Operation control system and method for a chiller cooling tower
Provided are an operation control system and an operation control method for a chiller cooling tower. The operation control system includes a water chilling unit, a first temperature sensor, a second temperature sensor, a programmable logic controller, and an artificial intelligence controller.
1. An operation control system for a chiller cooling tower, comprising a water chilling unit, a first temperature sensor, a second temperature sensor, a programmable logic controller, and an artificial intelligence controller;
wherein the water chilling unit comprises a water chiller and a water cooling tower, wherein a plurality of fans are disposed in the water cooling tower;
the first temperature sensor is configured to sense an outlet water temperature of the water cooling tower;
the second temperature sensor is configured to sense a wet-bulb temperature outside the water chilling unit;
the artificial intelligence controller is communicatively connected to the first temperature sensor and is configured to determine a temperature change value according to the outlet water temperature and a current operating frequency of the fans;
the programmable logic controller is configured to determine an operating mode of the fans according to a control output value of the programmable logic controller and a system-set output value of the operation control system, wherein the operating mode comprises a first operating mode and a second operating mode, an operating frequency of the fans in the second operating mode is higher than or equal to an operating frequency of the fans in the first operating mode, and a number of fans turned on in the second operating mode is greater than or equal to a number of fans turned on in the first operating mode; and
the programmable logic controller is communicatively connected to the first temperature sensor, the second temperature sensor, and the artificial intelligence controller separately, and the programmable logic controller is configured to determine, in the first operating mode and the second operating mode, information about an adjustment to the operating frequency according to the outlet water temperature, the wet-bulb temperature, and the temperature change value.
2. The operation control system according to claim 1 , wherein in response to determining that the control output value is less than the system-set output value, the programmable logic controller is configured to control the fans to operate in the first operating mode; and
the programmable logic controller is configured to control, in the first operating mode, the fans to operate at a first operating frequency, wherein the first operating frequency is fixed; and the programmable logic controller is further configured to control the fans among the plurality of fans to be turned on, wherein a number of the fans turned on is adjustable.
3. The operation control system according to claim 2 , wherein the programmable logic controller is configured to control N fans among the plurality of fans to be turned on, wherein N≥2, and N is an integer;
wherein time when an i-th fan is turned on is earlier than time when an (i+1)-th fan is turned on, and accumulated operating time of the i-th fan is less than accumulated operating time of the (i+1)-th fan, wherein 1≤i<N, and i is the integer.
4. The operation control system according to claim 1 , wherein in response to determining that the control output value is greater than or equal to the system-set output value, the programmable logic controller is configured to control the fans to operate in the second operating mode; and
the programmable logic controller is configured to control, in the second operating mode, the fans to operate at a second operating frequency, wherein the second operating frequency is adjustable; and the programmable logic controller is further configured to control the fans among the plurality of fans to be turned on, wherein a number of the fans turned on is fixed.
5. The operation control system according to claim 4 , wherein in response to determining that a sum of the wet-bulb temperature and the temperature change value is less than the outlet water temperature, the programmable logic controller is configured to increase the second operating frequency of the fans; and
in response to determining that the sum of the wet-bulb temperature and the temperature change value is greater than the outlet water temperature, the programmable logic controller is configured to reduce the second operating frequency of the fans.
6. The operation control system according to claim 1 , further comprising a frequency converter;
wherein an input end of the frequency converter is connected to an output end of the programmable logic controller, and an output end of the frequency converter is connected to the fans; the programmable logic controller is configured to output the information about the adjustment to the operating frequency of the fans to the frequency converter; and the frequency converter is configured to adjust the operating frequency of the fans according to the information about the adjustment and then send information about the adjusted operating frequency to the fans, so as to control the fans to operate.
7. The operation control system according to claim 6 , further comprising a human-computer interaction module which is communicatively connected to a first temperature sensing module, a second temperature sensing module, and the frequency converter separately;
wherein the human-computer interaction module is configured to display the outlet water temperature, the wet-bulb temperature, and the operating frequency.
