The Energy Performance of Electrochromic Windows in Heating-Dominated Geographic Locations

Publication Type

Conference Paper

Date Published

09/1996

LBNL Report Number

LBL-38252

Abstract

This paper presents the results of a study investigating the energy performance of electrochromic windows in heating-dominated geographic locations under a variety of state-switching control strategies. We used the DOE-2.1E energy simulation program to analyze the annual heating, cooling and lighting energy use and performance as a function of glazing type, size, and electrochromic control strategy. We simulated a prototypical commercial office building module located in Madison, Wisconsin. Control strategies analyzed were based on daylight illuminance, incident total solar radiation, and space cooling load. Our results show that overall energy performance is best if the electrochromic is left in its clear or bleached state during the heating season, but controlled during the cooling season using daylight illuminance as a control strategy. Even in such heating dominated locations as Madison, there is still a well-defined cooling season when electrochromic switching will be beneficial. However, having the electrochromic remain in its bleached state during the winter season may result in glare and visual comfort problems for occupants much in the same way as conventional glazings.

Conference Name

SPIE International Symposium on Optical Materials Technology for Energy Efficiency & Solar Energy Conversion XV

Year of Publication

1996

Conference Location

Freiburg, Germany

Call Number

LBL-38252