CN113864988A - Air conditioning unit and control method thereof - Google Patents
Air conditioning unit and control method thereof Download PDFInfo
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- CN113864988A CN113864988A CN202111248848.2A CN202111248848A CN113864988A CN 113864988 A CN113864988 A CN 113864988A CN 202111248848 A CN202111248848 A CN 202111248848A CN 113864988 A CN113864988 A CN 113864988A
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- water inlet
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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
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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
- F24F11/84—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 valves
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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
- F24F11/873—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling refrigerant heaters
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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
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/003—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus specially adapted for cooling towers
Abstract
The invention discloses an air conditioning unit and a control method thereof, wherein the air conditioning unit comprises: a cold water main machine; a cooling tower; a water inlet pipe of the cooling tower; a cooling tower water outlet pipeline; one end of the cooling tower water inlet and outlet bypass pipeline is connected with the cooling tower water inlet pipeline, and the other end of the cooling tower water inlet and outlet bypass pipeline is connected with the cooling tower water outlet pipeline and is used for bypassing a water part in the cooling tower water inlet pipeline to the cooling tower water outlet pipeline; and the bypass valve is positioned on the cooling tower water inlet and outlet bypass pipeline and is used for controlling the water flow bypassing the cooling tower water outlet pipeline. The invention solves the problems that the cooling water return temperature of the water chilling unit is too low and fluctuates greatly under the low temperature condition in the prior art, so that the unit can not prepare chilled water or the prepared chilled water has large temperature fluctuation, can ensure that the unit cooling water inlet temperature fluctuates less under the cold climate condition, and ensures that the unit can stably prepare chilled water with accurate temperature.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to an air conditioning unit and a control method thereof.
Background
Under the condition of cold climate, due to the requirements of some production processes or environments, a water chilling unit is required to provide stable low-temperature chilled water with accurate outlet water temperature, the requirement on the water supply temperature of the low-temperature chilled water is very high, and the accuracy is usually required to be within 1 ℃. Under the condition of winter or cold regions, due to the influence of outdoor environment temperature, the inlet water temperature of the cooling water fed back to the water chilling unit through the cooling tower is generally low and fluctuates greatly, the water chilling unit has certain range limitation on the inlet water temperature of the cooling water, when the inlet water temperature of the cooling water exceeds the range or fluctuates greatly, the working condition of the unit is unstable, the adverse effect is caused on the unit to provide chilled water with accurate temperature, and when the unit cannot reach the working state of providing chilled water meeting the temperature requirement in a certain time, the flow of the whole production process is possibly damaged, and loss is caused.
In addition, when the unit needs to be restarted due to the shutdown protection caused by the low inlet water temperature of the cooling water, the time from startup to stabilization is long, and the production process flow is also damaged.
Aiming at the problems that in the prior art, the return water temperature of cooling water of a water chilling unit is too low and fluctuates greatly under the low-temperature condition, so that the unit cannot prepare chilled water or the prepared chilled water has large temperature fluctuation, an effective solution is not provided at present.
Disclosure of Invention
The invention provides an air conditioning unit and a control method thereof, which at least solve the problem that the unit cannot prepare chilled water or the prepared chilled water has large temperature fluctuation due to the fact that the return water temperature of cooling water of a water chilling unit is too low and the fluctuation is large under the low-temperature condition in the prior art.
To solve the above technical problem, according to an aspect of an embodiment of the present invention, there is provided an air conditioning unit, including:
a cold water main machine;
a cooling tower;
one end of the cooling tower water inlet pipeline is connected with a water outlet of the cold water main machine, and the other end of the cooling tower water inlet pipeline is connected with a water inlet of the cooling tower;
one end of the cooling tower water outlet pipeline is connected with a water outlet of the cooling tower, and the other end of the cooling tower water outlet pipeline is connected with a water inlet of the cold water main machine;
one end of the cooling tower water inlet and outlet bypass pipeline is connected with the cooling tower water inlet pipeline, and the other end of the cooling tower water inlet and outlet bypass pipeline is connected with the cooling tower water outlet pipeline and is used for bypassing a water part in the cooling tower water inlet pipeline to the cooling tower water outlet pipeline;
and the bypass valve is positioned on the cooling tower water inlet and outlet bypass pipeline and is used for controlling the water flow bypassing the cooling tower water outlet pipeline.
