Abstract
Volumetric expanders are suitable for more and more applications in the field of micro- and small-scale power system as waster heat recovery or solar energy. This paper present an experimental study carried out on a swatch-plate piston expander. The expander was integrated into an ORC test-bench using R245fa. The performances are evaluated in term of isentropic efficiency and filling factor. The maximum efficiency and power reached are respectively 53% and 2 kW. Inside cylinder pressure measurements allow to compute mechanical efficiency and drown P-V diagram. A semi-empirical simulation model is then proposed, calibrated and used to analyse the different sources of losses.
Highlights
The piston expander is among the oldest displacement machines
Piston expanders show some advantages over other expansion machines, such as larger built-in volume ratio, high achievable operating pressures and temperatures, their ability to ingest liquid and low rotational speeds
The present paper describes an experimental investigation conducted on a swash-plate piston expander, characterized by a total cylinder volume of 195 cm3
Summary
The piston expander is among the oldest displacement machines. It has been largely used during the Industrial Revolution and up to the beginning of the 20th century. Piston expanders show some advantages over other expansion machines, such as larger built-in volume ratio, high achievable operating pressures and temperatures, their ability to ingest liquid and low rotational speeds. For a given rotational speed, the supply pressure is controlled by modifying the mass flow rate, which is imposed by the pump.
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