Dual setpoint control for an absorption chiller
AssigneeCarrier Corporation
InventorsNeil D. Jenkins, Richard A. Kolk
Life of this patent
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Abstract
A method of controlling the capacity of an absorption chiller by regulating the heat input to a generator in response to a selected one of two system variables. The first variable involves the measured chilled water temperature leaving the system evaporator and the second involves the calculated solution concentration that is being returned to the absorber. Data relating to each variable is sent to a selector where it is processed so that the data can be used to control the heat input to the generator. The temperature data is used to control the heat input during normal chiller operation, however, the selector changes over control to the concentrate related data when the solution concentration level approaches the solution crystallization limit.
Claims9
A method of controlling the capacity of an absorption chiller that includes the steps of:
- providing a first variable by measuring the chilled water temperature leaving the evaporator of the chiller and sending the temperature data to a selector,
- providing a second variable by calculating the solution concentration being returned to the absorbent of the chiller, and sending the concentration data to said selector,
- selecting one of the variables based on the solution crystallization level and forwarding only the selected variable data to a controller for regulating the heat input to a system generator to maintain the selected variable at a desired setpoint.
Dependencies are inferred from the claim text.