Device and method for optimization of chilled water plant system operation
First Claim
1. A demand flow device configured to interface with an existing chilled water plant controller to manage performance of one of a plurality of chilled water plant subsystems with respect to remaining subsystems of the plurality of chilled water plant subsystems over a range of load conditions, the demand flow device comprising:
- a communication device configured to receive sensor data associated with the one of the chilled water plant subsystems, wherein the sensor data measures operational variables of the chilled water plant;
a demand flow controller in communication with the communication device, the demand flow controller configured to utilize the received sensor data to;
determine an optimal pressure setpoint as a function of a chilled water delta T,control a chilled water flow rate through the one of the chilled water plant subsystems as a function of the optimal pressure setpoint and the chilled water delta T; and
adjust, via the chilled water plant controller, the optimal pressure setpoint, in response to one or more detected triggering events, to perform a critical zone reset of the chilled water delta T, wherein the optimal pressure setpoint is determined as a function of a measured pressure differential, a ratio of a measured delta T to a design delta T and a site-specific exponent.
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Abstract
A demand flow device configured to interface with a chilled water plant controller to optimize performance of one or more chilled water plant components over a range of demand conditions is disclosed. The demand flow device includes a communication device configured to receive sensor data associated with the one or more chilled water plant components, wherein the sensor data measures operational variables of the chilled water plant. The demand flow device further includes a demand flow controller in communication with the communication device. The demand flow controller is configured to utilize the received sensor data to: determine an optimal pressure setpoint as a function of a desired chilled water delta T; control a chilled water flow rate through the one or more chiller water plant components as a function of the optimal pressure setpoint and the desired chilled water delta T; and adjust, via the chilled water plant controller, the optimal pressure setpoint, in response to one or more detected triggering events, to perform a critical zone reset of the desired chilled water delta T.
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Citations
25 Claims
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1. A demand flow device configured to interface with an existing chilled water plant controller to manage performance of one of a plurality of chilled water plant subsystems with respect to remaining subsystems of the plurality of chilled water plant subsystems over a range of load conditions, the demand flow device comprising:
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a communication device configured to receive sensor data associated with the one of the chilled water plant subsystems, wherein the sensor data measures operational variables of the chilled water plant; a demand flow controller in communication with the communication device, the demand flow controller configured to utilize the received sensor data to; determine an optimal pressure setpoint as a function of a chilled water delta T, control a chilled water flow rate through the one of the chilled water plant subsystems as a function of the optimal pressure setpoint and the chilled water delta T; and adjust, via the chilled water plant controller, the optimal pressure setpoint, in response to one or more detected triggering events, to perform a critical zone reset of the chilled water delta T, wherein the optimal pressure setpoint is determined as a function of a measured pressure differential, a ratio of a measured delta T to a design delta T and a site-specific exponent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 25)
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10. A demand flow control system for the implementation of variable pressure control logic in an existing chilled water plant controller to synchronize the performance of one or more chilled water plant components over a range of demand conditions, the demand flow control system comprising:
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a demand flow controller in communication with the existing chilled water plant controller, the demand flow controller configured to;
receive sensor data from one or more chilled water plant components coupled to the existing chilled water plan controller;determine an optimal pressure setpoint as a function of a desired chilled water delta T and the received sensor data for each of the one or more chilled water plan components, wherein the optimal pressure setpoint is determined iteratively for each of the one or more chilled water plant components;
communicate the optimal pressure setpoint to the existing chilled water plant controller; and
control, via the existing chilled water plant controller, a chilled water flow rate through each of the one or more chilled water plant components as a function of the optimal pressure setpoint and the desired chilled water delta T;
wherein the optimal pressure setpoint is determined as a function of a measured pressure differential, a ratio of a measured delta T to a design delta T and a site-specific exponent. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method of demand flow control utilizing variable pressure control logic to manage the performance of one or more chilled water plant components over a range of demand conditions operable in an existing chilled water plant, the method of demand flow control comprising:
- sensing a chilled water entrance temperature and a chilled water exit
temperature at one or more components of the chilled water plant;
communicating the sensed chilled water entrance temperature and thesensed chilled water exit temperature to a demand flow controller;
calculating an optimal pressure setpoint at the demand flow controller,wherein the optimal pressure setpoint is calculated as a function of a desired chilled water delta T and the sensed chilled water entrance temperature and the sensed chilled water exit temperature to a demand flow controller;
communicating the optimal pressure setpoint to an existing chilled water plantcontroller; and
controlling a chilled water flow rate through the one or more components of the chilled water plant as a function of the communicated optimal pressure setpoint;
wherein the optimal pressure setpoint is determined as a function of a measured pressure differential, a ratio of a measured delta T to a design delta T and a site-specific exponent. - View Dependent Claims (19, 20, 21, 22, 23, 24)
- sensing a chilled water entrance temperature and a chilled water exit
Specification