In an air conditioning system the inside and outside conditions are dry bulb temperature 25 °C, relative humidity 50 % and dry bulb temperature 40 °C, wet bulb temperature 27 °C respectively as shown in figure below. 50 % of the return air is recirculated and mixed with 50% of make-up air (fresh air) before the cooling coil. The room sensible heat factor is 0.8 and the mass of air supplied to the room is 240 kg/min. Assume by-pass factor as zero. A. Show the process on the psychrometric chart B. Determine the following: a. The enthalpy of fresh air at point 1, enthalpy of air at point 2 and The apparatus dew point of the cooling coil b. Enthalpy of air at point 3 and at point 4 c. Refrigeration load on the cooling coil.