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Publication Title | Combined Solar-Geothermal Power Generation using Organic Rankine Cycle

Organic Rankine Cycle

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JJMIE

Jordan Journal of Mechanical and Industrial Engineering

Volume 10 Number 1, March.2016 ISSN 1995-6665 Pages 1- 9

Combined Solar-Geothermal Power Generation using Organic Rankine Cycle

Ahmad Sakhrieha,b *, Waleed Shreimb, Hatem Fakhruldeenb, Hasan Hasanb, Ahmed Al-Salaymehb

aDepartment of Mechanical and Industrial Engineering, American University of Ras Al Khaimah, 10021 UAE bMechanical Engineering Department, The University of Jordan, Amman 11942, Jordan

Received 10 June 2015 Accepted 13 Feb 2016

Abstract

This research investigates the possibility of power generation from geothermal and solar heat resources in Jordan using Organic Rankine Cycle (ORC). A comprehensive thermodynamic modelling and analysis is done in order to choose the appropriate fluid for the considered application.

Fluid selection process using EES software was conducted on sixteen fluids taking into account high side and low side temperature and pressure to be the most important parameters. A step by step thermodynamic modelling with the aid of both EES and CHEMCAD software was conducted simultaneously. Several improvements have been done on the cycle to achieve the most economical and efficient design. For the selected cycle, different components were sized and defined.

It was found that R600 is the most suitable fluid for application under study. The use of geothermal water as a heat source was found insufficient to generate power due to low temperature of the geothermal water. The open feed heater solar and geothermal Organic Rankine Cycle was found to be the most suitable for power generation for the selected site conditions.

© 2016 Jordan Journal of Mechanical and Industrial Engineering. All rights reserved Keywords: Geothermal Energy, Solar Energy, Organic Rankine Cycle, Combined Geothermal-Solar, Organic Fluid Selection.

1. Introduction

The Hashemite Kingdom of Jordan occupies a strategic location in the Middle East at an important crossroads for regional electrical energy integration. It is a developing non-oil producing country, where its energy requirements are obtained by importing oil from neighboring countries. The cost of importing energy creates a heavy financial burden on the national economy. Furthermore, the levels of electricity consumption are expected to double in the next 15 years. Renewable energy applications in Jordan include solar water heaters, solar photovoltaic, wind farms, hydropower and biogas. The total contribution of renewable energy in Jordan is about 3% of the total energy mix. The national energy strategy aims to integrate renewable energy in the energy system by allocating 7% of the total energy from renewable energy sources within the next 7 years. Moving forward looking for new energy technologies that can decrease our dependence on fossil fuels are needed. Organic Rankine Cycle (ORC) seems to be an important technology that can be used in future. It has a wide variety of applications that include power generation form low grade temperature energy sources. The cycle is compatible with a variety of heat sources such

as exhaust, industrial process waste heat, geothermal energy sources, and solar energy.

In the past twenty years, because of its feasibility and reliability, Organic Rankine Cycle has received widespread attentions and researches [1]. ORC is a technology that can convert thermal energy at relative low temperatures in the range of 60 to 350 °C to electricity and can therefore play an important role to improve the energy efficiency of new or existing applications. Beside industrial waste heat, alternative heat sources such as solar and geothermal energy as well as biomass ORC can be applied. Zahra et al modeled and optimized an Organic Rankine Cycle for diesel engine waste heat recovery. In their work four refrigerants including R123, R134a, R245fa and R22 are selected and studied as working fluids. Then, the fast and elitist NSGA-II (Non-dominated Sorting Genetic Algorithm) is applied to maximize the thermal efficiency and minimize the total annual cost (sum of investment cost, fuel cost and environmental cost) simultaneously [2]. A two-stage organic Rankine cycle concept with internal heat recovery was presented by Dominik et al [3]. Leonardo studied a 100 kWe hybrid plant consisting of gasification system, solid oxide fuel cells and Organic Rankine Cycle. More than hundred fluids are considered as possible alternative for the organic cycle using non-ideal equations of state (or state-of-the-art

* Corresponding author e-mail: ahmad.sakhrich@aurak.ac.ae.

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