Disclosure of Invention
Accordingly, it is necessary to provide an air conditioning and cooling water system, an air conditioning system, and a control method for the air conditioning and cooling water system, in order to solve the problem of energy waste caused by the fact that the outlet water temperature of the cooling water cannot be reduced synchronously with the wet bulb temperature.
The invention provides an air conditioner cooling water system, which comprises a cooling tower, a cooling water outlet pipe and a cooling water return pipe, wherein the cooling water outlet pipe and the cooling water return pipe are respectively communicated with the cooling tower and are used for exchanging heat with a condenser by utilizing cooling water in the cooling tower;
the auxiliary heat exchanger is used for cooling the inlet air of the cooling tower;
the auxiliary switch is used for controlling the working state of the auxiliary heat exchanger.
In one embodiment, the cooling water system further comprises a chilled water branch water inlet pipe and a chilled water branch water outlet pipe;
the two ends of the chilled water branch inlet pipe are communicated with a chilled water outlet of the evaporator and a water inlet of the auxiliary heat exchanger respectively, and the chilled water branch outlet pipe is communicated with a chilled water return port of the evaporator and a water outlet of the auxiliary heat exchanger respectively.
In one embodiment, the auxiliary switch is disposed on the chilled water branch water inlet pipe or the chilled water branch water outlet pipe.
In one embodiment, the cooling water system includes a cooling water outlet temperature sensor for determining a cooling water outlet temperature of the cooling tower.
The invention also provides an air conditioning system, wherein the air conditioning system comprises a condenser, an evaporator, a refrigeration pipeline, a cooling tower, a cooling water outlet pipe, a cooling water return pipe, an auxiliary heat exchanger and an auxiliary switch;
the condenser and the evaporator are connected through the refrigeration pipeline to form a refrigerant loop, and a compressor and a throttling device are arranged in the refrigerant loop;
the cooling water outlet pipe and the cooling water return pipe are respectively communicated with the cooling tower and are used for exchanging heat with the condenser by using cooling water in the cooling tower;
the auxiliary heat exchanger is used for cooling the inlet air of the cooling tower;
the auxiliary switch is used for controlling the working state of the auxiliary heat exchanger.
In one embodiment, the air conditioning system further comprises a chilled water branch water inlet pipe and a chilled water branch water outlet pipe;
the two ends of the chilled water branch inlet pipe are communicated with a chilled water outlet of the evaporator and a water inlet of the auxiliary heat exchanger respectively, and the chilled water branch outlet pipe is communicated with a chilled water return port of the evaporator and a water outlet of the auxiliary heat exchanger respectively.
In one embodiment thereof, the air conditioning system comprises a cooling water outlet water temperature sensor and a wet bulb temperature sensor;
the cooling water outlet temperature sensor is used for measuring the cooling water outlet temperature of the cooling tower;
the wet bulb temperature sensor is used for measuring the outdoor wet bulb temperature of the air conditioning system.
The invention also provides a control method of the air-conditioning cooling water system, which is characterized by comprising the following steps:
comparing the outdoor wet bulb temperature with a first preset temperature;
and when the outdoor wet bulb temperature is lower than or equal to the first preset temperature, controlling the auxiliary switch to be opened or increasing the opening degree.
In one embodiment, the control method further includes the steps of:
comparing the outdoor wet bulb temperature with a second preset temperature;
when the outdoor wet bulb temperature is higher than or equal to the second preset temperature, controlling the auxiliary switch to be opened or increasing the opening degree;
wherein the first preset temperature is lower than the second preset temperature.
In one embodiment, the control method further includes the steps of:
and when the outdoor wet bulb temperature is higher than the first preset temperature and lower than the second preset temperature, controlling the auxiliary switch to be turned off or reducing the opening degree.
In one embodiment, the first preset temperature is lower than the second preset temperature by 3-10 ℃.
