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Energies 2014, 7(8), 4957-4971; doi:10.3390/en7084957

Study on the Characteristics of Expander Power Output Used for Offsetting Pumping Work Consumption in Organic Rankine Cycles

Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education and Key Laboratory of Heat Transfer and Energy Conversion, Beijing Municipality, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
An earlier version of this paper was presented at the International Heat Transfer Symposium 2014 (IHTS2014), which was sponsored by North China Electric Power University and held in Beijing, China on 6–9 May 2014.
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Received: 24 June 2014 / Revised: 25 July 2014 / Accepted: 28 July 2014 / Published: 31 July 2014
(This article belongs to the Special Issue Waste Heat Recovery—Strategy and Practice)
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Abstract

The circulation pump in an organic Rankine cycle (ORC) increases the pressure of the liquid working fluid from low condensing pressure to high evaporating pressure, and the expander utilizes the pressure difference to generate work. A portion of the expander output power is used to offset the consumed pumping work, and the rest of the expander power is exactly the net work produced by the ORC system. Because of the relatively great theoretical pumping work and very low efficiency of the circulation pump reported in previous papers, the characteristics of the expander power used for offsetting the pumping work need serious consideration. In particular, the present work examines those characteristics. It is found that the characteristics of the expander power used for offsetting the pumping work are satisfactory only under the condition that the working fluid absorbs sufficient heat in the evaporator and its specific volume at the evaporator outlet is larger than or equal to a threshold value. View Full-Text
Keywords: organic Rankine cycle (ORC); pumping work; expander power organic Rankine cycle (ORC); pumping work; expander power
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Wu, Y.-T.; Lei, B.; Ma, C.-F.; Zhao, L.; Wang, J.-F.; Guo, H.; Lu, Y.-W. Study on the Characteristics of Expander Power Output Used for Offsetting Pumping Work Consumption in Organic Rankine Cycles. Energies 2014, 7, 4957-4971.

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