Refrigeration – Automatic control – Time or program actuator
Patent
1979-03-14
1981-06-02
Wayner, William E.
Refrigeration
Automatic control
Time or program actuator
62201, 62211, 62217, 62230, G05D 2332, F25B 4104
Patent
active
042703611
ABSTRACT:
An automatic chiller control is disclosed for providing a temperature sensitive load limit compressor control on a cooling water system, such as is used in buildings for air conditioning. The controller operates across at least one motor driven compressor and operates to adjust the vane inlet to a typically centrifugal compressor. Control is provided in discrete steps responsive to changes in cooling water temperature as the water typically returns from a building. The control when operated in the automatic position starts the chiller at minimum possible power consumption. Increasing load or unload of the chiller is provided in incremental steps (for example 5% of full load) at preselected time intervals (for example 10 minutes) which are typically adjustable to any other desired time span. The control seeks the required motor power output without waste of power. Provision is made where the controller is operating the chiller at less than an efficient level (for example with vanes closed) to periodically shut the chiller down for an adjustable time as required. Options of overriding manual adjustment as well as manual adjustment only are included.
REFERENCES:
patent: 2817213 (1957-12-01), Miner
patent: 3003331 (1961-10-01), Coburn et al.
patent: 3103107 (1963-09-01), Ehlke
patent: 3380262 (1968-04-01), Miner
patent: 3609989 (1971-10-01), Richardson
patent: 3618333 (1971-11-01), Pedersen et al.
patent: 4084406 (1978-04-01), Brenneman
patent: 4152902 (1979-05-01), Lush
Tanner Harry
Wayner William E.
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