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International Journal of Renewable Energy Development
Published by Universitas Diponegoro
ISSN : 22524940     EISSN : 27164519     DOI : https://doi.org/10.14710/ijred
Core Subject : Science,
Chemistry Energy
The scope of journal encompasses: Photovoltaic technology, Solar thermal applications, Biomass, Wind energy technology, Material science and technology, Low energy Architecture, Geothermal energy, Wave and Tidal energy, Hydro power, Hydrogen Production Technology, Energy Policy, Socio-economic on energy, Energy efficiency and management The journal was first introduced in February 2012 and regularly published online three times a year (February, July, October).
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 6 Documents
 1 
Search results for , issue "Accepted Articles" : 6 Documents clear
Copper and lead ions removal by electrocoagulation: process performance and implications for energy consumption prasetyaningrum, aji prasetyaningrum
International Journal of Renewable Energy Development Accepted Articles
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.0.31665

Abstract

Electroplating wastewater contained a high amount of heavy metals that can cause serious problems to humans and the environment. The aim of this research to examine the electrocoagulation (EC) effect of removing copper and lead ions from wastewater using aluminum electrodes. It also analyzes the removal efficiency and energy consumption rate of the effects in heavy metals removal from wastewaters, via electrocoagulation method. The operational parameters were the electrocoagulation time (20–40) min, current density (40–80) A/m2, pH (3-11), and initial concentration of heavy metals. The concentration of metals ions and sludges morphology was analyzed using AAS and SEM, respectively. The percentage of lead and cooper ions decrease with increasing EC time. The current density was an important parameter. The use of high current density has an effect on increasing energy consumption. Furthermore, the performance of the electrocoagulation process was decreased at low pH. The higher initial concentration of heavy metals results in higher removal efficiency than lower concentration. The removal percentage of copper and lead ions was 89.88% and 98.76%, respectively at 40 minutes with electrocoagulation treatment of 80 A/m2 current density and pH 9. For this condition, the specific amount of dissolved electrodes was 0.2201 kg/m3 with energy consumption of 21.6 kWh/m3. The kinetic study showed ion removal following the pseudo-first-order model. The sludges produced by the electrocoagulation process contain economic compounds and have potential as new material.
Feasibility of marine renewable energies in African coastal countries Lam, Wei Haur; Oppong, Stephen
International Journal of Renewable Energy Development Accepted Articles
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.0.34075

Abstract

Africa has 38 coastal countries with a population of 895,609,564 persons with potential to harness energy from ocean. These coastal countries are: Madagascar, South Africa, Mozambique, Angola, Namibia, Mauritius, Republic of Congo and Democratic Republic of Congo in Southern Africa with 25.31% population; Somalia, Eritrea, Tanzania, Sudan, Kenya, Seychelles, Comoros and Djibouti in Eastern Africa with 17.58% population; Egypt, Morocco, Libya, Tunisia and Algeria in Northern Africa with 20.96% population; Cape Verde, Gabon, Nigeria, Mauritania, Liberia, Ghana, Senegal, Cote d’Ivoire, Cameroon, Sierra Leone, Guinea Bissau, Guinea, Equatorial Guinea, Sao Tome and Principe, Benin, Gambia and Togo with population of 35.15%. Offshore wind, offshore solar, Tidal power, Wave energy, Salinity gradient, Ocean Thermal Energy Conversion (OTEC) are discussed with opportunities and challenges.
Prototype of solar collector with recirculation of nanofluids, for a convective dryer Vania Sbeyde Farias-Cervantes; Denis Del Sagrario Garcia-Marquez; Isaac Andrade-Gonzalez; Arturo-Moises Chavez-Rodriguez; Mayra I Montero-Cortes
International Journal of Renewable Energy Development 2022: Accepted Articles
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2022.44221

Abstract

The research is based on the design, construction, and evaluation of a flat-layer solar collector using nanofluids. It has the following dimensions 1 m2 by 20 cm in height, a 9 mm thick tempered glass, a heat exchanger, where nanofluids circulate, and an angle of inclination of 45 °. Nanofluids were designed based on canola oil and nanopowders of size> 50 nm of Al2O3, CuO, and a 1: 1 mixture of both; Its thermal profile was determined using the Differential Scanning Calorimetry (DSC) technique. The temperatures of the solar collector were recorded in an Agricos® unit. As a result, the maximum peaks of the air leaving the collector were as follows. 39.1 ° C, 44 ° C, 54 ° C and 47.1 ° C, for canola oil, nanofluids Al2O3, CuO, and the 1: 1 mixture respectively. it is observed that there is an increase in the outlet air temperature using nanofluids.
Numerical investigation of a new modified Savonius wind turbines Khalid Mrigua; mounia zemamou; mohammed Aggour
International Journal of Renewable Energy Development 2022: Accepted Articles
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2022.45799

