensor is arranged at the inlet and the outlet respectively to detect the temperature difference of the inlet and the outlet in real time, the shooting unit is arranged to shoot and spray water mist, and the average particle size is calculated, so that the frequency of the air compressor, the frequency of the water pump and the frequency of the fan can be adjusted in real time, the evaporative cooling unit can be better adapted to the environmental temperature and humidity and better control the water consumption, the total amount of air quantity and water consumption is more reasonable, and the problems of coil dry spots, liquid drop splashing and nozzle blockage are avoided.
Fig. 4 is a flowchart of a control method of the refrigeration control by the control device of the evaporative cooling unit of the above embodiment, as illustrated,
the air compressed by the air compressor 15 passes through the ball valve 11 and the first flow sensor 101 in sequence, then enters the gas splitter 12, and the air from the gas splitter 12 is distributed to the gas-liquid mixing nozzle openings 17. After being pumped by the water pump 8, the water in the water tank 6 passes through the ball valve 11 and the flow sensor 10 in sequence, and then enters the liquid diverter 13, and the water from the liquid diverter 13 is distributed to each gas-liquid mixing nozzle opening 17. The air and water at the gas-liquid mixing nozzle 17 are mixed in a predetermined ratio, and then a mist is sprayed from the nozzle. The fan 2 sucks air in the external space into the evaporative cooler, the air exchanges heat with the water mist in the packing layer 7 to be cooled, and then the air leaves the evaporative cooler. The water droplets which are not evaporated fall into the water tank 6 by gravity.
The temperature sensor 19 at the inlet and the temperature sensor 18 at the outlet of the evaporative cooler 1 feed back temperature signals of the air to the signal receiving processor 14, respectively, and the signal receiving processor 14 further judges whether the operating frequencies of the fan 2 and the water pump 8 need to be adjusted according to the received signals. The flow sensor 10 feeds back the measured flow information to the signal receiving processor 14.
The camera lens 16 is matched with the pulse laser 5 for use, the camera lens 16 feeds signals back to the signal receiving processor 14, the signal receiving processor 14 controls the synchronous controller 9 to enable the pulse laser 5 and the camera lens 16 to be synchronous, then the pulse laser 5 emits laser, the laser is emitted from the light source port 3 through the light guide arm 4 to illuminate a region of water mist, the camera lens 16 shoots images of the illuminated water mist region and feeds image information back to the signal receiving processor 14, and the signal receiving processor further calculates the average particle size of water mist liquid drops to judge whether the working frequency of the air compressor 15 needs to be adjusted.
The specific control process is as follows: during operation of the evaporative cooler, the inlet temperature sensor 19 and the outlet temperature sensor 18 feed back measured temperature information to the signal receiving processor 14. The signal receiving processor 14 determines whether the inlet-outlet temperature difference satisfies a+.DELTA.T+.DELTA.B: (1) If the inlet-outlet temperature difference is less than or equal to A and less than or equal to DeltaT and less than or equal to B, maintaining the working frequencies of the original fan and the original water pump, and starting the next step of judgment: whether the average size of the water mist liquid drops meets D-X +.D +.D+X. (2) If the inlet-outlet temperature difference is smaller than A, the signal receiving processor gradually increases the fan frequency according to the mode of P=P01+tN1. Wherein, the initial frequency of the fan P01, t is the iteration times, and N1 is the fan frequency increment. Meanwhile, the signal processor gradually increases the frequency of the water pump according to the mode of M=M0+tK, wherein M0 is the initial frequency of the water pump, t is the iteration number, and K is the fan frequency increment. (3) If the inlet-outlet temperature difference is larger than B, the signal receiving processor gradually reduces the fan frequency according to the mode of P=P01-tN 1. Wherein, the initial frequency of the fan P01, t is the iteration times, and N1 is the fan frequency increment. Meanwhile, the signal processor gradually reduces the frequency of the water pump according to the mode of M=M0-tK, wherein M0 is the initial frequency of the water pump, t is the iteration number, and K is the frequency increment of the fan.
