Engineering, 24.11.2020 22:00 willow2444
The temperature controller for a clothes dryer consists of a bimetallic switch mounted on an electrical heater attached to a wall-mounted insulation pad. The switch is set to open at 70 °C, the maximum dryer air temperature. In order to operate the dryer at a lower air temperature, sufficient power is supplied to the heater such that the switch reaches 70 °C (Tset) when the air temperature T is less than Tset. If the convection heat transfer coefficient between the air and the exposed switch surface of 30 mm2 is 25 W/m2 ꞏ K.
Required:
How much heater power Pe is required when the desired dryer air temperature is T[infinity]=50°C?
Answers: 3
= Set temperature = 
= Air temperature = 
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