The air conditioner cooling water system is provided with the auxiliary heat exchanger, and the auxiliary heat exchanger is used for cooling the inlet air of the cooling tower, so that the outlet water temperature of the cooling water of the cooling tower is reduced. When the outdoor wet bulb temperature is low, the cooling water outlet temperature of the cooling tower and the outdoor wet bulb temperature can be synchronously reduced or further reduced to be lower than the outdoor wet bulb temperature, the energy efficiency of the air-conditioning cooling water system is improved, and the energy waste is avoided.
Furthermore, when the outdoor wet bulb temperature is high, the auxiliary heat exchanger can reduce the outlet water temperature of the cooling water of the cooling tower, and the phenomenon of high-pressure protection or surging of a cooling water system due to overhigh outlet water temperature of the cooling water is avoided.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the air-conditioning cooling water system, the air-conditioning system and the control method of the air-conditioning cooling water system of the present invention are further described in detail by the following embodiments with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, an air-conditioning cooling water system according to an embodiment of the present invention includes a cooling tower 200, a cooling water outlet pipe 210, a cooling water return pipe 220, an auxiliary heat exchanger 130, and an auxiliary switch 140, where arrows indicate an air inlet direction and an air outlet direction of the cooling tower 200.
One end of the cooling water outlet pipe 210 is communicated with a cooling water outlet of the cooling tower 200, and the other end is connected with a condenser 300 of an air conditioning system. One end of the cooling water return pipe 220 is communicated with a cooling water return port of the cooling tower 200, and the other end is connected with a condenser 300 of an air conditioning system. The cooling water outlet pipe 210 and the cooling water return pipe 220 exchange heat with the refrigerant in the condenser using the cooling water prepared by the cooling tower 200.
The cooling tower 200 and the condenser 300 form a cooling water loop through a cooling water outlet pipe 210 and a cooling water return pipe 220, and optionally, a cooling pump 230 and a cooling water valve 240 are disposed on the cooling water loop. The cooling pump 230 is used to power the circulation of cooling water in the cooling water circuit. The cooling water valve 240 is used to control the flow of cooling water in the cooling water circuit. Further, the cooling pump 230 may be provided on the cooling water outlet pipe 210. Further, two cooling water valves 240 are provided, respectively on the cooling water outlet pipe 210 and the cooling water return pipe 220 connected to the water outlet and the water inlet of the cooling tower 200. Alternatively, the cooling water valve 240 may be a solenoid valve.
The auxiliary heat exchanger 130 is used for cooling the inlet air of the cooling tower 200, that is, the inlet air of the cooling tower 200 is first cooled by the auxiliary heat exchanger 130 and then enters the cooling tower 200 to cool the water in the cooling tower 200. And the auxiliary heat exchanger is utilized to cool the inlet air of the cooling tower, so that the outlet water temperature of the cooling water of the cooling tower is reduced. When the outdoor wet bulb temperature is low, the cooling water outlet temperature of the cooling tower and the outdoor wet bulb temperature can be synchronously reduced or further reduced to be lower than the outdoor wet bulb temperature, the energy efficiency of the air-conditioning cooling water system is improved, and the energy waste is avoided. Furthermore, when the outdoor wet bulb temperature is high, the auxiliary heat exchanger can reduce the outlet water temperature of the cooling water of the cooling tower, and the phenomenon of high-pressure protection or surging of a cooling water system due to overhigh outlet water temperature of the cooling water is avoided.
For the conventional cooling tower 200, the lower limit of the cooling water outlet temperature is the outdoor wet bulb temperature. The invention cools the inlet air of the cooling tower 200 through the auxiliary heat exchanger 130, can make the lower limit value of the outlet water temperature of the cooling water close to the outdoor dew point temperature, even lower than the outdoor dew point temperature, and greatly reduces the lower limit value of the outlet water temperature of the cooling water.
When the outdoor wet bulb temperature is lower, the cooling water outlet temperature of the cooling tower 200 and the outdoor wet bulb temperature can be synchronously reduced, even lower than the outdoor wet bulb temperature by 3-5 ℃, so that the energy efficiency of an air-conditioning cooling water system is greatly improved, and generally can be improved by 10-15%.
