Revision as of 18:15, 17 February 2019

Parabolic Tube

But 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.
Does not appear highly relevant to saturated water storage.

$25 per 6 foot evacuated Tube, no inner tube - water directly in glass? - [1] - affordable.

Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [2]

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 =Parabolic 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.
+:*But 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.
+:*Does not appear highly relevant to saturated water storage.
 ==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.