Passivhaus ventilation: It’s not a lot of hot air

[Kate de S]

Mark Siddall's article 'Passivhaus ventilation: It’s not a lot of hot air' can be downloaded from here http://aecb.net/news/2012/03/passivhaus-ventilation-its-not-a-lot-of-hot-air/.

Please feel free to comment or ask additional questions here.

[Toby Cambray]

Sue Roaf are you listening?!

[Jean-Marc Bouvier]

Mark has done a fine job in explaining HRV's but lets please remember that they were invented, in Canada (I am from Winnipeg), to satisfy 2 things, one to supply fresh air in a "tightly" built home (while extracting stale and polluted air) and the 2nd to control the humidity levels in structures that are susceptible to rotting (wood structures).

[David OLIVIER]

Indeed. I've just looked at some figures which suggest to me that a Canadian HRV of ~1979 was as energy-efficient - i.e. it had as low a specific fanpower - as the best available today in Germany. Why no great progress?

I think most people in Germany would acknowledge that Canada had the Saskatchewan Conservation House long before they had the Passivhaus Standard.

[Dave Howorth]

a Canadian HRV of ~1979 was as energy-efficient - i.e. it had as low a specific fanpower - as the best available today in Germany. Why no great progress?

I'm quite surprised by that, and impressed, since I thought that electric motor technology had moved on significantly in the last thirty years. Do you have source document(s) for the technology, please?