Drying and gas or vapor contact with solids – Apparatus – With automatic control
Patent
1995-05-17
1996-11-05
Kwon, John T.
Drying and gas or vapor contact with solids
Apparatus
With automatic control
34557, 34491, F26B 1310
Patent
active
055705200
ABSTRACT:
In a clothes dryer, the air exiting the dryer for wet clothes has a high relative humidity compared to the relative humidity when the load is dry. A change in the relative humidity of the air leaving the dryer indicates a change in dryness of the load. The relative humidity is measured by using two thermistors located in an air outlet of the dryer. The first thermistor is nonself-heating and uses a relatively low current to detect the temperature of the air in the air outlet. The second thermistor is self-heating and operates at a higher current so that its temperature is higher than the air temperature. As the air moves across the heated thermistor it will conduct more heat away from the thermistor when the relative humidity of the air is high than when it is low. The air temperature and heated thermistor temperature are compared frequently during the drying cycle. When the load is wet the difference between the two thermistors is small. When the load is dry the difference is greater. A microcontroller circuit controls the temperature sensing and difference computation.
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Eaton Corporation
Kwon John T.
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