Question

Ventilation air at 3500 cfm, 55°F and 40% RH is to be conditioned to 70°F and 55% RH. Atmospheric air pressure is 14.7 psia. Determine: 1. Mass flow rate of dry

air, 2. Mass of water added, 3. Humidity ratio at the entrance of the air handling unit, 4. Humidity ratio at the exit of the air handling unit, 5. Energy required for the process using the psychrometric chart, and 6. Estimate of energy required using approximate relationships.

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