CN113654145B - Spraying system of indirect evaporative cooling unit and air supply temperature control method - Google Patents
Spraying system of indirect evaporative cooling unit and air supply temperature control method Download PDFInfo
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- CN113654145B CN113654145B CN202110973030.0A CN202110973030A CN113654145B CN 113654145 B CN113654145 B CN 113654145B CN 202110973030 A CN202110973030 A CN 202110973030A CN 113654145 B CN113654145 B CN 113654145B
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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
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
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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
- F24F11/72—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
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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
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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
- F24F11/87—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units
- F24F11/871—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling absorption or discharge of heat in outdoor units by controlling outdoor fans
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention discloses a spraying system of an indirect evaporative cooling unit, which comprises a spraying support, a spraying assembly, a stroke motor and a transmission assembly, wherein the spraying assembly comprises a water inlet pipe, a water spraying hose and a water spraying pipe which are sequentially communicated, a low-pressure spray head is arranged on the water spraying pipe, a stroke main rod is arranged on the spraying support, the water spraying pipe is in sliding connection with the stroke main rod through a sliding seat, and the stroke motor drives the water spraying pipe to reciprocate along the straight line of the stroke main rod through the transmission assembly. In addition, the invention also comprises a method for controlling the air supply temperature of the indirect evaporative cooling unit based on the novel spraying system, wherein on one hand, a low-pressure circulating spraying mode is adopted, so that the use amount and the splashing amount of spray water are effectively reduced, an obvious water-saving effect is achieved, on the other hand, the spraying system is enabled to work in an intervening manner earlier, the opening time of the spraying system is prolonged, the power consumption of a fan is reduced, and the purpose of saving energy is achieved.
Description
Technical Field
The invention relates to a spraying system of an indirect evaporative cooling unit and an air supply temperature control method, and belongs to the technical field of refrigeration of data centers.
Background
The data center refrigeration technology is developed gradually through the periods of an air-cooled direct expansion system, a water cooling system, a water side natural cooling system, an air side natural cooling system and the like. The indirect evaporative cooling mode is adopted more and more in the prior large-scale data center, and compared with the traditional fresh air natural cooling and chilled water cooling system, the indirect evaporative cooling technology has the characteristics and advantages that indoor air is not influenced by outdoor environment air quality, indoor humidity cannot be influenced by spraying humidifying air, filter maintenance cost is low, water consumption is low, energy saving level is high, and the like.
As shown in figure 1, the indirect evaporative cooling unit mainly comprises a compressor 1, an evaporator 2, an expansion valve 3, a condenser 4, an outdoor fan 5, an indoor fan 6, an air-air heat exchanger 7, a spraying system 8 and an equipment shell 9, and the principle is that a spraying evaporation technology is adopted, and the air-air heat exchanger is used as a heat exchange carrier, so that return air of a heat channel of a data center is cooled, the starting time of the compressor is effectively reduced, and the significance of energy conservation is achieved.
However, the traditional spraying system adopts high-pressure spraying, so that the spraying amount is large, and a lot of water is not evaporated but blown away, thereby greatly increasing the WUE of the unit operation and increasing the waste of water resources. Meanwhile, the air supply temperature control scheme of the traditional indirect evaporative cooling unit is generally divided into three operation modes for air supply temperature control, namely a dry mode, a wet mode and a mixed mode, and the control scheme does not realize the maximum utilization of the indirect evaporative cooling energy-saving technology.
Disclosure of Invention
The invention aims to: aiming at the problems existing in the prior art, the invention provides a spraying system and an air supply temperature control method of an indirect evaporative cooling unit, which adopt a low-pressure circulating spraying mode on one hand, effectively reduce the use amount and the splashing amount of spraying water, have obvious water-saving effect, and on the other hand, enable the spraying system to work in an early intervention mode, prolong the opening time of the spraying system, reduce the power consumption of a fan and achieve the purpose of saving energy.
The technical scheme is as follows: in order to achieve the above purpose, the invention provides a spray system of an indirect evaporative cooling unit, which comprises a spray bracket, a spray assembly, a travel motor and a transmission assembly, wherein the spray assembly comprises a water inlet pipe, a water spray hose and a water spray pipe which are sequentially communicated, a low-pressure spray nozzle is arranged on the water spray pipe, a travel main rod is arranged on the spray bracket, the water spray pipe is in sliding connection with the travel main rod through a sliding seat, and the travel motor drives the water spray pipe to reciprocate along the straight line of the travel main rod through the transmission assembly.
