Pub Date : 2021-02-18DOI: 10.17159/2413-3051/2021/V32I1A7935
S. Tangwe, K. Kusakana
Air source heat pump (ASHP) water heaters are efficient devices for sanitary hot water heating. The coefficient of performance (COP) of the air to water heat pump (AWHP) is constantly lower than that of the corresponding ASHP unit. The study focused on determining the COP of both the ASHP unit and the AWHP. This was achieved by the implementation of both experimental and simulation methods, with the help of a data acquisition system and the REFPROP software. The system comprised of a 1.2 kW split type ASHP unit and a 150 L high pressure geyser. A power meter, flow meters, temperature sensors, pressure sensors, ambient temperature and relative humidity sensor were installed at precise locations on the split type AWHP. Controlled volumes of 150, 50 and 100 L were drawn off from the AWHP during the morning, afternoon and evening for a year. The average COP for the summer and winter, in terms of the input electrical and output thermal energies of the AWHP were 3.02 and 2.30. The COPs of the ASHP unit, in terms of the change in the enthalpies of the refrigerant at the inlet and the outlet of the condenser and the evaporator, were 3.52 and 2.65 respectively. The study showed that the difference between the COP of the ASHP unit and that of the AWHP could be ascribed to the electrical energy consumed by the fan and the water circulation pump during the vapour compression refrigeration cycles. The work provides an energy optimisation opportunity to the manufacturers of this technology, helping to enhance the efficiency and COP of ASHP water heaters.
{"title":"Evaluation of the coefficient of performance of an air source heat pump unit and an air to water heat pump","authors":"S. Tangwe, K. Kusakana","doi":"10.17159/2413-3051/2021/V32I1A7935","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/V32I1A7935","url":null,"abstract":"Air source heat pump (ASHP) water heaters are efficient devices for sanitary hot water heating. The coefficient of performance (COP) of the air to water heat pump (AWHP) is constantly lower than that of the corresponding ASHP unit. The study focused on determining the COP of both the ASHP unit and the AWHP. This was achieved by the implementation of both experimental and simulation methods, with the help of a data acquisition system and the REFPROP software. The system comprised of a 1.2 kW split type ASHP unit and a 150 L high pressure geyser. A power meter, flow meters, temperature sensors, pressure sensors, ambient temperature and relative humidity sensor were installed at precise locations on the split type AWHP. Controlled volumes of 150, 50 and 100 L were drawn off from the AWHP during the morning, afternoon and evening for a year. The average COP for the summer and winter, in terms of the input electrical and output thermal energies of the AWHP were 3.02 and 2.30. The COPs of the ASHP unit, in terms of the change in the enthalpies of the refrigerant at the inlet and the outlet of the condenser and the evaporator, were 3.52 and 2.65 respectively. The study showed that the difference between the COP of the ASHP unit and that of the AWHP could be ascribed to the electrical energy consumed by the fan and the water circulation pump during the vapour compression refrigeration cycles. The work provides an energy optimisation opportunity to the manufacturers of this technology, helping to enhance the efficiency and COP of ASHP water heaters.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"19 1","pages":"27-40"},"PeriodicalIF":0.0,"publicationDate":"2021-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78429958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-18DOI: 10.17159/2413-3051/2021/V32I1A7792
M. Mpholo, M. Mothala, L. Mohasoa, D. Eager, R. Thamae, T. Molapo, T. Jardine
This study undertook a 2010 to 2030 electricity demand profile for Lesotho, with 2010 used as the base year. The demand forecast was modelled using the International Atomic Energy Agency Model for Analysis of Energy Demand, largely because of its proven ability to accurately forecast demand in developing economies based on socio-economic, technology and demography variables. The model correlates well with the actual data, where data exists, and predicts that by 2030 Lesotho will achieve a national electrification rate of 54.2%, with 95% for urban households and 14% for rural households, up from 19.4%, 54.1% and 1.8% respectively in the base year. Moreover, in the same period, the forecast for the most likely scenario gives the following results: the maximum demand will increase to 211 MW from 121 MW; the annual average household energy consumption will continue its decline to 1 009 kWh/household from 1 998 kWh/household; and the total consumption will increase to 1 128 284 MWh from 614 868 MWh. The overall low growth rate is attributed to the consistently declining average household consumption that is contrary to international norms. The forecast results gave a root mean square percentage error of 1.5% and mean absolute percentage error of 1.3%, which implied good correlation with the actual data and, hence, confidence in the accuracy of the results.
