Entropy generation analysis of different solar thermal systems
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REVIEW ARTICLE
Entropy generation analysis of different solar thermal systems Saman Rashidi 1
&
Liu Yang 2 & Ali Khoosh-Ahang 3 & Dengwei Jing 4 & Omid Mahian 5
Received: 3 September 2019 / Accepted: 16 March 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The entropy generation analysis is an approach to optimize the performance of different thermal systems by investigating the related irreversibilities of the system. This paper provides a concise review of the entropy generation analysis performed for different solar thermal energy systems including solar collectors, solar heaters, solar heat exchangers, and solar stills. The mathematical formulation and the equations for calculating the entropy generation are briefly presented. Moreover, main passive techniques including the usage of nanofluids, porous materials, and inserts which are used to improve the efficiency of different solar systems are discussed. It is shown that using entropy generation minimization method is an efficient tool to find the optimal design of solar systems. The current review aims to motivate researchers in the field of solar energy for using entropy generation analysis to reduce the lost work and consequently improving the system performance. Keywords Entropy generation . Solar thermal energy systems . Irreversibilities . Optimization
Introduction In recent years, energy consumption is augmenting because of the industries developments and population increase. Most of the consumed energy in the world is in the form of thermal energy. Usually, fossil fuels are used to supply thermal energy, while they have high costs and generate environmental pollutions. Accordingly, the scientists are seeking for clean and affordable alternatives for fossile fuels to supply the
Responsible Editor: Suresh Pillai * Saman Rashidi [email protected] 1
Department of Energy, Faculty of New Science and Technologies, Semnan University, Semnan, Iran
2
Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing, China
3
Department of Mechanical Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran
4
International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China
5
School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
required thermal energy. One of these alternatives is solar energy as a clean and free energy (Selvaraj et al. 2016). Unfortunately, the thermal efficiency of many solar thermal systems is low, therefore, it is necessary to use active and passive technologies to improve their efficiency (Mahian et al. 2013a; Balachandran et al. 2019; Rashidi et al. 2017, 2018a). During the process of harvesting and thermal conversion of solar energy, some irreversibilities are generate, which can destroy the useful available work and thus decrease the performance of the systems as compa
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