Refrigeration – Automatic control – Of closed system sorbent type
Patent
1979-09-10
1981-05-26
King, Lloyd L.
Refrigeration
Automatic control
Of closed system sorbent type
62148, 62476, F25B 1500
Patent
active
042690340
ABSTRACT:
An absorption refrigeration system responsive to variant load demands provides a conventional absorption unit and a control system which adjusts the operation of the unit according to the load demand. The absorption unit has an evaporator-absorber section where refrigerant is flash cooled in a near vacuum and absorbent solution absorbs the refrigerant vapor; a generator-condenser section where the solution diluted with refrigerant is heated vaporizing the refrigerant to be condensed and returned to the evaporator; a condenser fluid supply which supplies condenser fluid to the absorber and condenser for heat transfer and carries away heat dissipated therein; a heat source supply which heats the solution in the generator; and, a chilled fluid supply which supplies a chilled fluid to the evaporator for the flash cooling heat transfer and carries the cooled chilled fluid to fan coil units for refrigeration purposes. The control system has temperature sensitive probes which monitor the temperature of the chilled fluid entering and leaving the evaporator and provide signals accordingly; a differential temperature controller which receives the probe signals, compares the signals against each other and against predetermined design specifications for the absorption unit, and provides a resultant signal dependent upon the comparisons; and flow control valves which receive the resultant signal and regulate the flow of the condenser fluid, the chilled fluid, and the heating medium. Additional flow control valves responsive to the resultant signal for regulating the flow of solution to the generator and refrigerant to the evaporator are provided.
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