4. A thin 80 cm long and 8 cm wide horizontal plate is maintained at a temperature of 130°C in a large tank full of water at 70°C. Estimate the rate of heat input into the plate necessary to maintain the temperature of 130°C.
Given:
Horizontal plate length, L = 80 cm = 0.8 m
Width, W = 8 cm = 0.08 m
Plate temperature, Tw = 130°C
Fluid temperature, T = 70°C
To find:
Rate of heat input into the plate, Q
Solution: