Field-test of a solar low delta-T Stirling engine

The ultimate aim of a Moroccan–German study is to develop a simple solar pumping system, using the concept of low delta-T Stirling engines. This paper describes the main parts of the engine and presents several experimental measurements made under laboratory and field-test conditions in Morocco. Measurements with flat plate cooler and discontinuous motion of the displacer were conducted to verify two essential recommendations of Kolin in expectation of power-output improvements of the gamma-type engine.

► We present two versions of solar LTD Stirling engine. ► The prototypes were tested in Laboratory and under real conditions. ► Power increases with the use of flat plat cooler. ► Discontinuous motion affect the stability of the engine negatively.