Structural Analysis of Small Scale Radial Turbine for Solar Powered Brayton Cycle Application

2018 ◽  
Author(s):  
Ahmed Mahmood Daabo ◽  
Saad Mahmoud ◽  
Raya K. Al-Dadah
Keyword(s):  
Rotational Speed ◽  
High Efficiency ◽  
Fluid Dynamic ◽  
Small Scale ◽  
Brayton Cycle ◽  
High Rotational Speed ◽  
Radial Turbine ◽  
Solar Powered ◽  
Maximum Increment ◽  
Cfd Optimization

Developing small scale turbines pauses challenges in terms of increased stresses due to high rotational speed leading to increase in component thicknesses and turbine overall weight. Therefore this study assesses both; the structural and aerodynamic performance of a Small Scale Radial Turbine SSRT by integrating finite-element methods FEM and Computational Fluid Dynamic CFD. Using Vista preliminary design model in ANSYS and detailed 3D CFD optimization, SSRT with 1–5 kW power for solar powered Brayton cycle was developed with high efficiency of 89.2%. Then both; the turbine’s hub and blades were structurally analysed under various loading conditions to investigate the effect of various rotational speeds and blade shapes on the stress distribution and deformation of the blades. The results of the current study showed that a maximum increment of 65% stress and 57% deformation was noticed when reaching the maximum studied rotational speed at inlet air temperature of 450 K.

scholarly journals Numerical analysis of small scale axial and radial turbines for solar powered Brayton cycle application

2017 ◽  
Vol 120 ◽  
pp. 672-693 ◽  
Author(s):  
Ahmed M. Daabo ◽  
Saad Mahmoud ◽  
Raya K. Al-Dadah ◽  
Ayad M. Al Jubori ◽  
Ali Bhar Ennil
Keyword(s):  
Numerical Analysis ◽  
Small Scale ◽  
Brayton Cycle ◽  
Solar Powered ◽  
Radial Turbines

Design and Performance Evaluation of a Trigeneration System Incorporating Hydraulic Storage and an Inverted Brayton Cycle

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
Matthew Blieske ◽  
J. E. D. Gauthier ◽  
X. Huang
Keyword(s):  
High Efficiency ◽  
Small Scale ◽  
Brayton Cycle ◽  
Energy Prices ◽  
Air Conditioner ◽  
Single Family ◽  
Modes Of Operation ◽  
External Temperature ◽  
Generation Costs ◽  
The Individual

To bring the economic benefit of trigeneration to small-scale users without incorporating expensive components, an inverted Brayton cycle (IBC) is employed, which makes use of the expander section already present in a microturbine. An air accumulator provides pressurized air, which is passed through the expander section of the same microturbine used to charge the accumulator. The air passing through the IBC is cooled due to expansion, simultaneously providing power and cooling the flow. As the microturbine is indirectly fired, the flow passing through the engine or IBC can be directly vented into the household—eliminating the need for additional heat exchangers. The size of the cycle studied is on the order of 10 kW(e), suitable for a domestic household; however, the system is easily scaled for larger commercial applications. The majority of the components in the system being studied are “off the shelf” products. A feasibility study was conducted to ensure that the proposed system is economically competitive with systems currently used, such as individual generation provided by an air conditioner (A/C), a high efficiency natural gas (NG) furnace, and grid power. Simulations were run for a full year based on the actual external temperature and the electrical and thermal loads for a single family detached dwelling located in Winnipeg, Canada. Performance data were generated using MATLAB™ while the economic performance was determined with time-based simulations conducted using SIMULINK™. The system is designed to allow energy islanding by providing for all household energy needs throughout the year; however, integration with a power grid is optional. It was found that the operating costs for the proposed trigeneration system in an energy islanding mode of operation were equivalent to or less than individual generation (A/C unit, NG furnace, and grid power) during heating modes of operation and were more expensive for cooling modes of operation. The yearly energy cost for the trigeneration system exceeded the individual generation costs by 30–40%; however, there remains much room for improvement to the trigeneration concept. All economic data were based on fair market energy prices as found in central Canada.

Parametric study of efficient small-scale axial and radial turbines for solar powered Brayton cycle application

2016 ◽  
Vol 128 ◽  
pp. 343-360 ◽  
Author(s):  
Ahmed M. Daabo ◽  
Ayad Al Jubori ◽  
Saad Mahmoud ◽  
Raya K. Al-Dadah
Keyword(s):  
Parametric Study ◽  
Small Scale ◽  
Brayton Cycle ◽  
Solar Powered ◽  
Radial Turbines

System Matched 3D Radial Impeller Design With Variable Inlet Angle Distributions

2012 ◽  
Author(s):  
Matthias Semel ◽  
Henrik Smith ◽  
Philipp Epple ◽  
Oliver Litfin ◽  
Antonio Delgado ◽  
...  
Keyword(s):  
Rotational Speed ◽  
High Efficiency ◽  
Low Flow ◽  
Hydraulic Efficiency ◽  
Linear Variation ◽  
Cfd Simulations ◽  
High Rotational Speed ◽  
Flow Rates ◽  
Lower Flow ◽  
Inlet Angle

In vacuum cleaners radial impellers with high rotational speed are very often used. A high rotational speed is connected with a best efficiency point of the radial impeller at a high flow rate. This is contrary to the working point of the whole system. Thus there is need for a radial impeller designs having a high efficiency at low flow rates under the restriction of a high rotational speed. One important parameter connected to the hydraulic efficiency characteristics of the radial impeller is the blade inflow angle β1. In order to shift the best efficiency point towards lower flow rates radial impellers with double curved blades and a linear β1 distribution were designed and CFD simulations were done in order to investigate the effect of this approach. A linear variation of the inflow angle β1 enables the designer to shift the efficiency characteristics of the impeller towards lower flow rates with a gain in hydraulic efficiency and pressure increase.

scholarly journals REVIEW OF ORGANIC RANKINE CYCLE USED IN SMALL- SCALE APPLICATION

2020 ◽  
Vol 7 (1) ◽  
pp. 52-63
Author(s):  
Ali A. F. Al-Hamadani ◽  
Aya Haitham. A. Kareem
Keyword(s):  
Heat Exchanger ◽  
High Efficiency ◽  
Waste Heat ◽  
Organic Rankine Cycle ◽  
Rankine Cycle ◽  
Small Scale ◽  
Heat Sources ◽  
Radial Turbine ◽  
Temperature Method ◽  
Energy From Waste

Organic Rankine cycle an alternative way of generating energy from waste heat, fuel and gases at low-temperature. Method (ORC) proved successful and high efficiency to reduce environmental pollution, fuel consumption and convert low to medium heat sources. The paper will be presenting a review investigation on the organic Rankine cycle(ORC), cycle Background, (ORC) configuration, and selecting of working fluids and experimental studied of expansion apparatuses, which are classified into two type volumetric type such as (expander of rotary vane, scroll, reciprocating piston expander and screw) velocity kind (for example axial and radial turbine). Heat exchanger and expander apparatuses are considered economically expensive parts in (ORC).

Design and Performance Evaluation of a Trigeneration System Incorporating Hydraulic Storage and an Inverted Brayton Cycle

2008 ◽  
Author(s):  
Matthew Blieske ◽  
J. E. D. Gauthier ◽  
X. Huang
Keyword(s):  
High Efficiency ◽  
Small Scale ◽  
Brayton Cycle ◽  
Energy Prices ◽  
Air Conditioner ◽  
Single Family ◽  
Modes Of Operation ◽  
External Temperature ◽  
Generation Costs ◽  
The Individual