Further, still include: the cooling tower water inlet switch valve is positioned on a cooling tower water inlet pipeline between a water inlet of the cooling tower and the first connecting point; the first connecting point is a connecting point of a cooling tower water inlet and outlet bypass pipeline and a cooling tower water inlet pipeline.
Further, still include: the first electric heating belt is positioned on a water inlet pipeline of the cooling tower between a water inlet of the cooling tower and a water inlet switch valve of the cooling tower; the second electric heating belt is positioned on the water outlet pipeline of the cooling tower; and the third electric heating belt is positioned on the water inlet and outlet bypass pipeline of the cooling tower.
Further, still include: the cooling water inlet temperature sensor is positioned at the water inlet of the cold water main machine and used for detecting the cooling water inlet temperature; and the outdoor temperature sensor is positioned outside the cooling tower and used for detecting the outdoor environment temperature.
Further, still include: one end of the water tank is connected with a water outlet pipeline of the cooling tower, and the other end of the water tank is connected with a water inlet of the cold water main machine; and the cooling water pump is positioned on a pipeline between the water tank and the water inlet of the cold water main machine.
According to another aspect of the embodiments of the present invention, there is provided an air conditioning unit control method, applied to the air conditioning unit, including: detecting the running state of the air conditioning unit; when the running state is a normal running state, detecting the water inlet temperature of the cooling water; and controlling the operation of the air conditioning unit according to the inlet water temperature of the cooling water.
Further, the operation of the air conditioning unit is controlled according to the inlet water temperature of the cooling water, and the method comprises the following steps: when the cooling water inlet temperature is continuously lower than a first preset temperature for a first preset time, controlling a fan of the cooling tower to reduce a preset rotating speed; detecting whether the inlet water temperature of the cooling water is greater than or equal to a first preset temperature, if so, keeping the current rotating speed of the fan, otherwise, continuously controlling the fan to reduce the preset rotating speed; and when the current rotating speed of the fan is less than the preset minimum rotating speed, controlling the fan to stop.
Further, according to the operation of cooling water temperature control air conditioning unit that intakes, still include: when the inlet water temperature of the cooling water is continuously lower than a second preset temperature for a second preset time, controlling the bypass valve to open; wherein the second preset temperature is lower than the first preset temperature; the initial opening degree of the bypass valve after the bypass valve is opened is a first preset opening degree, the maximum opening degree of the bypass valve is a second preset opening degree, and the second preset opening degree is larger than the first preset opening degree.
Further, when the operation state is the normal operation state, the method further comprises the following steps: detecting the outdoor environment temperature; and when the outdoor environment temperature is lower than the third preset temperature, the first electric heating belt is started.
Further, after controlling the operation of the air conditioning unit according to the inlet water temperature of the cooling water, the method further comprises the following steps: re-detecting the water inlet temperature of the cooling water; and when the cooling water inlet temperature is less than the lowest cooling water inlet temperature plus the preset temperature difference, controlling the second electric heating belt and the third electric heating belt to be started until the cooling water inlet temperature is greater than the lowest cooling water inlet temperature, and the change value of the cooling water inlet temperature is less than the preset change value.
Further, still include: when the running state is a starting-up state or a restarting state after shutdown protection, controlling a water inlet switch valve of the cooling tower to be closed, and controlling a bypass valve to be opened to the maximum opening degree; and detecting the water inlet temperature of the cooling water, controlling the water inlet switch valve of the cooling tower to be opened and controlling the bypass valve to be closed when the water inlet temperature of the cooling water is higher than a fourth preset temperature, and then controlling the air conditioning unit to enter a normal running state.
