Thermodynamic Modeling of the Solar Organic Rankine Cycle with Selected Organic Working Fluids for Cogeneration

  • Suresh Baral Pusan National University, South Korea
  • Kyung Chun Kim School of Mechanical Engineering of Pusan National University in Korea
Keywords: Thermodynamic modeling, Solar organic Rankine cycle, Working fluids, Cogeneration, Heat source temperature, Hot water

Abstract

Fifteen (15) organic fluids were thermodynamically modeled to evaluate their fitness and performance as working fluids in an Organic Rankine Cycle (ORC) based cogeneration system. This article presents the exergy efficiency, thermal efficiency, solar power cycle efficiency, cogeneration efficiency, mass flow rate, heat input, required area of the solar collector and hot water production for the evaluated working fluids the low-temperature (90 and medium-temperature (125 solar organic Rankine cycles. Thermodynamic modeling was carried out using a commercial 1 kW scroll expander, two compact heat exchangers, a diaphragm pump and a solar collector. The article also describes the use of solar ORC technology for electricity generation and producing hot water as cogeneration. Commercial software, Engineering Equation Solver (EES), was used to calculate the operating parameters of the solar ORC. Of the 15 fluids investigated, R134a and R245fa were found to be the most appropriate working fluids for low-temperature and medium-temperature solar ORC cogeneration systems, respectively. RC318 and R123 offer attractive performance but require environmental precautions owing to their high ozone depletion potential (ODP) and high global warming potential (GWP). The article also estimates the hot water production from different working fluids for a period of one year in Busan, South Korea.

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Author Biographies

Suresh Baral, Pusan National University, South Korea

Suresh Baral is a PhD student in the School of Mechanical Engineering, Pusan National University, South Korea. His advisor is Prof. KC Kim. Mr. Baral received his bachelor and master degree in Mechanical Engineering from Institute of Engineering, Pulchowk Campus and Kathmandu University, Nepal respectively. He is permanent faculty member in Pokhara University, Nepal as a Lecturer. His areas of interests are renewable energy, energy conversion technology and Finite Element Methods. He can be reached at baral@pusan.ac.kr

Kyung Chun Kim, School of Mechanical Engineering of Pusan National University in Korea

Kyung Chun Kim (corresponding author) is a Professor in the School of Mechanical Engineering of Pusan National University in Korea. He obtained the Ph.D. degree from the Korea Advanced Institute of Science and Technology (KAIST), Korea, in 1987. He was selected as a member of the National Academy of Engineering of Korea in 2004. His research interests include 3D3C Micro-PIV, Bio-MEMS, turbulent flow measurements based on PIV/LIF, biomedical engineering, POCT development, wind turbines, and organic Rankine cycle system. He can be reached at kckim@pusan.ac.kr

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