A steam pipe, which is 150mm external diameter, carries wet steam at 3.6 MPa. It is covered with two layers of lagging e

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A Steam Pipe Which Is 150mm External Diameter Carries Wet Steam At 3 6 Mpa It Is Covered With Two Layers Of Lagging E 1 (78.44 KiB) Viewed 39 times

A steam pipe, which is 150mm external diameter, carries wet steam at 3.6 MPa. It is covered with two layers of lagging each 40mm thick. The coefficients of thermal conductivity for the two layers are 0.07 W/(m.K) for the inner layer and 0.1 W/(m.K) for the outer layer. The surface transfer coefficient for the outer surface is 3.0 W/(m².K). (21 800 kJ) 5.1. Estimate the heat loss/h for a 50m length of the lagged pipe. 5.2. The ambient temperature is 27°C. What would be the surface temperature of the lagging? (68.5°C) Neglect the thickness of the steam pipe and assume that its temperature is constant throughout and, together with the inside surface of the inner layer of lagging, is at the same temperature as the wet steam.