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4. A dedicated outdoor air system (DOAS) is used to condition the air in the operating room of a hospital. The system process diagram is shown below for summer operation. The humidifier and heater/reheater are not in use (filters are present but not shown). Room sensible and latent loads are shown at the right. The room temperature must be maintained at 78°F. Supply air must at all times be at 58°F and a relative humidity of 90%. An energy recovery ventilator (ERV) pre-treats the incoming outdoor air by exchanging heat and moisture with the outgoing return air. a) What is the system's fan power requirement (air horsepower) given the total system pressure of 3.25 inches of water? b) What is the cooling load (c) in tons? c) What is the cooling load (qc) without the ERV in the system. Return Air Tr = 78°F ERV E = 0.73 Pr = 3.25 inches of water SPACE qs = 146,000 Btu/h qL = 79,000 Btu/h (FAN) TOA = 95°F Toa.wb = 76°F Supply Air Ts = 58 Os = 90% = mc 9.c