THERMAL SCIENCE

International Scientific Journal

Yalcinkaya Deniz Yildirim

,

Arif Hepbasli

,

Huseyin Gunerhan

ENERGY AND EXERGY ASSESSMENTS OF A SINGLE FLASH GEOTHERMAL AND ORC SYSTEM WITH PACKED BED STORAGE USING OLIVE POMACE

ABSTRACT
This study presents a detailed analysis of a packed bed thermal energy storage system, supported by a critical review of similar configurations in the literature. The research emphasizes the impact of working fluids on overall system performance. Key parameters including thermal storage capacity, heat transfer mechanisms, pressure drop, air-flow velocity, biomass feed rate, and heat transfer fluid temperature are assessed for their roles in determining system behavior. The main objective is to develop an innovative system that integrates an ORC with a single flash geothermal unit. Thermodynamic assessments, covering both energy and exergy analyses, were performed using MATLin conjunction with the CoolProp library to ensure precise thermophysical property data. Departing from conventional geothermal set-ups, this study introduces a novel ORC-SFGEO integration. While R245fa remains a benchmark working fluid, the study also evaluates low global warming potential alternatives including R1233zd(E), R1234ze(Z), R1234ze(E), and R1234yf commonly used in heat pumps to enhance thermodynamic and environmental performance. Results show that the integrated system yields a 40% performance increase compared to similar systems in the literature. The energy and exergy efficiencies of the base system, without a heat pump, are 24.26% and 7.51%, respectively. When the HPS is integrated, exergy efficiency improves by 55.5%, addressing fluctuations in solar input.
KEYWORDS
packed bed thermal energy storage, ORC, waste heat recovery, single flash geothermal energy cycle, exergy analysis
PAPER SUBMITTED: 2025-03-27
PAPER REVISED: 2025-06-25
PAPER ACCEPTED: 2025-07-29
PUBLISHED ONLINE: 2025-09-26
DOI REFERENCE: https://doi.org/10.2298/TSCI2504229Y
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 4, PAGES [3229 - 3238]
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Energy and exergy assessments of a single flash geothermal and ORC system with packed bed storage using olive pomace

2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence