Evaporator inlet water temperature control system

Details Evaporator inlet water temperature control system Evaporator inlet water temperature control system

1979-09-12

1981-08-11

Wayner, William E.

Refrigeration

Processes

Compressing, condensing and evaporating

62201, 62209, 62228, F25B 500, F25D 500

Patent

active

042827183

ABSTRACT:
An evaporator inlet water temperature control system for controlling the inlet water temperature of an evaporator utilized in an inverter driven centrifugal chiller. The system creates the proper chilled water set point at the evaporator outlet needed to maintain the inlet water at its set point for greater efficiency of operation. Control is accomplished by generating an electrical error signal which is a function of an inlet water set point voltage and the actual inlet water temperature. A logic signal is produced as a function of the error signal detected by the circuit and establishes a dead zone band representing a range in which the error signal is acceptable. Output of the control system is passed to the capacity control circuit of an inverter driven centrifugal compressor chiller. When the inlet water temperature reaches its set point during pull-down, the logic output of the circuit sets a flip-flop which enables transmission gates to control changes in the outlet water set point as needed to balance the load of the cooling system.

REFERENCES:
patent: 3751940 (1973-08-01), Norbeck
patent: 4060997 (1977-12-01), Shultz et al.
patent: 4112703 (1978-09-01), Kountz
patent: 4151725 (1979-05-01), Kountz et al.

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