Performance Evaluation of Solar Energy-driven Binary Rankine Cycle under Egyptian Climatic Conditions

Document Type : Original Article

Authors

1 Mechanical Power Engineering Department, Faculty of Engineering EL-Mattaria, Helwan University

2 Mechanical Power Engineering Department, Faculty of Engineering EL-Mattaria, Helwan University Energy and Renewable Energy Engineering Program, Faculty of Engineering and Technology, Egyptian Chinese University.

3 Mechanical Engineering Department, College of Engineering and Technology-Cairo Campus, Arab Academy for Science, Technology and Maritime Transport (AASTMT), Egypt.

Abstract

The importance of the Organic Rankine Cycle (ORC) comes from dealing with lowquality energy sources resulting from many thermodynamic processes. This type of 
low-level energy source permanently causes heat emissions, global warming, as well 
as climatic changes in which our world lives today. Re-exploitation of this type of 
energy contributes to the production of the required energy for various industrial 
purposes, as well as the production of electrical power. In this paper, the ORC is 
integrated with the Steam Rankine Cycle (SRC) as a bottoming cycle which can be 
called, the Binary Rankine Cycle (BRC) to generate 5MW net power. As there are 
two fluids used in the system, water in the topping cycle and organic fluid in the 
bottoming cycle. The BRC may utilize solar energy as a heating source. With the 
increasing need for efficient and low-cost energy solutions, it is essential to 
understand the thermal performance of a system built in different climates. The 
performance of the system is carried out and compared with different organic fluids 
R134a, R245fa, and R1234yf at different steam turbine inlet temperatures, pressures, 
and back pressures. The study reveals that the R245fa BRC has the best performance 
followed by the R134af BRC and then the R1234yf BRC. Also, the study aimed to 
determine the best solar collector area in Aswan, Hurghada, & Cairo.

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