Further, the transmission assembly comprises a transmission chain, a transmission gear and a tensioning gear, the transmission gear is in sleeve joint transmission with an output shaft of the travel motor, the transmission chain is tensioned between the transmission gear and the tensioning gear, the spray pipe is fixedly connected with the transmission chain through a sliding seat, and the travel motor realizes linear reciprocating driving of the spray pipe through gear chain transmission.
Further, the spray support is provided with a travel auxiliary rod, and the spray pipe is in sliding connection with the travel auxiliary rod through the sliding seat, so that the stability of the movement of the spray pipe is improved.
Further, a hose supporting rod is arranged on the spraying support, and the water spraying hose is connected to the hose supporting rod through a plurality of sliding rings, so that the expansion stability of the water spraying hose is improved.
Further, in order to ensure the long-term high-efficiency operation of the heat exchanger, the spraying system further comprises a dosing and cleaning device, wherein the dosing and cleaning device comprises a dosing barrel, a dosing pipe and a dosing pump which are sequentially communicated, and the dosing pump is communicated with a water inlet pipe and a water spraying hose through a three-way valve so as to realize an automatic dosing and cleaning function.
Furthermore, the spraying system further comprises a spraying control board, the water inlet pipe is provided with a water inlet valve, and the spraying control board is respectively connected with the water inlet valve, the stroke motor and the dosing pump in a signal manner and is used for realizing spraying and dosing cleaning control.
Further, the control logic of the spray control board comprises:
when the spraying control board receives a spraying demand, firstly starting a dosing pump and a stroke motor, driving a spray pipe to finish a dosing cleaning process through the stroke motor, and then closing the dosing pump, opening a water inlet valve and entering a spraying process;
when the accumulation of the spraying process reaches the set time, closing the water inlet valve, starting the dosing pump, closing the dosing pump, opening the water inlet valve after finishing the dosing cleaning process, and re-entering the spraying process;
when the spray control board receives the requirement of stopping spraying, the water inlet valve is closed, the dosing pump is started, after the dosing cleaning process is completed, the dosing pump and the stroke motor are closed, and spraying is finished.
An air supply temperature control method of an indirect evaporative cooling unit based on the spraying system comprises the following steps:
1) Firstly, enabling an outdoor fan to operate at 50% of rotating speed, enabling an indoor fan to operate at 100% of rotating speed, reducing the rotating speed of the outdoor fan to meet the set requirement of the air supply temperature if the air supply temperature is smaller than a set value, and entering step 2 if the air supply temperature is larger than the set value;
2) Starting a spraying system, adjusting the running speed of a stroke motor to meet the set requirement of the air supply temperature, and entering the step 3 if the stroke motor runs at the highest speed and still cannot meet the set requirement;
3) Increasing the rotating speed of the outdoor fan to meet the set requirement of the air supply temperature, and if the rotating speed of the outdoor fan is increased to 100% and still cannot meet the set requirement, entering the step 4);
4) Starting the compressor and adjusting the rotating speed of the compressor to meet the set requirement of the air supply temperature.
Further, the step 2) specifically includes: starting the spraying system and running the travel motor at the highest speed, if the air supply temperature is smaller than the set value, reducing the speed of the travel motor to meet the set requirement of the air supply temperature, and if the air supply temperature is larger than the set value, entering the step 3).
The beneficial effects are that: compared with the prior art, the spraying system and the air supply temperature control method of the indirect evaporative cooling unit provided by the invention have the following advantages:
1. the water conservation is obvious: the low-pressure circulating spraying mode is adopted, so that the using amount of spraying water can be reduced, the floating and splashing water amount is effectively reduced, and compared with the traditional high-pressure spraying mode, the water-saving effect is obvious;
2. the maintenance is convenient: the automatic dosing and cleaning function is realized through the built-in dosing and cleaning device, the risk of scale formation of the air-air heat exchanger is effectively reduced, the system is fully-automatic, only the chemical agent is needed to be supplemented regularly, the traditional spraying system is required to be stopped for cleaning, and the system is maintained through manual cleaning;
3. the working is stable: because the low-pressure spraying (3-6 bar water pressure) is adopted, a spraying water pump is not required to be arranged, and the water pump can be directly connected into field softened water for use, and the traditional spraying system is required to be provided with the water pump, so that the power consumption of the water pump is increased, and meanwhile, the fault point of the water pump is also brought;
4. energy saving and high efficiency: by the optimal design of the air supply temperature control scheme, the spraying system is intervened in advance, the starting time of the spraying system is prolonged, and the full-speed running time of the outdoor fan is reduced, so that the aim of saving energy is fulfilled.
