By David Johnston, Scott Gibson
A 0 power domestic (ZEH) -- a house that produces as a lot power because it consumes -- is an concept whose time has come! Authors David Johnston and Scott Gibson (Green from the floor Up) discover the layout and building of self-sufficient homes from begin to finish.
They make the case for a ZEH cite weather and geographic demanding situations describe precisely the right way to pass approximately development an energy-efficient domestic and have ten homes that have been outfitted for 0 strength dwelling. With unequaled wisdom and a keenness for the topic, the authors stroll readers during the technique of development and residing in a very eco-friendly home.
About the Author
A chief within the eco-friendly development move, David Johnston is the writer of eco-friendly from the floor Up, lecturer and keynote speaker, and founding father of greenbuilding.com. He has acquired a number of awards for his paintings, together with being named the Environmental Hero for 2004 via Interiors and resources journal and Builder of the 12 months by way of the Washington, D.C., bankruptcy of the nationwide organization of the reworking undefined. Scott Gibson is a contract author focusing on construction themes and an established contributing editor to advantageous Homebuilding journal. he's coauthor of eco-friendly from the floor Up.
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A zero energy house is just that: It scores 0 or below on the home energy rating system (HERS) scale. It is difficult to get a 0 score, but most near zero energy homes get below HERS 20, which is excellent, given that a conventional home built to code has a HERS score of 100. ” on p. ) Testing for remodels and new construction is similar, with one exception. For a zero energy retrofit of an existing building, the place to start is with a computerized analysis of the utility bills, which can help separate out the energy used for heating, cooling, water heating, and miscellaneous electrical loads.
Once the insulation is up to Passive House standards, it takes very little passive solar gain to keep the house comfortable whenever the sun is out in the winter. 35 were state of the art. By coating the interior side of each pane of glass, low-e windows reflect heat back toward the warmer side of the glass. The technology has improved dramatically over the last three decades with low-e squared and other innovations. Canadian manufacturers and now several American window manufacturers are producing excellent very low U-value windows.
Inside the attic of the conventional house on that June 18 utility peak day, temperatures reached nearly 138ºF, while in the research house the temperature was about 100ºF, the same as the temperature outside. Both houses had R-30 of blown-in fiberglass in the ceiling. Because ducts carrying 60ºF conditioned air in the conventional house went through the attic, Parker estimated that a half ton of cooling capacity was lost before the cool air reached its destination. Keeping ducts inside the condi- tioned space in the research house solved that problem and helped designers reduce the capacity of the air-conditioning system from 4 tons to 2 tons (48,000 Btu to 24,000 Btu).