Q12. The data below is for the wall in a building: Item external surface Brick insulation Heavy concrete block plaster The heat transfer coefficients for the surfaces are: convective radiant convective radiant internal surface thickness (mm) conductivity (W/mK) 105 25 200 13 i. ii. The wall has a surface area of 10 m². (a) Determine: 0.84 0.035 0.25 0.16 18 W/m²K 4.5 W/m²K 3.0 W/m²K 5.0 W/m²K the total resistance of the wall (R₁) [0.189 K/W] [0.53 W/m²K] the U value of the wall (b) when the temperature indoors is 20°C and the temperature outdoors is 1°C, determine: (c) the rate of heat loss through the wall (d) the temperature of the inside surface of the wall [100 W] [18.7 °C] Q13. What should the thickness of insulation in the above wall be increased to so as to give a 50% reduction in U value and what would be the new inside surface temperature? [91 mm, 19.4°C]

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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.