Drawings
FIG. 1 is a schematic diagram of the operation of a conventional indirect evaporative cooling unit;
FIG. 2 is a logic diagram of the supply air temperature control of a conventional indirect evaporative cooling unit;
FIG. 3 is a schematic diagram of a spray system in accordance with an embodiment of the present invention;
FIG. 4 is a schematic diagram of a spray system according to an embodiment of the present invention;
FIG. 5 is a control logic diagram of a shower control panel in an embodiment of the present invention;
FIG. 6 is a logic diagram illustrating the temperature control of the air supplied by an intermediate evaporative cooling unit in accordance with an embodiment of the present invention;
the drawings include: 1. the device comprises a compressor, 2, an evaporator, 3, an expansion valve, 4, a condenser, 5, an outdoor fan, 6, an indoor fan, 7, an air-air heat exchanger, 8, a spraying system, 9, an equipment shell, 10, a low-pressure spray nozzle, 11, a dosing pump, 12, a spraying control board, 13, a constant-pressure valve, 14, a stroke motor, 15, a supporting side plate, 16, a stroke main rod, 17, a stroke auxiliary rod, 18, a spray pipe, 19, a slide seat, 20, a water spraying hose, 21, a hose supporting rod, 22, a slip ring, 23 and a three-way valve.
Detailed Description
The following description of the preferred embodiments of the present invention will be made with reference to the accompanying drawings, to more clearly and completely illustrate the technical aspects of the present invention.
Fig. 4 shows a novel spray system of an indirect evaporative cooling unit, which comprises a spray bracket, a spray assembly, a travel motor 14, a transmission assembly and a drainage assembly, wherein the spray bracket comprises two support side plates 15 which are arranged oppositely, and a travel main rod 16, a travel auxiliary rod 17 and a hose support rod 21 are erected between the two support side plates 15. The spray assembly comprises a water inlet pipe, a water spraying hose 20, a water spraying pipe 18 and a low-pressure spray head 10 which are sequentially communicated, the low-pressure spray head 10 is arranged on the water spraying pipe 18, the water spraying pipe 18 is in sliding connection with a travel main rod 16 and a travel auxiliary rod 17 through a sliding seat 19, and the water spraying hose 20 is connected to a hose supporting rod 21 through a plurality of sliding rings 22.
In this embodiment, the transmission assembly includes a transmission chain, a transmission gear and a tensioning gear, the stroke motor 14 and the tensioning gear are respectively mounted on the two support side plates 15, the transmission gear is in sleeve connection with an output shaft of the stroke motor 14, the transmission chain is tensioned between the transmission gear and the tensioning gear, the spray pipe 18 is fixedly connected with the transmission chain through the sliding seat 19, and the stroke motor 14 realizes linear reciprocating driving of the spray pipe 18 along the stroke main rod 16 through gear chain transmission.
In the invention, the transmission assembly is not limited to the motor chain transmission mode, and in other embodiments, a linear driving mode such as a ball screw, a pneumatic sliding rail and the like can be adopted.
In addition, the drainage assembly comprises a water receiving disc and a drainage pipe, wherein the water receiving disc is communicated with the drainage pipe and used for realizing direct drainage. Because the spray water quantity and the splashing water quantity of the novel spray system are greatly reduced, most of water sprayed on the surface of the heat exchanger is evaporated, so that the water discharge quantity is less, and the water resource utilization rate is high.
In order to ensure long-term and efficient operation of the heat exchanger, a cleaning system of the heat exchanger is particularly important. The novel dosing cleaning device of the spraying system comprises a dosing barrel, a dosing pipe and a dosing pump 11 which are sequentially communicated, wherein the dosing pump 11 is communicated with a water inlet pipe and a water spraying hose 20 through a three-way valve 23 so as to realize an automatic dosing cleaning function.