8. An operation control method for a chiller cooling tower, the method being applied to an operation control system and comprising:
determining an operating mode of fans according to a control output value of a programmable logic controller and a system-set output value of the operation control system, wherein the operating mode comprises a first operating mode and a second operating mode, an operating frequency of the fans in the second operating mode is higher than or equal to an operating frequency of the fans in the first operating mode, and a number of fans turned on in the second operating mode is greater than or equal to a number of fans turned on in the first operating mode;
wherein the programmable logic controller receives, in the second operating mode, an outlet water temperature, a wet-bulb temperature, and a temperature change value and determines information about an adjustment to the operating frequency according to the outlet water temperature, the wet-bulb temperature, and the temperature change value, and the programmable logic controller controls the fans to operate at a second operating frequency, wherein the second operating frequency is adjustable,
wherein the operation control system comprises a water chilling unit, a first temperature sensor, a second temperature sensor, the programmable logic controller, and an artificial intelligence controller;
wherein the water chilling unit comprises a water chiller and a water cooling tower, wherein the fans are disposed in the water cooling tower;
the first temperature sensor is configured to sense the outlet water temperature of the water cooling tower;
the second temperature sensor is configured to sense the wet-bulb temperature outside the water chilling unit;
the artificial intelligence controller is communicatively connected to the first temperature sensor and is configured to determine the temperature change value according to the outlet water temperature and a current operating frequency of the fans;
the programmable logic controller is configured to determine the operating mode of the fans according to the control output value of the programmable logic controller and the system-set output value of the operation control system, wherein the operating mode comprises the first operating mode and the second operating mode, the operating frequency of the fans in the second operating mode is higher than or equal to the operating frequency of the fans in the first operating mode, and the number of fans turned on in the second operating mode is greater than or equal to a number of fans turned on in the first operating mode; and
the programmable logic controller is communicatively connected to the first temperature sensor, the second temperature sensor, and the artificial intelligence controller separately, and the programmable logic controller is configured to determine, in the first operating mode and the second operating mode, information about an adjustment to the operating frequency according to the outlet water temperature, the wet-bulb temperature, and the temperature change value.
9. The operation control method according to claim 8 , further comprising:
controlling, in the first operating mode, the fans to operate at the first operating frequency, wherein the first operating frequency is fixed; and
controlling N fans to be turned on sequentially, wherein N≥2, and N is an integer;
wherein time when an i-th fan is turned on is earlier than time when an (i+1)-th fan is turned on, and accumulated operating time of the i-th fan is less than accumulated operating time of the (i+1)-th fan, wherein 1≤i<N, and i is the integer.
10. The operation control method according to claim 8 , wherein determining the information about the adjustment to the operating frequency according to the outlet water temperature, the wet-bulb temperature, and the temperature change value comprising:
increasing the second operating frequency of the fans in response to determining that a sum of the wet-bulb temperature and the temperature change value is less than the outlet water temperature; and
reducing the second operating frequency of the fans in response to determining that the sum of the wet-bulb temperature and the temperature change value is greater than the outlet water temperature.
11. The operation control method according to claim 8 , wherein in response to determining that the control output value is less than the system-set output value, the programmable logic controller is configured to control the fans to operate in the first operating mode; and
the programmable logic controller is configured to control, in the first operating mode, the fans to operate at a first operating frequency, wherein the first operating frequency is fixed; and the programmable logic controller is further configured to control the fans among the plurality of fans to be turned on, wherein a number of the fans turned on is adjustable.
12. The operation control method according to claim 11 , wherein the programmable logic controller is configured to control N fans among the plurality of fans to be turned on, wherein N≥2, and N is an integer;
wherein time when an i-th fan is turned on is earlier than time when an (i+1)-th fan is turned on, and accumulated operating time of the i-th fan is less than accumulated operating time of the (i+1)-th fan, wherein 1≤i<N, and i is the integer.
13. The operation control method according to claim 8 , wherein in response to determining that the control output value is greater than or equal to the system-set output value, the programmable logic controller is configured to control the fans to operate in the second operating mode; and
the programmable logic controller is configured to control, in the second operating mode, the fans to operate at a second operating frequency, wherein the second operating frequency is adjustable; and the programmable logic controller is further configured to control the fans among the plurality of fans to be turned on, wherein a number of the fans turned on is fixed.
14. The operation control method according to claim 13 , wherein in response to determining that a sum of the wet-bulb temperature and the temperature change value is less than the outlet water temperature, the programmable logic controller is configured to increase the second operating frequency of the fans; and
in response to determining that the sum of the wet-bulb temperature and the temperature change value is greater than the outlet water temperature, the programmable logic controller is configured to reduce the second operating frequency of the fans.
15. The operation control method according to claim 8 , further comprising a frequency converter;
wherein an input end of the frequency converter is connected to an output end of the programmable logic controller, and an output end of the frequency converter is connected to the fans; the programmable logic controller is configured to output the information about the adjustment to the operating frequency of the fans to the frequency converter; and the frequency converter is configured to adjust the operating frequency of the fans according to the information about the adjustment and then send information about the adjusted operating frequency to the fans, so as to control the fans to operate.
16. The operation control method according to claim 15 , further comprising a human-computer interaction module which is communicatively connected to a first temperature sensing module, a second temperature sensing module, and the frequency converter separately;
wherein the human-computer interaction module is configured to display the outlet water temperature, the wet-bulb temperature, and the operating frequency.