The Experts below are selected from a list of 102 Experts worldwide ranked by ideXlab platform

Addisu Worku Bezabih - One of the best experts on this subject based on the ideXlab platform.

  • Evaluation of Small hydropower Plant at Ribb irrigation dam in Amhara regional state, Ethiopia
    Environmental Systems Research, 2021
    Co-Authors: Addisu Worku Bezabih
    Abstract:

    Background Energy is the main requirement for economic growth in any country and supports the modern economy. The energy sector is considered a vital element in developing countries because it meets energy needs. This article addresses the production of electricity using Small Hydroelectric power Plants for rural applications. The main objective of this study was to assess the potential of the Ribb dam for Small Hydroelectric Plants. The flow is very important for the production of Hydroelectricity as the height of a proposed site is constant and the available flow is very variable. Result The flow duration curve is constant and it will vary from 20 to 50% from the nominal flow. Further, it will decrease when the percentage of the nominal flow increases. The best size of a Small Hydroelectric Plant producing a maximum of electricity in the context of future projected flows in the study region. Further, the Ribb dam concluded that the average flow of 14.6331 m^3/s, the smooth head of 70.37 m, and the average nominal power of 5.53 MW. Conclusion Small hydro system (SHP) is a promising alternative for the production of cheap and renewable energy in rural or developing areas.

  • Evaluation of Small Hydropower Plant at Ribb Irrigation Dam in Amhara Regional State, Ethiopia
    2020
    Co-Authors: Addisu Worku Bezabih
    Abstract:

    Abstract Background: Energy is the main requirement for economic growth in any country and also supports the modern economy. The energy sector is considered a vital element in developing countries because it meets energy needs. This article deals with the production of electricity using Small Hydroelectric power Plants for rural applications. The main objective of this study was to assess the potential of the Ribb dam for Small Hydroelectric Plants. Since the height of a proposed site is constant while the available flow is very variable, the flow is very important for the production of Hydroelectricity. Result: The flow duration curve is constant from 20% to 50% of the nominal flow, and then decreases as the percentage of the nominal flow increases. The Ribb dam concluded that the average flow of 14.6331m3/s, the smooth head of 70.37 m, and the average nominal power of 5.53 MW would be the most optimal size of a Small Hydroelectric Plant producing a maximum of electricity in the context of future projected flows in the study region. Conclusion: SHP is a promising alternative for the production of cheap and renewable energy in rural or developing areas.

  • Evaluation of Small Hydropower Plant at Ribb Irrigation Dam in Amhara regional state, Ethiopia
    2020
    Co-Authors: Addisu Worku Bezabih
    Abstract:

    Energy is the main requirement for economic growth in any country and also supports the modern economy. The energy sector is considered a vital element in developing countries because it meets energy needs. This article deals with the production of electricity using Small Hydroelectric power Plants for rural applications. The main objective of this study was to assess the potential of the Ribb dam for Small Hydroelectric Plants. Since the height of a proposed site is constant while the available flow is very variable, the flow is very important for the production of Hydroelectricity. The flow duration curve is constant from 20% to 50% of the nominal flow, and then decreases as the percentage of the nominal flow increases. The Ribb dam concluded that the average flow of 14.6331m3/s, the smooth head of 70.37 m, and the average nominal power of 5.53 MW would be the most optimal size of a Small Hydroelectric Plant producing a maximum of electricity in the context of future projected flows in the study region. SHP is a promising alternative for the production of cheap and renewable energy in rural or developing areas.

Urszula Szymanska - One of the best experts on this subject based on the ideXlab platform.

  • gastropods and periphytic algae relationships in the vicinity of a Small Hydroelectric Plant on the pas eka river in northeast poland
    Archives of Polish Fisheries, 2014
    Co-Authors: Elzbieta Zebek, Urszula Szymanska
    Abstract:

    This study of periphytic algae and gastropods differentiation on macrophytes, stones, and dam substrates and the relationships between these communities in the vegetative season of 2001-2003 was conducted in the vicinity of a Hydroelectric Plant on the Pas³eka River. Damming the river caused decreased water discharge upstream from the Plant, and increased it downstream. Thus, oxygen conditions downstream from the Plant improved, but high nutrient concentrations were also recorded. Generally, increased orthophosphate concentrations do not allow river waters to be classified as having good or maximum ecological potential. Damming contributed to changes in the growth conditions of the periphytic algae and gastropods and their differentiation. The highest biomass of periphytic algae was noted on the dam, while the highest gastropods biomass was noted on macrophytes. The periphytic algae was dominated by the diatoms Diatoma vulgaris and Melosira varians (epiphyton, dam) and the chlorophytes Ulothrix tenuissima and Spirogyra sp. (epilithon), while the gastropods were dominated by Lymnea stagnalis (macrophytes), Theodoxus fluviatilis (stones), and Radix balthica (dam). The relationship between the gastropods and the periphytic algae on macrophytes and the dam in spring and summer revealed an increase in gastropods biomass and a decrease in periphytic algae biomass. This was indicated by the negative correlation between the biomass of these communities.