According to yet another aspect of an embodiment of the present invention, there is provided a storage medium containing computer-executable instructions for performing the air conditioning unit control method as described above when executed by a computer processor.
The invention provides a water chilling unit system capable of providing chilled water with accurate temperature in cold climate, wherein a cooling tower water inlet and outlet bypass pipeline is arranged between a cooling tower water inlet pipeline and a cooling tower water outlet pipeline and is used for bypassing a water part in the cooling tower water inlet pipeline to the cooling tower water outlet pipeline so as to prevent the cooling water return water temperature of the water chilling unit from being too low under low temperature condition, and the water flow bypassing the cooling tower water outlet pipeline is controlled by a bypass valve on the cooling tower water inlet and outlet bypass pipeline so as to prevent the cooling water temperature from greatly fluctuating. The unit can provide chilled water with accurate temperature under the condition of cold climate, and can be safely and stably operated for a long time, the inlet water temperature of the cooling water is always maintained within the range of normal operation of the unit, and the fluctuation is small.
Drawings
FIG. 1 is a schematic view of an alternative installation of an air conditioning assembly according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an alternative connection of an air conditioning assembly according to an embodiment of the present invention; and
fig. 3 is an alternative flow chart of an air conditioning unit control method according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention.
Example 1
In a preferred embodiment 1 of the present invention, there is provided an air conditioning assembly, and in particular, fig. 1 shows an alternative installation schematic of the air conditioning assembly, as shown in fig. 1, the assembly comprising:
a cold water main machine 1;
a cooling tower 3;
one end of the cooling tower water inlet pipeline 2 is connected with a water outlet of the cold water main machine 1, and the other end of the cooling tower water inlet pipeline is connected with a water inlet of the cooling tower 3;
one end of the cooling tower water outlet pipeline 4 is connected with the water outlet of the cooling tower 3, and the other end of the cooling tower water outlet pipeline is connected with the water inlet of the cold water main machine 1;
one end of the cooling tower water inlet and outlet bypass pipeline 7 is connected with the cooling tower water inlet pipeline 2, and the other end of the cooling tower water inlet and outlet bypass pipeline is connected with the cooling tower water outlet pipeline 4 and is used for bypassing a part of water in the cooling tower water inlet pipeline 2 to the cooling tower water outlet pipeline 4;
as shown in fig. 1, the method further includes: one end of the water tank 5 is connected with the water outlet pipeline 4 of the cooling tower, and the other end of the water tank is connected with the water inlet of the cold water main unit 1 and used for recovering cooling water exposed in the relevant pipelines in the outdoor environment under the cold weather condition; and the cooling water pump 6 is positioned on a pipeline between the water tank 5 and the water inlet of the cold water main machine 1.
Under normal working conditions (when outdoor environment temperature is higher), high-temperature cooling water coming out of the cold water main machine 1 enters the cooling tower 3 through the cooling tower water inlet pipeline 2, is cooled to low-temperature cooling water under the action of the cooling tower 3 fan, then enters the water tank 5 through the cooling tower water outlet pipeline 4, returns to the air conditioner or the cold water main machine again under the action of the cooling water pump 6, and completes a cooling water circulation heat exchange process.
Fig. 2 shows a schematic diagram of an alternative connection of the air conditioning assembly, which, as shown in fig. 2, comprises: and the bypass valve 8 is positioned on the cooling tower water inlet and outlet bypass pipeline 7 and is used for controlling the water flow bypassing the cooling tower water outlet pipeline 4.
In the above embodiment, a cooling water unit system capable of providing chilled water with precise temperature in cold climate is provided, wherein a cooling tower water inlet and outlet bypass pipeline is arranged between a cooling tower water inlet pipeline and a cooling tower water outlet pipeline, and is used for bypassing a part of water in the cooling tower water inlet pipeline to the cooling tower water outlet pipeline, so as to prevent the cooling water return temperature of the cooling water unit from being too low under low temperature conditions, and control water flow bypassing the cooling tower water outlet pipeline through a bypass valve located on the cooling tower water inlet and outlet bypass pipeline, so as to prevent the cooling water temperature from fluctuating greatly. The unit can provide chilled water with accurate temperature under the condition of cold climate, and can be safely and stably operated for a long time, the inlet water temperature of the cooling water is always maintained within the range of normal operation of the unit, and the fluctuation is small.
