Controllable heating means for small masses, particularly the ex

Details Controllable heating means for small masses, particularly the ex Controllable heating means for small masses, particularly the ex

1978-11-01

1981-02-03

Wayner, William E.

Automatic temperature and humidity regulation

Motors

Relay

251 11, 307362, G05D 1500, G05D 2300

Patent

active

042483778

ABSTRACT:
The invention relates to a controlled heating system for maintaining a predetermined or set temperature in a medium of small dimensions which may be a gas, liquid or solid. A single element such as a power transistor functions as a heat transfer device for supplying heat to the medium and as a heat sensing device for sensing temperature changes in the medium which can be fed back and serve as control data for supplying make-up heat to maintain a predetermined temperature. The transistor supplies heat via heat dissipation in its collector-emitter path and senses heat changes via its base-emitter voltage which varies in response to temperature changes in the medium. The controlled heating may be applied to a valve assembly for a refrigeration plant of the kind used for controlling the flow of refrigerant from the evaporator to the compressor. The closure member for the valve unit is controlled directly or indirectly by a movable wall of an expansible chamber filled with a refrigerant medium having vapor and liquid phases. The transistor serves as a heat transfer element and as a temperature responsive sensor element.

REFERENCES:
patent: 2696739 (1954-12-01), Endres
patent: 2871376 (1959-01-01), Kretzmer
patent: 3413438 (1968-11-01), Gardner et al.

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