Steam enters a nozzle operating at steady state at 140 psia and 600 °f with a velocity of 100 ft/s. the pressure and temperature at the exit are 40 psia and 350 °f, respectively. if the nozzle can be considered to be adiabatic, determine its efficiency

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.