As shown in fig. 2, the method further includes: the cooling tower water inlet switch valve 9 is positioned on the cooling tower water inlet pipeline 2 between the water inlet of the cooling tower 3 and the first connecting point; wherein, the first connection point is the connection point of the cooling tower water inlet and outlet bypass pipeline 7 and the cooling tower water inlet pipeline 2. The switch valve is arranged on the water inlet pipe of the cooling tower 3, when the system is started under the cold weather condition, the switch valve is closed, and the bypass valve 8 on the water inlet and outlet bypass pipe of the cooling tower 3 is opened, so that the cooling water loop does not flow through the cooling tower 3 and only carries out internal circulation, thereby achieving the purposes of normal starting, rapidness and stability of the system.
When the ambient temperature is lower, in order to avoid the cooling water influent temperature too low, this unit still includes: the first electric heating belt 10 is positioned on the cooling tower water inlet pipeline 2 between the water inlet of the cooling tower 3 and the cooling tower water inlet switch valve 9, and when the measured outdoor environment temperature is less than 0 ℃, the first electric heating belt 10 is started to prevent the cooling water in the pipeline from freezing at a low temperature; the second electric heating belt 11 is positioned on the water outlet pipeline 4 of the cooling tower and used for heating the outlet water of the cooling water; and the third electric heating belt 12 is positioned on the cooling tower water inlet and outlet bypass pipeline 7 and used for heating the cooling water inlet water, so that the cooling water inlet temperature of the water chilling unit is always in the temperature range in which the unit can normally operate, the fluctuation is small, and stable and accurate-temperature low-temperature cold water is continuously provided for the production process.
In addition, the method further comprises the following steps: the cooling water inlet temperature sensor 13 is positioned at the water inlet of the cold water main machine 1 and used for detecting the inlet temperature of the cooling water; an outdoor temperature sensor 14, located outside the cooling tower 3, for detecting the outdoor ambient temperature, and a cooling tower fan 15.
Through the embodiment, the invention can effectively realize that the water chiller unit provides continuous and stable accurate-temperature low-temperature chilled water for the production process under the condition of cold climate, greatly shortens the time of providing the chilled water from the start to the stable work of the water chiller unit, and eliminates the adverse effect on the production process caused by insufficient supply of the chilled water.
Example 2
In a preferred embodiment 2 of the present invention, there is provided an air conditioning unit control method applied to the air conditioning unit in the above embodiment 1. Specifically, fig. 3 shows an alternative flowchart of the method, and as shown in fig. 3, the method includes the following steps S302-S306:
s302: detecting the running state of the air conditioning unit;
s304: when the running state is a normal running state, detecting the water inlet temperature of the cooling water;
s306: and controlling the operation of the air conditioning unit according to the inlet water temperature of the cooling water.
In the above embodiment, a cooling water unit system capable of providing chilled water with precise temperature in cold climate is provided, wherein a cooling tower water inlet and outlet bypass pipeline is arranged between a cooling tower water inlet pipeline and a cooling tower water outlet pipeline, and is used for bypassing a part of water in the cooling tower water inlet pipeline to the cooling tower water outlet pipeline, so as to prevent the cooling water return temperature of the cooling water unit from being too low under low temperature conditions, and control water flow bypassing the cooling tower water outlet pipeline through a bypass valve located on the cooling tower water inlet and outlet bypass pipeline, so as to prevent the cooling water temperature from fluctuating greatly. The unit can provide chilled water with accurate temperature under the condition of cold climate, and can be safely and stably operated for a long time, the inlet water temperature of the cooling water is always maintained within the range of normal operation of the unit, and the fluctuation is small.