{"title":"Lesotho electricity demand profile from 2010 to 2030","authors":"M. Mpholo, M. Mothala, L. Mohasoa, D. Eager, R. Thamae, T. Molapo, T. Jardine","doi":"10.17159/2413-3051/2021/V32I1A7792","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/V32I1A7792","url":null,"abstract":"This study undertook a 2010 to 2030 electricity demand profile for Lesotho, with 2010 used as the base year. The demand forecast was modelled using the International Atomic Energy Agency Model for Analysis of Energy Demand, largely because of its proven ability to accurately forecast demand in developing economies based on socio-economic, technology and demography variables. The model correlates well with the actual data, where data exists, and predicts that by 2030 Lesotho will achieve a national electrification rate of 54.2%, with 95% for urban households and 14% for rural households, up from 19.4%, 54.1% and 1.8% respectively in the base year. Moreover, in the same period, the forecast for the most likely scenario gives the following results: the maximum demand will increase to 211 MW from 121 MW; the annual average household energy consumption will continue its decline to 1 009 kWh/household from 1 998 kWh/household; and the total consumption will increase to 1 128 284 MWh from 614 868 MWh. The overall low growth rate is attributed to the consistently declining average household consumption that is contrary to international norms. The forecast results gave a root mean square percentage error of 1.5% and mean absolute percentage error of 1.3%, which implied good correlation with the actual data and, hence, confidence in the accuracy of the results.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"34 1","pages":"41-57"},"PeriodicalIF":0.0,"publicationDate":"2021-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85411896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-18DOI: 10.17159/2413-3051/2021/V32I1A9052
E. Tyler, B. Cohen
The implementation of climate change policy in South Africa inevitably requires decision-makers to navigate issues of development. This paper explores some of the implications of this requirement by examining the case of a proposed new independent coal-fired power producing plant, Khanyisa, in the province of Mpumalanga from the perspective of complexity studies, an emerging transdisciplinary field. Complexity thinking re-casts the Khanyisa project in a whole-system view, encouraging an active consideration of scale, perspectives, different knowledges, and cumulative impacts. In so doing, tensions both between and within dimensions of climate mitigation and development are quickly revealed, a complexity which is theorised in complexity studies as the raw material for systemic transformation. This wholesystem conceptualisation also undermines incremental and relative arguments that Khanyisa mitigates greenhouse gas emissions. Further, the complex systemic property of non-linearity suggests that the Khanyisa decision is more significant than its power generation capacity indicates. Attention to the conceptual simplification inherent in ‘development’ highlights what is lost through such simplification, as well as what is gained, and by whom. Finally, complexity thinking foregrounds the multiple scales at which the systemic climate mitigation and development implications of Khanyisa play out. Currently there is very little policy-making capacity nationally, regionally or in eMalahleni to look at alternatives, or ‘spaces of possibility’ through the complexity lens for both development and climate mitigation. This case argues that new policy processes are needed, which go far beyond policy and regulatory processes steeped in path dependencies and incrementalism.
