Saturday, December 8, 2012

DIY Heat Recovery Ventilator (HRV)

An HRV pulls fresh air into the house and exhausts stale air to the outside.  In the HRV, the fresh and stale air pass through a heat exchanger that recovers most of the heat remaining in the stale air to heat the incoming fresh outside air -- thus providing a significant saving in energy to heat the incoming air.

While I've been looking for material on building an HRV, I've not had much luck in finding anything that appeared to have a chance of working well over time.  This book from William Shurcliff that has a little on a DIY design, but its pretty minimal.

Paul from BC noted the above page and came through with the article below describing an HRV design that uses sheets of Coroplast material for the heat exchanger.  Paul actually built one of these for his own house some time back and it worked well for the time period he was in that house.  It seems to me that the Coroplast has a descent chance of holding up well in the somewhat hostile (wet and even icy) environment inside an HRV heat exchanger.  Thank you Paul for sending this in!

The Coroplast HRV design

Full details on building the Coroplast sheet HRV...

New section on HRV's ...
A completed HRV

December 8, 2012

1 comment:

  1. When moisture is being added to indoor air with a humidifier then this moisture will condense inside the HRV when it is cooled before being expelled. This is a continuous process so a drain should be provided to carry the water safely away. However there are semi-permiable membranes that can be used in the HRV to allow the moisture to migrate to the incoming fresh air so the HRV transfers not only heat but moisture as well. This saves the trouble of draining the condensed water as well as the extra stain on your household humidifier to constantly replace the water that the HRV would otherwise be removing.


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