The operation of controlling the air conditioning unit according to the cooling water inlet temperature comprises the following steps: when the cooling water inlet temperature is continuously lower than a first preset temperature for a first preset time, controlling a fan of the cooling tower to reduce a preset rotating speed; detecting whether the inlet water temperature of the cooling water is greater than or equal to a first preset temperature, if so, keeping the current rotating speed of the fan, otherwise, continuously controlling the fan to reduce the preset rotating speed; and when the current rotating speed of the fan is less than the preset minimum rotating speed, controlling the fan to stop. For example, when the cooling water is normally operated and the water inlet temperature of the cooling water is less than 20 ℃ and lasts for a certain time, the rotating speed of a fan of the cooling tower is reduced by a specified number of revolutions from the current rotating speed; the control of reducing the rotating speed is continuously carried out, and when the current rotating speed of the fan of the cooling tower is less than the lowest operating rotating speed of the fan (the preset minimum rotating speed), the fan of the cooling tower is stopped.
Further, according to the operation of cooling water temperature control air conditioning unit that intakes, still include: when the inlet water temperature of the cooling water is continuously lower than a second preset temperature for a second preset time, controlling the bypass valve to open; wherein the second preset temperature is lower than the first preset temperature; the initial opening degree of the bypass valve after the bypass valve is opened is a first preset opening degree, the maximum opening degree of the bypass valve is a second preset opening degree, and the second preset opening degree is larger than the first preset opening degree. For example, when the inlet water temperature of the cooling water is less than 18 ℃ and lasts for a certain time, a bypass valve on a bypass pipeline of the inlet water and the outlet water of the cooling tower is opened; the bypass valve is an electric regulating valve with adjustable opening, the initial opening is 20% of the total flow of the cooling water, and proportional differential regulation is carried out according to the inlet water temperature of the cooling water on the basis; the maximum opening is 50% of the total flow of cooling water, so as to prevent the water flow rate from being too low due to too small inflow of the cooling tower, and direct freezing is realized in the cooling process.
When the running state is the normal running state, the method further comprises the following steps: detecting the outdoor environment temperature; and when the outdoor environment temperature is lower than the third preset temperature, the first electric heating belt is started. And when the outdoor environment temperature measured by the outdoor temperature sensor is less than 0 ℃, the first electric heating belt is started to prevent the cooling water in the pipeline at the section from freezing at low temperature.
After the operation of the air conditioning unit is controlled according to the inlet water temperature of the cooling water, the method further comprises the following steps: re-detecting the water inlet temperature of the cooling water; and when the cooling water inlet temperature is less than the lowest cooling water inlet temperature plus the preset temperature difference, controlling the second electric heating belt and the third electric heating belt to be started until the cooling water inlet temperature is greater than the lowest cooling water inlet temperature, and the change value of the cooling water inlet temperature is less than the preset change value. Under the control, the inlet water temperature of the cooling water is still too low continuously, when the inlet water temperature of the cooling water is less than the lowest inlet water temperature of the cold water main machine and is less than +2 ℃, an electric heating belt on a cooling tower inlet and outlet water bypass pipeline and an electric heating belt on a cooling tower outlet water pipeline are started to heat the inlet water of the cooling water, so that the temperature value of the inlet water is always greater than the lowest inlet water temperature of the cold water unit, the temperature fluctuation is reduced, and the working condition of the whole system is always stable under the cold climate condition.
In addition, when the running state is a starting-up state or a restarting state after shutdown protection, the water inlet switch valve of the cooling tower is controlled to be closed, and the bypass valve is controlled to be opened to the maximum opening degree; and detecting the water inlet temperature of the cooling water, controlling the water inlet switch valve of the cooling tower to be opened and controlling the bypass valve to be closed when the water inlet temperature of the cooling water is higher than a fourth preset temperature, and then controlling the air conditioning unit to enter a normal running state. Under the cold weather condition, the time that the cold water set consumes that the stable accurate temperature refrigerated water that provides of operation from the start-up, even there is the problem that can't start, for this reason, when the condition that takes place the cold water set restart or just start, preheat the start through the inner loop, can significantly reduce the unit from the start to the required time of steady operation, eliminate because of the adverse effect of start delay to the process flow who adopts the refrigerated water, make the cooling water loop not flow through the cooling tower, only carry out the inner loop, thereby reach system normal start, quick stable purpose.
