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http://dx.doi.org/10.7316/KHNES.2014.25.6.648

A Study on the Design of the Free-Piston Stirling Engine/Alternator  

Park, Seongje (Grad. Department of Energy System, Korea Institute of Machinery & Materials)
Hong, Yongju (Grad. Department of Energy System, Korea Institute of Machinery & Materials)
Ko, Junseok (Grad. Department of Energy System, Korea Institute of Machinery & Materials)
Kim, Hyobong (Grad. Department of Energy System, Korea Institute of Machinery & Materials)
Yeom, Hankil (Grad. Department of Energy System, Korea Institute of Machinery & Materials)
In, Sehwan (Grad. Department of Energy System, Korea Institute of Machinery & Materials)
Kang, Insu (Grad. Department of Energy System, Korea Institute of Machinery & Materials)
Lee, Cheongsu (Grad. Department of Energy System, Korea Institute of Machinery & Materials)
Publication Information
Transactions of the Korean hydrogen and new energy society / v.25, no.6, 2014 , pp. 648-655 More about this Journal
Abstract
This paper describes the continuing effort to develope a single acting free-piston Stirling engine/alternator combination for use of the household cogeneration. Free piston Stirling engines(FPSE) use variations of working gas pressure to drive mechanically unconstrained reciprocating elements. Stirling cycle free-piston engines are driven by the Stirling thermodynamic cycle which is characterized by an externally heated device containing working gas that is continuously re-used in a regenerative, reversible cycle. The ideal cycle is described by two isothermal process connected by two constant volume processes. Heat removed during the constant volume cooling process is internally transferred to the constant volume heating process by mutual use of a thermal storage medium called the regenerator. Since the ideal cycle is reversible, the ideal efficiency is that of Carnot. Free-piston Stirling engine is have no crank and rotating parts to generate lateral forces and require lubrication. The FPSE is typically comprised of two oscillating pistons contained in a common cylinder. The temperature difference across the displacer maintains the oscillations, and the FPSE operate at natural frequency of the mass-spring system. The power is generated from a linear alternator. The purpose of this paper is to describe the design process of the single acting free-piston Stirling engine/alternator. Electrical output of the single acting free-piston Stirling engine/alternator is about 0.95 kW.
Keywords
Free-piston Stirling engine/alternator; Piston; Displacer; Operating frequency; Heat exchanger;
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