Problem 6.15 HVAC Cistern In an attempt to conserve water and to be awarded LEED (Leadership in Energy and Environmental Design) certification, a 15.0 x 103 L cistern has been installed during construction of a new building. The cistern collects water from an HVAC (heating, ventilation and air-conditioning) system that is designed to provide 1.00 x 105 ft/min air at 22.0°C and 40.0% relative humidity after converting it from ambient conditions (35.0°C, 78.0% relative humidity). The collected condensate serves as the source of water for lawn maintenance. Assume P = 1 atm. Physical Property Tables