Comparative performance of 3-kWp ranges Solar Photovoltaic Systems under varying meteorological conditions in Alice, Eastern Cape Province, South Africa
- Authors: Apeh, Oliver Okechukwu https://orcid.org/0000-0003-4076-0613
- Date: 2021-08
- Subjects: Photovoltaic power systems , Solar energy
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10353/21567 , vital:48888
- Description: PVsystem has recently emerged in South Africa as a way to curb the country’s persistent shortage of electricity. A wide effort for the past few decades have targeted at study, testing and demonstration of PV power systems which was established all over the country as an appropriate measure to tackle transportation, agriculture, industry, commercial as well as domestic activities. In view of these drives, both off-grid and grid-connected PV systems are being applied. However, operating a building with an off-grid system is one of the means to providing the possibility of energy access to places far away from the national grid. As an off-grid choice, 50 W SHS is being distributed to customers in distant rustic parts of the country where grid option is difficult to access. But the SHS of the stated capacity can barely generate 0.3 to 0.4 kWh of electric energy per day, even at the optimal solar radiations. In view of this, more efforts are directed at expanding the off-grid systems to accommodate large rural households in South Africa. This thesis is dedicated to a study on the various configurations and components of PV power plant as a way to enhance electricity generations in South Africa. To this effect, different power plants were considered at SolarWatt park, University of Fort Hare with the aim to conduct a comparative analysis of the charge controllers with respect to the charge and discharge rates of their respective batteries. The grid-connected PV power generation was classified into hybrid PV and grid-assisted PV, while off-grid is a BIPV. These power plants generations were installed for the purpose of research level with a total capacity of 11.4 kW. The off-grid system is made up of HIT modules, FlexMax80 charge controller, Victron energy inverter and M-Molar battery bank. The hybrid and grid-assisted systems each consist of 15 polycrystalline modules and Microcare charge controllers. In addition, hybrid comprises SMA Sunny Island inverter and Trojan battery bank whereas grid-assisted consist of Microcare inverter and Hoppercke battery bank. The first part of the experimental work was monitored, and the meteorological parameters which are ambient temperature, solar radiation, relative humidity and wind speed, were measured and evaluated while electrical parameters includes PV current and voltage, MPPT current and voltage, battery current and voltage and inverter current and voltage were also measured and evaluated in the second part of the experiment. This lasted for a period of four years, starting from 1st January 2017 to 31st December 2020. Similarly, the second aspect was to monitor the electrical performance of the three systems and was performed for a period of six months, starting from January to June 2019. During the second experiment, hybrid and grid-assisted systems were reconfigured to function as off-grid systems. Moreover, a detailed data acquisition system designed to measure and record both meteorological and electrical parameters affecting the performance of the systems. The electrical parameters include PV current and voltage, MPPT current, battery current and voltage and inverter current and voltage. Other parameters in the measurements are; inverter efficiency, active and apparent power, while meteorological parameters include; solar irradiance, ambient temperature, relative humidity, wind speed and direction. The meteorological results show that the maximum and minimum mean amount of global solar radiation was 7.34 kWh/m2/day in December and 3.03 kWh/m2/day in June, respectively, while the average radiation and temperature for the typical year were 4.98 kWh/m2/day and 16.88 oC respectively. The solar radiations obtained are within the range in major places in South Africa. Similarly, an average wind speed of 2.5 m/s is experienced in Alice in a year and average solar radiation of 606.06 W/m2 in summer and 346.17 W/m2 in winter. The three lead-acid battery systems monitored under the electrical aspect are M-Molar, Trojan and Hoppecke battery systems. It was established that the charging current decreases gradually from 27.7 to 18.5 A for the M-Molar while Hoppecke and Trojan deceased respectively from 15 to 10 A and 23 to 13 A at the end of each phase by charging it at the maximum power point of the PV array. It was equally found that the M-Molar battery current has the highest rate of charging and quickest rate of discharging in comparison to the other two batteries. Finally, from the results gotten from this research, we may propose that the solar PV system contributes significantly to the satisfaction of the needed electricity in South Africa. , Thesis (PhD) -- Faculty of Science and Agriculture, 2021
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- Date Issued: 2021-08
Examining the reasons for the exclusion of pregnant learners from school through the school governing body pregnancy policy
- Authors: Bamidele, James Seidu https://orcid.org/0000-0001-6641-0385
- Date: 2017-07
- Subjects: School board members , Pregnant teenagers , Human rights
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/22979 , vital:53375
- Description: Discrimination is a serious violation of human rights and it is strongly condemned by various legal instruments in South Africa. The South African Constitution (1996), Promotion of Administration Justice Act (2000) and Promotion of Equality and Prevention of Unfair Discrimination Act (2000) forbade discrimination and exclusion of pregnant learners from school. In spite of these legislative frameworks, School Governing Body (SGB) continues to exclude pregnant learners from school. SGB claimed that pregnant learners are harmful to other female learners and is becoming a significant barrier to girls’ education. Research shows that learners’ pregnancy is predominant in rural areas, apparently poses a threat to female education (Annual School Survey Report, 2010). The purpose of this dissertation is to establish that SGB lacks power to do so; however, their resistance to the law by excluding the pregnant learners from school is in conflict with the South African Constitution. This dissertation investigated an alternative instrument of legal remedy to reduce the problem of learners’ pregnancy rather than exclusion. The theoretical framework of this study is informed by Public Policy Theory (Ijeoma, 2010). Literatures and scholarly works on education law (Oosthuizen, 2015) and articles on Learners’ pregnancy shall be reviewed (Morell, Bhana & Shefer, 2012). The study followed qualitative research method which utilizes a transformative research paradigm that provides a collective voice for the participants. The data is collected through focused interview and open-ended questions, and subsequently analysed to establish that SGB lacks power to exclude a pregnant learner from school. Finally, the study reveals an alternative instrument of legal remedy to reduce the alarming number of pregnant learners rather than exclusion. , Thesis (MEd) -- Faculty of Education, 2017
