it's make or break for cfu!, page-9

Just some clarification on Stirling engines. They use heat, they are not heat generators. You must have a heat source (and a lower temperature heat sink) in the first place. The targeted market is for industry that has excessive waste heat and the SE recovers some of that heat as electrical energy. To compare them the Bluegens you would have to burn gas, create heat and turn that heat into electrical energy at 10% efficiency, compared to bluegens 60% without heat recovery. The SE is in no way competitive for household use when compared to Bluegen.

Without going into the thermodynamics of the SE, the ratio of the heat source and heat sink temperature have a lot to do with efficiency of any heat engine. To get an SE to be anywhere close to the Bluegen the temperature difference (source to sink) would need to be several hundreds of degrees.

Just to finish of the heat from the Bluegen could actually be used to run a SE if heating was not required for other purposes, not very efficient use of the "waste" heat compared to utilising it for direct heating but would increase the electrical output. Perhaps this is another avenue to pursue for CFU.