The Importance of Window Placement and Orientation for Energy Efficiency
Doug Boleyn is an energy expert. In 1974, he and his wife built a solar heated home. Today, Doug manages commercial solar programs for Energy Trust of Oregon, sits on the Board of Directors of Solar Oregon, and has applied his energy conservation expertise to countless projects. Doug leads through practice, demonstrating Net Zero design in his current Pacific Northwest home. We met Doug and the partners on his Net Zero home project, energy efficiency builders Cellar Ridge Custom Homes and architect Mathhew O. Daby a couple months ago during Solar Oregon’s Goal Net Zero 2010 event.
A key strategy Doug implemented is the practice of “directionally tuning” high performance glass to manage the sun to his home’s energy-saving advantage - allowing for greater overall efficiency, cost-savings, and indoor comfort. Critical to the art of tuning is understanding your climate and orientation of your home relative to the sun. In Doug’s case, the Pacific Northwest is a mild climate - one of few extremes.Window performance is critical to capture as much solar energy, “free heat”, as possible, for best energy-saving winter performance, extensive views and daylighting, and air ventilation and cooling during warmer days. Doug explains the concept in this short video:
Understand Doug’s energy-saving strategies in this paper (PDF download) about his “Morning Sun: A ‘Net Zero’ Energy Home” - an absolute must read case study that combines energy conservation with maximum ‘harvesting’ of energy. An excerpt of the paper introduces his “tuned” approach:
43 percent of the window area faces south, providing unobstructed direct sunlight in winter, yet with carefully designed overhangs to prevent summer overheating. Serious Materials-brand windows were selected because they provided very low U-values coupled with variable Solar Heat Gain Coefficients (SHGC) that were suitable for the different facades on the house.
See pictures of Doug’s house here.
Thank you for sharing this. I’m always looking for great resources to send to clients and my colleagues, and this article is absolutely worth sharing!
[...] a variety of energy efficient approaches and materials, including super-insulating high R-value and tuned SeriousWindows, this traditional style home accomplishes 90% energy reduction compared to the [...]