3. CO2 is compressed steadily from 80 kPa and 24°C to 1300 kPa and 330°C at a mass flow rate of 0.7 kg/s. The compressor is cooled using fins on the compressor and heat is lost from the compressor at a rate of 20 kW to the surroundings at 24°C. Using constant Cp of 0.978 kJ/kg. K for CO2, determine (a) the power input to the compressor in kW, (b) the isothermal efficiency, and (c) the entropy generation in kW/K.

Water in a partially filled large tank is to be supplied to the roof top, which is 8 m above the water level in the tank, through a 2.2-cm-internal-diameter pipe by maintaining a constant air pressure of 300 kpa (gage) in the tank. if the head loss in the piping is 2 m of water, determine the discharge rate of the supply of water to the roof top in liters per second.

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.

Air is compressed isentropically from an initial state of 300 k and 101 kpa to a final temperature of 1000 k. determine the final pressure using the following approaches: (a) approximate analysis (using properties at the average temperature) (b) exact analysis