[RE-wrenches] SWH data logging

[Carl Adams]

Kelly,

I have installed several of the Metrima BTU/KWH meters for SHW.  The kit
comes with a flowmeter, temperature sensors and wells (hot and cold), and a
calculator, nicely integrated.  These are utility grade meters and more
economical than the hardware you mentioned(dealer price $425).  Check out
TCT Solar ( http://www.tctsolar.com/ the US distributor).  The only downside
is that the units are BSP thread ( adapters to NPT are provided in the kit
to drop the temperature wells and the flow meter into a 3/4" NPT line).  I
guess if we deployed more of these in the US we'd have NPT as a standard
option.  Another use I've found for these units is they allow me to
adjustment for offsets in the tank temperature sensor vs the actual hot
water temperature ( 2 - 10 degrees typical), and adjust the high limit set
point accordingly.  I like the fact that customers can look at the kWh of
energy delivered by the SHW system and easily convert to $$savings.  Larger
units are available for higher flow rates/pipe sizes.

Cheers
Carl


On Fri, Nov 14, 2008 at 9:50 AM, Kelly Keilwitz, Whidbey Sun & Wind <
kelly at whidbeysunwind.com> wrote:

> Thermal wrenches,
> We have a customer who wants to log the energy gain of his SHW system.
> The only viable option we've found is by Resol (also rebranded by Caleffi)
> which includes their top-line controller (~$280) in conjunction with their
> data logger, DL-2 ($500). With markup and installation this system will
> cost
> our customer over $1K.
>
> Are there any other AFFORDABLE options out there, that include data logging
> to a computer or web interface?
>
> Thanks,
> -Kelly
>
> Kelly Keilwitz, P.E.
> Whidbey Sun & Wind, LLC
> Renewable Energy Systems
> NABCEP Certified PV Installer
> 987 Wanamaker Rd,
> Coupeville, WA 98239
> PH & FAX 360-678-7131
> sunwind at whidbeysunwind.com
>
>
>
>
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