After the signal receiving processor 14 determines that the inlet-outlet temperature difference satisfies a+.ltoreq.Δt+.ltoreq.b, the camera lens transmits captured droplet image information to the signal receiving processor 14, and the signal receiving processor 14 calculates the average droplet size and determines whether the water mist droplets satisfy: E.ltoreq.D.ltoreq.F. (1) If the water mist droplet size is smaller than D-X and smaller than D+X, the air compressor is kept to work as it is. (2) If the water mist droplet size is smaller than D-X, the signal receiving processor 14 gradually decreases the frequency of the air compressor 15 according to the P' =p02—tn2 mode, where P02 is the initial frequency of the air compressor, t is the iteration number, and N2 is the frequency increment of the air compressor. (3) If the water mist droplet size is greater than d+x, the signal receiving processor 14 gradually increases the frequency of the air compressor according to the manner of P '=p02+tn 2, where P' is the initial frequency of the air compressor, t is the iteration number, and N2 is the frequency increment of the air compressor.
After the signal receiving processor 14 determines that the average size of the water mist droplets satisfies D-x+.d+.d+x, it further determines whether the air inlet and outlet temperature difference satisfies a+.Δt+.b, and if not, returns to the previous layer again for iteration. If so, the determination is ended.
The invention adopts the gas-liquid mixing nozzle, the laser auxiliary lighting and the shooting device, the variable-frequency water pump, the variable-frequency fan and the variable-frequency air compressor, can prevent the heat exchange coil from forming dry spots, save water consumption in the refrigerating process, prevent the nozzle from being blocked and not refrigerating, and increase the applicability of the evaporative cooling unit in different areas.
In addition, the invention provides air conditioning equipment, a control device comprising the evaporative cooling unit, and the evaporative cooling unit.
The product can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. Technical details not described in detail in this embodiment may be found in the methods provided in the embodiments of the present invention.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (11)

1. A method of evaporative cooling unit control, the method comprising:
detecting inlet and outlet temperature difference delta T of an evaporative cooling unit;
when the inlet and outlet temperature difference DeltaT is not in the preset temperature difference range, adjusting the frequency of a fan and/or the frequency of a water pump so that the inlet and outlet temperature difference DeltaT is in the preset temperature difference range;
when the inlet and outlet temperature difference DeltaT is within a preset temperature difference range, the current fan frequency and the current water pump frequency are maintained;
when the inlet-outlet temperature difference DeltaT is within the preset temperature difference range, the method further comprises the following steps:
detecting the water mist droplet size D;
when the water mist droplet size D is not in the preset droplet diameter range, adjusting the frequency of the air compressor so that the water mist droplet size D is in the preset droplet diameter range;
when the water mist droplet size D is within the preset droplet diameter range, detecting the inlet and outlet temperature difference delta T of the evaporative cooling unit again;
and when the inlet and outlet temperature difference DeltaT is within the preset temperature difference range, the current fan frequency and the current water pump frequency are maintained.
2. The method according to claim 1, wherein detecting the inlet-outlet temperature difference Δt of the evaporative cooling unit includes:
when the evaporative cooling unit works, the temperature at the inlet and the temperature at the outlet are detected by an inlet temperature sensor and an outlet temperature sensor respectively, and the inlet-outlet temperature difference DeltaT is calculated according to the temperature at the inlet and the temperature at the outlet.
3. The method according to claim 1, wherein when the inlet-outlet temperature difference Δt is not within a preset temperature difference range, adjusting a fan frequency and/or a water pump frequency so that the inlet-outlet temperature difference Δt is within the preset temperature difference range, comprises:
if the inlet and outlet temperature difference is smaller than the minimum temperature difference A, gradually increasing the fan frequency according to P=P01+t1, gradually increasing the water pump frequency according to M=M0+tK, and detecting the inlet and outlet temperature difference DeltaT in real time until the inlet and outlet temperature difference reaches the minimum temperature difference A;
if the inlet and outlet temperature difference is larger than the maximum temperature difference B, gradually reducing the frequency of the fan according to P=P01-tN 1, gradually reducing the frequency of the water pump according to M=M0-tK, and detecting the inlet and outlet temperature difference DeltaT in real time until the inlet and outlet temperature difference is reduced to the maximum temperature difference B;
wherein, P01 fan initial frequency, t is iteration number, N1 is fan frequency increment, P represents the frequency of the fan in the iteration process, M0 is water pump initial frequency, K is fan frequency increment, and M represents the frequency of the water pump in the iteration process.
4. The method of claim 1, wherein detecting the water mist droplet size D comprises:
and shooting water mist droplet image information by a shooting unit, and calculating the average value of the particle sizes of the water mist droplets according to the droplet image information to obtain the water mist droplet size D.
