Fast assessment method of annual energy consumption for DSF and SSFs

Double skin facade (DSF) is widely used to improve energy efficiency in buildings. Many studies have analyzed the thermal performance of DSF and single skin facade (SSF) on just standard days or typical moments. However, in order to more accurately analyze its energy-saving effect, its annual thermal performance should be evaluated. For achieving this, a large number of simulations are needed and it is extremely time consuming and complicated. This study provides a new fast calculation method for annual thermal performance and energy consumption of DSF and SSFs. Firstly, based on CFD technique, a simulation method for obtaining indoor temperature of DSF during whole year was established, and the results were verified through experiments. Then, a new simulation calculation method for heating and cooling periods was established, thereby completing annual thermal performance simulation of different facades. Finally, based on total heat gain/loss of each facade, the energy consumption of mentioned facades was calculated, and facades' various performance can be seen for entire year. As an overall result for Beijing located in cold region, by considering whole year energy consumption, DSF plays as the best one with 18 % energy saving in the whole year compared to the second one which is 3 glazing exterior shading SSF; however, this SSF can save 37 % building area compared to DSF. The result of this study can be useable for other cities with same climate as the Beijing. The analyze method proposed in this study is useable for optimizing building facades in different climates.