Pv for s/h/w..... [RE-wrenches]

[James Lamb, Middle Fork Engineering]

Kurt
Rise in temperature for 1 KWH of power for a 80 gallon tank =
   3413 BTU/KWH /(80 gallons of water x 8.66 lbs/Gal)  =  4.9 degrees F

Note that 1 KWH of power is equal to 3413 btu 

Its very expensive to heat with electricity
Thas why gas or the sun for heating of water is cheaper.
JIM LAMB 
Middlefork Engineering




-----Original Message-----
From: sunwise at cheqnet.net [mailto:sunwise at cheqnet.net]
Sent: Thursday, May 09, 2002 2:20 PM
To: RE-wrenches at topica.com
Subject: RE: Re: Pv for s/h/w..... [RE-wrenches]




Original Message:
-----------------
From: Smitty smitty at aaasolar.com
Date: Thu, 09 May 2002 10:39:41 -0600
To: RE-wrenches at topica.com
Subject: Re: Pv for s/h/w..... [RE-wrenches]


Kurt, I think in some cases a diversion load is ok, but I basically agree
with Tom. Solar thermal is way more cost effective.

Yes, way more efficient but if the home owners are using the water at night
and during the early morning prior to going to work, all they are getting
out of that big flat-plate collector is one tempering tank of water.  Maybe
I should be sizing the T-tank bigger, but at say 80 gallons of storage, and
primarily night time/morning usage, a couple hundred watts of PV might heat
80 gallons during a sunny day and it would be less expensive (materials and
labor) than doing it with solar thermal.  The component list for such a
system would be very short.  Using a 200 watt PV, lets call it 1KWH a day,
how much temperature rise would 80 gallons of 48 degree well water see?
Anyone care to do the math on that?

Kurt Nelson

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