To bring the economic benefit of trigeneration to small-scale users without incorporating expensive components, an inverted Brayton cycle (IBC) is employed which makes use of the expander section already present in a microturbine. An air accumulator provides pressurized air, which is passed through the expander section of the same microturbine used to charge the accumulator. The air passing through the IBC is cooled due to expansion, simultaneously providing power and cooling flow. As the microturbine is indirectly fired, the flow passing through the engine or IBC can be directly vented into the household; eliminating the need for additional heat exchangers. The size of the cycle studied is on the order of 10 kW(e), suitable for a domestic household, however the system is easily scaled for larger commercial applications. The majority of the components in the system studied are ‘off the shelf’ products. A feasibility study was conducted to ensure the proposed system is economically competitive with systems currently used, such as individual generation provided by an air conditioner, high efficiency natural gas furnace, and grid power. Simulations were run for a full year based on actual external temperature, electrical, and thermal loads for a single family detached dwelling located in Winnipeg, Canada. Performance data was generated using Matlab™ while economic performance was determined with time-based simulations conducted using Simulink™. The system is designed to allow energy islanding by providing for all household energy needs throughout the year, however integration with a power grid is optional. It was found the operating costs for the proposed trigeneration system in an energy islanding mode of operation were marginally higher than individual generation (A/C unit, NG furnace, grid power) during heating modes of operation, and more expensive for cooling modes of operation. The yearly energy cost for the trigeneration system exceeded the individual generation costs by 30 to 40%, however there remains much room for improvement to the trigeneration concept. All economic data was based upon fair market energy prices as found in central Canada.

Grinding Combination of Electrochemical Smoothing On SKH 51 Surface

2008 ◽  
Vol 389-390 ◽  
pp. 410-416
Author(s):  
Pai Shan Pa
Keyword(s):  
Current Density ◽  
Rotational Speed ◽  
High Efficiency ◽  
Great Contribution ◽  
High Rotational Speed ◽  
Workpiece Surface ◽  
Design Change ◽  
Full Form ◽  
Electrochemical Smoothing ◽  
Thin Electrode

A new finish mode combination of grinding and electrochemical smoothing executes a finish processes on SKH 51 surface is investigated. In the experiment, a high rotational speed of finish tool produces a better finish. A thin electrode associated with higher current density provides a larger discharge space for a better finish. The design change from a full form finish-tool to a partial finish-tool leads more discharge space, which creates better finishes than full form tool. It is a great contribution that the synchronous finish processes has a high efficiency than the electrochemical smoothing to make the workpiece surface smooth and bright.

scholarly journals Design and Optimization of a Radial Inflow Turbine for Use with a Low Temperature ORC

Energies ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 8526
Author(s):  
Richard Symes ◽  
Tchable-Nan Djaname ◽  
Michael Deligant ◽  
Emilie Sauret
Keyword(s):  
Fuel Cell ◽  
Low Temperature ◽  
High Efficiency ◽  
Waste Heat ◽  
Fluid Dynamic ◽  
Organic Rankine Cycle ◽  
Pem Fuel Cells ◽  
Small Scale ◽  
Heat Sources ◽  
Radial Inflow Turbine

This study aims to design and optimize an organic Rankine cycle (ORC) and radial inflow turbine to recover waste heat from a polymer exchange membrane (PEM) fuel cell. ORCs can take advantage of low-quality waste heat sources. Developments in this area have seen previously unusable, small waste heat sources become available for exploitation. Hydrogen PEM fuel cells operate at low temperatures (70 °C) and are in used in a range of applications, for example, as a balancing or backup power source in renewable hydrogen plants. The efficiency of an ORC is significantly affected by the source temperature and the efficiency of the expander. In this case, a radial inflow turbine was selected due to the high efficiency in ORCs with high density fluids. Small scale radial inflow turbines are of particular interest for improving the efficiency of small-scale low temperature cycles. Turbines generally have higher efficiency than positive displacement expanders, which are typically used. In this study, the turbine design from the mean-line analysis is also validated against the computational fluid dynamic (CFD) simulations conducted on the optimized machine. For the fuel cell investigated in this study, with a 5 kW electrical output, a potential additional 0.7 kW could be generated through the use of the ORC. The ORC’s output represents a possible 14% increase in performance over the fuel cell without waste heat recovery (WHR).

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