An engineer wishes to heat air for a shopping mall with 100,000 kJ of energy per hour. One option is to use steam (available at 100 deg c and 1 atm pressure with a specific enthalpy of 48.168 kJ/mole. When the steam gives up its energy to heat the air, it condenses from a vapour to a liquid. The liquid consate now has a temperature of 100 deg c, a pressure of 1 atm and a much lower specific enthalpy of 7.533 kJ/mol
1. Assuming there is a minimal cooling of the condensate after condesing, how many kilograms of steam per hour must be used to heat the air
2. What is the heating power required in kW.