Wolfgang Scheffler did Solar kitchens that use a large parabolic dish section on equatorial mount to cook food and sometimes accumulate heat for later.  The dish section is distorted as the seasons change to keep its parabolic nature and keep focused.  The solar accumulator tries to achieve the same thing without distorting the dish.   Instead of distorting the shape, the dish rotates around the focal point to do the seasonal change. Equatorial mount means one daily seasonal adjustment and then a timed rotation will keep the thing pointed at the sun all day.  I made the first attempt a few years back and learned from it.
Videos of my progress are on youtube under my name "gaiatechnician". For the project, I "invented" dripper trackers. (3 versions depending on your technology level).  Also I made the "mechanical Mathematician" which uses simple tools to make a parabolic dish or partial parabolic dish directly. It is very useful because it also gives you your focal point. (Really important if you are making a partial dish).  The dual dish tracking solar accumulator has not been made yet, and neither has the "liquid piston tracker"
Anyway, it is a large project and I do not have the time to develop it much further. Anyone want to join in?
Edited to add,  and and and and are parts of the tracking solar accumulator project.
Brian White, Victoria  BC Canada