From organic rankine cycles to high-temperature heat pumps : A thermo-economic investigation of potential working fluids

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00009097
URN to cite this document: urn:nbn:de:bvb:703-epub-9097-8

Title data

Obika, Echezona ; Heberle, Florian ; Brüggemann, Dieter:
From organic rankine cycles to high-temperature heat pumps : A thermo-economic investigation of potential working fluids.
In: Energy Conversion and Management: X. Vol. 27 (2025) . - 101156.
ISSN 2590-1745
DOI der Verlagsversion: https://doi.org/10.1016/j.ecmx.2025.101156

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Abstract

The thermo-economic performance of high-temperature heat pump utilizing working fluids applied to ORC systems with high critical temperatures like cyclohexane, hexane and cyclopentane were compared to intensively examined working fluids, in this study. The aim is to determine their economic feasibility for high temperature supply up to 150 °C. The vapor compression cycle with internal heat exchanger was adopted for this evaluation, for a heat source of 50 °C, supply temperatures in the range of 100 to 150oC and heat exchanger pinch point temperature difference of 5 K. The coefficient of performance (COP) of the cycle was optimized at the considered boundary condition by attaining maximum subcooling at the condenser. A 7.9 higher COP was obtained with cyclopentane compared to the state-of-the-art working fluid R1336mzz(Z). From the economic point of view these cyclic hydrocarbons, especially cyclopentane, are associated with 1.5 higher specific investment cost. However, these working fluids lead to 5 discounted payback period due to increased performance, compared to R1336mzz(Z). These positive results affirm the prospect of cyclopentane as a suitable working fluid for heat pump applications both from the thermodynamic and economic point of view.

Further data

Item Type:	Article in a journal
Keywords:	Cyclohexane; COP; Vapor compression; Waste heat; Supply temperature; Levelized cost of heat
DDC Subjects:	600 Technology, medicine, applied sciences > 620 Engineering
Institutions of the University:	Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes > Chair Engineering Thermodynamics and Transport Processes - Univ.-Prof. Dr.-Ing. Dieter Brüggemann Research Institutions > Research Units > Zentrum für Energietechnik - ZET Faculties Faculties > Faculty of Engineering Science Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes Research Institutions Research Institutions > Research Units
Language:	English
Originates at UBT:	Yes
URN:	urn:nbn:de:bvb:703-epub-9097-8
Date Deposited:	10 Apr 2026 11:01
Last Modified:	10 Apr 2026 11:01
URI:	https://epub.uni-bayreuth.de/id/eprint/9097

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