{"title":"A complex systems view of climate and development issues in South African coal power expansion","authors":"E. Tyler, B. Cohen","doi":"10.17159/2413-3051/2021/V32I1A9052","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/V32I1A9052","url":null,"abstract":"The implementation of climate change policy in South Africa inevitably requires decision-makers to navigate issues of development. This paper explores some of the implications of this requirement by examining the case of a proposed new independent coal-fired power producing plant, Khanyisa, in the province of Mpumalanga from the perspective of complexity studies, an emerging transdisciplinary field. Complexity thinking re-casts the Khanyisa project in a whole-system view, encouraging an active consideration of scale, perspectives, different knowledges, and cumulative impacts. In so doing, tensions both between and within dimensions of climate mitigation and development are quickly revealed, a complexity which is theorised in complexity studies as the raw material for systemic transformation. This wholesystem conceptualisation also undermines incremental and relative arguments that Khanyisa mitigates greenhouse gas emissions. Further, the complex systemic property of non-linearity suggests that the Khanyisa decision is more significant than its power generation capacity indicates. Attention to the conceptual simplification inherent in ‘development’ highlights what is lost through such simplification, as well as what is gained, and by whom. Finally, complexity thinking foregrounds the multiple scales at which the systemic climate mitigation and development implications of Khanyisa play out. Currently there is very little policy-making capacity nationally, regionally or in eMalahleni to look at alternatives, or ‘spaces of possibility’ through the complexity lens for both development and climate mitigation. This case argues that new policy processes are needed, which go far beyond policy and regulatory processes steeped in path dependencies and incrementalism.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"20 1","pages":"1-13"},"PeriodicalIF":0.0,"publicationDate":"2021-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78000370","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-02-17DOI: 10.17159/2413-3051/2021/V32I1A8086
N. Nkosi, R. Burger, N. Matandirotya, C. Pauw, S. Piketh
Domestic solid fuel combustion remains a key contributor to indoor and ambient air pollution in low-income settlements. Understanding solid-fuel cost perceptions and burning patterns variability is required for developing sustainable energy policies and applicable site-specific intervention strategies to effectively improve ambient air quality. The purpose of the study was to understand domestic solid fuel use dynamics and trends in KwaDela, a low-income residential area in Mpumalanga. Data were gathered using surveys, questionnaires, observations, and temperature sensors. Findings were that there are two main local sources of wood and coal within the settlement and each household was estimated to consume 1 800 to 2 992.5 kg of coal annually. The maximum amount of coal used per burning event was 9.3 kg, with an average of 4 kg and a standard deviation of ±2.5 kg. Coal and wood purchase price varied depending on their sources, but were cheaper than electricity. In winter, the burning events are longer (four to six hours) than in summer and more (one to three) per day, and start earlier (from 03:00 and 15:30) mainly due to space-heating needs. Cooking, space-heating and boiling water are the major household needs that drive the use of solid fuels in electrified low-income residential areas. The key to improving air quality in such areas is integrating fuel use intervention methods that the residents can afford and are readily accessible.
{"title":"Solid fuel use in electrified low-income residential areas in South Africa: The case of KwaDela, Mpumalanga","authors":"N. Nkosi, R. Burger, N. Matandirotya, C. Pauw, S. Piketh","doi":"10.17159/2413-3051/2021/V32I1A8086","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/V32I1A8086","url":null,"abstract":"Domestic solid fuel combustion remains a key contributor to indoor and ambient air pollution in low-income settlements. Understanding solid-fuel cost perceptions and burning patterns variability is required for developing sustainable energy policies and applicable site-specific intervention strategies to effectively improve ambient air quality. The purpose of the study was to understand domestic solid fuel use dynamics and trends in KwaDela, a low-income residential area in Mpumalanga. Data were gathered using surveys, questionnaires, observations, and temperature sensors. Findings were that there are two main local sources of wood and coal within the settlement and each household was estimated to consume 1 800 to 2 992.5 kg of coal annually. The maximum amount of coal used per burning event was 9.3 kg, with an average of 4 kg and a standard deviation of ±2.5 kg. Coal and wood purchase price varied depending on their sources, but were cheaper than electricity. In winter, the burning events are longer (four to six hours) than in summer and more (one to three) per day, and start earlier (from 03:00 and 15:30) mainly due to space-heating needs. Cooking, space-heating and boiling water are the major household needs that drive the use of solid fuels in electrified low-income residential areas. The key to improving air quality in such areas is integrating fuel use intervention methods that the residents can afford and are readily accessible.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"24 1","pages":"58-67"},"PeriodicalIF":0.0,"publicationDate":"2021-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72449740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.17159/2413-3051/2021/v32i3a7781
Mahlodi Esther Masekela, K. Semenya
Despite improved electrification rates and several government policies introduced to encourage rural households to switch from traditional to modern fuels, most South African households still rely on firewood for their energy needs. This study sought to assess the factors that influence the use of firewood in Ga-Malahlela village in the Limpopo province. To this end, a structured questionnaire was administered to 67 households. Microsoft Excel and the Statistical Package for Social Sciences were used to code and log in the data. The chi-square test was used to determine the relationship between the choice of energy source(s) and socio-economic factors. It was established that firewood was still widely used: by 61% of the participants for cooking, by 64% for space heating, and by 46% for water heating. For lighting, electricity was used by 98.5% of the participants, while liquefied petroleum gas was used by 1.5%. The dependency on firewood was mainly due to the socio-economic status of the surveyed households, which included income, education level, household size, and preference. Rural firewood reliance continues, due to socio-economic factors such as indigence, preference, and the inaccessibility of services like free basic electricity. It is therefore recommended that the Polokwane Local Municipality should play a part in assisting poor communities with cleaner, cost-effective fuel alternatives such as solar energy, biogas, and liquefied petroleum gas.
