PassivHaus – new Euro dance genre or low-energy building standard?

Bit tardy with this blog but better late than never!

October’s module at the Centre for Alternative Technology (CAT) was the Buildings-related part of the course. Having worked in building renovation for the last few years this subject was right up my street and I was looking forward to finding out more about the topic.

One of the main take-home messages of the week was that before you even think about bolting on RE tech like PV panels or heat pumps you should really first consider the energy efficiency of your building – to paraphrase Rob Gwillim, one of the course leaders ‘energy conservation is the cheapest form of renewable energy’. In other words, minimise the losses from draughts and poor insulation as this is a far more cost-effective way of reducing your carbon footprint than retrofitting RE to your building.

Canolfan Hyddgen PassivHaus building in Machynlleth

Canolfan Hyddgen PassivHaus building in Machynlleth

Again, we had some very passionate guest speakers along during the week, who showed us some great examples of intelligent building design, that made use of techniques such as passive solar heating and natural ventilation. We were also lucky enough to have a visit to Canolfan Hyddgen (The Stag Centre), just a few miles away from CAT in Machynlleth. This was the first non-domestic PassivHaus certified construction in the UK and is a multi-purpose building owned by Powis County Council. For a quick breakdown of what PassivHaus means, go here. In a nutshell, it’s a super-low energy building standard than can reduce heating requirement by around 80-90% through super air-tightness and insulation levels. The air-tightness criteria for PH is about 17 times more stringent than current UK building standards for example.

Denmark will be adopting PH as its building standard from 2015 – setting a fantastic example of how legislation can make a big difference if there is the political will to drive it forwards. In stark contrast, in the UK our government is currently discussing reducing green levies on energy bills and commencing nuclear new build!

All in all it was another interesting, thought-provoking and enjoyable week (once we had got our first presentations done!). In November it’s the hydro module – one that I am particularly looking forward to (but not the inevitable soaking that is bound to occur when we go out into the hills!)

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