Study on energy conservation effect of hybrid ventilation system utilizing wind pressure for multi-family buildings

According to the R&D Project on Low Energy Housing with Validated Efficiency, the CO2 emissions due to operation of ventilation systems are estimated to be 7 to 12% of total CO2 emissions of a unit of multi-family buildings in mild climate regions of Japan. Using network model calculations, CO2 emissions of a hybrid ventilation system using Natural Ventilation Openings and other ventilation systems were estimated. The input power needed by the ventilation system can be reduced by 79 % when it employs the hybrid ventilation system compared with when it employs the balanced ventilation system. The hybrid ventilation system features not only sufficient ventilation performance, which is estimated by using the Overall Supply Rate Fulfilment index, but also reduced power input.