Electric resistance heating devices – Heating devices – Combined with nonelectric heating means
Patent
1993-10-21
1994-11-22
Reynolds, Bruce A.
Electric resistance heating devices
Heating devices
Combined with nonelectric heating means
165 29, 237 2B, F24H 100
Patent
active
053676025
ABSTRACT:
A water heating system, including both a conventional water heater and an external heat source such as a heat pump, is controlled in accordance with the present invention. The water heater includes a water storage tank, an electrically resistive heating element located in the tank, and a tank-mounted thermostat which closes in response to a demand for water heating to allow electric current flow to the heating element and which opens when the demand for water heating has been satisfied, to interrupt the electric current flow to the heating element. The external heat pump includes a water pump for circulating the water between the storage tank and the heat pump, whereby water is heated by the heat pump and returned to the tank. A current sensor is provided for sensing the flow of electric current to the heating element and a temperature sensor is located external to the water storage tank for sensing the temperature of the water entering the heat pump before the water is heated thereby. When the current sensor senses a flow of electric current to the heating element, the current flow is interrupted so as to disable the heating element and the heat pump is enabled to provide the primary source of heating. The heat pump is operated until the temperature of the incoming water exceeds a predetermined set temperature.
REFERENCES:
patent: 4498622 (1985-02-01), Harnish
patent: 4540874 (1985-09-01), Shaffer, Jr. et al.
patent: 4543468 (1985-09-01), Shaffer, Jr. et al
patent: 5255338 (1993-10-01), Robinson, Jr. et al.
Jeffery John A.
Lennox Industries Inc.
McCord W. Kirk
Reynolds Bruce A.
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