DIY Solar Concentrator - Revision history

Marcin: /* Calculations */

2019-02-17T19:51:58Z

Calculations

← Older revision		Revision as of 19:51, 17 February 2019
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	*We need 482K, or 1.33x this K		*We need 482K, or 1.33x this K
	*1.33^4 = 3.1 - so only 3x concentration is needed if there were no other losses		*1.33^4 = 3.1 - so only 3x concentration is needed if there were no other losses
			*Convective loss calculator - [https://www.engineersedge.com/heat_transfer/convection.htm]

	=Links=		=Links=
	*Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [https://academic.oup.com/ijlct/article/9/3/214/808795#14051557]		*Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [https://academic.oup.com/ijlct/article/9/3/214/808795#14051557]

Eric: Minor Text Formating Fix

2019-02-17T19:23:25Z

Minor Text Formating Fix

← Older revision		Revision as of 19:23, 17 February 2019
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	=Existing Open Source Designs=		=Existing Open Source Designs=
	==OSE France's Design==		==OSE France's Design==
	*[Whats the deal with OSE France's main page, http://www.opensourceecologie.org/ ? As of 2/17/19 ~19:20 it appears to be down]		*Whats the deal with OSE France's main page, http://www.opensourceecologie.org/ ? As of 2/17/19 ~19:20 it appears to be down
	*[https://www.instructables.com/id/Solar-OSE-Solar-concentrator-for-steam-generation/ The instructable for this]		*[https://www.instructables.com/id/Solar-OSE-Solar-concentrator-for-steam-generation/ The instructable for this]

Eric: Added some more information

2019-02-17T19:22:34Z

Added some more information

← Older revision		Revision as of 19:22, 17 February 2019
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			=Existing Open Source Designs=
			==OSE France's Design==
			*[Whats the deal with OSE France's main page, http://www.opensourceecologie.org/ ? As of 2/17/19 ~19:20 it appears to be down]
			*[https://www.instructables.com/id/Solar-OSE-Solar-concentrator-for-steam-generation/ The instructable for this]

	=Parabolic Tube=		=Parabolic 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?

Marcin: /* Calculations */

2019-02-17T19:04:08Z

Calculations

← Older revision		Revision as of 19:04, 17 February 2019
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	*We need T to be 1.3x this		*We need T to be 1.3x this
	*We need 482K, or 1.33x this K		*We need 482K, or 1.33x this K
	*1.33^4 = 3.1 - so only 3x concentration is needed		*1.33^4 = 3.1 - so only 3x concentration is needed if there were no other losses

	=Links=		=Links=
	*Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [https://academic.oup.com/ijlct/article/9/3/214/808795#14051557]		*Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [https://academic.oup.com/ijlct/article/9/3/214/808795#14051557]

Marcin: /* Calculations */

2019-02-17T19:03:28Z

Calculations

← Older revision		Revision as of 19:03, 17 February 2019
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	*90C = 363K. Double to 726K - max 450C.		*90C = 363K. Double to 726K - max 450C.
	*At this point, conduction and convection play a good role.		*At this point, conduction and convection play a good role.
	*		*We need T to be 1.3x this
			*We need 482K, or 1.33x this K
			*1.33^4 = 3.1 - so only 3x concentration is needed

	=Links=		=Links=
	*Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [https://academic.oup.com/ijlct/article/9/3/214/808795#14051557]		*Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [https://academic.oup.com/ijlct/article/9/3/214/808795#14051557]

Marcin: /* Calculations */

2019-02-17T18:56:25Z

Calculations

← Older revision		Revision as of 18:56, 17 February 2019
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	*Max T that a metal can get when in full sun in 90C - see nice explanation at [https://physics.stackexchange.com/questions/186910/how-hot-can-metal-get-in-sunlight] combined with Stefan Boltzmann constant - [https://en.m.wikipedia.org/wiki/Stefan–Boltzmann_constant]		*Max T that a metal can get when in full sun in 90C - see nice explanation at [https://physics.stackexchange.com/questions/186910/how-hot-can-metal-get-in-sunlight] combined with Stefan Boltzmann constant - [https://en.m.wikipedia.org/wiki/Stefan–Boltzmann_constant]
	*So we see that the max temp in K varies as the 4th root of power density hitting the object. For example, to double the temp in K, need 16x solar concentration.		*So we see that the max temp in K varies as the 4th root of power density hitting the object. For example, to double the temp in K, need 16x solar concentration.
	*90C =		*90C = 363K. Double to 726K - max 450C.
			*At this point, conduction and convection play a good role.
			*

	=Links=		=Links=
	*Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [https://academic.oup.com/ijlct/article/9/3/214/808795#14051557]		*Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [https://academic.oup.com/ijlct/article/9/3/214/808795#14051557]

Marcin: /* Calculations */

2019-02-17T18:49:51Z

Calculations

← Older revision		Revision as of 18:49, 17 February 2019
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	=Calculations=		=Calculations=
	*Max T that a metal can get when in full sun in 90C - see nice explanation at [https://physics.stackexchange.com/questions/186910/how-hot-can-metal-get-in-sunlight] combined with Stefan Boltzmann constant - [https://en.m.wikipedia.org/wiki/Stefan–Boltzmann_constant]		*Max T that a metal can get when in full sun in 90C - see nice explanation at [https://physics.stackexchange.com/questions/186910/how-hot-can-metal-get-in-sunlight] combined with Stefan Boltzmann constant - [https://en.m.wikipedia.org/wiki/Stefan–Boltzmann_constant]
			*So we see that the max temp in K varies as the 4th root of power density hitting the object. For example, to double the temp in K, need 16x solar concentration.
			*90C =

	=Links=		=Links=
	*Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [https://academic.oup.com/ijlct/article/9/3/214/808795#14051557]		*Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [https://academic.oup.com/ijlct/article/9/3/214/808795#14051557]

Marcin: /* BOM */

2019-02-17T18:46:08Z

BOM

← Older revision		Revision as of 18:46, 17 February 2019
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	==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.

			=Calculations=
			*Max T that a metal can get when in full sun in 90C - see nice explanation at [https://physics.stackexchange.com/questions/186910/how-hot-can-metal-get-in-sunlight] combined with Stefan Boltzmann constant - [https://en.m.wikipedia.org/wiki/Stefan–Boltzmann_constant]

	=Links=		=Links=
	*Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [https://academic.oup.com/ijlct/article/9/3/214/808795#14051557]		*Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [https://academic.oup.com/ijlct/article/9/3/214/808795#14051557]

Marcin: /* Parabolic Tube */

2019-02-17T18:15:06Z

Parabolic Tube

← Older revision		Revision as of 18:15, 17 February 2019
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	=Parabolic Tube=		=Parabolic 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.		:*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.		:*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==		==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.

Marcin: /* BOM */

2019-02-17T18:13:40Z

BOM

← Older revision		Revision as of 18:13, 17 February 2019
Line 5:		Line 5:
	==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.

			=Links=
			*Paper on Medium Temperature Concentrators - overview for tech up to 250C. We need 200C for saturated water. [https://academic.oup.com/ijlct/article/9/3/214/808795#14051557]