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Posted by nicksanspam on March 23, 2007, 10:05 am
 


I meant, "Who makes a package that automatically measures
the flow rate and multiplies by the temp diff?"



Posted by Christian Kaiser on March 23, 2007, 3:49 pm
 
Technische Alternative.

See http://www.invest-tools.com/pub/solsys/ , Goto "DHW system", "Control".
Might be a bit overkill just to measure the energy, but maybe you can need
other features also.

Christian



Posted by DJ on March 24, 2007, 12:41 am
 On Mar 22, 7:55 am, nicksans...@ece.villanova.edu wrote:

Same folks sell alot of the parts, but not as a complete assembly, I
think.

And that does add quite a few more bucks, as you're getting into
industrial applications, especially if you get into magnetic field
flow meters (non-intrusive) or impeller versions with v or ma
outputs.

The convenient thing about solar thermal pumps is that, normally,
they're not variable speed, they're on/off. And since this unit powers
the pump (or powers the relay that  starts the pump), it knows when
it's running and not.

DJ


Posted by nicksanspam on March 24, 2007, 5:28 am
 

One Florida utility installs solar water heaters and measures their output
in kWh for billing. IIRC, a Swedish company makes their meters. Also, some
apartments are submetered for heat and hot water consumption, so it seems
to me that at least one company sells complete packages to do this.

Nick


Posted by Jeff on March 24, 2007, 1:38 pm
 nicksanspam@ece.villanova.edu wrote:

   What exactly are they billing for? We've all been thinking flow rate,
but to measure the total flow is long established technology, every
house has a water meter on their mains. You can make assumptions about
the water temperature just like the gas company gives an average BTU
content per cubic foot. If you wanted to know the instananeous BTU
content what would they reference the starting temperature with? The
temerature of ground water? The incoming collector water temperature? Or
the ambient air temperature? Or just some fixed standard temperature?

   It may be easier and certainly cheaper for the OP to just sample
these readings a few time a day and calculate. It's not major math.

   Jeff


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