[Greenbuilding] is it ever sensible to use PV to heat water?

[Carmine Vasile]

Please Define efficiency with respect to this comment: "
Though I think you may mean electric resistance (not PVs) PVs, depending on the type, are more like 10% efficient, not 100%." Source energy is about 3:1 if the source is an oil-fired power plant. If it's the Sun, it's less than 10% because PV's are still very inefficient; despite decades of empty promises.Regarding this comment "Why don't you work on a little energy efficiency?"; my invention is being used  to recycle energy from wastewater in thousands of homes --including mine; Army Barracks, College Dorms, restaurants, etc. . Do I get credit for that?Carminegfxtechnology.com

> Date: Tue, 20 Mar 2012 19:42:07 -0400
> From: larencorie at axilar.net
> To: greenbuilding at lists.bioenergylists.org
> Subject: Re: [Greenbuilding] is it ever sensible to use PV to heat water?
> 
> From: Carmine Vasile <gfx-ch at msn.com>
> 
> > Since a PV system is nearly 100% efficient for electric
> > space & water heating,
> 
> Hi Carmine;
> 
> Though I think you may mean electric resistance (not PVs)
> PVs, depending on the type, are more like 10% efficient, not 100%
> 
> > We live in an all-electric house and use about 20 MWh/yr.
> 
> Yikes!  That is about 17 time as much as I use, and I don't
> use any fossil fuel either, in a very cold climate (that
> includes for lawn care and clearing snow in a very snowy
> climate). You use nearly double what the average American
> household uses. Surely you have an interest in reducing that.
> 
> > Our average monthly bill is $237 -- which is a
> > lot less than my neighbor's oil + electric bill.
> 
> Think about how nice it would be to only have
> to pay about $200 less than that, every month.
> IIRC you do not live in a very cold climate.
> 
> > Unfortunately, our local utility will not offer rebates
> > for a ground-mounted 20 MWy PV array and our roof is
> > too small to fit 20 MHw worth of PV panels.
> 
> Why don't you work on a little energy efficiency?
> It should be easy to reduce your usage by 50-80%
> Your household is virtually hemoraging energy. It
> is bound to cause Summer overheating.   That rate
> of usage is equal to about 7800BTU/hr, about 1-1/2
> time as much heat as runnng the largest plug-in
> electric heater 24/7/52
> 

 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.bioenergylists.org/pipermail/greenbuilding_lists.bioenergylists.org/attachments/20120323/779f11db/attachment.html>