As shown in fig. 3, the water inlet pipe is provided with a constant pressure valve 13 for monitoring and accurately controlling the water inlet; the spraying system further comprises a spraying control board 12, wherein the spraying control board 12 is respectively connected with a constant pressure valve 13, a dosing pump 11, a stroke motor 14 and the like in a signal manner and is used for controlling the full-automatic operation of the spraying system. As shown in fig. 5, the control logic of the shower control board 12 includes:
when the spray control board 12 receives a spray demand, firstly, the dosing pump 11 and the travel motor 14 are started, the spray pipe 18 is driven by the travel motor 14 to complete a dosing and cleaning process (at least one reciprocating driving process), then the dosing pump 11 is closed, the constant pressure valve 13 (i.e. a spray valve) is opened, and the spray process is entered;
when the accumulation of the spraying process reaches the set time, closing the constant pressure valve 13, starting the dosing pump 11, closing the dosing pump, opening the water inlet valve and re-entering the spraying process after finishing the dosing cleaning process;
when the spray control board 12 receives the requirement of stopping spraying, the constant pressure valve 13 is closed, the dosing pump 11 is started, after the dosing cleaning process is completed, the dosing pump 11 and the travel motor 14 are closed, and spraying is finished.
Therefore, the novel spraying system can realize full-automatic operation, is not required to be manually cleaned and maintained after being stopped, and only needs to supplement special non-toxic and harmless cleaning agents into the dosing barrel regularly, so that the surface cleaning and scale inhibition of the heat exchanger are ensured, the heat exchanger cannot be corroded, the growth of microorganisms is prevented, and the cleaning and maintenance process is safe and efficient, and is time-saving and labor-saving.
The novel spray system is different from the traditional control scheme in control method, when the novel spray control system is started by a unit, firstly, the outdoor fan is operated at 50% of rotating speed, if the air supply temperature control fails to reach the design temperature, the spray system starts to operate, the operation speed of the travel motor is adjusted according to the setting of the air supply temperature, and the set requirement of the air supply temperature is met. When the stroke motor operates at the highest speed, if the air supply temperature still cannot meet the set value requirement, the rotating speed of the outdoor fan is started to be increased.
In the conventional indirect evaporative cooling control mode (as shown in fig. 2), firstly, the fan speed is accelerated from the lowest speed to the highest speed to meet the design requirement of the air supply temperature, when the outdoor fan operates at the highest speed, the air supply temperature is still higher than the design value, and at the moment, the spray water pump (i.e. high-pressure spray) is started to enter the wet mode operation. The biggest difference between the two control schemes is the intervention time of the spraying mode, and the novel spraying system can enable the spraying mode to be intervened earlier through the optimized design scheme, so that the power consumption of a fan is saved, and the purpose of saving energy is achieved.
Fig. 6 shows a method for controlling the air supply temperature of an indirect evaporative cooling unit based on the novel spray system, which specifically comprises the following steps:
1) Firstly, enabling an outdoor fan to operate at 50% of rotating speed, enabling an indoor fan to operate at 100% of rotating speed, reducing the rotating speed of the outdoor fan to meet the set requirement of the air supply temperature if the air supply temperature is smaller than a set value, and entering step 2 if the air supply temperature is larger than the set value;
2) Starting a spraying system and running a travel motor at the highest speed, if the air supply temperature is smaller than a set value, reducing the speed of the travel motor to meet the set requirement of the air supply temperature, and if the air supply temperature is larger than the set value, entering a step 3);
3) Increasing the rotating speed of the outdoor fan to meet the set requirement of the air supply temperature, and if the rotating speed of the outdoor fan is increased to 100% and still cannot meet the set requirement, entering the step 4);
4) The compressor is turned on (i.e., the mechanical refrigeration system is started) and the rotational speed of the compressor is adjusted to meet the set demand for the supply air temperature.
The utility model discloses a through a set of brand-new solution that sprays, carried out the combination optimization on spraying system and control method, on the one hand adopted low pressure circulation to spray the mode, effectively reduced the quantity of using of spray water and splash volume, improved water resource utilization, on the other hand made the earlier intervention work of spraying system, utilized the evaporation cooling technique that sprays to the maximum to reduce fan consumption, improve the energy efficiency ratio of unit, reduce computer lab PUE.
