Improving the energy efficiency of dynamic air condition systems in buildings with controlled resistance to window heat transfer

Abstract

This study features energy efficient designs for windows with heat reflecting screens developed by authors that are highly resistant to heat transfer. The use of dynamic air condition systems in industrial buildings, resulting in significantly increased labour productivity, as well as the proposed energy saving measures such as lowering the ambient temperature during non-working hours after preliminary air drying, and the use of window screens, permits lower production costs. Based on these studies, a mathematical model of providing dynamic air conditions in industrial buildings, featuring controlled resistance to heat transfer in windows equipped with heat reflecting screens, has been developed. A formula is given for determining the minimal indoor temperature during standby heating mode, assuming no condensation is allowed on window inner surfaces. To determine the energy efficiency of using heat reflecting window screens in systems intended to maintain dynamic air conditions, changing outdoor air temperatures for an industrial facility located in Moscow were simulated. This study shows that resistance to heat transfer in the translucent part of a window varies significantly during 24 hours not only as a result of using screens, but also due to changing indoor and outdoor air temperature differences.