  • Gastropods and periphytic algae relationships in the vicinity of a Small Hydroelectric Plant on the Pas³êka River in northeast Poland
    Archives of Polish Fisheries, 2014
    Co-Authors: Elżbieta Zębek, Urszula Szymanska
    Abstract:

    This study of periphytic algae and gastropods differentiation on macrophytes, stones, and dam substrates and the relationships between these communities in the vegetative season of 2001-2003 was conducted in the vicinity of a Hydroelectric Plant on the Pas³eka River. Damming the river caused decreased water discharge upstream from the Plant, and increased it downstream. Thus, oxygen conditions downstream from the Plant improved, but high nutrient concentrations were also recorded. Generally, increased orthophosphate concentrations do not allow river waters to be classified as having good or maximum ecological potential. Damming contributed to changes in the growth conditions of the periphytic algae and gastropods and their differentiation. The highest biomass of periphytic algae was noted on the dam, while the highest gastropods biomass was noted on macrophytes. The periphytic algae was dominated by the diatoms Diatoma vulgaris and Melosira varians (epiphyton, dam) and the chlorophytes Ulothrix tenuissima and Spirogyra sp. (epilithon), while the gastropods were dominated by Lymnea stagnalis (macrophytes), Theodoxus fluviatilis (stones), and Radix balthica (dam). The relationship between the gastropods and the periphytic algae on macrophytes and the dam in spring and summer revealed an increase in gastropods biomass and a decrease in periphytic algae biomass. This was indicated by the negative correlation between the biomass of these communities.

Changbo Wang - One of the best experts on this subject based on the ideXlab platform.

  • Emergy analysis of a Small hydropower Plant in southwestern China
    Ecological Indicators, 2014
    Co-Authors: Lixiao Zhang, Mingyue Pang, Changbo Wang
    Abstract:

    Abstract Although its environmental performance and sustainability remain unclear, Small hydropower (SHP) has undergone rapid expansion in China. Through emergy analysis, this study aimed to assess the environmental impact and relative sustainability of a Small Hydroelectric Plant in Guizhou Province, which is located in southwestern China, in 2010. The analysis included a comparison with similar evaluations that were conducted for large Hydroelectric projects: two hydropower dams on the Mekong River in Thailand, one multipurpose dam in Korea, and the Three Gorges Dam in China. As indicated by the emergy yield ratio (EYR), environmental loading ratio (ELR), and emergy sustainability index (ESI), the overall environmental performance of the SHP system examined in this research surpassed the environmental performance of large dams. However, environmentally sensible designs do not automatically imply a promising future. The case-study SHP is on the verge of bankruptcy due to financial losses, which can be attributed to the current grid-connected cost of electricity of 0.23 CNY/kWh. The emergy exchange ratio (EER) quantitatively demonstrates that the fair price of electricity from the perspective of emergy balance is 0.4 CNY/kWh. The sensitivity analysis reveals that the inherent defect of unstable operation, which is exhibited by the SHP system, greatly affects the environmental performance of a SHP Plant.

Marcelo Azevedo Costa - One of the best experts on this subject based on the ideXlab platform.

  • Extended Isolation Forests for Fault Detection in Small Hydroelectric Plants
    Sustainability, 2020
    Co-Authors: Rodrigo Barbosa De Santis, Marcelo Azevedo Costa
    Abstract:

    Maintenance in Small Hydroelectric Plants is fundamental for guaranteeing the expansion of clean energy sources and supplying the energy estimated to be necessary for the coming years. Most fault diagnosis models for Hydroelectric generating units, proposed so far, are based on the distance between the normal operating profile and newly observed values. The extended isolation forest model is a model, based on binary trees, that has been gaining prominence in anomaly detection applications. However, no study so far has reported the application of the algorithm in the context of Hydroelectric power generation. We compared this model with the PCA and KICA-PCA models, using one-year operating data in a Small Hydroelectric Plant with time-series anomaly detection metrics. The algorithm showed satisfactory results with less variance than the others; therefore, it is a suitable candidate for online fault detection applications in the sector.

Elżbieta Zębek - One of the best experts on this subject based on the ideXlab platform.

  • Gastropods and periphytic algae relationships in the vicinity of a Small Hydroelectric Plant on the Pas³êka River in northeast Poland
    Archives of Polish Fisheries, 2014
    Co-Authors: Elżbieta Zębek, Urszula Szymanska
    Abstract:

    This study of periphytic algae and gastropods differentiation on macrophytes, stones, and dam substrates and the relationships between these communities in the vegetative season of 2001-2003 was conducted in the vicinity of a Hydroelectric Plant on the Pas³eka River. Damming the river caused decreased water discharge upstream from the Plant, and increased it downstream. Thus, oxygen conditions downstream from the Plant improved, but high nutrient concentrations were also recorded. Generally, increased orthophosphate concentrations do not allow river waters to be classified as having good or maximum ecological potential. Damming contributed to changes in the growth conditions of the periphytic algae and gastropods and their differentiation. The highest biomass of periphytic algae was noted on the dam, while the highest gastropods biomass was noted on macrophytes. The periphytic algae was dominated by the diatoms Diatoma vulgaris and Melosira varians (epiphyton, dam) and the chlorophytes Ulothrix tenuissima and Spirogyra sp. (epilithon), while the gastropods were dominated by Lymnea stagnalis (macrophytes), Theodoxus fluviatilis (stones), and Radix balthica (dam). The relationship between the gastropods and the periphytic algae on macrophytes and the dam in spring and summer revealed an increase in gastropods biomass and a decrease in periphytic algae biomass. This was indicated by the negative correlation between the biomass of these communities.