Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1984-10-17
1987-01-20
Bartis, A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219298, 219306, 219309, 219328, 219330, 219484, 219486, 219497, H05B 102, F24H 110
Patent
active
046381473
ABSTRACT:
A through-flow electric water heater has a cannister through which water to be heated flows and in which are disposed a first heating means comprising a plurality of electric heating elements and second heating means comprising at least one electric heating element. A control unit comprising a microprocessor receives a first input signal from a flow sensor and a temperature sensor which sense, respectively, the flow rate and temperature of the water flowing into the cannister and switches the plurality of heating elements of the first heating means on and off in different combination to achieve different heating levels and adjusts the level of heat dissipated by burst firing the at least one heating element of the second heating means to achieve a desired total heating level. A second temperature sensor is provided at the water outlet of the cannister to provide a second input to the control unit to adjust the total heat dissipated by the first and second heating means in response to the first and second inputs to maintain the temperature of the outflowing water constant. The heating elements are each switched on and off by its own solid state switching device (triac) mounted in thermal contact with the cannister to dissipate heat created by operation of the switching device to the water flowing through the cannister. A control panel enables the user to selectively adjust the water flow rate and the outflowing water temperature.
REFERENCES:
patent: 3261963 (1966-07-01), Weinstein
patent: 4167663 (1979-09-01), Granzow et al.
patent: 4337388 (1982-06-01), July
"Instant Hot Water Flows from Cold-Water Pipe", Popular Science, Jul. 1961, pp. 44, 45, 46 and 182.
Dytch Anthony
Keatley Andrew
Wright William
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