Good design and PC modeling are crucial to the successful performance of the passive solar house. Fortunately, we've superb computer design tools open to help with this particular. One could well be Energy-10, offered by the Sustainable Buildings Industry Council.
The designer enters details about the home location, sq footage, window orientations and area, glazing types, wall and floor materials being planned, etc., and also the program generates info on annual and peak heating loads, temperature fluctuation in the house, and so on. By varying the passive solar design features, the designer can tune the look to get the power performance sought.
New window glazings that have emerged because the early 1980s have greatly benefited passive solar designers. With low-e coatings and special low-conductivity gas fills, we are able to now provide more glazing without as much effect on nighttime heat loss.
In short, the windows insulate better, and then we can also add glass area for views towards the outdoors as well as for passive solar heating, without as much of the penalty in nighttime heat loss.We are able to include east- and west-facing windows with less worry about overheating by specifying special glazings that result in little solar heat gain.
In general, glazings having a high solar heat gain coefficient (SHGC) should be used on the south, while lower-SHGC glazingsmakemore sense on the east and west. Of the coatings available, the hard-coat (pyrolytic ) low-e glazings offer higher SHGC values than themore common soft-coat low-e glazings.
Thermal storage materials haven't changed all that much since passive solar first began appearing in the 1970s, but designers today possess a better knowledge of how much is required to balance out the temperature fluctuations in a home and supply warmth during the night. Some early passive solar houses were adding too much mass, or thermal mass components that were thicker than required for optimal performance.
The most crucial strategy with passive solar heating would be to invest in a designer that has knowledge about passive solar and may produce a successful design. While the concepts of passive solar heating - and particularly direct-gain passive solar-are pretty straightforward, the facts ofmaking it work well can be tough.
Bring in help with experience and knowledge, including computermodeling skills and software tools to optimize designs. Yes, you'll spendmore, but when done correctly, an investment is going to be returned often over throughout the future years and decades.
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04202011
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