Organic fluids in a supercritical rankine cycle for low temperature power generation

Rachana Vidhi; Sarada Kuravi; D. Yogi Goswami; Elias Stefanakos; Adrian S. Sabau

doi:10.1115/1.4023513

Organic fluids in a supercritical rankine cycle for low temperature power generation

Rachana Vidhi, Sarada Kuravi, D. Yogi Goswami, Elias Stefanakos, Adrian S. Sabau

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Abstract

This paper presents a performance analysis of a supercritical organic Rankine cycle (SORC) with various working fluids with thermal energy provided from a geothermal energy source. In the present study, a number of pure fluids (R23, R32, R125, R143a, R134a, R218, and R170) are analyzed to identify the most suitable fluids for different operating conditions. The source temperature is varied between 125 °C and 200 °C, to study its effect on the efficiency of the cycle for fixed and variable pressure ratios. The energy and exergy efficiencies for each working fluid are obtained and the optimum fluid is selected. It is found that thermal efficiencies as high as 21% can be obtained with 200 °C source temperature and 10 °C cooling water temperature considered in this study. For medium source temperatures (125-150 °C), thermal efficiencies higher than 12% are obtained.

Original language	English
Article number	042002
Journal	Journal of Energy Resources Technology, Transactions of the ASME
Volume	135
Issue number	4
DOIs	https://doi.org/10.1115/1.4023513
State	Published - Dec 2013

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title = "Organic fluids in a supercritical rankine cycle for low temperature power generation",

abstract = "This paper presents a performance analysis of a supercritical organic Rankine cycle (SORC) with various working fluids with thermal energy provided from a geothermal energy source. In the present study, a number of pure fluids (R23, R32, R125, R143a, R134a, R218, and R170) are analyzed to identify the most suitable fluids for different operating conditions. The source temperature is varied between 125 °C and 200 °C, to study its effect on the efficiency of the cycle for fixed and variable pressure ratios. The energy and exergy efficiencies for each working fluid are obtained and the optimum fluid is selected. It is found that thermal efficiencies as high as 21% can be obtained with 200 °C source temperature and 10 °C cooling water temperature considered in this study. For medium source temperatures (125-150 °C), thermal efficiencies higher than 12% are obtained.",

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T1 - Organic fluids in a supercritical rankine cycle for low temperature power generation

AU - Vidhi, Rachana

AU - Kuravi, Sarada

AU - Yogi Goswami, D.

AU - Stefanakos, Elias

AU - Sabau, Adrian S.

PY - 2013/12

Y1 - 2013/12

N2 - This paper presents a performance analysis of a supercritical organic Rankine cycle (SORC) with various working fluids with thermal energy provided from a geothermal energy source. In the present study, a number of pure fluids (R23, R32, R125, R143a, R134a, R218, and R170) are analyzed to identify the most suitable fluids for different operating conditions. The source temperature is varied between 125 °C and 200 °C, to study its effect on the efficiency of the cycle for fixed and variable pressure ratios. The energy and exergy efficiencies for each working fluid are obtained and the optimum fluid is selected. It is found that thermal efficiencies as high as 21% can be obtained with 200 °C source temperature and 10 °C cooling water temperature considered in this study. For medium source temperatures (125-150 °C), thermal efficiencies higher than 12% are obtained.

AB - This paper presents a performance analysis of a supercritical organic Rankine cycle (SORC) with various working fluids with thermal energy provided from a geothermal energy source. In the present study, a number of pure fluids (R23, R32, R125, R143a, R134a, R218, and R170) are analyzed to identify the most suitable fluids for different operating conditions. The source temperature is varied between 125 °C and 200 °C, to study its effect on the efficiency of the cycle for fixed and variable pressure ratios. The energy and exergy efficiencies for each working fluid are obtained and the optimum fluid is selected. It is found that thermal efficiencies as high as 21% can be obtained with 200 °C source temperature and 10 °C cooling water temperature considered in this study. For medium source temperatures (125-150 °C), thermal efficiencies higher than 12% are obtained.

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Organic fluids in a supercritical rankine cycle for low temperature power generation

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