Abstract
The purpose of this study is to evaluate the indoor environment and energy performance of an air-conditioning system with an outdoor air handling unit and a multi-split-type air-conditioner when outside air and room load are processed by these air handling units. Herein, a coupled heat load processing model is first developed, and its reproducibility is clarified by comparing the measured values in a university lecture room with the calculated values of the developed model. Next, using this model, from the simulation for an office building, it is clarified that the seasonal energy consumption can be reduced, while maintaining the indoor temperature and humidity environment by changing the air supply temperature setting of the outdoor air handling unit according to the outdoor air conditions. Moreover, this study verifies that energy saving is achieved through the control of the CO2 concentration by the outdoor air handling unit. In addition, it is confirmed that the increase in energy consumption when the amount of introduced outdoor air increases is caused by the increase in the outdoor air CO2 concentration.