尽管电气化率有所提高，政府也出台了一些政策，鼓励农村家庭从传统燃料转向现代燃料，但大多数南非家庭仍然依赖柴火来满足他们的能源需求。本研究旨在评估影响林波波省Ga-Malahlela村木柴使用的因素。为此目的，对67个家庭进行了结构化问卷调查。使用Microsoft Excel和Statistical Package for Social Sciences对数据进行编码和登录。采用卡方检验确定能源选择与社会经济因素之间的关系。调查表明，柴火仍然被广泛使用:61%的参与者用于做饭，64%用于空间供暖，46%用于水加热。在照明方面，98.5%的参与者使用电力，而使用液化石油气的比例为1.5%。对柴火的依赖主要取决于被调查家庭的社会经济地位，包括收入、教育水平、家庭规模和偏好。由于贫困、偏好和无法获得免费基本电力等服务等社会经济因素，农村继续依赖柴火。因此，建议Polokwane地方市政当局发挥作用，协助贫穷社区使用更清洁、成本效益高的替代燃料，如太阳能、沼气和液化石油气。
{"title":"Factors influencing the use of firewood post-electrification in rural South Africa: The case of Ga-Malahlela village","authors":"Mahlodi Esther Masekela, K. Semenya","doi":"10.17159/2413-3051/2021/v32i3a7781","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/v32i3a7781","url":null,"abstract":"Despite improved electrification rates and several government policies introduced to encourage rural households to switch from traditional to modern fuels, most South African households still rely on firewood for their energy needs. This study sought to assess the factors that influence the use of firewood in Ga-Malahlela village in the Limpopo province. To this end, a structured questionnaire was administered to 67 households. Microsoft Excel and the Statistical Package for Social Sciences were used to code and log in the data. The chi-square test was used to determine the relationship between the choice of energy source(s) and socio-economic factors. It was established that firewood was still widely used: by 61% of the participants for cooking, by 64% for space heating, and by 46% for water heating. For lighting, electricity was used by 98.5% of the participants, while liquefied petroleum gas was used by 1.5%. The dependency on firewood was mainly due to the socio-economic status of the surveyed households, which included income, education level, household size, and preference. Rural firewood reliance continues, due to socio-economic factors such as indigence, preference, and the inaccessibility of services like free basic electricity. It is therefore recommended that the Polokwane Local Municipality should play a part in assisting poor communities with cleaner, cost-effective fuel alternatives such as solar energy, biogas, and liquefied petroleum gas.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"40 5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75320741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.17159/2413-3051/2021/v32i3a10364
M. A. Sam, D. Oyedokun, K. O. Akpeji
Distribution networks in Southern Africa and elsewhere are witnessing an unprecedented growth of consumer-side distributed generation (DG) courtesy of governmental interventions to maximise the utilisation of renewable energy resources through low-carbon grid-edge technologies. To deal with the increasing adoption of consumer-side DG, distribution network operators need to conduct technical studies to foster an understanding of the benefits and impacts of DG and the hosting capacity (HC) of existing distribution networks. This will aid the implementation of measures to manage grid exports. Using a distribution network in Namibia as a case study, this paper presents an algorithm for assessing the HC of consumer-side DG in existing distribution networks that are situated in areas anticipating high and uniform uptake of DG. The algorithm is a hybrid of deterministic and probabilistic methods. The uniqueness of the algorithm is the concept of calculating monthly HC. The algorithm was tested on a real existing residential distribution network and the results confirmed that HC varies monthly. However, the practical implementation of monthly HC requires upgrades to existing inverter technology, which currently contains a single export limit functionality. This opens the possibility to drive innovation in the inverter technology to develop a date-based multiple export limit functionality.
