[Greenbuilding] Active Ventilation for Tiny Space

J Daglish johndaglish at gmail.com
Sun Nov 5 08:15:45 CST 2017


Here is a English project  that faced similar dilemas - Grove Cottage (with
lots of download info files) ;

http://passivhausbuildings.org.uk/viewproject.php?id=199

Regards

John Daglish
Paris, France

2017-11-03 15:30 GMT+01:00 conservation architect <elitalking at rockbridge.net
>:

> I have returned to this great list for more good advice.
>
> I am thermally upgrading a small room that is a separate wing of the house
> to be tighter.  When I build new, I install continuous foam insulation to
> make the house tight, definitely requiring active ventilation.  In building
> that is conventional where more than enough passive ventilation is present,
> not so much need for active ventilation.  Where the decision becomes more
> difficult is when we incrementally improve the tightness, leaving portions
> of the thermal envelope with the classic flaws.
>
> In this case, I am on a steep hill.  The upper level has an open
> ventilated space under it.  This is a very small space.  (8’x12’) with
> cathedral ceiling.  Therefore, almost all surfaces are exterior.  I am
> upgrading the North Wall with 3” rigid foam.  I am installing 2” iso below
> the ceiling with new ceiling panel.  We are getting set to install mini
> split heat pumps in three zones.  My intention is to make a room that is
> super efficient so my wife who is always cold (poor circulation) can
> elevate the temperature to what ever she needs to achieve comfort (80F+)
> without requiring the whole house to be that hot.  I do not have the space
> to insulate the floor.  However, I was planning on putting building wrap
> under the carpet pad to create the continuous air barrier.  The South Wall
> has clearstory windows above lower roof.  This wall will remain with
> flaws.
>
> I am currently heating with wood.  However, we are wanting our
> photovoltaic array to meet the new electric loads of the mini split heat
> pump.  Though I claim net zero emissions from burning wood where I harvest
> from fallen trees on my land, producing heat with heat pump and home
> produced electricity, I am lowering my carbon footprint significantly.
> Though the cycle for wood sequestration and emissions is quite short, if I
> leave the wood on the ground it will take a much longer time before
> decomposition eventually emits the sequestered carbon.
>
> Thanks for reading my message.
>
> Eli
>
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