19 Aug '11, 10am

A Bold Attempt to Slay R-Value

Building scientists have known for years that the rate of heat flow through insulation materials varies at different temperatures. Many researchers have tested insulation materials at a variety of mean temperatures, and their results have long been published. At this summer’s conference, Schumacher summarized a few well-known facts. “If you measure the R-value of an R-13 fiberglass batt, you’ll get different results at different outdoor temperatures,” said Schumacher. “If the outdoor temperature rises, the R-value goes down. If the outdoor temperature drops, the R-value rises. Why? Because as you move to a higher temperature, you get more radiation happening, and therefore a lower R-value. But at lower temperatures, there is less conduction Movement of heat through a material as kinetic energy is transferred from molecule to molecule; the handle of an iron skillet on the s...

Full article: http://www.greenbuildingadvisor.com/blogs/dept/musings/bo...

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