{"title":"Design and application of a distributed generation hosting capacity algorithm","authors":"M. A. Sam, D. Oyedokun, K. O. Akpeji","doi":"10.17159/2413-3051/2021/v32i3a10364","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/v32i3a10364","url":null,"abstract":"Distribution networks in Southern Africa and elsewhere are witnessing an unprecedented growth of consumer-side distributed generation (DG) courtesy of governmental interventions to maximise the utilisation of renewable energy resources through low-carbon grid-edge technologies. To deal with the increasing adoption of consumer-side DG, distribution network operators need to conduct technical studies to foster an understanding of the benefits and impacts of DG and the hosting capacity (HC) of existing distribution networks. This will aid the implementation of measures to manage grid exports. Using a distribution network in Namibia as a case study, this paper presents an algorithm for assessing the HC of consumer-side DG in existing distribution networks that are situated in areas anticipating high and uniform uptake of DG. The algorithm is a hybrid of deterministic and probabilistic methods. The uniqueness of the algorithm is the concept of calculating monthly HC. The algorithm was tested on a real existing residential distribution network and the results confirmed that HC varies monthly. However, the practical implementation of monthly HC requires upgrades to existing inverter technology, which currently contains a single export limit functionality. This opens the possibility to drive innovation in the inverter technology to develop a date-based multiple export limit functionality.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90703893","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.17159/2413-3051/2021/v32i3a11463
M. Mulenga, A. Roos
Wood fuel, charcoal, and firewood comprise over 70 percent of the national energy consumption in Zambia, as only about 25 percent of the population has access to electricity. Replacing charcoal braziers with cookstoves using sawdust pellets can support sustainable energy provision in urban Zambia while reducing deforestation on the countryside. However, acceptability of pellet cookstoves remains low, while the demand for wood fuel is increasing. The study investigated the acceptability of pellet cookstoves, in view of governmental policies, in the Matero-George compound, Lusaka. Qualitative approaches were applied, and respondents were households, and officers at the Departments of Energy and Forestry, and at Lusaka City Council. Factors shaping the stoves’ acceptability included their convenience, possibility of reusing pellets, their long-term cost advantages, and the perceived health benefits of pellets. The barriers included limited supply of pellets, combustible pellet cookstoves, stove size, maintenance costs, cooking traditions, and government policies for dissemination, sensitisation, and communication about pellet stoves. This study demonstrated that implementation of pellet cookstoves at the local level depends on a multitude of contextual factors, and confirms the need for relevant policy instruments if such energy consumption is to be accepted.
