This article deals with the issue of increasing an efficiency of the vacuum cooling systems during biodieselproduction by using a new type of vacuum units, such as liquid-vapor ejector, which working process is based onthe principle of jet thermal compression. The geometry of the flowing part has a significant impact on theefficiency of the mixing process in primary and secondary flows and the unit as a whole. The authors considerstructural variations of liquid-vapor ejectors – with cylindrical and conical mixing chambers, followed by acylindrical section, with a diffuser and without it. Numerical and experimental studies of liquid-vapor ejectorwith a various geometry of the flow part were put into practice and made it possible to obtain the dependence ofthe performance of the liquid-vapor ejector and the units on its basis, that allows to determine the optimaloperating conditions of the system on the basis of this ejector. Analysis of the LVE exergetic efficiency and theunit as a whole made it possible to conclude that it is appropriate to use this type of ejector in the vacuumcooling systems of biodiesel production.
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