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A large volume of solar heated water e.g 30C is reasonable easy to make, can even use aerobic digestion for the warmth. Getting electricity efficiently from it isn't quite so simple. Might have to vary the pressure of the working fluid to optimise efficiency, and have more than one stage? See what they were doing in the 1950's to 1970's?

If you're not phase changing working fluids, the best you can hope for is Carnot efficiency?

Phase change organic Rankine Cycle Engine with bearing free, near friction free, magnetically mounted turbine? Two drops of oil every week isn't too much? Are you confident to have butane as a working fluid? Diamond or saphire bearings might be much more better than oiled steel. They worked this out about 300 years ago when making watches.

I am wondering how well is Tantalum machinability ??? Nice work fella.

I tip my hat to you Sir. This has to be the best video I have seen on using of the stirling engine for home heating. Am wondering as to where you are located ?? Look forward to see more great videos and ideas of giving the average person control of heating costs. I have an idea of maybe using magnetism somehow to increase the energy output ?? Job well done Sir too. Peace v

Hello, nice work, I like your approaches in your work. I have two question, what material is the heater made of and why did you choose this material? Another question 😅 are you german? Thanks

Do you need more cooling from the cold part? maybe with a close cycle?

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I agree that the production on a budget is challenging. However it might be possible to find a type of cryo cooler that can be reversed to generate heat and repurpose it. I am not sure if you have to put heat into the cold finger or the cooling waist but running it backwards would be a great idea. Smaller units have sold on eBay for hundreds of dollars but prices have gone up over the years so they may no longer be bargains. Finding a Eastern vendor who would be prepared to modify an existing design to make a hobby grade product for a price would be ideal. Even if it is just 100W from a single unit one could poke half a dozen into a fire box. Extracting power from one will not be very difficult as it will provide AC that can be rectified and then used to charge a battery bank as fast as it is able.

I need your help. I'm working on a project to develop a biological solar panel that is part of a whole house resource recycler. I've been tinkering with this for the last decade. There is no new tech needed. Take hold of all of your utilities, water, sewage, electricity and heat, Year round. Grow biomass than is naturally sequester-able. I have my own YT channel and a Patreon if you want to hear more. I don't have any faith for the US government or most govt to do enough. Take matters into your own hand. Keep your fridge running in every rolling blackout, blizzard, and hurricane. Stabilize and recession proof your utility bill.

I just bought 12kw of solar panels for $3100 shipped.

Why dont you just buy a solar panel

Wonder if you could use the biogas to charge a gravity battery. Only just found your channel so apologies if this has already been considered or is just an idea in the wrong direction!

I suggest you use a thermal acoustic pipe that will make a high pitched sound to make power by vibrating piezo electric elements to make power. Where you only need to harvest the energy with a diode bridge and maybe capacitors that dump power into a battery bank once the capacitors are charged.

I saw something about using the flame to heat a sodium mass that will emit a tuned light wave to be collected by a tuned solar panel that will have much more efficiency

I really think peltier is NOT the way to go, proven in the 60s as inefficient.

if you mostly use the biogas directly in an open burner (rocket stove) then it produces direct heat like wood/alcohol stoves without having issues of contaminations. then part of the heat can be used in peltier TEG or steam engines to generate electricity, and rest of the heat is also captured and transferred directly or to water/sand heat storage. by capture I mean that the steam/stirling engine is in the same hot air/water ventilation/pipe room, as the generating engine, so that the hot air/steam output to the steam output is directly outputted to the heat transfer system. how about tesla disc turbine generator for steam, and direct hot burn air and steam water directly as heat output. small tesla turbines are easy to make and maintain. you might also be able to use tesla disc turbine as the burner at the same time as the generator. ie tesla disc turbine is a simpler maintained and made type of the conventional turbine generator burner. you could also gasify wood gas or filter pyrolysis gas or just clean up the methane natural gas. the tesla disc turbine also outputs very cold liquid or ice, so its a compressor heat pump also.

