q1 a the temperature at the inner and outer surfaces of a boiler wall
Q1 (a) The temperature at the inner and outer surfaces of a boiler wall made of 35
mm thick steel and covered with an insulating material of 20 mm thickness
are 450 °C and 700 °C respectively. If the thermal conductivities of steel and
insulating material are 78 W/m°C and 0.156 W/m°C respectively, determine
the rate of flow through the boiler wall.
(b) Air at 25 °C flows past a flat plate at 2.5 m/s. The plate measures 600 mm
(length) x 300 mm (breadth) and is maintained at a uniform temperature at
95 °C. Calculate the heat loss from the plate, if the air flows parallel to the
Pr = 0.896
y = 1797 x 10-6 m²/s
k = 0.04896 W/m K
= 0.332Re,º 0.5 pp-0.333
/n(c) Water flows at the rate of 85 kg/min through a double pipe counter flow heat
exchanger. Water is heated from 50 °C to 95 °C by an oil flowing through the
tube. The specific heat of the oil is 1.680 kJ/kg.K. The oil enters at 150 °C and
leaves at 85 °C. The overall heat transfer co-efficient is 450 W/m² K. Calculate
heat exchanger area and rate of heat transfer for counter flow.
[(T₁ t₂) (T₂-t₁)
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