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Q7. Dry saturated steam at 14 bar enters a steam pipe 50 m long with an outer diameter of 150 mm. The pipe is covered with ii Inner layer of moulded insulation 50 mm thick and an outer Layer of mineral felt 30 mm thick.

The mass flow rate of steam in the pipe is 500 kg/hr.

The air temperature surrounding the pipe is 15°C.

Calculate EACH of the following:

(a) The rate of heat loss from the pipe

(b) The mass of steam condensed per hour.

Note: Inner heat transfer coefficient of the pipe 1000 W/m²K

Thermal conductivity of moulded insulation = 0.075 W/m K

Thermal conductivity of mineral felt = 0. 15 W/mK

Outer heat transfer coefficient of the pipe = 13 W/m²K