Hillbilly Heater: Difference between revisions
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*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] | *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] | ||
*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] | *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] | ||
=System Goals= | |||
Exchange Solar heat to aquarium water. | |||
=Efficiency= | |||
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? | |||
Revision as of 00:06, 11 November 2016
Industry Standards
- Hillbilly heater - 20 sf or 2 sq meters per 500' roll of tubing - $75 - [1]
- Amazon - 4 sf - $124 - [2]
- Evacuated tube - 5 sf - $179 + $230 ship - [3]
- Evacuated - $670 - 15 sf - [4]
System Goals
Exchange Solar heat to aquarium water.
Efficiency
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?