Automatic temperature and humidity regulation – Humidity control
Patent
1997-03-28
1998-09-15
Tanner, Harry B.
Automatic temperature and humidity regulation
Humidity control
237 2A, G05D 2202
Patent
active
058067639
ABSTRACT:
A thermostat and method for controlling relative humidity is disclosed. The thermostat and method embodied therein controls a heater to maintain the ambient temperature a few degrees above a minimum temperature that is required to prevent condensation, frost and/or freezing. The thermostat controls heater operation from calculated saturation (dew point) temperature values derived from sensed relative humidity and ambient temperature values. The thermostat compensates for sensor non-linearity without the use of additional hardware circuitry or the use of memory intensive lookup tables. In addition, the thermostat of this invention adjusts for the inherent variances in electrical characteristics of the particular sensors used in thermostat circuitry. In one embodiment, the thermostat controls the operation of the heater to maintain the ambient temperature a few degrees above the calculated dew point. In a second embodiment, the thermostat maintains the ambient temperature a few degrees above the freezing point or the calculated dew point, whichever is the higher temperature.
REFERENCES:
patent: 3284003 (1966-11-01), Ciemochowski
patent: 4105063 (1978-08-01), Bergt
patent: 4799621 (1989-01-01), Reith
patent: 4801211 (1989-01-01), Yagi et al.
patent: 5346129 (1994-09-01), Shah et al.
Crump R. Tracy
Tanner Harry B.
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