29 Apr '14, 11am

Interesting paper on #passivhaus Internal Heat Gain assumptions. @ecominimalnick @AR_Clarke

Effects of Internal Heat Gain assumptions in PHPP Passivhaus experts Nick Grant and Alan Clarke have written a paper in which they highlight the effect of internal heat gain assumptions across a range of building sizes and usage. The paper addresses that basing internal heat gain (IHG) calculations on floor area leads to misleading predictions of heating demands for small buildings. The Passivhaus standard favours large dwellings as well as those with more efficient shapes . A small building will have a higher external surface area for a given floor area and this has led to the use of extreme U values and additional areas of south glazing on what would otherwise be low cost modest dwellings. The proposal for the rate of internal gains to be dependent on floor area in the domestic PHPP is not meant to be a “cheat” to get small houses through a loophole, it is simply a corol...

Full article: http://www.passivhaustrust.org.uk/news/detail/?nId=346#.U...

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