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<font face="Helvetica, Arial, sans-serif">The grid cares about the
total size of the electric load (resistive or inductive) and the
peakiness of it.<br>
<br>
As long as we have affordable natural gas or heat pump hair dryers
available for houses that consume 1/3 to 2/3 of their total annual
energy on hair drying</font>, I would absolutely advocate banning
them. On the other hand, as hair driers consume a trivial proportion
of annual energy and people dont conspire to run them all together
for hours at a time during specific time periods, banning them
really wont make a difference to the grid. Completely unlike space
heating.<br>
<br>
Electric hot water heaters, on the other hand, approach the
importance of space heating, and in very efficient houses in mild
climates, hot water production can be as important to annual heat
use. In those situations, again, we would ask "are there affordable
methods of reducing that demand?" and try to implement. We have the
advantage that time shifting is more likely to be useful and thus
smart grid feedback approaches can make a bigger difference to the
grid than the same approach for space heating. There may indeed
come a time when it will be as easy and affordable to ban electric
water heaters as it is to ban electric resistance heating is today,
but that will probably be 5 to 20 years off is my guess.<br>
<br>
<pre class="moz-signature" cols="0">Dr John Straube, P.Eng.
<a class="moz-txt-link-abbreviated" href="http://www.BuildingScience.com">www.BuildingScience.com</a></pre>
<br>
On 11-12-17 12:06 PM, Reuben Deumling wrote:
<blockquote
cite="mid:CAE5fceBPsiCjPsXh_DcS-AAHYFnZfooUSxQUaxPUrtMiOD7JCQ@mail.gmail.com"
type="cite"><br>
<br>
<div class="gmail_quote">On Sat, Dec 17, 2011 at 6:37 AM, John
Straube <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:jfstraube@gmail.com">jfstraube@gmail.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000"> banning 1500W heaters
in buidings would be a good way to reduce peak demand on the
grid.<br>
</div>
</blockquote>
<div><br>
And I'd hope that included all resistive loads (hair dryer,
clothes dryer, electric water heater, etc.). Right? The grid
doesn't much care what the purpose of the resistive load is,
or even if it is a resistive load, for that matter.<br>
</div>
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</blockquote>
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