Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1981-10-02
1983-12-13
Paschall, M. H.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219493, 219328, 219365, 237 8A, 237 59, 126101, H05B 102, F24H 700
Patent
active
044206771
ABSTRACT:
A heating system comprising a closed conduit containing a liquid which is continuously circulated through the conduit by a pump. An electrical resistance heating unit serves to heat the liquid in the conduit and heat is transferred from the liquid through a heat exchanger to a medium to be heated. A proportional timer is operably connected in the electrical circuit with the heating unit. The timer has a cycle of fixed duration composed of an "on" interval and an "off" interval, with the duration of the "on" interval being variable within the cycle. A temperature sensor senses the temperature of the liquid in the conduit and if the temperture falls below a set value, the sensor acts to operate the timer and energize the heating unit. A second temperature sensor acts to adjust the "on" interval of the timing cycle in proportion to the deviation of the liquid temperature from the temperature setting.
REFERENCES:
patent: 1906144 (1933-04-01), Evans
patent: 3227275 (1966-10-01), Brusven
patent: 3375347 (1968-03-01), Seney
patent: 3523182 (1970-08-01), Phillips et al.
patent: 3894213 (1975-07-01), Agarwala
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