Comparison of the externally heated air valve engine and the helium Stirling engine

Heat exchanger operation in the externally heated air valve engine with separated settling chambers

“…Our earlier results [1,2] suggest that the collectors of heat exchangers may play a role of settling chambers which take the highly unsteady gas stream incoming from the engine at one side and change it into an almost stationary stream at the other side (in fact, this can be an unsteady flow of rather insignificant changes). The change depends on the design and the volume of settling chambers, however, the algorithm applied in the model described in Ref.…”

“…In the calculation algorithm, the initial phase has been performed similarly to the procedure described in Ref. [2] until the stable state is reached (typically 250 cycles) and, later, a new procedure replaces the action of the heat exchangers while the main part of the engine is simulated normally, like in Section 4. The new procedure includes additional losses caused by the settling chambers and the results can be seen in Figs.…”

“…[1] and its comparisons to the helium Stirling engine are to be found in Ref. [2]. Air powered engines like the one discussed here, which works in the modified Joule cycle are still developed e theoretically, in a smaller scale, see Lontsi et al [3] or in a similar scale, also practically, by Xu et al [4] and their heat exchange process is under investigation, e.g.…”