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<div class="moz-cite-prefix"><font face="Helvetica, Arial,
sans-serif">Corwyn, I was joking about the hot humid climate of
Maine. Relative to most places in the US, it is NOT!<br>
<br>
If we try to model night cooling, we pick a threshold
temperature, say 68, then increase natural ACH from 0 to about 5
(pretty much as much as you can get in practise). This would be
in an hourly model. The hard part, for which I have no good
answer, is the heat transfer from the mass to the airflowing
across it. Any physical checking I have done on particular
rooms shows the transfer to be quite slow due to things like
furniture and furnishings.<br>
<br>
Opening windows depends on clients and weather. In say,
Chicago, there can be weeks when the temperature at night is not
below 70-75 and so is not an effective cooling option. In many
houses, people dont know or want to bother opening windows at
the right time. Based on the my walks through suburbia across
the US in the early evening when it is cool outside and the AC
units on house after house are running, I would venture to say
this is the vast majority of people.<br>
To me there is not much doubt that you can tweak a design to
solve one person/family's personal preference and tolerance for
high temperature. But if we are to make a real differences to
millions of new and retrofit homes, it seems the safer bet is to
make designs that require less effort to operate, assume normal
comfort tolerances, and assume people are not always home and
willing to operate components. Yes, this is not the least
resource solution imagninable, but it is more likely to be a
real step towards a massive shift rather than a few really low
energy houses. <br>
<br>
</font>
<div class="moz-signature">Dr John Straube, P.Eng. <br>
<a class="moz-txt-link-abbreviated" href="http://www.BuildingScience.com">www.BuildingScience.com</a></div>
On 12-08-15 5:30 PM, Corwyn wrote:<br>
</div>
<blockquote cite="mid:502C14FA.4050800@midcoast.com" type="cite">
<br>
The Climate of Maine is not what I would call *really* hot and
humid. The temperature here (South of the Corson house) hasn't
been over 90°F this summer. My house has not been uncomfortable
this summer. Corson is a smart guy, but he may need time to
become more familiar with his new circumstances, to achieve
comfort.
<br>
<br>
The trouble with my model is that the difference between
comfortable and too warm, in this climate, depends a lot on night
time cooling, using open windows (if you aren't willing to use
energy on AC). My software is not very smart about when opening
windows is desired. It isn't good at estimating the degree of
cooling which can be obtained. I would *love* any thoughts on the
proper way to do either of those.
<br>
<br>
<br>
</blockquote>
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