Heat exchange – Movable heating or cooling surface – Rotary drum
Patent
1992-02-26
1993-09-28
Hepperle, Stephen M.
Heat exchange
Movable heating or cooling surface
Rotary drum
62217, F25B 2900
Patent
active
052479897
ABSTRACT:
A temperature-controlled environmental chamber includes a resistance heater powered through a first solid state relay and a refrigeration unit including an electrically powered thermally controlled suction throttling valve connected in the refrigerant line between the evaporator and the inlet of the compressor, and including a bimetal motor and a heating element therefor powered through a second solid state relay. A thermostat senses the temperature in the chamber and compares it to a set point temperature and outputs a pulse-width modulated control signal indicative of the difference between the two temperatures. The control signal directly controls the heater relay for substantially continuous variation of the heater between minimum and maximum heating conditions. The control signal also directly controls the throttling valve relay by controlling the power to its heating element for substantially continuous variation of the valve between maximum and minimum cooling conditions, so that the amount of cooling provided is inversely proportional to the amount of heating provided.
REFERENCES:
patent: 3698204 (1972-10-01), Schlotterbeck et al.
patent: 4494184 (1985-01-01), Crevel
patent: 4566528 (1985-01-01), Helmle et al.
patent: 4589060 (1986-05-01), Zinsmeyer
patent: 4663725 (1987-05-01), Truckenbrod et al.
patent: 4784213 (1988-11-01), Eager et al.
patent: 4789025 (1988-12-01), Brandemuehl et al.
patent: 4928750 (1990-05-01), Nurczyk
ALCO Co. catalog pp. 105-108 for "PETR" control valve., no date given.
Hepperle Stephen M.
Lab-Line Instruments Inc.
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