Question 2 An air conditioner cools 225 kg of humid air/min at atmospheric pressure (1 atm), 42C and 72% relative humidity to 12C. Molecular weights of water and air components are 18 g/mol and 29 g/mol, respectively. (a) Do a degree-of-freedom analysis to prove that enough information is available to calculate required cooling duty. (b) Calculate the molar flow rate of condensation of water from the unit and cooling heat in kJ/min.

An air conditioner cools 225kg of humid air /min at atmospheric pressure (1atm),42C and 72% relative humidity to 12C. Molecular weights of water and air components are 18 g/mol and 29g/mol, respectively. (a) Do a degree-of-freedom analysis to prove that enough information is available to calculate required cooling duty. (b) Calculate the molar flow rate of condensation of water from the unit and cooling heat in kJ/min