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- Date Issued: 2017-07
The effects of social media on relationship patterns among adolescents: A study of students in three selected high schools of Alice in Eastern Cape, South Africa
- Authors: Kalasaru, Onai Ronald https://orcid.org/0000-0002-4984-4250
- Date: 2014-11
- Subjects: Online social networks , Mass media and children
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/25085 , vital:63966
- Description: Technology with the aid of the internet and social media has brought so much into the world, it has managed to reach and develop almost the entire world and this includes remote areas of Sub-Saharan countries like South Africa. These are the least developed and usually the last regions of the world to receive technology. It should be noted that most of the times, technology is bound to make an impact as people use it and this was the motive behind this study which aimed at assessing the effects of socialised media on adolescents who are the future of South Africa. In the study, the researcher aims at discovering whether the use of social media engines among adolescents affects the ways with which they relate with one another. The study which adopted a quantitative methodology was conducted on matriculating students from three randomly selected schools from within and surrounding town of Alice in Eastern Cape South Africa. Respondents were sampled conveniently and data was collected through self-administered questionnaires. From the results and conclusions, it showed that technology has reached South Africa’s remote areas and young people like adolescents have many uses for it. However, they proved that even though they now have technology in form of the internet and social media, it does not affect the ways with which they form and maintained social relations. This means that technology does not have a significant impact in the relationship patterns of adolescents in remote areas of South Africa. , Thesis (MSoc) -- Faculty of Social Sciences and Humanities, 2014
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- Date Issued: 2014-11
Negotiating identity and belonging: perspectives of children living in a disadvantaged community in the Eastern Cape province
- Authors: Ridley, Tamerin Amy
- Date: 2013
- Subjects: Group identity , Self-esteem
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/24813 , vital:63598
- Description: Developing an identity with self-esteem and a sense of self-worth is a child’s fundamental right (Vandenbroek, 2001). To encourage identity formation children need to ask and answer questions such as: ‘Who am I?’, ‘Where do I belong?’ and ‘Is it ok to be who I am?’ A child’s identity is shaped largely by his/her experiences with regards to relationships and belonging within communities and familial structures. However, South Africa faces a host of problems, including poverty, violence, HIV/AIDS, all of which contribute to the breakdown of these familial and community structures. Utilising a participatory action framework, this research aims to provide insight into how children living in a disadvantaged community negotiate identity and belonging. This insight into children’s perceptions of identity and belonging is useful for identifying resources within the community which promote a positive sense of identity and belonging, and also to identify areas where support and intervention are required. , Thesis (MSoc) -- Faculty of Social Sciences and Humanities, 2013
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- Date Issued: 2013
Production and characterization of a bioflocculant from a consortium of bacteria belonging to the halomonas and micrococcus genera
- Authors: Okaiyeto, Kunle (https://orcid.org/0000-0002-7211-714X)
- Date: 2013
- Subjects: Flocculents , Bacteria
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/25822 , vital:64489
- Description: The physicochemical properties of two bioflocculant producing bacteria; Halomonas sp. Okoh and Micrococcus sp. Leo were investigated. The optimum culture conditions for the individual species were determined. All the growth conditions examined for the individual bacteria were similar. Glucose and ammonium sulphate as sole carbon and nitrogen sources respectively resulted in optimum production of bioflocculant. The flocculating activity of the bioflocculants was stimulated when Al3+ was used as the coagulating aid under acidic medium. The information obtained from individual strains was used to produce a bioflocculant from the consortium of the two bacteria. After purification, the bioflocculant yields from 1L fermentation broths were 1.213 g from Halomonas sp. Okoh, 0.738 g from Micrococcus sp. Leo and 3.51 g from the consortium. The chemical analyses of the purified bioflocculants showed that they were glycoproteins. The thermostability property of the bioflocculants was investigated between 50-100oC and the results revealed that they are heat-stable. Fourier transform infrared revealed the presence of hydroxyl, carboxyl and amino groups in the bioflocculant molecules. Scaning electron microscope (SEM) images showed the structure of each bioflocculant(s) and kaolin clay before and after flocculation. From the results obtained, the idea of using the two strains in consortium for bioflocculant production resulted in an improvement in terms of flocculating activity and yield. The bioflocculants appears to have promise as an alternative to chemical flocculants used in various industrial processes such as wastewater treatment and drinking water purification. , Thesis (MA) -- Science and Agriculture, 2013
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- Date Issued: 2013