Saturated steam flows 10,000 W/m² K). The Air 30°C Problem #2: Calculate and compare the heat losses per unit length from an insulated and an un- insulated (bare) copper pipe (k=400 W/m K) that has an internal diameter of 10 cm and an external diameter of 12 cm. inside the pipe at 110°C (hei pipe is located in a space at 30°C and the heat transfer coefficient on its outer surface is estimated to be hoo-15 W/m²K. The insulation available to reduce heat losses is 5 cm thick and its thermal conductivity is 0.20 W/m K Steam Steam 110°C