THERMAL SCIENCE

International Scientific Journal

Ahmet Elbir

,

Feyza Akarslan Kodaloglu

,

Ibrahim Ucgul

,

Mehmet Erhan Sahin

THERMODYNAMIC ANALYSIS OF REFRIGERANTS USED IN ORC-VCC COMBINED POWER SYSTEMS FOR LOW TEMPERATURE HEAT SOURCES

ABSTRACT
Fossil resources are largely used for energy supply. This situation causes environ­mental pollution. In recent years, studies in the field of more environmentally friend­ly and sustainable energy conversion technologies have increased. In this context, organic Rankine cycle (ORC) technology is combined with RES. In this study, combined ORC and vapor compression cycle (VCC) were investigated. The electricity produced in the combined ORC-VCC system was used both in the compressor of the VCC system and in the plant. The main factor affecting the efficiency of the combined ORC-VCC system is the refrigerant. Therefore, it is necessary to examine the selection of the most suitable refrigerant for an ORC-VCC based system. Fifteen different refrigerants were optimized with the enginering equation solver program, and energy and exergy analyzes of the systems were made separately. According to the results, the best energy efficiency and COP values among the refrigerants was found to be R40 (ηORC = 0.1206) for the ORC system and R113 (COP = 4.405) for the VCC system. For all system components in the VCC, the most exergy destruction occurs in the evaporator, followed by the compressor, condenser, and throttle, respectively. In ORC, the most exergy destruction is in the evaporator, followed by the condenser, tube and pump, respectively. The total efficiency was found to be (β = 0.53) for the combined ORC-VCC system. The total exergetic efficiency was found to be (ψglob = 0.26) for the combined ORC-VCC system.
KEYWORDS
ORC, VCC, refrigerants, exergy, energy
PAPER SUBMITTED: 2021-06-12
PAPER REVISED: 2021-11-11
PAPER ACCEPTED: 2022-04-15
PUBLISHED ONLINE: 2022-07-23
DOI REFERENCE: https://doi.org/10.2298/TSCI2204855E
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 4, PAGES [2855 - 2863]
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Thermodynamic analysis of refrigerants used in ORC-VCC combined power systems for low temperature heat sources

© 2024 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