Revision as of 19:56, 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. 12kW

$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?

@@ Line 2: / Line 2: @@
 *Hillbilly heater - 30 sf or 2 sq meters per 500' roll of 1/2" tubing if tubing has .7" OD - $62 - [https://www.menards.com/main/outdoors/watering-irrigation/polypipe/1-2-100-psi-irrigation-pipe-yellow-label/p-1444431569240.htm](note: special order, but 100' sections are in stock). OD is .712".
 :*Compare to 3/4" tubing - $72 for 500' roll- [https://www.menards.com/main/outdoors/watering-irrigation/polypipe/3-4-100-psi-irrigation-pipe-yellow-label/p-1444431568981.htm], 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. 12kW
 *Amazon - 4 sf - $124 - [https://www.amazon.com/SW-38-Solar-Water-Heater-Panels/dp/B0041VM58E]
 *Evacuated tube - 5 sf - $179 + $230 ship - [http://www.ebay.com/itm/10-Evacuated-Tubes-Solar-Collector-of-Solar-Hot-Water-Heater-Vacuum-Tube/272110504741?_trksid=p2141725.c100338.m3726&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20150313114020%26meid%3D325f30ec2c5d474488e1cd3aaa7363ab%26pid%3D100338%26rk%3D9%26rkt%3D29%26mehot%3Dpp%26sd%3D331878211226]