Title: Energy and exergy analyses of a hydrogen added wet-ethanol fuelled HCCI engine-based cogeneration of power and refrigeration

Authors: Tawfiq Abdul-Aziz Al-Mughanam; Abdul Khaliq

Addresses: Department of Mechanical Engineering, College of Engineering, King Faisal University, P.O. Box 380, Al Ahsa 31982, Saudi Arabia ' Mechanical Engineering Department, College of Engineering at Yanbu, Taibah University, Yanbu Al-Bahr 41911, Saudi Arabia

Abstract: This study aimed to propose and investigate a novel system that combines organic Rankine cycle and ejector refrigeration cycle with hydrogen production and on-site utilisation in HCCI engine. Energy and exergy analyses shown that using R134a as working fluid and elevation of pressure ratio by 40% results in enhancement of cogeneration efficiency by 4.63%. Promoting vapour generator pressure (P_VG) decreases the cooling capacity by more than 2% for R134a systems, while this decrease becomes 1.9% for R600a. Increasing evaporator pressure (P_evap) greatly improves performance and cooling capacity. Exergy destruction in HCCI engine dropped from 90.09% to 89% with 20% hydrogen.

Keywords: HCCI engine; organic Rankine cycle; ORC; ejector refrigeration cycle; ERC; electrolyser; exergy; hydrogen; wet-ethanol.

DOI: 10.1504/IJEX.2024.138739

International Journal of Exergy, 2024 Vol.44 No.1, pp.1 - 15

Received: 08 Dec 2023
Accepted: 27 Feb 2024
Published online: 29 May 2024 *

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