DIY Solar Concentrator: Difference between revisions
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=Parabolic Evacuated Tube= | =Parabolic Evacuated Tube= | ||
*http://www.ffwdm.com/solar/solar-index.htm - $110 USD per kW of heat? | *http://www.ffwdm.com/solar/solar-index.htm - $110 USD per kW of heat? | ||
:* Ut this requires replacement of insides with a u- copper tube, which is a valiant effort. Tbis is because evacuated tubes have a closed heat exchanger mechanism - a closed copper tube with heat exchanger bulb. | |||
:*Unless one can find low cost u-tube heat exchangers, the evacuated system appears to be too complicated compared to plain black tubes. | |||
==BOM== | ==BOM== | ||
*$25 per 6 foot evacuated Tube, no inner tube - water directly in glass? - [https://www.ebay.com/itm/solar-hot-water-heater-vacuum-tubes-30-tube-sets-free-pick-up-California-/273691205462] - affordable. | *$25 per 6 foot evacuated Tube, no inner tube - water directly in glass? - [https://www.ebay.com/itm/solar-hot-water-heater-vacuum-tubes-30-tube-sets-free-pick-up-California-/273691205462] - affordable. | ||
Revision as of 16:43, 17 February 2019
Parabolic Evacuated Tube
- http://www.ffwdm.com/solar/solar-index.htm - $110 USD per kW of heat?
- Ut this requires replacement of insides with a u- copper tube, which is a valiant effort. Tbis is because evacuated tubes have a closed heat exchanger mechanism - a closed copper tube with heat exchanger bulb.
- Unless one can find low cost u-tube heat exchangers, the evacuated system appears to be too complicated compared to plain black tubes.
BOM
- $25 per 6 foot evacuated Tube, no inner tube - water directly in glass? - [1] - affordable.