When the outdoor wet bulb temperature is higher, the cooling water outlet temperature of the cooling tower 200 can be reduced, and the phenomenon that the cooling water outlet temperature is too high and the cooling water system has high-pressure protection or surge due to the fact that the cooling capacity of the cooling tower 200 is insufficient is avoided.
Optionally, the auxiliary heat exchanger 130 is disposed at an air intake of the cooling tower 200.
Alternatively, the auxiliary heat exchanger 130 may be a wind-water heat exchanger.
The auxiliary switch 140 is used to control the operating state of the auxiliary heat exchanger 130. Alternatively, the auxiliary switch 140 may control the auxiliary heat exchanger 130 to start or stop operating, or may control the increase or decrease of the operating efficiency of the auxiliary heat exchanger 130.
As an alternative embodiment, the cooling water system is further provided with a chilled water branch inlet pipe 110 and a chilled water branch outlet pipe 120. Two ends of the chilled water branch inlet pipe 110 are respectively communicated with a chilled water outlet of the evaporator 300 of the air conditioning system and a water inlet of the auxiliary heat exchanger 130, and the chilled water branch outlet pipe 120 is respectively communicated with a chilled water return port of the evaporator 300 of the air conditioning system and a water outlet of the auxiliary heat exchanger 130. Part of the chilled water of the evaporator 300 is introduced into the auxiliary heat exchanger 130 by using the chilled water branch inlet pipe 110 and the chilled water branch outlet pipe 120, and the auxiliary heat exchanger 130 cools the inlet air of the cooling tower 200 by using the chilled water.
As an alternative embodiment, the auxiliary switch 140 is disposed on the chilled water branch inlet pipe 110 or the chilled water branch outlet pipe 120. The auxiliary switch 140 can control the flow rate of the chilled water into the auxiliary heat exchanger and whether the chilled water is introduced. Alternatively, the auxiliary switch 140 may be a solenoid valve.
The auxiliary switch 140 can control the on/off of the chilled water branch inlet pipe 110 or the chilled water branch outlet pipe 120 to control whether the chilled water can enter the auxiliary heat exchanger 130, thereby adjusting the working state of the auxiliary heat exchanger 130.
For example, when the auxiliary switch 140 is turned on, a part of the chilled water prepared by the evaporator of the air conditioning system enters the auxiliary heat exchanger 130, and the chilled water is used to cool the inlet air of the cooling tower 200, so as to perform auxiliary cooling on the cooling tower 200, and the outlet water temperature of the cooling water can be close to the outdoor dew point temperature. Generally, the outdoor dew point temperature is 3 ℃ to 5 ℃ lower than the outdoor wet bulb temperature.
For another example, when the outdoor wet bulb temperature is low, the auxiliary switch 140 is turned on, so that part of the chilled water enters the auxiliary heat exchanger 130 to perform auxiliary cooling and cooling on the cooling tower 200, and the outlet water temperature of the cooling water can be synchronously reduced along with the outdoor wet bulb temperature, even lower than the outdoor wet bulb temperature.
For another example, when the outdoor wet bulb temperature is high, the auxiliary switch 140 is turned on, so that part of the chilled water enters the auxiliary heat exchanger 130 to perform auxiliary cooling and cooling on the cooling tower 200, thereby further reducing the outlet water temperature of the cooling water, and avoiding the phenomenon of high-pressure protection or surge of the cooling water system due to the over-high outlet water temperature caused by insufficient cooling capacity of the cooling tower 200.
Further, the auxiliary switch 140 controls the flow rate of the chilled water entering the auxiliary heat exchanger 130, so as to adjust the cooling degree of the auxiliary heat exchanger 130 to the inlet air of the cooling tower 200, and further regulate and control the outlet water temperature of the cooling water.
As an alternative embodiment, the auxiliary heat exchanger 130 may be one or more. When the auxiliary heat exchanger 130 is plural, the plural auxiliary heat exchangers 130 may be arranged in parallel.
