RE: Micro CHP Systems: Cost per kWe8 Sep 2020 15:47
Oldblue: you are starting to sound like me! As Professor Darabkhani stated, the disadvantage of Stirling mCHP is they produce no electricity when not producing heat. If you can't use the electricity then you've bought an expensive inefficient boiler. Observer and I have agreed there are niche applications for a device like the Charger, if it performs as claimed, where heat is continually needed - ideally 24/7. The Charger is claimed to produce 6.4 kWe but this also means it will only be outputting about 11.6 kWt, pretty pathetic even for a domestic boiler. The principle of a secondary boiler is to boost thermal output during excessive demand only. The economics of the Charger, with the specs as per their website, will be difficult to assess in a domestic setting. I still have doubts that they have achieved a Sterling engine efficiency of 36%, I would have thought NASA would be banging on their door to take a peek but perhaps like the rest of us, they don't know where their door is! If they really have achieved 36% then the figures given can be explained by using 3.2kwe to produce an additional 3.2 kWt at peak times, to give a max thermal of 15 kW and max electric of 6.4 kW - BUT NOT NOT NOT simultaneously as they have previously claimed.
For a company that was going to launch their product this year, they are making zero progress. After a decade, no one knows what the device actually produces, apart from utter bewilderment.
I think JG was sold a pup, he thought a few grand, a lick of paint and bingo, a world leading boiler product rolling off the shelves. But, he did not appreciate the engineering involved or the difficulties in getting a complex product to market.
I look forward to CH uncovering the truth behind the magic boiler!