صقات A coat is made of 5 layers of 0.1 mm thick synthetic fabric separated by 1.5 mm thick air space. 1. Calculate the rate of heat loss through the jacket. 2. Compared the heat loss through a jackets without the air space. 3. Calculate the equivalent thickness of a wool coat, which has same total heat resistances of the synthetic fabric. Given: The thermal conductivities are given to be k = 0.13 W/m-°C for synthetic fabric, k = 0.026 W/m-°C for air, and k = 0.035 W/m °C for wool fabric, area of heat transfer 1.1 m², T1 = 28 °C, To=(-5 °C), and air heat transfer coefficient 25 W/m². C.) Assumptions: المة المرتلة من الخارج مرو المنوال 1 Heat transfer is steady since there is no indication of change with time. 2 Heat transfer through the jacket is one-dimensional. 3 Thermal conductivities are constant. 4 Heat transfer coefficients account for the radiation heat transfer.

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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.