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A Simulation Study on the Energy Efficiency of Gas-Burned Boilers in Heating Systems
Issue:
Volume 4, Issue 6, December 2015
Pages:
327-332
Received:
4 December 2015
Published:
5 December 2015
Abstract: The energy efficiency of gas-burned boilers in space heating systems is sensitive to how the boiler is controlled. This study is aimed to investigate how the overall energy performance of a heating system can be optimized using best boiler control scheme. This is to be achieved through experimental studies and simulation studies. This paper presents the latter. A simplified boiler is proposed and integrated in a heating system modeling platform for the simulation study. The results show that the boiler in a heating system should be controlled according to the heating load in order to achieve the highest long-term energy efficiency while maintaining desired comfort.
Abstract: The energy efficiency of gas-burned boilers in space heating systems is sensitive to how the boiler is controlled. This study is aimed to investigate how the overall energy performance of a heating system can be optimized using best boiler control scheme. This is to be achieved through experimental studies and simulation studies. This paper present...
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Renewable Energy Policies and Practice in Tanzania: Their Contribution to Tanzania Economy and Poverty Alleviation
Halidini Sarakikya,
Iddi Ibrahim,
Jeremiah Kiplagat
Issue:
Volume 4, Issue 6, December 2015
Pages:
333-341
Received:
5 November 2015
Accepted:
18 November 2015
Published:
7 December 2015
Abstract: Tanzania is facing challenges in energy provision with a lot of people leaving in rural areas experiencing energy poverty exhibited by lack of access to electricity, therefore relying on traditional fuels for cooking and lighting. In Tanzania, the electricity access has risen from 18.4% in 2013 to 24% in 2015. Power generation remained generally stable in 2013 which contributed 7.3% to the growth of the National economy. In 2014 the estimates shows that the National economy grew by 7.2%, and is projected to reach 7.4% in 2015. It is reported that, the electricity demand in Tanzania is about 7% per year over the past 10 years. A large proportion of majority of rural population is located far away from the National grid and it is un economical to connect to the grid. The main objective of this paper is to examine renewable energy policies and practices in Tanzania and their contribution to Tanzania economy and poverty alleviation. The study focused on content analysis of projects reports and policy in 10 years. Tanzania has drafted renewable energy policies so as to shift dependence from hydropower which is many times affected by draught and weather patterns and petroleum that have been affected by price fluctuation to solar, wind, biogas and other biomass which are renewable. However, the adoption rate of these renewable energy technologies is low because of financial constraints, lack of awareness, lack of coordination between the Government, non Governmental organizations and private sectors. Existing renewable energy policies should be harmonized and the current practice should be evaluated so as to upgrade the adoption rate of renewable technologies.
Abstract: Tanzania is facing challenges in energy provision with a lot of people leaving in rural areas experiencing energy poverty exhibited by lack of access to electricity, therefore relying on traditional fuels for cooking and lighting. In Tanzania, the electricity access has risen from 18.4% in 2013 to 24% in 2015. Power generation remained generally st...
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Energy Potential of Waste Derived from Some Food Crop Products in the Northern Part of Cameroon
Samomssa Inna,
Jiokap Nono Yvette,
Kamga Richard
Issue:
Volume 4, Issue 6, December 2015
Pages:
342-352
Received:
12 November 2015
Accepted:
24 November 2015
Published:
7 December 2015
Abstract: The purpose of this study was to quantify the agricultural crop productions in each division of the northern regions of Cameroon, to evaluate the proportion of waste derived from these and to classify them according to their potential as energy sources. To achieve these goals, statistical data from Cameroon’s Ministry of Agriculture as well as standard methods of proximate analysis have been used to evaluate the proportion of each waste and its physico-chemical properties. The study reveals that agricultural activities generate an important quantity of waste (corn cobs and stalks, millet/sorghum stalks, rice hulls, cassava peelings, groundnut hulls, sweet potato peelings, Irish potato peelings and cotton hulls) of about 555 002.27 dry-bone tons per annum in the three northern regions of Cameroon. The highest waste production is found in the North region with 42.93% of the total waste, directly followed by the Far North region with 42.44%. Of the three regions, the Adamawa presents the smallest percentage (11.23%). The main agro-industrial waste of these regions includes cotton hulls, with 3.41% of the total waste. The anhydrous low heating values of the wastes derived from the selected food crop products vary between 13.51 and 29.97 MJ/(kg d-b), indicating a total biomass-energy potential in the northern part of Cameroon of 11.5 TJ per year.
Abstract: The purpose of this study was to quantify the agricultural crop productions in each division of the northern regions of Cameroon, to evaluate the proportion of waste derived from these and to classify them according to their potential as energy sources. To achieve these goals, statistical data from Cameroon’s Ministry of Agriculture as well as stan...
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Data Analysis on the Advantages of the LEDS with Polarization-Matched Quantum
Issue:
Volume 4, Issue 6, December 2015
Pages:
353-357
Received:
11 December 2015
Published:
11 December 2015
Abstract: Advantages of near-ultraviolet light-emitting diodes with polarization-matched InGaN/AlGaInN multi-quantum wells (QWs) are investigated numerically. Simulation results show that, the polarization-matched structure possesses improved efficiency droop and higher output power under high current injection due to better overlap of electron-hole wave functions and slighter Auger recombination. The optical performance of the polarization-matched structure can benefit from the enhanced capability of carrier confinement with the employment of larger bandgap electron-blocking layer and wider QWs.
Abstract: Advantages of near-ultraviolet light-emitting diodes with polarization-matched InGaN/AlGaInN multi-quantum wells (QWs) are investigated numerically. Simulation results show that, the polarization-matched structure possesses improved efficiency droop and higher output power under high current injection due to better overlap of electron-hole wave fun...
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Research Status of Carbon Anode and Its Modification for Microbial Fuel Cell
Issue:
Volume 4, Issue 6, December 2015
Pages:
358-361
Received:
24 December 2015
Published:
30 December 2015
Abstract: Anode material and its structure have important influence on the performance of microbial fuel cell. This paper reviews the development of carbon anode of microbial fuel cell briefly, describes the general trend of its improved method, and the research status of the anode modification of microbial fuel cell is introduced from two aspects, which are body modification of anode material and anode modification with external modifying group.
Abstract: Anode material and its structure have important influence on the performance of microbial fuel cell. This paper reviews the development of carbon anode of microbial fuel cell briefly, describes the general trend of its improved method, and the research status of the anode modification of microbial fuel cell is introduced from two aspects, which are...
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