bernardd wrote:I imagine a vapor temperature of around 500/600 ° C which should give a pressure between 80 and 90bars, but I have no precise information above, the vapor is new to me :-)
With 1m2 solar concentrators, we exceed 600 ° C, so no problem on this side ...
What do you think ?
attention 600 ° is beyond the critical water temperature
so anyway in a steam engine the vaporization is done in a boiler less hot than that, then there are the superheaters which can be at 600 ° but only part of the heat is exploited with the efficiency determined by 600 °
in addition it makes the pressure too strong to be practical with reasonable means
on a small scale I find the steam good for 200 or 250 ° C: the higher temperatures are precisely the damage of stirling: we can go up to high temperature and choose the pressure we want: close to atmospheric pressure if the we don't want to take a risk or a little stronger if we want to be more concentrated
as the stirling gives a yield always far enough from the theory I prefer to split the cycle in 2: stirling at 800 ° C with cold part at 200 ° C serving as a boiler for a steam engine
the steam engine has among other the advantage of being able to instantly control the power to regulate the speed of the alternator according to the demand for electricity: what stirling cannot do
having at least part of the steam cycle avoids a variable speed alternator and an inverter to make good 50hz