Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1985-02-04
1986-03-04
Tanner, Harry
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62128, F25D 2106
Patent
active
045733260
ABSTRACT:
A microcomputer based defrost control for a heat pump system that "learns" from previous defrost cycles to achieve optimum defrost control at each of a plurality of outdoor temperature ranges, even if the heat pump system operating parameters change due to system aging. At the conclusion of each defrost cycle, the control determines the differential temperature between the outdoor ambient air and the outdoor heat exchanger and compares that value to a value stored in microcomputer memory representing a previous best such post-defrost differential temperature for the same ambient air temperature range. The control then calculates a defrost differential temperature initiate value, corrected to compensate for any loss of defrost performance indicated by the current post-defrost cycle differential temperature. After a period of time during which a number of defrost cycles have occurred, the minimum post defrost differential temperature value for each ambient temperature range becomes the best performance measure of the defrost cycle for the heat pump system. The stored minimum values are reset to zero when the control and heat pump system are deenergized. When the system is again turned on, new optimum defrost initiate values are again determined over a period of time. In addition, various default conditions cause the control to initiate an extended defrost cycle. The control is programmed to alert the operator by lighting a lamp on the thermostat should such a fault condition occur.
REFERENCES:
patent: 3950962 (1976-04-01), Odashima
patent: 4104888 (1978-08-01), Reedy et al.
patent: 4373349 (1983-02-01), Mueller
patent: 4406133 (1983-09-01), Saunders et al.
Bergt Carl
Helt Robert W.
Sulfstede Louis E.
American Standard Inc.
Anderson Ronald M.
Beres William J.
Lewis Carl M.
Tanner Harry
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