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<div class="moz-cite-prefix">On 4/24/2013 7:21 PM, Peter Kidd wrote:<br>
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<blockquote cite="mid:51786917.9040106@shaw.ca" type="cite">
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<div class="moz-cite-prefix">I think actually thermal diffusivity
is the more relevant parameter.<br>
We are expecting to hit 5C (41F) for the first time since
Halloween tomorrow, I am not sure thermal mass is so wonderful
buried in the wall in this climate.<br>
There are several ways that HD Day is calculated. For Code in
Canada it's based on the mean daily temperature so I suppose
that might be seen as "hourly computed", but is it <i>always</i>
lower?<br>
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<br>
No, mean daily is explicitly<i> not </i>hourly computed as I was
using that term. It is always lower as long as there is at least
one crossing of the HDD setpoint. I don't know if that occurs for
you northerners... :-)<br>
<br>
Thank You Kindly,<br>
<br>
Corwyn<br>
<pre class="moz-signature" cols="72">--
Topher Belknap
Green Fret Consultin
Kermit didn't know the half of it...
<a class="moz-txt-link-freetext" href="http://www.GreenFret.com/">http://www.GreenFret.com/</a>
<a class="moz-txt-link-abbreviated" href="mailto:topher@greenfret.com">topher@greenfret.com</a>
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