Aclient wishes to air-condition a small commercial double brick building having a tiled roof located in alice springs. the air conditioning will need to cope with day and evening retail client and staff occupancy. three proposals are under consideration i) an evaporative cooling system ii) an indirect evaporative system iii) a split vapour compression system with reference to appropriate design conditions discuss the relative advantages and disadvantages of the three methods of air-conditioning b) design data for a zone in a vav system are given below: location zone condition load variation supply air condition: control: sydney city 24 oc, rh in the range 45 % to 60 % from 600 w to 1500 w 14 oc, 85% rh using dry bulb temperature shr varies from 0.7 to 0.9 calculate estimates for the range of primary airflow required for this zone. c) determine the air handler fan flow rate for a commercial building having four zones. the peak cooling load for each of the four zones is 6kw, including ventilation air. coil conditions are 29 °c and 38% rh at the inlet and 12 °c and 90% rh at the outlet. the diversity among the four zones is 80%. calculate sizes for the main duct and all four branch ducts. assume: sea level, average duct roughness