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since your using biogas, why not use an internal combustion engine. a free piston internal combustion engine to be precise. you will have less moving parts. if corrosion is an issue then you will only replace less parts. i think the challenge for this engine is making your own solenoid valve as it will be controlled electronically. th-cam.com/video/u4b0_6byuFU/w-d-xo.htmlsi=-xJbl74cjKfBPvRT

Have you ever Heard about the ST05G? A 500W Alpha Stirling building kit with integrated Generator? For a few your ago, you can buy this building kit in germany.

Can't the biogas be filtered and clean to a degree that the ICE won't degrade? If not I think the free piston engine is the go-to. Good luck with the project

Get a pig farm to generate bio-gas - electricity and protein source.

French EURODISH is an alpha type with pressurized He, reaching thermal to mechanical power conversion ratios at 40%

Need to go bigger...industrial scale, or flop.

Love your videos. Check out qnergy. They use free piston sterling and use pig wast to gen gass to run

Greetings, Earthling! I come in peace. Have you considered using AI to reshape the parts? Reduce mass, maintain strength. I think it's worth a try.

Is relative anonymity important to you, or could you elaborate on how you came to your cutting-edge hobby?

Interesting, we seems to have very similar ideas. I looked into the same issue and came up with the same pros and cons. In the pursuit of low maintenance, I'm convinced that a sacrifice of efficiency is inevitable. A very simple system would be a boiler connected to a steam turbine - not as complex multi-staged one as the ones used in power plants like you showed, but perhaps a modified turbo charger is a good start to evaluate how much efficiency we leave on the table. The whining noise can probably be dampened to neighbour-friendly levels through a brick construction, perhaps with a double wall filled with fine sand to get a very dense enclosure. The upside would be that the setup can be both flexible (the turbine can be placed in many different places around the boiler), compact and mechanically simple (only two moving parts - the turbine and the electric generator connected to the output shaft - perhaps with a belt to avoid having to exactly align the shafts, but that's about it). I'd say it's worth a shot, but I admit I have not done any math nor experimentation on this and there is very little precedent to be found online.

build a nuclear reactor.

BAM-TiB is nearly as hard as carbide or diamond and is the slipperiest mechanical material of all. Couldn't you beat the corrosion problem with this and just go with a low-compression IC?

Running on air a Stirling engine cannot be made efficient due to relatively high viscosity of air. To dramatically increase the power produced so that you don't have to worry so much about friction, the working gas has to be Hydrogen or even better, Helium. Also further increase in performance will be achieved if you can run the working gas under pressure. With these improvement you can get very close to the ideal Stirling cycle, you can't do it with air, especially under atmospheric pressure. Your undoubted designing talents can be better used if you move in this direction rather than fine-tuning seals and balancing movements. Returns from those improvements are really minute.

Throw the whole assembly in a vacuum chamber instead of flame wicking the heat exchanger

Stirling cycles mag wheel swap out the armature for a turbine and levitate it between your perm magnets for almost no torque

Use the sterling cycle to drive a mag wheel.

I was thinking of alternative things. In the end a regular single cylinder generator for all the big power draws and solar for the small power draws has been fine for 13 years now. I have an overhead water tank that gets filled when I do the washing.

What i did is modify a old diesel engine to run on woodgas I have a tar free gasiffier design to so the thing is spotless it produces 5 kw/h (derating is 20%)

If your current rhombic produces 300 W, can you not put six or seven in series on a common crankshaft? Perhaps it then becomes a question of producing enough biogas to feed them? Perhaps you could explain better what you mean by service interval? Do you mean refueling? Cleaning out? Replacing parts? These are very differing levels of concern.

