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Author Topic: Is there an economical way to turn heat into 240v electricity,at usable current?  (Read 5023 times)
Hero Member
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« Reply #15 on: September 12, 2013, 07:44:21 AM »

Re wasted.

Sorry, I was referring to the by-product of the typical biodiesel process.  Yes, it can be used but so also could all the original oil in many cases.  It is a by-product because the 'customer and exercise' mob would not want to make it too easy for using any old oil for road use.  Simply reducing the viscosity, by thinning or heating, is enough to protect the injection gear and allow atomisation at the injector end.

Semi-diesels such as the old Lantz will consume most any hydrocarbon oil one feeds it. It was one of their strong points.


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« Reply #16 on: September 12, 2013, 11:58:40 PM »

How about a flash boiler as used in the Stanley steam car? I believe they are fairly simple, made of a coil of steel tube which is heated by the combustion flames. Cold water is pumped into the hot tube, which 'flashes' into steam, at the rate required to supply the engine  with its immediate need for steam. Because there is no significant quantity of stored high pressure water and steam, they're much safer than conventional boilers.

I think a problem would be the tube scaling up, unless a condensor and closed cycle were used with de-ionized water for topping up. I'm sure there's lots of info available from the Stanley enthusiasts - and renewablejohn.

Brian H
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« Reply #17 on: September 13, 2013, 09:14:04 AM »

Flash boilers also appear to be described as monotube boilers, there's quite a few how-tos on them.
DaS Energy
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« Reply #18 on: September 13, 2013, 10:28:05 AM »

Hello Julian,

From reading the posts it appears you be more comfortable with steam than other energy sources.

The worlds most efficient piston steam uses a liquid piston and hydro turbine crankshaft, the efficiency of these is from 60% to 91% depending on model of choice.

The DaS Valve attached in fact is a positive action pump. It has a fail safe self filling boiler.

The system works with the pumped water passing through the hydro turbine and into a holding tank that refills the boiler.

Home build is cut and weld of pipe including the turbine. In choosing the pipe select of grade sufficient for the pressure you intend to generate.

Whatever diameter pipe, and volume you choose (obtained by height) follow the picture for construction.

Liquids of a lower heat need to boil may be used without any mechanical change needed.

Wattage output based on a Francis turbine (82% efficiency) you need one litre of water at 9 bar pressure per second to produce 720 watts. Steam at 9 bar pressure requires it be at +176*C.

* DaS Valve.png (15.28 KB, 890x529 - viewed 313 times.)
« Last Edit: September 13, 2013, 10:52:12 AM by DaS Energy » Logged
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« Reply #19 on: October 01, 2013, 11:10:56 PM »

You can see a wood fired Stirling engine on youtube, they are good technology, but no one manufactures them off the shelf. Exept whispergen  and Baxi, but they are multi thousand pound CHP units.

Plus is that a Stirling engine wont explode and burn your face off, and doesn't need constant attention to water levels, and pressure.
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