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Development and optimization of efficient small-scale turbines for organic rankine cycle powered by low-temperature heat sources

Al Jubori, Ayad Mahmoud Salman (2017)
Ph.D. thesis, University of Birmingham.

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Abstract

In this this research, ORC systems using axial, radial-inflow and radial-outflow turbines are investigated for various low-power generation (1-15 kW) applications like domestic, rural and remote off-grid communities. This work presents a new integrated mathematical model for developing efficient axial, radial-inflow and radial-outflow (centrifugal) turbines with low mass flow rate (0.1-0.5 kg/s) using a range of organic working fluids (R14lb, R1234yf, R245fa, R365mfc, isobutene, n-butane and n-pentane). The new mathematical approach integrates mean-line design and 3D CFD analysis with ORC modelling. RANS equations for three-dimensional steady state and viscous flow were solved with k-ro SST turbulence model to predict 3D viscous turbulent flow and turbine performance. With the aim of enhancing the ORC performance by increasing its pressure ratio, novel small-scale two-stage axial and radial outflow turbines are modelled and compared with single-stage axial, radial-inflow and radial-outflow turbines. New performance maps in terms of isentropic efficiency and power output for each turbine configuration are developed in terms of expansion ratio, mass flow rate, rotational speed and turbine size.

Novel optimization technique using multi-objective genetic algorithm was applied to optimize small-scale
single stage axial, radial-inflow and radial-outflow turbines with this flow rate. Experimental study of the ORC
radial-inflow turbine was carried out.

Type of Work:Ph.D. thesis.
Supervisor(s):Al-Dadah, Raya and Mahmoud, Saad
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Mechanical Engineering
Additional Information:

Publications arising from thesis:

Al Jubori A, Daabo A, Al-Dadah RK, Mahmoud S, Ennil AB. Development of microscale axial and radial turbines for low-temperature heat source driven organic Rankine cycle. Energy Conversion and Management 2016; 130, pp. 141-55
http://dx.doi.org/10.1016/j.enconman.2016.10.043

Al Jubori A, Al-Dadah RK, Mahmoud S, Ennil AB, Rahbar K. Three dimensional optimization of small-scale axial turbine for low temperature heat source driven organic Rankine cycle. Energy Conversion and Management 2017; 133, pp. 411-26
http://dx.doi.org/10.1016/j.enconman.2016.10.060

Al Jubori AM, Al-Dadah RK, Mahmoud S, Daabo A. Modelling and parametric analysis of small-scale axial and radial-outflow turbines for Organic Rankine Cycle applications. Applied Energy 2017; 190, pp. 981-96
http://dx.doi.org/10.1016/j.apenergy.2016.12.169

Al Jubori AM, Al-Dadah R, Mahmoud S. An innovative small-scale two-stage axial turbine for low-temperature organic Rankine cycle. Energy Conversion and Management 2017; 144, pp. 18-33
http://dx.doi.org/10.1016/j.enconman.2017.04.039

Al Jubori AM, Al-Dadah R, Mahmoud S. Performance enhancement of a small-scale organic Rankine cycle radial-inflow turbine through multi-objective optimization algorithm. Energy 2017; 131, pp. 297-311
http://dx.doi.org/10.1016/j.energy.2017.05.022

Al Jubori AM, Al-Dadah R, Mahmoud S. New performance maps for selecting suitable small-scale turbine configuration for low-power organic Rankine cycle applications. Journal of Cleaner Production 2017; 161, pp. 931-946
http://dx.doi.org/10.1016/j.jclepro.2017.05.177

Daabo AM, Al Jubori A, Mahmoud S, Al-Dadah RK. Parametric study of efficient small-scale axial and radial turbines for solar powered Brayton cycle application. Energy Conversion and Management 2016; 128, pp. 343-60
http://dx.doi.org/10.1016/j.enconman.2016.09.060

Daabo AM, Al Jubori A, Mahmoud S, Al-Dadah RK. Development of three-dimensional optimization of a small-scale radial turbine for solar powered Brayton cycle application. Applied Thermal Engineering 2017; 111, pp. 718-33
http://dx.doi.org/10.1016/j.applthermaleng.2016.09.147

Daabo AM, Mahmoud S, Al-Dadah RK, Al Jubori AM, Ennil AB. Numerical analysis of small scale axial and radial turbines for solar powered Brayton cycle application. Applied Thermal Engineering 2017; 120, pp. 672-93
http://dx.doi.org/10.1016/j.applthermaleng.2017.03.125

Ennil AB, Al-Dadah R, Mahmoud S, Rahbar K, Al Jubori A. Minimization of loss in small scale axial air turbine using CFD modeling and evolutionary algorithm optimization. Applied Thermal Engineering 2016 5; 102, pp. 841-8
http://dx.doi.org/10.1016/j.applthermaleng.2016.03.077



Subjects:TJ Mechanical engineering and machinery
Institution:University of Birmingham
ID Code:7867
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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