The above detailed description is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Various modifications, substitutions and improvements of the technical scheme of the present invention will be apparent to those skilled in the art from the description and drawings provided herein without departing from the spirit and scope of the invention.
Claims (4)
1. The spray system of the indirect evaporative cooling unit is characterized by comprising a spray bracket, a spray assembly, a travel motor and a transmission assembly, wherein the spray assembly comprises a water inlet pipe, a water spray hose and a water spray pipe which are sequentially communicated, a low-pressure spray nozzle is arranged on the water spray pipe, a travel main rod is arranged on the spray bracket, the water spray pipe is in sliding connection with the travel main rod through a sliding seat, and the travel motor drives the water spray pipe to reciprocate along the straight line of the travel main rod through the transmission assembly;
the transmission assembly comprises a transmission chain, a transmission gear and a tensioning gear, the transmission gear is in sleeve joint transmission with an output shaft of the travel motor, the transmission chain is tensioned between the transmission gear and the tensioning gear, the spray pipe is fixedly connected with the transmission chain through a sliding seat, and the travel motor realizes linear reciprocating driving of the spray pipe through gear chain transmission;
the air supply temperature control method of the indirect evaporative cooling unit comprises the following steps of:
1) Firstly, enabling an outdoor fan to operate at 50% of rotating speed, enabling an indoor fan to operate at 100% of rotating speed, reducing the rotating speed of the outdoor fan to meet the set requirement of the air supply temperature if the air supply temperature is smaller than a set value, and entering step 2 if the air supply temperature is larger than the set value;
2) Starting a spraying system, adjusting the running speed of a stroke motor to meet the set requirement of the air supply temperature, and entering the step 3 if the stroke motor runs at the highest speed and still cannot meet the set requirement;
3) Increasing the rotating speed of the outdoor fan to meet the set requirement of the air supply temperature, and if the rotating speed of the outdoor fan is increased to 100% and still cannot meet the set requirement, entering the step 4);
4) Starting the compressor and adjusting the rotating speed of the compressor to meet the set requirement of the air supply temperature;
the step 2) specifically comprises the following steps: starting a spraying system and running a travel motor at the highest speed, if the air supply temperature is smaller than a set value, reducing the speed of the travel motor to meet the set requirement of the air supply temperature, and if the air supply temperature is larger than the set value, entering a step 3);
the spray bracket is provided with a travel auxiliary rod, and the spray pipe is in sliding connection with the travel auxiliary rod through a sliding seat; the spray support is provided with a hose support rod, and the water spray hose is connected to the hose support rod through a plurality of slip rings.
2. The spray system of an indirect evaporative cooling unit according to claim 1, further comprising a dosing and cleaning device, wherein the dosing and cleaning device comprises a dosing barrel, a dosing pipe and a dosing pump which are sequentially communicated, and the dosing pump is communicated with the water inlet pipe and the water spraying hose through a three-way valve.
3. The spray system of an indirect evaporative cooling unit according to claim 2, further comprising a spray control board, wherein the water inlet pipe is provided with a water inlet valve, and the spray control board is respectively connected with the water inlet valve, the stroke motor and the dosing pump in a signal manner and is used for realizing spray and dosing cleaning control.
4. A spray system of an indirect evaporative cooling unit according to claim 3, wherein the control logic of the spray control board comprises:
when the spraying control board receives a spraying demand, firstly starting a dosing pump and a stroke motor, driving a spray pipe to finish a dosing cleaning process through the stroke motor, and then closing the dosing pump, opening a water inlet valve and entering a spraying process;
when the accumulation of the spraying process reaches the set time, closing the water inlet valve, starting the dosing pump, closing the dosing pump, opening the water inlet valve after finishing the dosing cleaning process, and re-entering the spraying process;
when the spray control board receives the requirement of stopping spraying, the water inlet valve is closed, the dosing pump is started, after the dosing cleaning process is completed, the dosing pump and the stroke motor are closed, and spraying is finished.
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| CN202110973030.0A CN113654145B (en) | 2021-08-24 | 2021-08-24 | Spraying system of indirect evaporative cooling unit and air supply temperature control method |
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| CN202110973030.0A CN113654145B (en) | 2021-08-24 | 2021-08-24 | Spraying system of indirect evaporative cooling unit and air supply temperature control method |
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