Abstract
Approximately 35% of winter energy loss in Twin Rivers townhouses is associated with the attic, despite the presence of 9 cm of fiberglass insulation. Unexpected heat transfer mechanisms bypass the attic insulation and strongly couple attic, basement and house. As a result, a three-zone model is required for static heat load calculations and the prediction of retrofit savings. Magnitudes of the unexpected heat transfer rates can be inferred from attic and basement temperatures and knowledge of furnace inefficiencies. The model predicts the benefits to be gained by various retrofit strategies. Effectiveness of retrofits may be considerably enhanced by blocking heat transfer bypass paths to the attic.
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