This is an omnibus version of solar thermal energy generation and covers videos 1941, 1940,1939, 1938,1937 and 1936 on the main channel
The Tinkercad files mentioned in the video can be found here
https://www.tinkercad.com/things/3QcshKaoqw8
and here
https://www.tinkercad.com/things/5nWjM2bpGqK