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Re: Solar water heating system value - Page 32

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Posted by David Hansen on March 13, 2006, 7:33 am
 
On 12 Mar 2006 19:09:06 -0800 someone who may be meow2222@care2.com
wrote this:-


People can draw their own conclusions from that assertion.


Excellent, more personal abuse.


  David Hansen, Edinburgh
 I will *always* explain revoked encryption keys, unless RIP prevents me
 http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

Posted by meow2222 on March 13, 2006, 7:40 pm
 
David Hansen wrote:

saying that what you said was stating the obvious is not personal abuse



Did I miss it? What is your figure for the annual saving of a typical
commercial DSHW system, and how do you arrive at that figure?


NT


Posted by Rob Dekker on March 13, 2006, 10:00 pm
 
[...]

OK. Since I caused the confusion, let me explain why I thought that the cost (or
savings; sorry for the misunderstanding) was
extremely low :

Here is a 'saving' calculator for DHW :
http://www.infinitepower.org/calc_waterheating.htm

I have a 1-family home, using a 50 gallon tank with about 65% overall
efficiency, using about 60 gallons HW per day. Gas-powered.
Northern California natural gas price (retail) is around $.50 / therm.
So, I see DHW cost of about $50/year. That seems right extrapolating my summer
gas bills (when I use gas only for HW).

Now, expected savings using solar DHW should be beteen 50% and 80% of DHW usage
(seen this at various web-sites).
So I should save between $75 to $80/year.
And note that I an on the low-end of the consumption scale, using nat gas for
DHW in a small household, using front-loader European
washer, and water-saving shower heads and such. Most people use a lot more than
me, and many use electric DHW heaters, which
essentially double the cost.

So, once again : how did you get to savings of just 20 / year ?

Rob



Posted by David Hansen on March 14, 2006, 12:53 pm
 On 13 Mar 2006 11:40:44 -0800 someone who may be meow2222@care2.com
wrote this:-


See this or another thread running at the moment.


--
  David Hansen, Edinburgh
 I will *always* explain revoked encryption keys, unless RIP prevents me
 http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

Posted by meow2222 on March 10, 2006, 3:12 am
 Rob Dekker wrote:


PS maybe 'mericans arent familiar with the fact that British washing
machines dont use a hot water feed.

NT


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