Abstract
The organic Rankine cycle (ORC), which generates electric energy using low temperature heat sources, is a promising technology in energy production sector. The ORC, which uses an organic fluid with its lower boiling point and higher vapor pressure than water-steam as a working fluid. The thermal efficiency of an ORC showes the performance of system, depends on system compenents, working fluid and operating conditions. This paper presents an thermodynamics examination of basic ORC and regenerative ORC for waste heat recovery applications using dry organic fluids. R113, R114, R227ea, R245fa and R600a with the boiling points from -16 oC to 48 oC are selected in the analyses. The relationships between the ORC's performance parameters for basic and regenerative technologies and the properties of working fluids are evaluated based on various turbine inlet pressure values. Results show that regenerative ORC has higher thermal efficiency compared with basic ORC. Also, the thermal efficiency increases with the increment of the turbine inlet pressure for both basic ORC and regenerative ORC.
Highlights
Energy is one of the most important sources to sustain life
For the aim of this study five organic fluids were selected in the analysis as a working fluid which were
The selection of working fluids according to appropriate turbine inlet pressure has a significant influence on the performance of an basic and regenerative Organic Rankine cycle (ORC)
Summary
Energy is one of the most important sources to sustain life. Energy management and diversifying of energy resources are considered a significant way to increase energy efficiency, reduce greenhouse gas emissions and energy costs. Fossil fuels continue to meet a dominant share of global energy demand, with implications for the links between energy, the environment and climate change. About 65% of the world energy consumption is supplied from fossil fuels which are increasingly disappearing and damage the ecology in the world. The countries of the world target that renewable energy resources are used in energy conversion technology. Organic Rankine cycle (ORC) which generates electricity from renewable energy resources and waste heat, is an environmentally-friendly technology. The working principal of an ORC is similar to the common vapor Rankine cycle. It uses an organic fluid which has high molecular mass hydrocarbon compound, low critical temperature and pressure instead of water-steam as a working fluid. Useable heat resources in ORC are solar energy, geothermal energy, biomass products, surface seawater and waste heat from various thermal processes
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