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Publication Title | Evaluation of an Organic Rankine Cycle Using a Non-Imaging Solar Concentrator for Different Working Fluids

Organic Rankine Cycle

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A. USTAOGLU /APJES III-III (2015) 01-07

Evaluation of an Organic Rankine Cycle Using a Non-Imaging Solar Concentrator for Different Working Fluids

*1Abid Ustaoglu, 2Junnosuke Okajima, 3Xin-Rong Zhang, 2Shigenao Maruyama

1Engineering Department, Bartin University, Bartin, 74100, Turkey

2Institute of Fluid Science, Tohoku University, Sendai, 980-8577, Japan 3Department of Energy and Resources Engineering, Peking University, Beijing 100871, China

Abstract

The Organic Rankine Cycle (ORC) is a feasible technology that can be applied for small-scale power generation in residential and commercial buildings. However, a solar thermal power plant may not compete with that of a thermal power plant using conventional heat source such as coal or natural gas but environmental impact. On the other hand, the cost of a power plant may be reduced by improving the system performance. Using non-imaging concentrators can eliminate the necessity of sun tracking system. Covering the concentrators by evacuated glass tube can reduce the heat loss from the absorber, and improves the effective life-cycle of optical components. Therefore, a non- imaging concentrator was considered as a steam generator of solar power plant. In order to evaluate the system performance, simulations were conducted by using aspen HYSYS software for different working fluids. The maximum performance is obtained for the case of R-141b for the pressure difference of 39 bars to be 15.3%. The best performance improvement is attained for water and R-141b to be about 8.2% and 7.8%, respectively. The working fluid, R-141b shows a better performance due to its lower boiling point and may be preferable for small

scale applications.

Keywords: Organic Rankine Cycle, Solar Power, Non-Imaging, Compound Parabolic Concentrator, Involute Reflector

1. Introduction

may not compete with that of a thermal power plant using conventional heat source such as coal or natural gas but environmental impact [2]. On the other hand, cost of a power plant may be reduced by improving the system performance. For small scale applications and improved performance, Organic Rankine Cycle can be considered. Therefore many studies have been done to develop ORC cycle. Wolpert and Riffat [3] made the study of a low-temperature (<100 °C) solar ORC design using heat pipe solar collectors for electricity generation with hydrogen generation as energy storage system. Tchanche et al. [4] evaluated working fluids in a low-temperature solar ORC by taking into account different parameters: pressures, mass and volume flow rates, efficiencies, cycle heat input, safety and environmental data and found that working fluids with high boiling point like methanol and water are very efficient but the presence of droplets during the expansion process is a drawback. Rayegan and Tao [2] developed a procedure to select the working fluids used in solar Rankine cycles and

The rising demand for energy, the limited source for fossil fuels and their harmful effects in environment (e.g. global warming) have encouraged to the worldwide search for cleaner energy sources. Renewable energy such as geothermal, wind, solar etc. have no bad effect on environment. Among renewable energy sources, solar energy has a special place because it is the most plentiful energy source and the other forms of renewable energies are indirectly powered by sun [1]. Many technologies have been developed to utilize the solar energy for heat and electric generation. The electric generation using solar energy can be done directly by photovoltaic systems and indirectly by solar-thermal power cycle. Although the photovoltaics can be used for small-scale applications, high-temperature thermal power plants that work based on conventional Rankine cycle may not be economic in small-scale application. Moreover, solar thermal power plants

*Corresponding Author: Faculty of Engineering, Department of Mechanical Engineering Bartin University, 74100, Bartin TURKEY. E-mail address: austaoglu@bartin.edu.tr, Phone: +905071716642

DOI: 10.5505/apjes.2015.18209

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