Problem 8: A glass plate at 40°C is heated by passing hot air over it with a convection coefficient of 18 W/m2K. If the
temperature change over Imm thickness is not to exceed 5°C to avoid distortion damage, determine the
maximum allowable temperature of the air. Thermal conductivity of the plate material is 1.4 W/mK.

Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.2-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kpa (gage) in the tank. if the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top in liters per second.