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11
Heat Engines / Re: Linear solar engine ?
« Last post by CG on September 13, 2022, 10:35:09 pm »
I think the 2 L bottle thing would have a small problem, being that the bottle wall is so thin that some of the expansion volume would be lost due to the walls moving. I think it would need stiffer walls so all the forces would be at the piston.
12
Heat Engines / Re: Linear solar engine ?
« Last post by CG on September 12, 2022, 08:56:23 am »
How about this modification?

Call it a "bent linear solar engine".
13
Heat Engines / Re: Thermo-acoustic demonstration
« Last post by CG on September 11, 2022, 09:06:34 pm »
Yes, I saw that last week. I thought it was pretty neat.
I was thinking of playing with it, when I get some time.
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Heat Engines / Thermo-acoustic demonstration
« Last post by Caleb on September 11, 2022, 08:22:48 pm »
This guy made an interesting video discussing thermo-acoustics

https://youtu.be/abswNCqnMRQ
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Heat Engines / Re: Linear solar engine ?
« Last post by CG on September 11, 2022, 03:02:38 pm »
Reminds me, somewhat, of Minto's wheel.


https://en.m.wikipedia.org/wiki/Minto_wheel
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Heat Engines / Re: Linear solar engine ?
« Last post by Caleb on September 11, 2022, 12:00:39 pm »
I think it could.  A while back I wanted to try a rotary version where the shade (green thing) would cover 2 liter bottles connected to pistons that drive the crank.  But I never tried it out.

17
Heat Engines / Linear solar engine ?
« Last post by CG on September 11, 2022, 11:05:38 am »
Do you think this would work?
Not exactly draw right but it conveys the idea .
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Solar energy / Re: Solar heat storage
« Last post by Caleb on September 09, 2022, 07:52:58 pm »
I went through our gas bills for a year:
Jan 182 CCF
Feb 153 CCF
Mar 109 CCF
Apr 68 CCF
May 18 CCF
Jun 15 CCF
Jul 21 CCF
Aug 91 CCF *
Sep 23 CCF
Oct 46 CCF
Nov 117 CCF
Dec 140 CCF
* Extended power outage; running on generator
During the summer, our gas usage is primarily the water heater which averages out to around 19 CCF/mo
Total heating season (Oct through April) less 19 CCF/mo for water heater = 682 CCF which I believe is equivalent to 20 MW-hr
The sand battery as presented could store 8 MW-hr with the sand at 600 deg C
Just looking at the worst three months (Dec, Jan, Feb) -> 12 MW-hr
So for seasonal heating, we'd need about 1.5 sand batteries as presented (150 tons of sand).  It would take a resistance heater to get temperatures needed to store that amount of heat, so I suppose it would have to come from solar panels.  A 10 kW array operating 6 hours per day during half the year = 11 MW-hr.
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Solar energy / Re: Solar heat storage
« Last post by Caleb on September 09, 2022, 06:16:36 pm »
Sand batteries?  Sounds like geothermal though.

https://youtu.be/G6ZrM-IZlTE
20
Solar energy / Re: 24 hour growing period
« Last post by Caleb on September 09, 2022, 05:50:22 pm »
Would that stress out the plants?  I wouldn't know though because I can't grow a thing.
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