Outdoor air rate of building without central air conditioning and its influence on energy consumption

Summarizes the results of outdoor air rate test in three typical buildings without central air conditioning system — residence, classroom and dormitory. The results show that outdoor air rate can not meet the occupants need with air leakage only. However, outdoor air rate with open window causes excess supply of outdoor air, which leads to the additional energy consumption. And the other solution is installing mechanical ventilation system to quantitatively control the outdoor air rate but increasing fan power consumption. Taking a residential building in Beijing as an example, calculates the energy consumption with different ventilation systems including ventilation with open window and mechanical ventilation systems (with and without heat recovery), and explores the reasonable method for ventilation of buildings without central air conditioning system in China.