Approaching Net Zero Energy in Existing Housing
Author | : Canada Mortgage and Housing Corporation |
Publisher | : |
Total Pages | : 5 |
Release | : 2007 |
Genre | : Architecture and energy conservation |
ISBN | : |
This research project explored the technical feasibility of reducing the energy consumption of existing houses to net zero on an annual basis. The project characterized the energy consumption patterns in existing housing and compiled energy efficiency and energy generation measures. Through this work, the potential for energy reduction, energy storage and renewable energy generation was assessed. The project also considered the trade-offs in comfort, cost, and convenience necessary to attain very low energy consumption in existing housing. This is conceptual research as the possibility of creating a net-zero-energy house from an existing dwelling is extremely challenging. The research showed that some houses (e.g . bungalows) and some locations (e.g. Vancouver) had a far better chance of achieving net zero energy usage due to their inherent advantages. Most of the modelled houses were able to attain very low heating energy requirements. The compensating energy production, through solar thermal and photovoltaics, is often limited in effectiveness by roof size and orientation, as well as by high capital costs. The report provides a good background on what is possible for older houses and at what cost. It also provides interesting information on potential wall assemblies for these houses and decision trees on which energy retrofits to select for specific houses.