Waste Heat Recovery Systems with Isobaric Expansion Technology Using Pure and Mixed Working Fluids

Sander Roosjen, Maxim Glushenkov, Alexander Kronberg and Sascha Kersten
Additional contact information
Sander Roosjen: Sustainable Process Technology, Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
Maxim Glushenkov: Encontech B.V. TNW/SPT, P.O. Box 217, 7500 AE Enschede, The Netherlands
Alexander Kronberg: Encontech B.V. TNW/SPT, P.O. Box 217, 7500 AE Enschede, The Netherlands
Sascha Kersten: Sustainable Process Technology, Faculty of Science and Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands

Energies, 2022, vol. 15, issue 14, 1-14

Abstract: Economic expedience of waste heat recovery systems (WHRS), especially for low temperature difference applications, is often questionable due to high capital investments and long pay-back periods. With a simple design, isobaric expansion (IE) machines could provide a viable pathway to utilizing otherwise unprofitable waste heat streams for power generation and particularly for pumping liquids and compression of gases. Different engine configurations are presented and discussed. A new method of modeling and calculation of the IE process and efficiency is used on IE cycles with various pure and mixed working fluids. Some interesting cases are presented. It is shown in this paper that the simplest non-regenerative IE engines are efficient at low temperature differences between a heat source and heat sink. The efficiency of the non-regenerative IE process with pure working fluid can be very high, approaching Carnot efficiency at low pressure and heat source/heat sink temperature differences. Regeneration can increase efficiency of the IE cycle to some extent. Application of mixed working fluids in combination with regeneration can significantly increase the range of high efficiencies to much larger temperature and pressure differences.

Keywords: isobaric expansion engines; heat driven pump; compressors; low-grade heat; mixed working fluids (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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