As an alternative embodiment, the cooling water system is further provided with a cooling water outlet temperature sensor, and the cooling water outlet temperature sensor is used for measuring the cooling water outlet temperature of the cooling tower 200.
Referring to fig. 1, an air conditioning system according to an embodiment of the present invention includes a condenser 300, an evaporator 400, a refrigeration pipeline, a cooling tower 200, a cooling water outlet pipe 210, a cooling water return pipe 220, an auxiliary heat exchanger 130, and an auxiliary switch 140.
One end of the cooling water outlet pipe 210 is communicated with a cooling water outlet of the cooling tower 200, and the other end is connected with the condenser 300. One end of the cooling water return pipe 220 is communicated with a cooling water return port of the cooling tower 200, and the other end is connected with the condenser 300. The cooling water outlet pipe 210 and the cooling water return pipe 220 exchange heat with the refrigerant in the condenser using the cooling water prepared by the cooling tower 200.
As an alternative embodiment, the air conditioning system may have a plurality of cooling towers 200, and a cooling water outlet pipe 210 and a cooling water return pipe 220 connected to the cooling towers. Based on the same concept, the plurality of cooling towers 200 are respectively provided with the auxiliary heat exchangers 130.
Alternatively, the plurality of cooling towers 200 are connected to the condenser 300 through the cooling water outlet pipe 210 and the cooling water return pipe 220, respectively, and a valve is disposed on a pipe communicating with an inlet of the condenser 300 to control a flow rate of the cooling water entering the condenser 300.
The cooling tower 200 and the condenser 300 form a cooling water loop through a cooling water outlet pipe 210 and a cooling water return pipe 220, and optionally, a cooling pump 230 and a cooling water valve 240 are disposed on the cooling water loop. The cooling pump 230 is used to power the circulation of cooling water in the cooling water circuit. The cooling water valve 240 is used to control the flow of cooling water in the cooling water circuit. Further, the cooling pump 230 may be provided on the cooling water outlet pipe 210. Further, two cooling water valves 240 are provided, respectively on the cooling water outlet pipe 210 and the cooling water return pipe 220. Alternatively, the cooling water valve 240 may be a solenoid valve.
The auxiliary heat exchanger 130 is used for cooling the inlet air of the cooling tower 200, that is, the inlet air of the cooling tower 200 is first cooled by the auxiliary heat exchanger 130 and then enters the cooling tower 200 to cool the water in the cooling tower 200. And the auxiliary heat exchanger is utilized to cool the inlet air of the cooling tower, so that the outlet water temperature of the cooling water of the cooling tower is reduced.
Optionally, the auxiliary heat exchanger 130 is disposed at an air intake of the cooling tower 200.
Alternatively, the auxiliary heat exchanger 130 may be a wind-water heat exchanger.
The auxiliary switch 140 is used to control the operating state of the auxiliary heat exchanger 130. Alternatively, the auxiliary switch 140 may control the auxiliary heat exchanger 130 to start or stop operating, or may control the increase or decrease of the operating efficiency of the auxiliary heat exchanger 130. Optionally, the evaporator 400 is provided with a chilled water outlet pipe 410 and a chilled water return pipe 420, the evaporator 400 forms a chilled water loop with other refrigeration terminals of the air conditioning system through the chilled water outlet pipe 410, the chilled water return pipe 420, and the chilled water loop is provided with a refrigeration pump 430 and a chilled water valve 440. The chilled pump 430 is used to power the circulation of chilled water through the chilled water loop. The chilled water valve 440 is used to control the flow of chilled water in the chilled water loop.
For example, an indoor unit is connected to the chilled water circuit. Alternatively, the number of indoor units may be one or more.
Alternatively, the freezing pump 430 is provided on the chilled water return pipe 420.