The hierarchical progressive control mode ensures that the inlet water temperature of the cooling water is always within the normal operation range of the unit and has small fluctuation. Firstly, adjusting the rotating speed of a fan of a cooling tower according to the inlet water temperature of cooling water; secondly, a bypass pipeline is arranged between a water inlet pipe and a water outlet pipe of the cooling tower, an electric regulating valve is arranged on the bypass pipeline, and when the system operates under the condition of cold climate, the electric regulating valve is subjected to proportional differential regulation according to the inlet water temperature of cooling water; finally, electric heating belts are arranged on the cooling tower water inlet horizontal pipe, the cooling tower water outlet vertical pipe and the cooling tower water inlet and outlet bypass pipe, and the work or the stop of the electric heating belts are controlled according to the outdoor temperature and the cooling water inlet temperature; through above design and control, make cooling water temperature of intaking be in the unit can normal operating range all the time and undulant less to entire system can be for the continuous stable accurate low temperature refrigerated water of temperature that provides of production technology, and shorten the unit greatly and provide the time of refrigerated water from starting to stable work, eliminate because of the refrigerated water provides not enough adverse effect to the production technology causes.
Example 3
Based on the air conditioning unit control method provided in embodiment 2 above, there is also provided in a preferred embodiment 3 of the present invention a storage medium containing computer-executable instructions for performing the air conditioning unit control method as described above when executed by a computer processor.
In the above embodiment, a cooling water unit system capable of providing chilled water with precise temperature in cold climate is provided, wherein a cooling tower water inlet and outlet bypass pipeline is arranged between a cooling tower water inlet pipeline and a cooling tower water outlet pipeline, and is used for bypassing a part of water in the cooling tower water inlet pipeline to the cooling tower water outlet pipeline, so as to prevent the cooling water return temperature of the cooling water unit from being too low under low temperature conditions, and control water flow bypassing the cooling tower water outlet pipeline through a bypass valve located on the cooling tower water inlet and outlet bypass pipeline, so as to prevent the cooling water temperature from fluctuating greatly. The unit can provide chilled water with accurate temperature under the condition of cold climate, and can be safely and stably operated for a long time, the inlet water temperature of the cooling water is always maintained within the range of normal operation of the unit, and the fluctuation is small.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (12)
1. An air conditioning assembly, comprising:
a cold water main machine (1);
a cooling tower (3);
one end of the cooling tower water inlet pipeline (2) is connected with a water outlet of the cold water main machine (1), and the other end of the cooling tower water inlet pipeline is connected with a water inlet of the cooling tower (3);
one end of the cooling tower water outlet pipeline (4) is connected with the water outlet of the cooling tower (3), and the other end of the cooling tower water outlet pipeline is connected with the water inlet of the cold water main machine (1);
one end of the cooling tower water inlet and outlet bypass pipeline (7) is connected with the cooling tower water inlet pipeline (2), and the other end of the cooling tower water inlet and outlet bypass pipeline is connected with the cooling tower water outlet pipeline (4) and is used for bypassing the water part in the cooling tower water inlet pipeline (2) to the cooling tower water outlet pipeline (4);
and the bypass valve (8) is positioned on the cooling tower water inlet and outlet bypass pipeline (7) and is used for controlling the water flow bypassing the cooling tower water outlet pipeline (4).
2. The air conditioning assembly as set forth in claim 1, further comprising:
the cooling tower water inlet switch valve (9) is positioned on the cooling tower water inlet pipeline (2) between the water inlet of the cooling tower (3) and the first connecting point; the first connecting point is a connecting point of the cooling tower water inlet and outlet bypass pipeline (7) and the cooling tower water inlet pipeline (2).
