Electric heating device employing PTC heating element for prehea

Details Electric heating device employing PTC heating element for prehea Electric heating device employing PTC heating element for prehea

1979-09-04

1983-02-01

Bartis, A.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

138 33, 219205, 219301, 219308, 219315, 219328, 219505, 219535, 431 11, 431 41, 431208, F02M 3112, H05B 102, H05B 314

Patent

active

043717780

ABSTRACT:
A heating device for preheating heating oil flowing through a pipe has a heat conduction body to which a plate-shaped ceramic PTC resistance heating element is connected in heat exchange-relationship. The heating element has a thickness in the range of 0.5 to 2 millimeters, a Curie temperature between 120.degree. and 220.degree. C. and a specific resistance of 430 to 5000 ohm-cm rated at a supply voltage between 110 and 220 volts such that the maximum temperature achieved by the heating element over a range of heat transfer rates is relatively constant and is determined by the resistivity and the Curie temperature of the heating element rather than by the rate of heat transfer. If designed for energization at 220 volts, the heating element has the same thickness and Curie temperature as in the first example described above, but with a specific resistance of 1700 to 20,000 ohm-cm as measured at 220 volts.

REFERENCES:
patent: 1140864 (1915-05-01), Aubery
patent: 1413681 (1922-04-01), Piggins
patent: 1423742 (1922-07-01), Silverman
patent: 2104940 (1938-01-01), Woolery
patent: 2397988 (1946-04-01), Senninger
patent: 3338476 (1967-08-01), Marcoux
patent: 3375774 (1968-04-01), Fujimura et al.
patent: 3564199 (1971-02-01), Blaha
patent: 3824328 (1974-07-01), Ting et al.
patent: 4045763 (1977-08-01), Miyamoto et al.
patent: 4177375 (1979-12-01), Meixner
patent: 4223208 (1980-09-01), Kleinschmidt et al.
patent: 4230935 (1980-10-01), Meixner
German Utility Model GM 78 11098 (Gebrauchsmuster), published Aug. 24, 1978.
German Utility Model GM 78 04316 (Gebrauchsmuster), published Nov. 11, 1978.
"Feuerungstechik", (Fuel Engineering), May 1978, pp. 13-30.

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