Comparison analysis on thermal performances of dual airflow windows

To improve the development research of dual airflow windows, two kinds of dual airflow windows with the different frame materials have been studied respectively under the static and dynamic conditions. Under the static condition, the thermal performances of these windows were evaluated by heat transfer coefficient. Via the hot-box experiments, heat transfer coefficients were obtained: the aluminum-alloy window is 3.16W/(m².K) and the aluminum clad wood window is 1.6 W/(m².K). Under the dynamic condition, the comprehensive energy demand was chosen to represent the thermal performances, which was measured in the dynamic energy demand laboratory for one week in the winter. The results show that the differences of the full-day and hourly energy demand are very little between the aluminum-alloy windows and the aluminum clad wood windows. It has been found that solar radiation has an important impact on energy demand: the southward dual airflow windows don´t consume energy at noon and frost is rare.