For what it's worth, if you choose to go with a conventional I/C engine, you can add automotive water injection in order to control and eliminate the by-products of the dirty fuel, along with adding power and efficiency due to the mist flashing into steam. If you want to try an easy turbine style look into the Tesla turbine which uses no complex blades, and is quite easy to machine. For a large, inexpensive diaphragm, they can be found used in large truck brake canisters. If adding a generator to a battery based Renewable Energy System, for best efficiency, match the generator/charger output to the ability of the battery to accept the charge. For example, if you have a Lead Acid battery, they have a C/10 best charging rate. Therefore if you have a 1000 Amp hour battery you should charge at a maximum of 1000Ah÷10=100Amps. Different battery chemistries have different optimal charge rates. Thank you for sharing your experiments with us, it is very interesting. I have not seen all of your videos, and I'm curious what excessive maintenance is causing you to abandon this project to charge your system?

An wot stops these engines from over accelerating they Just start running an Get faster an faster ? An boom,!!

Great video ,have you tried a vacuum engine or also called a flame eater ,a type of heat engine .the main problem with heat engines is when you size them up they are less efficient, so why not use more than one smaller engine .cheers

The solution is to enact multiple solutions to overcome analysis paralysis. From there, optimize and refine.

I hope there is one more hopeful alternative for future domestic electricity generation. Google "antora energy tpv heat engine"

I've been getting an itch to build a rhombic drive and I decided to watch all your videos from the beginning to in sequence. It seems you had put so much effort into getting this to work and I thought you where making progress. It's a bit of a bummer that you're thinking about moving in a different directions. You mentioned your primary reason for abandoning your design was over reliability issues. I understand that part of your constraint is the diy aspect of this with the equipment you have. The question that I ask myself, was did the original phillips engine also suffer from these issues as well. If equipment, time and money, where not the constraint, how would you solve this problem. I don't know if this could be a solution or not but it seems to be that the lower portion of the drive, the linkages, gears etc should be bathed in oil. You mentioned that you needed to keep oil out of the compression area because it would foul up the regenerator. Would there be a way to have a oil sump isolated from the piston/displacer (Bellows perhaps)? Fwiw.. I don't exactly understand how your regenerator works. I saw a couple other designs where the displacer was also the regenerator, which is not the case in your design.... Was there a video where you talked about your regenerator and I just missed it? It sounded like you had many technical challenges with the compression cylinder.... How do the big boys do it.. It sounds like you might be moving to a free piston design, would those piston issues carry over to that design as well?

Free piston nasa version also helium as working gas

Steam is a better option if your going to use a gas or biomass fuel. Best option for long term continuous operating would be a turbine since the only moving part is the rotor shaft & bearings. You can make the rotors using thin lamnations welded together to create simple impulse rotors.

free pistons can potentially provide a much greater surface area and compression. It can also run at way higher pressures, altering the PV graph thus increasing the efficiency.

I discovered your channel a couple of days ago, and I've been watching your 10 year journey in order from the beginning. I really appreciate your willingness to document not only your successes but your failures as well. It is really quite inspirational to watch since I can see you are getting closer to your goals. At this point of watching your videos, I wonder why you haven't explored casting. It seems that casting, who save you time and effort on your main housing. I'm thinking you could 3d print the part use it like investment a pattern in an investments casting. Also, I'm wondering why you haven't gone down the wire edm path... 3 months of video to go. On a side note, I've been experimenting with making a LTD stirling for fun... So far without much success, but you are inspiring me. Rhombic Stirlings are very fascinating to me. I have this idea in my head to make a small generator that I can take camping to make power when the sun doesn't shine. Gut gemacht!

You may be interested in getting in contact with Charlie Solis from Testur energy. He is developping an aliminium foil Tesla Turbine that has been shown to be able to produce up to 4 kW outputs. He is developing this exactly for energy independence, your micro biogas system is exactly the kind of energy sources he has in mind. You know TH-cam deletes any message with links on it but search TH-cam for Charlie Solis Tesla Turbine channel.

What about Fluid Stirling Engine? I think they are for you the best choice