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2) If you are willing to accept #1, or have a very niche use, the next big thing is not getting the TEG hot, it’s keeping it cool. If you get a true, graphite ‘TEG’, it might reach a red line temp at ~300C / 570F, but the cheaper / generally available ones (ebay) have a limit around 150C / 300F. gas vs electric heat Sure there are places on a stove that hit 300F, but you have to be careful – and consider what the temp is under ‘full fire’. Putting them in a spot that is 300F ‘most of the time’ won’t do. Then one day you decide to light a roaring fire due to bitter cold and melt your TEGs.

3) Next up is consistency. From above, max power likely comes with the hot side close to 300F, and you might run the cold side close to room temp ~70F, but the stove typically won’t run a perfect set temp all the time. You reload, the stove warms up, cruises for a while, then cools back down and reload again. Assuming the cold side (room) is relatively constant at ~70F, that only gives you about 230 degrees of ‘delta T’ to play with and likely the stove will be transitioning through that range almost constantly.

4) Power. Given the narrow operating temp range above, you also have to consider that your TEG cycles from zero to full power in that same range. 3 gases that contribute to the greenhouse effect Any individual TEG will swing from about 0-5V. Very few things will accept such a wide swing in voltage, so then you need a buck/boost power converter. If you need to run something 12V, now you need 3 TEGs in series and they are swinging from 0-15V so that only magnifies the problem.

I would consider reversing that configuration – at least heat sink wise. gas pedal lyrics Reason being – hot is generally no trouble. If you figure a max redline at 300F – a wood stove can do that, large candle could likely do it, kerosene lamp, gas camp stove, etc. You could get the hot side up to full operating temp with a very small heat sink, or likely no heat sink at all… just touch the hot side of the appliance.

You want the cold side to be as cold as possible but you only have ambient air and a fan. So you want all the heat sink area you can get, all the fan power you can spare, etc. That is one slight benefit to these on a wood stove- you want the heat in the house anyway, so if it travels through the TEG and makes a few measly watts of power, all the better.

I’ve wanted to take a shot at a ~100 watt system to run some 12V fans on my insert and a bluetooth temperature sensor/transmitter. electricity nw But the latest hurdle is that I thought a buck/boost converter might help smooth the wide power swings coming out of the TEGs as they warm/cool. But it turns out if the converter input power goes slightly over/under the output demand, it goes into shutdown and needs a ‘hard reset’. So while it can take a 6-30V input and make a 1-35V output, it needs to be a ‘constant’ input/output. Otherwise, you have to unplug it, bring the loads back in range and restart.

I had also toyed with the idea of making a ‘smoke bell’ for my Aladdin lamps with a TEG. These fit on top of the glass chimney and are exposed to the heat of the kerosene mantle. With 4-5W of output power, it would likely drive LEDs to put out more light than the actual lamp does. An interesting demonstration of how far technology has come!

Les Otten the lead owner is a fairly controversial person in the area. gasbuddy He is a "developer" that is very good at leveraging other peoples money. He was a minority player in the Red Sox’s sale several years ago yet his involvement seems to increase every time he talks about it. He is also a ski resort developer and a lot of folks lost a lot of money when the company he founded went belly up https://www.newenglandskihistory.com/skiareamanagement/americanskiingcompany.php. He has been developing a defunct ski resort in Northern NH for several years with promises that ground would be broken "very soon" and has done so for four years. It turns out that a major source of the early stage funding was a utility that paid him under the table for him to support a nearby power project. o goshi I would not bet on his firm coming out with a successful commercial product anytime soon. For a couple of years the city next to me had a combination of incentives which cut the out of pocket cost of a pellet boiler installation down to less than 5K including bulk storage. In addition to the homeowner incentives on the boilers, they also got a 50% match up to $4000 in subsidies for energy improvements. Along with the incentives there was money to hire people to beat the bushes to get folks sign up. bp gas prices akron ohio MES ended up supplying the majority of the equipment and also happens to be the only bulk delivery supplier of pellets in the area. They dont talk a lot about their early product they imported that turned out to be rather maintenance intensive to the point where many were pulled out by early adopters.

They have been occasionally talking on about the potential for co-generation off their boilers. If you search for the supplier of the Sterling engines its pretty obvious that its an early stage company. It has a lot of similarities of the Sunpower design from 20 years ago. https://sunpowerinc.com/1kw-stirling-engine/ Sunpower even sold a few research prototypes at one point but their focus has been to sell the IP to some other firm and then get paid to do the research to make it commercial. Dean Kamen of Segway fame also has been claiming to have a Sterling Cycle design ready for production for years and claims that his home is supplied power from one of his units. He also wants to license his IP to some other firm to produce the actual engines. He even toured the media circuit and I think he plugged it on 60 Minutes as the next best thing. It occasionally still pops up but to date I havent seen any firm plans for production. There was also a firm based in New Zealand that had a similar free piston design that got a trial in England for home heating. which I believe ended up with the units withdrawn from the market I think Honda even dabbled in them. STM back in 2001 had a so called commercial design that they were selling https://www.power-eng.com/articles/print/volume-105/issue-10/features/stirling-engine-stirling-technology-engines-shooting-for-dg-market-penetration.html. The company I worked for installed several STMs in a biodiesel facility, and our techs spent a lot of time replacing the piston seals which usually is the downfall for Sterlings. The company was always promising they had the seal issue licked (as have many others) and did so until the day they went bankrupt. There was lot of hype on PBS several years ago on tracking solar dish generators that had been developed by Sandia National labs, they licensed the technology to a company called Razor who got a lot of federal and state money to build large solar fields. gas density of air The problem they had is the Sterling cycle generators that was the heart of the equipment never proved to be reliable. Back in college I remember Chicago Bridge and Iron touring with their free piston Sterling cryocooler The point of this is Sterling cycle units have been too good to be true for many years and always just down the road waiting for funding and subsidies.