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A Study on Generating efficiency of the Double Acting Stirling Engine/Generator

양방향 스털링엔진/발전기의 효율 특성 연구

PARK, SEONGJE;KO, JUNSEOK;HONG, YONGJU;KIM, HYOBONG;YEOM, HANKIL;IN, SEHWAN
박성제;고준석;홍용주;김효봉;염한길;인세환

  • Received : 2015.11.09
  • Accepted : 2016.02.28
  • Published : 2016.02.29

Abstract

This paper describes generating efficiency characteristics of the double acting Stirling engine/generator for domestic small-scale CHP (Combined Heat and Power) system. In small distributed generation applications, Stirling engine has competition from fuel cell, microturbine and etc. In order to be economical in the applications, a long life with minimum maintenance is generally required. Free piston Stirling engine (FPSE) has no crank and rotating parts to generate lateral forces and require lubrication. Double acting Stirling engine/generator has one displacer and two power piston which are supported by flexure springs. Two power pistons oscillate with symmetric displacement and are connected with moving magnet type linear generators for power generation from PV work. In experiments, 1 kW class double acting free piston Stirling engine/generator is fabricated and tested. Heat is supplied to hot end of engine by the combustion of natural gas and converted to electric power by linear generators which are assembled with power pistons. The electric parameters such as voltage, current and phase are measured with for variable flow rate of fuel gas. Especially, generating efficiency of FPSE is measured with three different measurement methods. Generating efficiency of the double acting Stirling engine/alternator is about 24%.

Keywords

Double acting free piston Stirling engine/alternator;Generating efficiency;Piston;Displacer;Regenerator

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Acknowledgement

Supported by : 산업통상자원부, 한국기계연구원