{"title":"Assessing the awareness and adoptability of pellet cookstoves for low-income households in Lusaka, Zambia","authors":"M. Mulenga, A. Roos","doi":"10.17159/2413-3051/2021/v32i3a11463","DOIUrl":"https://doi.org/10.17159/2413-3051/2021/v32i3a11463","url":null,"abstract":"Wood fuel, charcoal, and firewood comprise over 70 percent of the national energy consumption in Zambia, as only about 25 percent of the population has access to electricity. Replacing charcoal braziers with cookstoves using sawdust pellets can support sustainable energy provision in urban Zambia while reducing deforestation on the countryside. However, acceptability of pellet cookstoves remains low, while the demand for wood fuel is increasing. The study investigated the acceptability of pellet cookstoves, in view of governmental policies, in the Matero-George compound, Lusaka. Qualitative approaches were applied, and respondents were households, and officers at the Departments of Energy and Forestry, and at Lusaka City Council. Factors shaping the stoves’ acceptability included their convenience, possibility of reusing pellets, their long-term cost advantages, and the perceived health benefits of pellets. The barriers included limited supply of pellets, combustible pellet cookstoves, stove size, maintenance costs, cooking traditions, and government policies for dissemination, sensitisation, and communication about pellet stoves. This study demonstrated that implementation of pellet cookstoves at the local level depends on a multitude of contextual factors, and confirms the need for relevant policy instruments if such energy consumption is to be accepted.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76209445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-12-03DOI: 10.17159/2413-3051/2020/v31i4a8362
Lizzie Caperon, Lina I. Brand-Correa
This study explores the under-researched link between clean energy and public health outcomes, and offers new insights into the link between wider access to clean energy and progress towards health outcomes, in particular the prevention and treatment of non-communicable diseases such as diabetes. This is the first study to consider the impact of a run-of-river hydropower plant (RORHP) in a remote rural community in Zambia in relation to health outcomes. Exploring this relationship establishes how the health benefits which renewable energy can bring can be capitalised upon to meet the health-related objectives of the United Nations sustainable development goals. Workshops and semi-structured interviews were conducted with a range of stakeholders including community members, health workers, business owners, and key people involved with the plant, to establish health and social impacts of the introduction of electricity in the community of Ikelenge. Findings are used to establish both synergies and trade-offs of the RORHP on the health of the community, and recommendations are made for the continued improvement of health following the introduction of the RORHP, to achieve further progress towards meeting SDG targets.
{"title":"Sustainable electricity for sustainable health? A case study in North-western Zambia","authors":"Lizzie Caperon, Lina I. Brand-Correa","doi":"10.17159/2413-3051/2020/v31i4a8362","DOIUrl":"https://doi.org/10.17159/2413-3051/2020/v31i4a8362","url":null,"abstract":"This study explores the under-researched link between clean energy and public health outcomes, and offers new insights into the link between wider access to clean energy and progress towards health outcomes, in particular the prevention and treatment of non-communicable diseases such as diabetes. This is the first study to consider the impact of a run-of-river hydropower plant (RORHP) in a remote rural community in Zambia in relation to health outcomes. Exploring this relationship establishes how the health benefits which renewable energy can bring can be capitalised upon to meet the health-related objectives of the United Nations sustainable development goals. Workshops and semi-structured interviews were conducted with a range of stakeholders including community members, health workers, business owners, and key people involved with the plant, to establish health and social impacts of the introduction of electricity in the community of Ikelenge. Findings are used to establish both synergies and trade-offs of the RORHP on the health of the community, and recommendations are made for the continued improvement of health following the introduction of the RORHP, to achieve further progress towards meeting SDG targets.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"63 1","pages":"72-82"},"PeriodicalIF":0.0,"publicationDate":"2020-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91356864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-30DOI: 10.17159/2413-3051/2020/v31i4a8674
W. Hamer, E. Mathews, A. Gous, J. Booysen, J. Vosloo
The South African energy crisis harms the economy. Tax incentives are intended to help, but rules for incentives must be understood by all stakeholders for taxpayers to be encouraged to invest. Section 12L (S12L) is relatively new legislation that allows a tax deduction for verified year-on-year energy efficiency savings in South Africa. Concurrent benefits are excluded from this tax incentive, to prevent a double reward for the same activity. Although the prevention of double benefits is commonly addressed in the field of measurement and verification (M&V), non-technical guidelines are not available. This is a critical shortcoming since multiple professions (tax, audit and legal) need to understand the technical M&V requirements of S12L. This study reviews the current legislation and interpretations of concurrent benefits in terms of S12L. It shows that multiple energy-related incentives are utilised by industries and that, therefore, it must be determined if different programmes overlap, so as to create concurrent benefits with S12L. It is then critical to correctly apply M&V practice to ensure exclusion of concurrent benefits. This study also provides a simplified methodology to evaluate concurrency, based on the S12L regulatory requirements and standard M&V methods. Three case studies show how concurrency can occur and how M&V practice is applied to exclude double benefits. The test for concurrency is shown to reduce to the following question: Is the same energy saving funded twice? The tests must be done to ensure no double benefit occurs.
