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Best use of extruded rubber pool collectors - Page 2

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Posted by Gary on October 14, 2004, 7:35 pm
 


Long runs of collector will result in higher average collector
temperatures.  This increases the temperature of the water coming out,
but also increases losses (particularly from unglazed collectors).
So, I think that long runs are bad if you want good efficiency.
Several parallel runs that produce a modest temperature increase
should be more efficient.


If you want to look at numbers, this link has free pool simulation
software:
http://www.canren.gc.ca/tech_appl/index.asp?CaID=5&PgIDH4
If you use the "pro" version (still free), it allows you to change the
configuration of the collectors -- you should be able to run series
and parallel arrangements and see how big the differences are.
I think that you will need to download a TMY weather file for your
area, or some similar area.  This NREL site:
http://rredc.nrel.gov/solar/old_data/nsrdb/tmy2/
has files for the US.

This site seems to have a lot of pool heating info:
http://www.powermat.com/

Gary

Posted by N. Thornton on October 18, 2004, 1:47 pm
 

It depends what youre comparing.

If you compared the same flow rates /within each section/, which does
mean very different rates at the pump, then what you say would be
true. But IRL we want to compare the 2 layouts with the same pump, not
series with small pump vs parallel with big pump. For a given pump
flowrate, the gain would be the same with either configuration. That
means a lower flow rate in each parallelled bit.

The only thing that will change the relative efficiency of the 2
setups is flow rate, and parallel will give you higher total flow rate
with the same pump, as the parallelled flow resistances are less.

NT

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