Alternatively, the chilled water valve 440 is provided on the chilled water outlet pipe 410 or the chilled water return pipe 420. Alternatively, the chilled water valve 440 may be a solenoid valve. Optionally, a regulating valve 450 is further disposed on the chilled water circuit, and the regulating valve 450 is used for regulating distribution of chilled water in the chilled water circuit in the indoor unit.
The condenser 300 and the evaporator 400 are connected by a refrigeration line to form a refrigerant circuit, and a compressor 310 and a throttle device 320 are provided in the refrigerant circuit.
As an alternative embodiment, the air conditioning system is further provided with a chilled water branch inlet pipe 110 and a chilled water branch outlet pipe 120. Both ends of the chilled water branch inlet pipe 110 are respectively communicated with a chilled water outlet of the evaporator 300 and a water inlet of the auxiliary heat exchanger 130, and the chilled water branch outlet pipe 120 is respectively communicated with a chilled water return port of the evaporator 300 and a water outlet of the auxiliary heat exchanger 130. Thereby forming a chilled water branch loop which is sequentially connected by the evaporator 400, the chilled water branch inlet pipe 110, the auxiliary heat exchanger 130, the chilled water branch outlet pipe 120 and the evaporator 400. Part of the chilled water of the evaporator 300 is introduced into the auxiliary heat exchanger 130 by using the chilled water branch inlet pipe 110 and the chilled water branch outlet pipe 120, and the auxiliary heat exchanger 130 cools the inlet air of the cooling tower 200 by using the chilled water.
Alternatively, the chilled water branch inlet pipe 110 is communicated with a chilled water outlet of the evaporator 400 through a chilled water outlet pipe 410, and the chilled water branch outlet pipe 120 is communicated with a chilled water return port of the evaporator 400 through a chilled water return pipe 420.
As an alternative embodiment, the auxiliary switch 140 is disposed on the chilled water branch inlet pipe 110 or the chilled water branch outlet pipe 120. The auxiliary switch 140 can control the flow rate of the chilled water into the auxiliary heat exchanger and whether the chilled water is introduced. Alternatively, the auxiliary switch 140 may be a solenoid valve.
The auxiliary switch 140 can control the on/off of the chilled water branch inlet pipe 110 or the chilled water branch outlet pipe 120 to control whether the chilled water can enter the auxiliary heat exchanger 130, thereby adjusting the working state of the auxiliary heat exchanger 130.
For example, when the auxiliary switch 140 is turned on, a part of the chilled water prepared by the evaporator of the air conditioning system enters the auxiliary heat exchanger 130, and the chilled water is used to cool the inlet air of the cooling tower 200, so as to perform auxiliary cooling on the cooling tower 200, and the outlet water temperature of the cooling water can be close to the outdoor dew point temperature. Generally, the outdoor dew point temperature is 3 ℃ to 5 ℃ lower than the outdoor wet bulb temperature.
For another example, when the outdoor wet bulb temperature is low, the auxiliary switch 140 is turned on, so that part of the chilled water enters the auxiliary heat exchanger 130 to perform auxiliary cooling and cooling on the cooling tower 200, and the outlet water temperature of the cooling water can be synchronously reduced along with the outdoor wet bulb temperature, even lower than the outdoor wet bulb temperature.
For another example, when the outdoor wet bulb temperature is high, the auxiliary switch 140 is turned on, so that part of the chilled water enters the auxiliary heat exchanger 130 to perform auxiliary cooling and cooling on the cooling tower 200, thereby further reducing the outlet water temperature of the cooling water, and avoiding the phenomenon of high-pressure protection or surge of the cooling water system due to the over-high outlet water temperature caused by insufficient cooling capacity of the cooling tower 200.
Further, the auxiliary switch 140 controls the flow rate of the chilled water entering the auxiliary heat exchanger 130, so as to adjust the cooling degree of the auxiliary heat exchanger 130 to the inlet air of the cooling tower 200, and further regulate and control the outlet water temperature of the cooling water.
As an alternative embodiment, the auxiliary heat exchanger 130 may be one or more. When the auxiliary heat exchanger 130 is plural, the plural auxiliary heat exchangers 130 may be arranged in parallel.
