Abstract
Based on the air condition systems theorem, by EnergyPlus7.0 the office building models were built up with the variable air volume (VAV) and constant air volume (CAV) systems separately at SPSU campus in the USA. The weather datum from Department of Energy US were used to simulate the energy consumption performance both daily and annually. Results show that the VAV system saves the sensible cooling rate 19.25% compared with the CAV one in the hottest day. The VAV system saves the sensible cooling rate 8.95% and reduces the outdoor infiltration sensible heat gain about 35.06% yearly. The VAV terminal-damper position doesnt change linearly as the outdoor climate temperature for the complex system in heating, ventilating, and air-conditioning (HVAC). Though the outdoor temperature is the same, the system sensible cooling rate is greatly different in autumn and spring day.
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