Working towards a future of almost non-existant heating and cooling bills!
Final Blower Door Test for Shelburne House!
January 15th, 2013
Well, it has been a few months since the last blog. The house is
almost finished. Today we get the last blower door test. The last
two test came out above the expected 0.6 ACH50. They were more
in the range of 2.0 ACH50.
We are hoping after the drywall is up that the house will test at
more like 1.0 ACH50.
The house is very nice. I am really excited for the owner to move in. I am sure she is as well.
Fort he blower door test today we will be disconnecting the wood stove. We think that much of the leakage we have
been seeing in the tests are the result of this and other penetrations.
I'll blog on the test results either later today or tomorrow.
January 17th, 2013
Eco Houses of Vermont, LLC
Results for the blower door test on Tuesday afternoon were good. We had an air infiltration of 174 cfm. The
floor area for the house (calculated using Passive House Treated Floor Area parameters) is 973 square feet and
using traditional measurements 1005 square feet. A small house, but with a very low cfm.
This air rate of 174 cfm is equal to an ACH50 of 1.04 so a 1. It is 0.4 higher than the requirement for Passive
House so the house won't be certifiable under that program, but the owner is not interested in getting the
house certified as a Passive House.
The energy usage of the house, as modeled in the Passive House Planning Package 2007 (PHPP) with a 1.0
ACH50 is 7.324 kBtu/hour. This is equal to 2.15 kW. A hand hair blow dryer is between 1.2 and 2.2 kW
(depending on the size of the hair dryer you buy).
This means that this house can literally be heated by a hair dryer.
Now to be clear you couldn't heat this house with a hair dryer because a hair dryer isn't designed to be used
24 hours a day, 7 days a week for seven months out of the year (Vermont heating season). But the rated
heating power of the heating plant can be that low.
For comparison's sake, this house would use approximatley 8 kW if it was built to code, four times more
energy to heat.
This will be a very warm and comfortable home for the client.
The client will be monitoring the house. We will have actual realtime data on how the house performs. Data
that will support the modeling which shows this level of energy savings (we hope)!
More once our client has moved in!
Copyright 2013 Eco Houses of Vermont, LLC
Chris West is a Certified Passive House Consultant
Affiliated with the PHIUS and PHI 2013