Abstract:
Stirling engines are a type of reciprocating external combustion engines that use one or
more pistons to achieve useful work through some input of heat from an external source. The
liquid piston heat engine, also known as the Fluidyne design, utilizes liquid water as pistons
that are enclosed in a cylinder which entraps a working gas. Stirling engines are low efficiency
engines that can utilize waste and low-grade thermal energy to pump water at a small scale.
Exploiting these low-grade waste and renewable energies provides significant opportunities for
addressing the energy related problems, such as energy safety and shortage, greenhouse gas
emission, water dissipation, etc. Due to the great capability of recovering low-grade heat with
potentially high efficiencies, Stirling cycle engines have attracted increasing attention in recent
decades. Due to their low power density and efficiency use of fluidyne pumps at a small scale
may be very useful. Liquid pistons avoid the sliding mechanical seal and accurately
dimensioned cylinders, which provide great flexibility mechanical design with much simpler
constructions. With the implementation of fluidyne pumps both the requirements efficient
utilization of energy sources and a shift to renewable resources are fulfilled. This research will
raise awareness for the neglected way of using renewable source to pump water especially the
use of biomass. The research will also cover that what effects are observed when in a fluidyne
engine the water levels are changed and the effect of using a mixture of different working
liquids of low heats of vaporization
