Revision as of 20:04, 17 November 2016

Industry Standards

Hillbilly heater - 30 sf or 2 sq meters per 500' roll of 1/2" tubing if tubing has .7" OD - $62 - [1](note: special order, but 100' sections are in stock). OD is .712".

Compare to 3/4" tubing - $72 for 500' roll- [2], 1" OD. Based on surface area, the 3/4" option is about 20% cheaper, and less work to install. 3/4" should be used, as it saves 30% on installation length for the same power.
Thus: Hillbilly tubing is 30 square feet or about 3 kW of heat capture per 500' coil. 500 feet *12 inches per foot *.7 in (square inches) = 30 square feet. For 3/4", that is 500*12/144 = 40 sf, or 4 sq meters. 4 kW per 500' coil.

$250 cost for 4x8 foot finned collector with CPVC, which works comparably to finned aluminum collector - or $8/sf - [6]

Exchange Solar heat to aquarium water.

Heat transfer is limited by the thermal conductivity of the pipe (PEH ~0.5 W/m K good for plastics).

Is high-pressure system ideal or is a low-pressure gravity system possible using black gutter(s) etc.?

Can water be mixed directly or is thermal mixing a bigger problem?

Can temperature be managed by pump control?

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 *Evacuated - $670 - 15 sf - [https://www.amazon.com/Duda-Solar-Collector-Evacuated-Certified/dp/B00HP846KK/ref=sr_1_10?s=lawn-garden&ie=UTF8&qid=1478787005&sr=1-10&keywords=solar+hot+water]
 ==DIY==
-*$250 cost for 4x8 foot finned collector with CPVC, which works comparably to finned aluminum collector - or $8/sf - [http://www.builditsolar.com/Projects/WaterHeating/CPVCCollector/CPVCCollectorTest.htm]
+*'''$250 cost for 4x8 foot finned collector with CPVC''', which works comparably to finned aluminum collector - or $8/sf - [http://www.builditsolar.com/Projects/WaterHeating/CPVCCollector/CPVCCollectorTest.htm]
 =System Goals=