As an optional implementation manner, the air conditioning system is further provided with a cooling water outlet water temperature low sensor and a wet bulb temperature sensor, wherein the cooling water outlet water temperature sensor is used for measuring the cooling water outlet water temperature of the cooling tower 200; the wet bulb temperature sensor is used for measuring the outdoor wet bulb temperature of the air conditioning system.
The control method of the air conditioner cooling water system provided by the embodiment of the invention comprises the following steps:
comparing the outdoor wet bulb temperature with a first preset temperature;
when the outdoor wet bulb temperature is lower than or equal to the first preset temperature, the auxiliary switch 140 is controlled to be opened or increased in opening degree.
The opening degree is opened or increased by controlling the auxiliary switch 140, the auxiliary heat exchanger 130 can be started to cool the inlet air of the cooling tower 200, so that the auxiliary cooling tower 200 cools the cooling water in the cooling tower 200, and the outlet water temperature of the cooling tower 200 can be reduced. The outlet water temperature of the cooling water can be synchronously reduced along with the outdoor wet bulb temperature, even lower than the outdoor wet bulb temperature, and the cooling energy efficiency of the air-conditioning cooling water system is improved.
When the auxiliary heat exchanger 130 is communicated with the evaporator 300 of the air conditioning system through the chilled water branch inlet pipe 110 and the chilled water branch outlet pipe 120, the inlet air of the cooling tower 200 can be cooled by the introduced chilled water. Although the cooling capacity of the chilled water (generally, the cooling capacity of the chilled water is less than 5%) needs to be introduced to cool the inlet air of the cooling tower 200, the energy efficiency of the air-conditioning cooling water system can be improved by 10% -15%, and the purposes of saving energy and improving the energy efficiency can be achieved obviously.
As an optional implementation manner, the control method of the air-conditioning cooling water system further includes the following steps:
comparing the outdoor wet bulb temperature with a second preset temperature;
when the outdoor wet bulb temperature is higher than or equal to a second preset temperature, controlling the auxiliary switch 140 to be opened or increased in opening degree; wherein the first preset temperature is lower than the second preset temperature.
The opening degree is opened or increased by controlling the auxiliary switch 140, the auxiliary heat exchanger 130 can be started to cool the inlet air of the cooling tower 200, so that the auxiliary cooling tower 200 cools the cooling water in the cooling tower 200, the outlet water temperature of the cooling tower 200 can be further reduced, and the phenomenon that the outlet water temperature of the cooling water is too high and the cooling water system has high-pressure protection or surge due to insufficient cooling capacity of the cooling tower 200 is avoided.
As an optional implementation manner, the control method of the air-conditioning cooling water system further includes the following steps:
when the outdoor wet bulb temperature is higher than the first preset temperature and lower than the second preset temperature, the auxiliary switch 140 is controlled to be turned off or reduced in opening degree.
As an optional implementation mode, the first preset temperature is lower than the second preset temperature by 3-10 ℃. Optionally, the first preset temperature is 25 ℃ and the second preset temperature is 30 ℃.
Namely, when the outdoor wet bulb temperature is lower than or equal to 25 ℃, the auxiliary switch 140 is controlled to be opened or the opening degree is increased, and then the inlet air of the cooling tower 200 is cooled or enhanced to be cooled, so that the outlet water temperature of the cooling water is further reduced, and the purpose of improving the energy efficiency of the air-conditioning cooling water system is achieved.
When the outdoor wet bulb temperature is higher than or equal to 30 ℃, the auxiliary switch 140 is controlled to be opened or the opening degree is increased, and then the inlet air of the cooling tower 200 is cooled or enhanced to be cooled, so that the outlet water temperature of the cooling water is further reduced, the purpose of preventing the outlet water temperature of the cooling water from being too high is achieved, and the high-pressure protection or surging phenomenon of a cooling water system is avoided.
