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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748


Irakli G. Shekriladze
Georgian Technical University, Tbilisi, Georgia

Evtikhi S. Machavariani
Georgian Technical University 77 Kostava Street, Tbilisi 0175, Georgia

Giorgi I. Gigineishvili
Georgian Technical University 77 Kostava Street, Tbilisi 0175, Georgia

David I. Shekriladze
Georgian Technical University 77 Kostava Street, Tbilisi 0175, Georgia

DOI: 10.1615/TFEC2017.mst.018815
pages 2769-2781


The paper describes the current state and prospects for further development of steam engine-pump (SEP)powered by low potential heat. The SEP differs from classical membrane pump by upper part that represents the simplest heat engine with opposing pair, evaporator (heated from above cover with downward-facing capillary surface) and upward-facing condenser (a membrane cooled from below by pumped water), and certain charge of low-boiling working agent. When integrated in standalone hot water supply with solar flat-plate collector(FPC) the SEP can pump water from water well through the FPC to hot water tank located at high mark, without electric power consumption and virtually no heat loss. The SEP can also circulate water in cooling system of stationary diesel power unit, using the exhaust heat instead spending for it the part of the engine power. In the early years three prototypes of the SEP have been developed. At the present stage new (forth) prototype is developed with so-called "two-speed condensation mode" ensuring improved performance. Feasibility of the pumping process and encouraging level of efficiency are demonstrated. The problem of self-startup is also solved. The thermodynamic cycle of the SEP is considered. The peculiar stage of the cycle is identified when the pair membrane-condensed working agent hits the dried and overheated evaporator. Sandwiched between the evaporator and membrane condensate undergoes peculiar process of boiling that we call percussive boiling. The results of modeling and experimental study of the percussive boiling are also presented.

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