The total cooling load for a building zone is 200,000 Btu/hr with a sensible heat ratio (SHR) of 0.8. The zone temperature is 74F. The supply air is at a temperature of 54F and a humidity ratio of 0.008 lbm/lbma. Determine (a) the supply airflow rate (cfm) and (b) zone relative humidity. (10 p

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?