{"title":"Testing concurrent benefits for Section 12L tax incentives in South Africa","authors":"W. Hamer, E. Mathews, A. Gous, J. Booysen, J. Vosloo","doi":"10.17159/2413-3051/2020/v31i4a8674","DOIUrl":"https://doi.org/10.17159/2413-3051/2020/v31i4a8674","url":null,"abstract":"The South African energy crisis harms the economy. Tax incentives are intended to help, but rules for incentives must be understood by all stakeholders for taxpayers to be encouraged to invest. Section 12L (S12L) is relatively new legislation that allows a tax deduction for verified year-on-year energy efficiency savings in South Africa. Concurrent benefits are excluded from this tax incentive, to prevent a double reward for the same activity. Although the prevention of double benefits is commonly addressed in the field of measurement and verification (M&V), non-technical guidelines are not available. This is a critical shortcoming since multiple professions (tax, audit and legal) need to understand the technical M&V requirements of S12L. This study reviews the current legislation and interpretations of concurrent benefits in terms of S12L. It shows that multiple energy-related incentives are utilised by industries and that, therefore, it must be determined if different programmes overlap, so as to create concurrent benefits with S12L. It is then critical to correctly apply M&V practice to ensure exclusion of concurrent benefits. This study also provides a simplified methodology to evaluate concurrency, based on the S12L regulatory requirements and standard M&V methods. Three case studies show how concurrency can occur and how M&V practice is applied to exclude double benefits. The test for concurrency is shown to reduce to the following question: Is the same energy saving funded twice? The tests must be done to ensure no double benefit occurs.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"4 1","pages":"57-71"},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86061418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-11-30DOI: 10.17159/2413-3051/2020/v31i4a8808
Russel Mhundwa, M. Simon, J. Yongoua
This study presents an analysis of a 75 kWp grid-tied solar photovoltaic (PV) system with a grid tie limiter to provide energy requirements for an aquaculture centre in the Eastern Cape province of South Africa. A data acquisition system, comprising power and energy consumption meters, was deployed to measure solar PV generation, demand for the facility, and energy drawn from the utility grid. Statistical analysis was conducted on the data to determine the impact of the solar PV plant in reducing demand from the utility grid throughout the day, and this was extrapolated into monthly and annual contributions by the PV system to meeting the energy requirements. Findings reveal that the annual energy yield for the system was 1 864.29 kWh/kWp. The solar contribution to the total load requirement on a 24 hour cycle was 28% (139.82 MWh) from July 2018 to June 2019. Summer and winter average contributions by the PV system were 62% and 57% respectively for the period of 05:30–18:30. The mean monthly solar fraction for operating the farm between sunrise and sunset was 0.44. Furthermore, a total of 141.07 tCO2 has been avoided due to the operation of the PV system.
{"title":"The electrical energy impact of small-scale onsite generation: A case study of a 75 kWp grid-tied PV system","authors":"Russel Mhundwa, M. Simon, J. Yongoua","doi":"10.17159/2413-3051/2020/v31i4a8808","DOIUrl":"https://doi.org/10.17159/2413-3051/2020/v31i4a8808","url":null,"abstract":"This study presents an analysis of a 75 kWp grid-tied solar photovoltaic (PV) system with a grid tie limiter to provide energy requirements for an aquaculture centre in the Eastern Cape province of South Africa. A data acquisition system, comprising power and energy consumption meters, was deployed to measure solar PV generation, demand for the facility, and energy drawn from the utility grid. Statistical analysis was conducted on the data to determine the impact of the solar PV plant in reducing demand from the utility grid throughout the day, and this was extrapolated into monthly and annual contributions by the PV system to meeting the energy requirements. Findings reveal that the annual energy yield for the system was 1 864.29 kWh/kWp. The solar contribution to the total load requirement on a 24 hour cycle was 28% (139.82 MWh) from July 2018 to June 2019. Summer and winter average contributions by the PV system were 62% and 57% respectively for the period of 05:30–18:30. The mean monthly solar fraction for operating the farm between sunrise and sunset was 0.44. Furthermore, a total of 141.07 tCO2 has been avoided due to the operation of the PV system.","PeriodicalId":15666,"journal":{"name":"Journal of Energy in Southern Africa","volume":"89 1","pages":"1-15"},"PeriodicalIF":0.0,"publicationDate":"2020-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79932702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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