Abstract

The performance of a Savonius wind turbine depends on its geometrical parameters. Various blade profiles have been developed in the past years to improve the performance of this class of turbine. In this paper, a new blade shapes of Savonius wind turbine is investigated numerically by using the CFD method. The new blade has different concave and convex shape, which is a combination of the conventional and the elliptical blade. A comparative study of three blade profiles, semi-circular, elliptical and the composed blades have been performed. Flow structures around the rotor have also been analyzed. The results show that the new modified and the elliptical blade exhibit higher performance compared to the conventional Savonius wind turbine. The new modified Savonius blade and the elliptical blade exhibit an improved performance compared to the conventional model in the order of 20.5% and 18.2% respectively at the tip speed ratio of 0.8.
Performance enhancement and emissions reduction in a diesel engine using oleander and croton biodiesel doped with graphene nanoparticles Treza Wambui Ng'ang'a; Meshack Hawi; Francis Njoka; joseph Ngugi Kamau
International Journal of Renewable Energy Development Accepted Articles
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2023.51785

Abstract

Petroleum diesel is non-renewable and a major contributor to environmental pollution and global warming. Biodiesel is a suitable substitute to diesel because it is renewable, environment-friendly and has a low carbon footprint. However, its high density, high viscosity and low heating value prevents it from replacing petroleum diesel completely. The current study seeks to establish the performance and emission characteristics of a compression ignition engine operating on Oleander and Croton biodiesel doped with graphene nanoparticles. Five fuel samples were used, including diesel (D100), diesel - 80% blended with Oleander and Croton biodiesel - 20% (OCB20) and OCB20 dosed with Graphene nanoparticles at mass fractions of 50 ppm (mg/L), 75 ppm (mg/L) and 100 ppm (mg/L), respectively. Engine tests revealed a significant improvement in brake thermal efficiency especially at 75 ppm concentration which was 2.76% % and 18.93% higher than diesel and OCB20, respectively and a reduction in brake specific fuel consumption by 2.44% and 16.67% compared to diesel and OCB20, respectively. Carbon monoxide (CO) and unburnt hydrocarbon emissions (UHC) decreased for the 50 ppm sample, recording 8.58% and 21.65% reduction in CO and 52.2% and 50% in UHC compared to the diesel and OCB20, respectively. However, NOx emissions increased. Graphene nanoparticle-enhanced biodiesel can therefore substitute petroleum diesel, albeit with NOx reduction techniques. Key words: Biodiesel; Compression ignition engine; Emission; Nano additives, Performance.  
Modeling Anaerobic Co-Digestion of Water Hyacinth with Ruminal Slaughterhouse Waste for First Order, modified Gompertz and Logistic Kinetic Models Erick Omondi Auma; Peter Kuria Ndiba; Gloria Chepkoech Koech; Arnold Aluda Kegode
International Journal of Renewable Energy Development Accepted Articles
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2023.52775

Abstract

The co-digestion of water hyacinth (WH) with ruminal slaughterhouse waste (RSW) has the potential to improve biogas production from WH and reduce its environmental challenges. However, efficient operation of the process requires an understanding of the relationship between the biogas production and the process parameters. Kinetic models can be useful tools for describing the biogas production process in batch reactors. While the first order kinetics models assume that the rate of biogas production is proportional to the concentration of the remaining substrates, other models such as the modified Gompertz and the Logistic models incorporate the lag phase, which is a key feature of the anaerobic digestion process. This study conducted batch co-digestion of WH with 0, 10, 20 and 30% RSW proportions at mesophilic temperature of 32ºC. Co-digestion of WH with 30% RSW proportion exhibited the most stable daily biogas production and the largest biogas yield in 50 days. The biomethanation data were fitted with the first order kinetics, modified Gompertz and the Logistic models. The biogas production for co-digestion of WH with 30% RSW was best described by the modified Gompertz model with a biogas yield potential, Mo, of 43.2 ml (gVS)-1d-1; maximum biogas production rate, Rm, of 1.50 ml (gVS)-1d-1; and duration of lag, λ, of 3.89 d.

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