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Application oriented design and theoretical investigation of a screw type steam expander.

Number: pap. 1449

Author(s) : GRIEB M., BRÜMMER A.

Summary

This paper contains results of an exemplary design and dimensioning process of a screw expander for an organic Rankine cycle for the exhaust heat recovery of internal combustion engines. Both geometric parameters and system parameters are varied in a wide range to maximize overall power output. It is shown that, for small scale applications in particular, a combination of an uncommonly large inner volume ratio with high inlet pressures can be advantageous, despite the fact that only relatively small isentropic expander efficiency is achieved. The remainder of the study includes a consideration of several part load Rankine cycle operation points and presents a method for averaging the final expander size. During the dimensioning process, multi chamber model simulation is used to predict the operation behavior of the screw expander. The multi chamber model of the machine is scaled taking geometrical similarity into consideration (excluding clearance heights) during the simulation process at constant circumferential speed. In this way it is ensured that the actual expander mass flow always matches the calculated ORC mass flow. Moreover, to estimate the overall performance of the heat recovery system and to find common pressure- and speed-dependent operating points for part and full load, a characteristic map of the selected screw expander is calculated.

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Pages: 10 p.

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Details

  • Original title: Application oriented design and theoretical investigation of a screw type steam expander.
  • Record ID : 30014096
  • Languages: English
  • Source: 2014 Purdue Conferences. 22nd International Compressor Engineering Conference at Purdue.
  • Publication date: 2014/07/14

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