A composite wall is made up of 10 cm of common brick against 15cm of concrete with 1.5 cm of plaster on inside of wall. Assume still air in room at 25 °C. The outside air at 40 °C the wind velocity is 25 km/hr. Note: Use standard tables for values of thermal conductivities and film co-efficient. Find: a) The thermal resistance of wall b) The overall heat transfer cop-efficient. c) The steady state heat transfer rate per unit area of wall d) Heat transfer if the outside and inside film resistances are disgraded

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Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.