Thermoelectric actuator for temperature control systems

Automatic temperature and humidity regulation – Ventilator type – Electrically actuated

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Details

60531, 236 68B, G05D 2330

Patent

active

054234794

ABSTRACT:
A temperature control system for a building or the like having a plurality of individually-controlled temperature zones wherein temperature variations from a set temperature generate actuating signals for valves, dampers or other regulating devices to vary temperatures in respective zones. The regulating devices are controlled by electrical-to-mechanical transducers which convert electrical actuating signals from a central controller to mechanical displacements at respective regulating devices. Each actuator has a piston assembly operated by working pressures which vary as a function of temperature in the zone being controlled. Pressure on the piston assembly is controlled from an expansion chamber containing an evaporatable-condensable refrigerant which is selectively heated and/or cooled by a semiconductor thermoelectric module. Operating as a heat pump, the thermoelectric module either evaporates or condenses the refrigerant in the expansion chamber in accordance with sensed temperature variations in the controlled zone to proportionally vary pressure in the expansion chamber.

REFERENCES:
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patent: 4248377 (1981-02-01), Jakobsen
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patent: 4535590 (1985-08-01), Jacobsen et al.
patent: 5014520 (1991-05-01), Orner et al.
Johnson Controls Systems and Services Division, Milwaukee, Wisc. 53201-0423, Publication No. 2074.

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