Experimental analysis of a hybrid ventilation system.

There are many ventilation and air conditioning systems, having their own set of advantages, disadvantages and applications. Inadequate control on ventilation rate for the case of natural ventilation system can lead to indoor air quality problems or excessive energy loss, while mechanical system is often expensive for the installation, operational and maintenance costs. The purpose of this study is to develop a new kind of hybrid ventilation system which can be described as a two-mode system to provide a comfortable internal environment using different features of both natural passive ventilation and mechanical systems at different times of the day or season of the year, and then to evaluate the performance of this kind of system by experiments in a full-scale test house which is located in the Tohoku University, Japan.