A building has a 10000 ft.sq interior office space, served by one AHU with economizer function. The supply air flow is 10000 CFM and minimum outside air flow is 1000 CFM. The desired space condition is 75F and 50%rh and the supply ir temperature is 55F. The air temperature rise is neglected through the fan. Determine outside air flow under the following outside air condition to minimize the cooling coil energy consumption. a. 100F and 68F wb.where the supply air temperature and relative humidity equal 55F and 90% respectively.