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Experimental testing and modeling of 5 kW oil-free open drive scroll expander using R245fa.

Number: pap.1480

Author(s) : ACCORSI F. A., JAMES N. A., GROLL E. A., et al.

Summary

Organic Rankine Cycles (ORC) are thermodynamic power cycles designed to generate work from low temperature heat sources. The low temperature heat input is, typically, between 80°C to 270°C. The efficiency of an ORC is highly dependent on the expander characteristics. This article experimentally evaluates the performance of a scroll expander with nominal capacity of 5 kW, built-in volume ratio of 3.5. Tests were conducted in an ORC test-rig using R245fa as the working fluid. The expander was tested over a full performance map consisting of two temperature sources 85°C and 110°C and five expander speeds, from 800 RPM to 3000 RPM.
The scroll expander achieved a maximum isentropic efficiency of 0.58, for a volume ratio of 6.12, at the expander speed of 1600 RPM and temperature source of 110°C. The same temperature source also registered the maximum expander power output, 3.75 kW, at volume ratio of 6.55 and an expander speed of 2500 RPM. A semi-empirical model was developed to predict the expander output power and isentropic efficiency. The model was in close agreement with the experimental results with a mean deviation of 4.93%, for the expander isentropic efficiency, and 4.23%, for the power output. The semi-empirical model suggests friction and leakage influence efficiency more than any other source.

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Pages: 12 p.

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Details

  • Original title: Experimental testing and modeling of 5 kW oil-free open drive scroll expander using R245fa.
  • Record ID : 30019468
  • Languages: English
  • Source: 2016 Purdue Conferences. 23rd International Compressor Engineering Conference at Purdue.
  • Publication date: 2016/07/11

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