In case the body stay in lower temperature for short period (less than 20 minutes), explain how the body response to it.

## In case the body stay in lower temperature for short period (less than 20 minutes), explain how the body response to it.

Sweat stops being formed. The minute muscles under the exterior … Read More...
b. The figure below shows a cross section through an insulated heated pipe which is made of steel (thermal conductivity, k = 45 W/m K) with an inner radius (r1) of 800 mm and an outer radius (r2) of 1300 mm. The pipe is coated with two layers of insulating materials, the first layer has a thickness of 200 mm and thermal conductivity, k =25.9 W/m K, the second layer has a thickness of 400 mm and the thermal conductivity, k = 35 W/m K. Air at Tf1 = 310 oC flows through the pipe and the convective heat transfer coefficient from the air to the outside has a value of h1 = 120 W/m2 K, The outside surface of the pipe is surrounded by air which is at 50 oC (Tf2) and the convective heat transfer coefficient on this surface has a value of h2 = 90 W/m2 K. Calculate, (a) the thermal resistance (b) the heat transferred (c) temperature T1, T2, T3 and T4 (d) comment on your results.