A theoretical pre-assessment of solar photovoltaic electrical production for commerical retail centers
- Van Vuuren, Dirk Johan, Marnewick, Annlizé, Pretorius, Jan-Harm
- Authors: Van Vuuren, Dirk Johan , Marnewick, Annlizé , Pretorius, Jan-Harm
- Date: 2018
- Subjects: Photovoltaic , Renewable energy , Developing economies
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/273140 , uj:29094 , Citation: Van Vuuren, D.J., Marnewick, A. & Pretorius, J.H. 2018. A theoretical pre-assessment of solar photovoltaic electrical production for commerical retail centers.
- Description: Abstract: The successful implementation of solar photovoltaic technology in retail centers has enabled various consumers the ability to generate and consume electricity on the same premises, reducing electricity costs and dependency on currently utilities. The rooftop mounting solution consists of affixing the photovoltaic modules on existing roof structures of retail centres. Accelerated deployment of photovoltaic technologies in recent history (within developing countries) led to various logistical, technical and bureaucratic barriers arising. A comprehensive understanding of these barriers is required to ensure efficient and effective deployment of the technology in developing countries. This study investigates the assessment considerations for the pre-deployment phase of photovoltaic technologies in retail centres. Environmental-, policy-, technical-, and financial factors are identified as the main barriers affecting the financial viability and Return on Investment of such a project. The evolution of this technology within developing countries and the integration of PV and retail centres are investigated. Finally, various financial evaluation criteria are presented to which the viability of the technology is determined. Understanding of the various barriers ensures effective deployment of the technology in retail centres, commercial and residential sectors of an economy.
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- Authors: Van Vuuren, Dirk Johan , Marnewick, Annlizé , Pretorius, Jan-Harm
- Date: 2018
- Subjects: Photovoltaic , Renewable energy , Developing economies
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/273140 , uj:29094 , Citation: Van Vuuren, D.J., Marnewick, A. & Pretorius, J.H. 2018. A theoretical pre-assessment of solar photovoltaic electrical production for commerical retail centers.
- Description: Abstract: The successful implementation of solar photovoltaic technology in retail centers has enabled various consumers the ability to generate and consume electricity on the same premises, reducing electricity costs and dependency on currently utilities. The rooftop mounting solution consists of affixing the photovoltaic modules on existing roof structures of retail centres. Accelerated deployment of photovoltaic technologies in recent history (within developing countries) led to various logistical, technical and bureaucratic barriers arising. A comprehensive understanding of these barriers is required to ensure efficient and effective deployment of the technology in developing countries. This study investigates the assessment considerations for the pre-deployment phase of photovoltaic technologies in retail centres. Environmental-, policy-, technical-, and financial factors are identified as the main barriers affecting the financial viability and Return on Investment of such a project. The evolution of this technology within developing countries and the integration of PV and retail centres are investigated. Finally, various financial evaluation criteria are presented to which the viability of the technology is determined. Understanding of the various barriers ensures effective deployment of the technology in retail centres, commercial and residential sectors of an economy.
