30 Nov '13, 9pm

"Just physics and a job well done." @AR_Clarke distills what #Passivhaus is really about:

Yes, of course you need great u-values and low air permeability to make a Passivhaus. But AECB member Alan Clarke believes that Passivhaus has something far more fundamental to teach us. Reading the Zero Carbon Hub reports on zero carbon strategies, and on the performance gap, I realise that the idea of what I now think of as Passivhaus is not what other people think. As an “extreme fabric” approach to low carbon emissions, the ZCH characterises Passivhaus in its zero carbon strategies report as having U-values 0.1-0.15, air permeability <1, low thermal bridges, plus heat recovery ventilation. Not wrong, but is that all there is to it? When I first heard about Passivhaus I too understood it as a simple recipe of U-values, air-tightness and heat recovery. Then I opened up PHPP, the Passivhaus design software, and realised there was more: a model that dealt in actual energy ...

Full article: http://www.aecb.net/what-makes-a-passivhaus/#

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@AR_Clarke

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