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conditioned space

Saving Energy, or Not: Mixing Breezes, Ice Blocks, and Toilet Paper

By Energy Rant One Comment
Four years ago, I wrote about a few home energy-saving tips in Refrigerator Sitcoms and Lethal Toaster Ovens. I said I would need to write a series because there are so many, mostly bad, energy saving tips to write about. With four years passing, it is more like a movie sequel than a TV series. Knowing the “why” behind anything helps it stick, like training. Here goes. The Ceiling Fan Famous advice for ceiling fans is to have them move air down (counterclockwise) in summer, and up in winter. A ceiling fan can do two things only. It can generate…
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Duct Leakage Chaff

By Energy Efficiency, Energy Rant 3 Comments
Due to duct leakage, only 57% of heat generated in a home furnace is delivered to conditioned spaces.  OMG!  Run for your lives.  Big deal. I have overheard conversations at conferences and other networking gigs that include statements like, “We are so focused on envelope tightness, insulation, energy-saving windows, and efficient appliances, but meanwhile we are wasting almost half the heat produced in an energy efficient furnace.”  Not so fast. In mechanical engineering, we have the first and second laws of thermodynamics.  The first law is like a change machine – conservation of money.  Put a piece of cotton-infused paper…
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