5. The method of claim 1, wherein adjusting the air compressor frequency to bring the water mist droplet size D within the preset droplet diameter range when the water mist droplet size D is not within the preset droplet diameter range comprises:
if the water mist droplet size D is smaller than the minimum set value E, gradually reducing the frequency of the air compressor according to P' =P02-tN 2, and detecting the water mist droplet size D in real time until the water mist droplet size D reaches the minimum set value E;
if the water mist droplet size D is larger than the maximum set value F, gradually increasing the frequency of the air compressor according to P' =P02+tN2, and detecting the water mist droplet size D in real time until the water mist droplet size D is reduced to the maximum set value F;
wherein P02 is the initial frequency of the air compressor, t is the iteration number, N2 is the frequency increment of the air compressor, and P' represents the frequency of the air compressor in the iteration process.
6. The method of claim 4, wherein capturing the water mist droplet image information by the capturing unit comprises:
the water mist is illuminated by emitting laser light through a pulse laser;
while capturing image information of the illuminated area through a camera lens.
7. A control device for an evaporative cooling unit, the control device comprising:
the signal receiving processor is respectively connected with the air inlet temperature sensor and the air outlet temperature sensor;
the signal receiving processor is also connected with a fan and a water pump of the evaporative cooling unit;
the air inlet temperature sensor is arranged at the air inlet of the unit, the air outlet temperature sensor is arranged at the air outlet of the unit, and the air inlet temperature sensor and the air outlet temperature sensor are respectively used for detecting the temperatures of the air inlet and the air outlet of the unit and transmitting the two temperatures to the signal receiving processor;
the signal receiving processor is used for calculating the inlet and outlet temperature difference delta T of the evaporative cooling unit according to the two temperatures;
when the inlet and outlet temperature difference DeltaT is within a preset temperature difference range, indicating the fan and the water pump to respectively maintain the current fan frequency and the current water pump frequency;
the signal receiving processor is also connected with the air compressor and the shooting unit;
the shooting unit is used for shooting water mist drop image information and sending the water mist drop image information to the signal receiving processor;
the signal receiving processor is further used for indicating the fan to adjust the fan frequency and/or indicating the water pump to adjust the water pump frequency when the inlet and outlet temperature difference delta T is not in a preset temperature difference range, so that the inlet and outlet temperature difference delta T is in the preset temperature difference range;
when the inlet and outlet temperature difference DeltaT is within the preset temperature difference range, the shooting unit is instructed to shoot water mist droplet image information, and the water mist droplet size D is calculated according to the water mist droplet image information;
and the air compressor is used for indicating the air compressor to adjust the frequency of the air compressor when the water mist droplet size D is not in the preset droplet diameter range so that the water mist droplet size D is in the preset droplet diameter range;
and the device is used for detecting the inlet and outlet temperature difference delta T of the evaporative cooling unit again when the water mist droplet size D is within the preset droplet diameter range.
8. The control device of claim 7, wherein the assembly comprises:
a gas diverter, a liquid diverter, and a gas-liquid mixing nozzle;
the gas-liquid mixing nozzle is respectively connected with the gas diverter and the liquid diverter, the gas diverter is connected with the air compressor, and the liquid diverter is connected with the water pump.
9. The control apparatus according to claim 7, wherein the photographing unit includes:
the camera lens is connected with the signal receiving processor and is used for shooting the image information of the water mist liquid drops;
the synchronous controller, the pulse laser, the light guide arm and the light source port are sequentially connected and are used for providing illumination when the camera lens shoots; the synchronous controller is connected with the signal receiving processor and used for precisely controlling the time synchronization of illumination and shooting.
10. An air conditioning apparatus comprising a control device of an evaporative cooling unit according to any one of claims 7 to 9, and the evaporative cooling unit.
11. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any of claims 1-6.
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CN111076328A (en) * 2019-12-30 2020-04-28 弘明环保节能科技(广东)有限公司 Factory building evaporative cooling system
CN214038847U (en) * 2020-11-23 2021-08-24 珠海格力电器股份有限公司 Evaporative cooling unit control device and air conditioning equipment

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BE655901A (en) * 1963-11-19 1965-05-18
CN1062205A (en) * 1990-10-30 1992-06-24 沃尔特·F·艾伯斯 Conduct heat in the time of single hose and the method and apparatus of mass transfer
CN111076328A (en) * 2019-12-30 2020-04-28 弘明环保节能科技(广东)有限公司 Factory building evaporative cooling system
CN214038847U (en) * 2020-11-23 2021-08-24 珠海格力电器股份有限公司 Evaporative cooling unit control device and air conditioning equipment

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