In a large chemical factory, hot gases at 2273 K are cooled by a liquid at 373 K with gas side and liquid side convection heat transfer coefficients of 50 and 1000 W/(m2 K), respectively. The wall that separates the gas and liquid streams is composed of 2-cm thick slab of stainless steel on the liquid side. There is a contact resistance between the oxide layer and the steel of 0.05 m2.K/W. Determine the rate of heat loss from hot gases through the composite wall to the liquid.

GIVEN



FIND

Rate of heat loss from hot gases through composite wall to liquid.

ASSUMPTIONS

- 1 Dimensional steady state heat transfer

- Thermal conductivity remain constant.

- Radiation is negligible.

SKETCH


Total resistance for the heat flow through the pipe is given by



Heat flux for the above resistance for given temperature difference is given by

Physics & Space Science

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