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An assessment of photovoltaic electricity production in South African shopping centres
- Authors: Van Vuuren, Dirk Johan
- Date: 2019
- Subjects: Photovoltaic power systems - South Africa , Building-integrated photovoltaic systems - South Africa , Shopping centers - Power supply - South Africa
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/417585 , uj:35369
- Description: Abstract: Please refer to full text to view abstract. , D.Ing. (Engineering Management)
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- Authors: Van Vuuren, Dirk Johan
- Date: 2019
- Subjects: Photovoltaic power systems - South Africa , Building-integrated photovoltaic systems - South Africa , Shopping centers - Power supply - South Africa
- Language: English
- Type: Doctoral (Thesis)
- Identifier: http://hdl.handle.net/10210/417585 , uj:35369
- Description: Abstract: Please refer to full text to view abstract. , D.Ing. (Engineering Management)
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Surface friction behaviour of anodised commercially pure titanium screw assemblies
- Authors: Van Vuuren, Dirk Johan
- Date: 2016
- Subjects: Titanium alloys - Fatigue , Surfaces (Technology) , Surface hardening , Mechanical wear
- Language: English
- Type: Masters (Thesis)
- Identifier: http://ujcontent.uj.ac.za8080/10210/367278 , http://hdl.handle.net/10210/242369 , uj:24996
- Description: M.Ing. (Mechanical Engineering) , Abstract: The document reports on research conducted on titanium bolt assemblies pertaining to the surface friction behaviour between the sliding surfaces of a screw and nut within a fastener assembly. The research was motivated by problems encountered in the dental implant industry whereby the prescribed preload after application of the fixation torque was not achieved. The insufficient preload in the abutment screw led to implant failure due to the dynamic nature of its maxillofacial function and resulting in tissue growth into micro-spaces because of joint separation between the abutment and implant. Commercially pure Grade 4 titanium screws were sulphurically anodised to various oxide layer thicknesses in an attempt to reduce the coefficient of friction within the implant assembly. Testing procedures involved the design and manufacturing of the experimental specimen and testing fixture, anodising of screws, friction coefficient measurement, oxide layer thickness measurement, surface hardness measurement, and surface typography investigation. The design process of the specimen and the testing fixture included various FEA (Finite element analysis) in optimising both of the aforementioned systems of the research and conclusively generate accurate results and findings to compare with each other. Oxide layer thickness measurement was conducted by wavelength reflectance theory and visual measurement of the oxide layer using a scanning electron microscope. The surface hardness of the material was measured using a Vickers hardness tester while surface typography investigation was performed using a scanning electron microscope. Findings of the experiments revealed that the coefficient of friction reduces by 10% to 40% as the anodising voltage is increased up to an oxide layer thickness of 0.4μm, where after the surface friction coefficient increases to eventually surpass the coefficient of friction for untreated fastener assemblies. Untightening examination exhibited similar behaviour to fixation, where the removal friction coefficient reduces to attain a minimum of 0.69 at an oxide thickness of 0.06μm. The untightening coefficient of friction was at a maximum at the increased oxide layer thicknesses of 0.97μm to 3.4μm. Oxide layer thickness investigation revealed that the thickness of the oxide layer increases exponentially as the anodising voltage is increased. The increase in anodising voltage also...
- Full Text:
- Authors: Van Vuuren, Dirk Johan
- Date: 2016
- Subjects: Titanium alloys - Fatigue , Surfaces (Technology) , Surface hardening , Mechanical wear
- Language: English
- Type: Masters (Thesis)
- Identifier: http://ujcontent.uj.ac.za8080/10210/367278 , http://hdl.handle.net/10210/242369 , uj:24996
- Description: M.Ing. (Mechanical Engineering) , Abstract: The document reports on research conducted on titanium bolt assemblies pertaining to the surface friction behaviour between the sliding surfaces of a screw and nut within a fastener assembly. The research was motivated by problems encountered in the dental implant industry whereby the prescribed preload after application of the fixation torque was not achieved. The insufficient preload in the abutment screw led to implant failure due to the dynamic nature of its maxillofacial function and resulting in tissue growth into micro-spaces because of joint separation between the abutment and implant. Commercially pure Grade 4 titanium screws were sulphurically anodised to various oxide layer thicknesses in an attempt to reduce the coefficient of friction within the implant assembly. Testing procedures involved the design and manufacturing of the experimental specimen and testing fixture, anodising of screws, friction coefficient measurement, oxide layer thickness measurement, surface hardness measurement, and surface typography investigation. The design process of the specimen and the testing fixture included various FEA (Finite element analysis) in optimising both of the aforementioned systems of the research and conclusively generate accurate results and findings to compare with each other. Oxide layer thickness measurement was conducted by wavelength reflectance theory and visual measurement of the oxide layer using a scanning electron microscope. The surface hardness of the material was measured using a Vickers hardness tester while surface typography investigation was performed using a scanning electron microscope. Findings of the experiments revealed that the coefficient of friction reduces by 10% to 40% as the anodising voltage is increased up to an oxide layer thickness of 0.4μm, where after the surface friction coefficient increases to eventually surpass the coefficient of friction for untreated fastener assemblies. Untightening examination exhibited similar behaviour to fixation, where the removal friction coefficient reduces to attain a minimum of 0.69 at an oxide thickness of 0.06μm. The untightening coefficient of friction was at a maximum at the increased oxide layer thicknesses of 0.97μm to 3.4μm. Oxide layer thickness investigation revealed that the thickness of the oxide layer increases exponentially as the anodising voltage is increased. The increase in anodising voltage also...
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