Thermodynamic analysis and assessment of a novel integrated geothermal energy-based system for hydrogen production and storage Yunus Emre Yuksel a , Murat Ozturk b,* , Ibrahim Dincer c,d a Department of Science, Education Faculty, Afyon Kocatepe University, 03200 Afyon, Turkey b Department of Mechatronics Engineering, Faculty of Technology, Suleyman Demirel University, Cunur, West Campus, Isparta, Turkey c Faculty of Engineering and Applied Science, University of Ontario Institute of Technology (UOIT), 2000 Simcoe Street North, Oshawa, Ont. L1H 7K4, Canada d Faculty of Mechanical Engineering, Yildiz Technical University, Istanbul, Turkey article info Article history: Received 18 July 2017 Received in revised form 19 August 2017 Accepted 21 August 2017 Available online xxx Keywords: Geothermal power Energy Thermodynamic assessment Hydrogen production Exergy abstract In this paper, thermodynamic analysis and assessment of a novel geothermal energy based integrated system for power, hydrogen, oxygen, cooling, heat and hot water production are performed. This integrated process consists of (a) geothermal subsystem, (b) Kalina cycle, (c) single effect absorption cooling subsystem and (d) hydrogen generation and storage subsystems. The impacts of some design parameters, such as absorption chiller evaporator temperature, geothermal source temperature, turbine input pressure and pinch point temperature on the integrated system performance are investigated to achieve more effi- cient and more effective. Also, the impacts of reference temperature and geothermal water temperature on the integrated system performance are studied in detail. The energetic and exergetic efficiencies of the integrated system are then calculated as 42.59% and 48.24%, respectively. © 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. Introduction The power demand of world is expected to increase consid- erably depending on the results of population growth and increasing demands in the living standards. Nowadays, the fossil fuels (oil, coal and natural gas) are widely used to pro- vide power. In conjunction with this, one may note that fossil fuels are limited and that the world is expected to run out of fossil fuels in the foreseeable future. It is estimated that the world oil production may reach the peak in 2030 [1]. This sit- uation may have a negative impact on the economies of countries, especially the economies of those importing oil and its products. Therefore, it is a necessity to develop clean, sustainable and sufficient energy resources. The geothermal power is the considered as one of the promising alternative energy resources, which can be utilized for electricity, heating, cooling, hydrogen or other synthetic fuels, hot water, etc. production aims. Although some geothermal energy sources are not feasible enough, there are lots of studies evaluating the performances of geothermal energy sources for various potential applica- tions. Single energy production options produce much waste heat and it cannot be recovered in those systems. In order to * Corresponding author. E-mail addresses: yeyuksel@aku.edu.tr (Y.E. Yuksel), muratozturk@sdu.edu.tr (M. Ozturk), Ibrahim.Dincer@uoit.ca (I. Dincer). Available online at www.sciencedirect.com ScienceDirect journal homepage: www.elsevier.com/locate/he international journal of hydrogen energy xxx (2017) 1 e11 http://dx.doi.org/10.1016/j.ijhydene.2017.08.137 0360-3199/© 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved. Please cite this article in press as: Yuksel YE, et al., Thermodynamic analysis and assessment of a novel integrated geothermal energy- based system for hydrogen production and storage, International Journal of Hydrogen Energy (2017), http://dx.doi.org/10.1016/ j.ijhydene.2017.08.137