<html>
<head>
<meta content="text/html; charset=ISO-8859-1"
http-equiv="Content-Type">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<font face="Helvetica, Arial, sans-serif">Paybacks make no sense
unless we know the cost of energy and the cost of the product.<br>
As an example, in Germany the Bosch </font>
<meta http-equiv="content-type" content="text/html;
charset=ISO-8859-1">
WTW86560 costs about $2000-2200. This is a lot. But electricity
costs 20 cents a kWh and this would save 650 kWh/yr ($130) for a
normal family of four relative to an electric dryer. If the
electric drier is $500, then the payback is more like 12 years
assuming electric prices never go up (not a good bet). <br>
If this product was available in Long Island New York, the payback
would be better, in the order of 10 years.<br>
Given that the average clothes drier lasts around 15 years, it makes
sense in these situations. It would not make sense economically in
areas with 6 cent power or the national average of 12 cents or so.<br>
I would buy one for the same reason some people buy Prius' : it is
not payback, but the desire to harm the environment less if I can
afford to.<br>
<br>
It is odd to have a discussion on payback when others are saying we
should not even consider using clothes driers as it is always dry
and sunny outside when they do their laundry!<br>
<br>
<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>
<br>
On 12-07-22 5:35 PM, Benjamin Pratt wrote:
<blockquote
cite="mid:CABCPgAXDrj_FQ5zojKQ-k7RPib2ysjgOW8HkXJ6sEqtnJz=37Q@mail.gmail.com"
type="cite">
<pre wrap="">Quick google search found this nice little paper on the subject of
heat pump clothes dyers
<a class="moz-txt-link-freetext" href="http://eec.ucdavis.edu/aceee/2010/data/papers/2224.pdf">http://eec.ucdavis.edu/aceee/2010/data/papers/2224.pdf</a>
With a payback period of at least 27 years, they are hard to justify.
However, I would expect the payback to be shorter if energy prices
rise (although I only skimmed the paper so I don't know if the author
took that into account).
OF course, hybrid cars are popular, and their payback period takes
many years. But I suspect that clothes dyers don't have the appeal, or
express one's values, as much as a Prius does.
-Ben
On Sun, Jul 22, 2012 at 3:29 PM, John Straube <a class="moz-txt-link-rfc2396E" href="mailto:jfstraube@gmail.com"><jfstraube@gmail.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">Heat pump condensing clothes driers have ratings of around 250 kWh per year vs 900 for straight electric. These use almost 1/4 as much energy.
You just can't buy them here. They are available in Australia Scandinavian europe japan.
Sent wirelessly from my BlackBerry device on the Bell network.
</pre>
</blockquote>
<pre wrap="">
</pre>
</blockquote>
</body>
</html>