3. The air conditioning assembly as set forth in claim 2, further comprising:
the first electric heating belt (10) is positioned on the cooling tower water inlet pipeline (2) between the water inlet of the cooling tower (3) and the cooling tower water inlet switch valve (9);
the second electric heating belt (11) is positioned on the water outlet pipeline (4) of the cooling tower;
and the third electric heating belt (12) is positioned on the cooling tower water inlet and outlet bypass pipeline (7).
4. The air conditioning assembly as set forth in claim 1, further comprising:
the cooling water inlet temperature sensor (13) is positioned at the water inlet of the cold water main machine (1) and is used for detecting the cooling water inlet temperature;
an outdoor temperature sensor (14) located outside the cooling tower (3) for detecting an outdoor ambient temperature.
5. The air conditioning assembly as set forth in claim 1, further comprising:
one end of the water tank (5) is connected with the cooling tower water outlet pipeline (4), and the other end of the water tank is connected with a water inlet of the cold water main machine (1);
and the cooling water pump (6) is positioned on a pipeline between the water tank (5) and the water inlet of the cold water main machine (1).
6. An air conditioning unit control method applied to the air conditioning unit according to any one of claims 1 to 5, characterized by comprising:
detecting the running state of the air conditioning unit;
when the running state is a normal running state, detecting the water inlet temperature of the cooling water;
and controlling the operation of the air conditioning unit according to the inlet water temperature of the cooling water.
7. The method of claim 6, wherein controlling the operation of the air conditioning unit based on the cooling water inlet temperature comprises:
when the cooling water inlet temperature is continuously lower than a first preset temperature for a first preset time, controlling a fan of the cooling tower to reduce a preset rotating speed;
detecting whether the inlet water temperature of the cooling water is greater than or equal to the first preset temperature, if so, keeping the current rotating speed of the fan, and otherwise, continuously controlling the fan to reduce the preset rotating speed; and when the current rotating speed of the fan is less than the preset minimum rotating speed, controlling the fan to stop.
8. The method of claim 7, wherein controlling the operation of the air conditioning unit based on the cooling water inlet temperature further comprises:
when the cooling water inlet temperature is continuously lower than a second preset temperature for a second preset time, controlling the bypass valve to open; wherein the second preset temperature is lower than the first preset temperature; the initial opening degree of the bypass valve after the bypass valve is opened is a first preset opening degree, the maximum opening degree of the bypass valve is a second preset opening degree, and the second preset opening degree is larger than the first preset opening degree.
9. The method of claim 6, wherein when the operating condition is a normal operating condition, further comprising:
detecting the outdoor environment temperature;
and when the outdoor environment temperature is lower than a third preset temperature, starting a first electric heating belt.
10. The method of claim 6, after controlling the operation of the air conditioning unit according to the cooling water inlet temperature, further comprising:
re-detecting the inlet water temperature of the cooling water;
when the cooling water inlet temperature is less than the lowest cooling water inlet temperature and the preset temperature difference, the second electric heating belt and the third electric heating belt are controlled to be opened until the cooling water inlet temperature is greater than the lowest cooling water inlet temperature, and the change value of the cooling water inlet temperature is less than the preset change value.
11. The method of claim 6, further comprising:
when the running state is a starting-up state or a restarting state after shutdown protection, controlling a water inlet switch valve of the cooling tower to be closed, and controlling a bypass valve to be opened to the maximum opening degree;
and detecting the water inlet temperature of the cooling water, controlling the water inlet switch valve of the cooling tower to be opened and controlling the bypass valve to be closed when the water inlet temperature of the cooling water is higher than a fourth preset temperature, and then controlling the air conditioning unit to enter the normal operation state.
12. A storage medium containing computer-executable instructions for performing the air conditioning pack control method of any of claims 6 to 11 when executed by a computer processor.
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Application publication date: 20211231 |