Targeting and Design of Organic Rankine Cycle Systems for Multiple Heat Sources with Simultaneous Working Fluid Selection

This paper explores the optimization cases for overcritical Organic Rankine Cycle (ORC) in various situations. First the ORC optimization in terms of working fluid selection is discussed. In this case, thermal efficiencies for 10 different working fluids have been calculated under certain temperature frames and the results are compared. Second, overcritical optimization case in terms of variation of hot temperature and evaporation pressure is presented. In this overcritical ORC case, the influence of evaporation pressure on ORC thermal efficiency is studied by conducting a case study of R234a, and first 1-D freedom optimization case is discussed within the variation of evaporation pressure. 2-D freedom optimization is also considered, in which the two independent variables, hot temperature and evaporation pressure, are both varied within certain boundaries. This study employs numerical method for this 2-D problem and it is also presented in detail in the case study.

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Working fluid selection and preliminary design of a solar organic Rankine cycle system

Environmental Progress & Sustainable Energy ◽

10.1002/ep.12033 ◽

2014 ◽

Vol 34 (2) ◽

pp. 619-626 ◽

Cited By ~ 14

Author(s):

Wei Gao ◽

Haiwang Li ◽

Guoqiang Xu ◽

Yongkai Quan

Keyword(s):

Organic Rankine Cycle ◽

Rankine Cycle ◽

Working Fluid ◽

Preliminary Design ◽

Cycle System ◽

Working Fluid Selection

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Working Fluid Selection for a Simple System of Low-Temperature Organic Rankine Cycle Plant

Proceedings of the Business Innovation and Engineering Conference 2020 (BIEC 2020) ◽

10.2991/aebmr.k.210727.030 ◽

2021 ◽

Author(s):

Budi Ismoyo ◽

M. Idrus Alhamid ◽

Muswar Muslim

Keyword(s):

Low Temperature ◽

Organic Rankine Cycle ◽

Rankine Cycle ◽

Simple System ◽

Working Fluid ◽

Working Fluid Selection ◽

Selection For

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Performance modelling and greenhouse impact assessment of a micro-ORC energy system working with HFCs, low GWP fluids and mixtures

E3S Web of Conferences ◽

10.1051/e3sconf/202123810002 ◽

2021 ◽

Vol 238 ◽

pp. 10002

Author(s):

Michele Bianchi ◽

Lisa Branchini ◽

Andrea De Pascale ◽

Francesco Melino ◽

Saverio Ottaviano ◽

...

Keyword(s):

Fossil Fuels ◽

Organic Rankine Cycle ◽

Rankine Cycle ◽

Energy System ◽

Working Fluid ◽

Performance Modelling ◽

Cycle Systems ◽

Greenhouse Impact ◽

Greenhouse Emission ◽

Fluid Leak

The worrying effects of climate change have led, in the last decades, to the improvement of innovative solutions for low greenhouse emission energy conversion, among which, is the use of micro-ORC (Organic Rankine Cycle) systems for distributed generation, in the framework of combined heat and power applications and renewables exploitation. However, micro-ORCs environmental impact, due to high GWP (global working potential) working fluid leak rate, is an issue still to overcome. Neverthless the interest in using new low GWP refrigerants and their blends is increasing, new fluids have not yet been properly tested into ORC. Numerical studies reveal that low GWP fluids do not always guarantee the same performance of typically used fluids, leading to indirect emissions related to the use of fossil fuels to compensate the lower power production. This study proposes to investigate performance and impact of an innovative micro-ORC test bench when working with HFCs (HydroFluoroCarbons), low GWP fluids and mixtures, with the main aim of comprehensively evaluating its impact due to both direct and indirect greenhouse gas emissions produced in a typical annual operation.

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