Air at 200 kpa enters a 2-m-long, thin-walled tube of 25-mm diameter at 150°c and 8 m/s. steam at 20 bars condenses on the outer surface. determine the outlet temperature and pressure drop of the air, as well as the rate of heat transfer to the air. evaluate the properties of air at tm=450 k

The magnitude of the amount of energy released by burning a fuel source, measured in energy per unit mass, is called its fuel value. note that the fuel value is the negative of the isobaric specific heat of combustion for the fuel. if all the energy obtained from burning 1.23 pounds of butane with a fuel value of 10.85 kcal/g is used to heat 128.0 kg of water at an initial temperature of 18.3 °c, what is the final temperature? note that 1 lb = 453.6 g.