When the outdoor wet bulb temperature is higher than 25 ℃ and lower than 30 ℃, that is, the outdoor wet bulb temperature is between the first preset temperature and the second preset temperature, the auxiliary switch 140 is controlled to be turned off or reduced in opening degree. In this case, the cooling tower can achieve optimum energy efficiency.
The air conditioning system control method of an embodiment of the invention comprises the following steps:
comparing the outdoor wet bulb temperature with a first preset temperature;
when the outdoor wet bulb temperature is lower than or equal to the first preset temperature, the auxiliary switch 140 is controlled to be opened or increased in opening degree.
The opening degree is opened or increased by controlling the auxiliary switch 140, the auxiliary heat exchanger 130 can be started to cool the inlet air of the cooling tower 200, so that the auxiliary cooling tower 200 cools the cooling water in the cooling tower 200, and the outlet water temperature of the cooling tower 200 can be reduced. The outlet water temperature of the cooling water can be synchronously reduced along with the outdoor wet bulb temperature, even lower than the outdoor wet bulb temperature, and the cooling energy efficiency of the air conditioning system is improved.
When the auxiliary heat exchanger 130 is communicated with the evaporator 300 of the air conditioning system through the chilled water branch inlet pipe 110 and the chilled water branch outlet pipe 120, the inlet air of the cooling tower 200 can be cooled by the introduced chilled water. Although the cooling capacity of the chilled water (generally, the cooling capacity of the chilled water is less than 5%) needs to be introduced to cool the inlet air of the cooling tower 200, the energy efficiency of the air conditioning system can be improved by 10% -15%, and the purposes of saving energy and improving the energy efficiency can be achieved obviously.
As an optional implementation manner, the air conditioning system control method further includes the following steps:
comparing the outdoor wet bulb temperature with a second preset temperature;
when the outdoor wet bulb temperature is higher than or equal to a second preset temperature, controlling the auxiliary switch 140 to be opened or increased in opening degree; wherein the first preset temperature is lower than the second preset temperature.
The opening degree is opened or increased by controlling the auxiliary switch 140, the auxiliary heat exchanger 130 can be started to cool the inlet air of the cooling tower 200, so that the auxiliary cooling tower 200 cools the cooling water in the cooling tower 200, the outlet water temperature of the cooling tower 200 can be further reduced, and the phenomenon that the outlet water temperature of the cooling water is too high and the cooling water system of the air conditioning system has high-pressure protection or surge due to insufficient cooling capacity of the cooling tower 200 is avoided.
As an optional implementation manner, the air conditioning system control method further includes the following steps:
when the outdoor wet bulb temperature is higher than the first preset temperature and lower than the second preset temperature, the auxiliary switch 140 is controlled to be turned off or reduced in opening degree.
As an alternative, the first preset temperature is 5 ℃ lower than the second preset temperature. Optionally, the first preset temperature is 25 ℃ and the second preset temperature is 30 ℃.
Namely, when the outdoor wet bulb temperature is lower than or equal to 25 ℃, the auxiliary switch 140 is controlled to be opened or the opening degree is increased, and then the inlet air of the cooling tower 200 is cooled or enhanced to be cooled, so that the outlet water temperature of the cooling water is further reduced, and the purpose of improving the energy efficiency of the air conditioning system is achieved.
When the outdoor wet bulb temperature is higher than or equal to 30 ℃, the auxiliary switch 140 is controlled to be opened or the opening degree is increased, and then the inlet air of the cooling tower 200 is cooled or enhanced to be cooled, so that the outlet water temperature of the cooling water is further reduced, the purpose of preventing the outlet water temperature of the cooling water from being too high is achieved, and the high-pressure protection or surge phenomenon of a cooling water system of an air conditioning system is avoided.
When the outdoor wet bulb temperature is higher than 25 ℃ and lower than 30 ℃, that is, the outdoor wet bulb temperature is between the first preset temperature and the second preset temperature, the auxiliary switch 140 is controlled to be turned off or reduced in opening degree. In this case, the cooling tower can achieve optimum energy efficiency.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.