Pressurized steam at 540 k flows through a long, thin-walled pipe of 0.6-m diameter. the pipe is enclosed in a concrete casing that is of square cross section and 2 m on a side. the axis of the pipe is centered in the casing, and the outer surfaces of the casing are maintained at 300 k. what is the heat loss per unit length of pipe?

Atank with constant volume contains 2.27 kg of a mixture of water phases (liquid-vapor). in the initial state the temperature and the quality are 127 °c and 0.6, respectively. the mixture is heated until the temperature of 160 oc is reached. illustrate the process in a t-v diagram. then, determine (1) the mass of the vapor in kg at the initial state, (2) the final pressure in kpa.