Find the net work and efficiency in btu/lbm of an ideal saturated ranking cycle with one open free water heater which uses freon-12 as the working fluid and operates between 200f and 72f. show your work and

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.