A hot plate 1 m × 1.5 m is maintained at 300°C. Air at 25°C blows o

1.	A hot plate 1 m × 1.5 m is maintained at 300°C. Air at 25°C blows over the plate. If the convective heat transfer coefficient is 20 W/m2°C, calculate the rate of heat transfer.
Answer» Area of the plate exposed to heat transfer, A = 1 × 1.5 = 1.5 m² Plate surface temperature, t_s = 300°C Temperature of air (fluid), t_f = 20°C Convective heat-transfer coeffficient, h = 20 W/m²°C Rate of heat transfer, Q : From Netwon’s law of cooling, Q = hA (t_s – t_f ) = 20 × 1.5(300 – 20) = 8400 W or 8.4 kW.

A hot plate 1 m × 1.5 m is maintained at 300°C. Air at 25°C blows over the plate. If the convective heat transfer coefficient is 20 W/m2°C, calculate the rate of heat transfer.

Answer»

Area of the plate exposed to heat transfer, A = 1 × 1.5 = 1.5 m²

Plate surface temperature, t_s = 300°C

Temperature of air (fluid), t_f = 20°C

Convective heat-transfer coeffficient, h = 20 W/m²°C

Rate of heat transfer, Q :

From Netwon’s law of cooling,

Q = hA (t_s – t_f )

= 20 × 1.5(300 – 20) = 8400 W or 8.4 kW.

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A hot plate 1 m × 1.5 m is maintained at 300°C. Air at 25°C blows over the plate. If the convective heat transfer coefficient is 20 W/m2°C, calculate the rate of heat transfer.

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