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Posted by SJC on February 26, 2006, 6:31 am
 


  Maybe I am oversimplifying, but I would just know how much water
is stored in my system, measure temperature in the morning and in the
afternoon. 10,000 pounds of water raised X degrees is Y BTUs.


Posted by daestrom on February 26, 2006, 3:26 pm
 



  Maybe I am oversimplifying, but I would just know how much water
is stored in my system, measure temperature in the morning and in the
afternoon. 10,000 pounds of water raised X degrees is Y BTUs.

Your method would work, if you don't use any heat during the day.
Otherwise, you'd be underestimating how much heat you've collected by
however much heat used between morning and afternoon.

But some of us just like to 'tinker' anyway ;-)

daestrom


Posted by Steve Shantz on February 26, 2006, 7:39 pm
 I would echo Daestrom.  Additionally, your tank will be stratified,
with hotest water at the top and coldest at the bottom.  You cannot
really know the total amount of heat in your system by measuring just
at the top.
Example:  If you get one hour of good sun, and the rest of the day goes
bad, you will have a bit of hot water at the top of your tank, but it
is not neccessarily representative of the state of the whole tank.

Besides... some of use are born to tinker!

Steve


Posted by daestrom on February 26, 2006, 3:24 pm
 

Some of GEMS sensors provide a pulse output as the turbine spins (hall
effect units).  I've interfaced that with Dallas Semiconductor's 'One-wire'
counter device.  Then I simply read the counter with my PC periodically and
the count is proportional to the gallons that have passed through the
turbine.  The 1-wire devices are pretty slick and interface with a USB
device.  If you can hack your own software, you can do quite a lot with
them.

daestrom


Posted by schooner on February 26, 2006, 3:28 pm
 daestrom - What all 1-wire sensors are you using?
I've been using the temp sensors and data loggers so far on my solar
collector.  Great devices but as you say the software is lacking so best if
you can roll your own.



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