N negativentropy Registered Registered Joined Feb 20, 2013 Messages 32 Feb 5, 2015 #11 Your second guess is right - its the regenerator of a Stirling engine.
N negativentropy Registered Registered Joined Feb 20, 2013 Messages 32 Feb 5, 2015 #12 ... And this is the cold exchanger: http://www.hobby-machinist.com/showthread.php/31835-brazing-heat-exchanger
... And this is the cold exchanger: http://www.hobby-machinist.com/showthread.php/31835-brazing-heat-exchanger