Refrigeration – Automatic control – Refrigeration producer
Patent
1990-09-20
1992-03-17
Bennet, Henry A.
Refrigeration
Automatic control
Refrigeration producer
62230, 237 2B, F25B 100
Patent
active
050957155
ABSTRACT:
An integrated heat pump and hot water system provides heating or cooling of a comfort zone, as required, and also provides water heating. As a power management feature, the speed of a variable speed compressor is reduced to a predetermined fraction, e.g. 80%, of its normal operating speed, in response to a demand limit signal provided from the electric power utility during times of peak electrical load. A reference compressor speed is computed based on the current compressor speed, indoor temperature, outdoor temperature, and zero-load temperature difference. If the system is between operating cycles when the demand limit signal is received, a stored speed is used which corresponds to the compressor speed at a predetermined outdoor-indoor temperature difference. This system produces graceful reduction in comfort cooling during demand limit periods.
REFERENCES:
patent: 4656835 (1987-04-01), Kidder et al.
patent: 4727727 (1988-03-01), Reedy
patent: 4734628 (1988-03-01), Bench et al.
patent: 4738118 (1988-04-01), Kanazawa
patent: 4766734 (1988-08-01), Dudley
patent: 5036676 (1991-08-01), Dudley
Bennet Henry A.
Electric Power Research Institute Inc.
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