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Search Results: 1 - 10 of 223671 matches for " R. Saidur "
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Energy savings and emission reductions in industrial boilers
Saidur R.
Thermal Science , 2011, DOI: 10.2298/tsci091014046s
Abstract: In this paper energy use of boiler fan motors has been estimated using energy audit data. Energy savings using VSD by modulating fan speed has been estimated as well. Bill savings and associated emission reductions using VSD have been estimated and presented in this paper. It has been found that 139,412 MWh, 268,866, 159,328 MWh, and 99,580 MWh electrical energy can be saved for 40%, 60%, 80% and 100% motor loadings, respectively for 60% speed reduction. Corresponding bill savings for the aforementioned energy savings have been found to be US$7,318,335, US$14,113,933, US$8,363,812, and US135,911,944 for 40%, 60%, 80% and 100% motor loadings, respectively for 60% speed reduction. Along with energy savings, 69,770,744 kg, 134,558,329 kg, 79,738,065 kg, 49,836,603 kg of CO2 emission can be avoided for the associated energy savings as a result of energy savings using VSD for 40%, 60%, 80% and 100% motor loadings. Moreover, 32,503,558 GJ of fossil fuel can be saved for the flue gas temperature reduction as a result of reducing fan motor speed reduction. Flue gas energy savings for oxegen trim system has been estimated and found to be 549,310,130 GJ for 16.9% of excess air reduction with payback period less than a day.
Application of Artificial Neural Networks to Investigate the Energy Performance of Household Refrigerator-Freezers
R. Saidur,H.H. Masjuki
Journal of Applied Sciences , 2008,
Abstract: In this study, the energy consumption of 149 domestic refrigerators has been monitored in Malaysian households. A questionnaire was used to get relevant information regarding the usage of this appliance in the actual kitchen environment to feed into neural networks. Prediction performance of Artificial Neural Networks (ANN) approach was investigated using actual monitored and survey data. Statistical analyses in terms of fraction of variance R2, Coefficient of Variation (COV), RMS are calculated to judge the performance of NN model. It has been found that the regression coefficient R2 is very close to unity for the best prediction performance results.
Investigation of Energy Consumption and Energy Savings of Refrigerator-Freezer During Open and Closed Door Condition
M. Hasanuzzaman,R. Saidur,H.H. Masjuki
Journal of Applied Sciences , 2008,
Abstract: This study presents the effects of different operating variables on energy consumption of refrigerator-freezer that had two phases. The first phase is to investigate the effects of the number of door opening, duration of each door remain open, ambient temperature, cabinet load and thermostat setting position on energy consumption during the open door conditions. The second phase is to investigate the effects of the ambient temperature, cabinet load, thermostat setting position and open surface water pan area inside the cabinet on energy consumption during the closed door conditions. All the experiments were conducted in the environmental controlled chamber. The result shows that there is a great influence of different variables on energy consumption and average consumption is about 3.3 kWh day-1. The effects of number of door opening, ambient temperature and cabinet load are more compared to the others. The open door energy consumption is 40% more compared to the closed door test. It is found that the average of the maximum energy consumption is 27.3% more compared to average consumption and 55.6% more compared to average of the minimum consumption. If the users be serious, a significant amount of energy could be saved with the proper utilization of refrigerator-freezer.
Investigation of Energy Performance and Usage Behavior of Domestic Refrigerator Freezer Using Clustering and Segmentation
R. Saidur,H.H. Masjuki,M. Hasanuzzaman,G.S. Kai
Journal of Applied Sciences , 2008,
Abstract: This study carried out the field survey from house to house to garner the information of consumer behavior. In this study the energy consumption 104 refrigerators have been monitored as well. The energy consumption of 104 refrigerators is clustered and segmented to classify the refrigerators of same characteristic in the same group. The capacity of the refrigerator, frequency of door opening and position of refrigerator either near heat source or away from the heat source is considered for clustering and segmentation analysis. The clustering and segmentation in this survey reveal the effect of these factors on the energy performance of the refrigerator.
Analysis of Exhaust Emissions of Natural Gas Engine by Using Response Surface Methodology
R. Saidur,M.I. Jahirul,M. Hasanuzzaman,H.H. Masjuki
Journal of Applied Sciences , 2008,
Abstract: Experiments were conducted to investigate the engine`s emission at the different operating conditions. The tests were conducted by varying the engine speed, throttle opening and operating time. During the experimental investigation, the operating variables were varied (engine speed from 1500 to 2500 rpm; throttle percentage from 25 to 36% and operating time from 2.5 to 5 min) according to the experimental schedule set up. These emission models reveal the effects of each parameter`s significance and adequacy for the design range which evaluated using ANOVA F-test. The effects of each parameter in emission response are studied through the response model. From the comparative evaluation of the experimental results for the different operating conditions, it is revealed that there is an influence of the engine speed, throttle position and operating time. From the analysis, it is concluded that emissions are more affected on engine speed and throttle position.
Overall Thermal Transfer Value of Residential Buildings in Malaysia
R. Saidur,M. Hasanuzzaman,M.M. Hasan,H.H. Masjuki
Journal of Applied Sciences , 2009,
Abstract: This study presents the Overall Thermal Transfer Value (OTTV) and the energy consumption of room air conditioners of the residential buildings in Malaysia. A survey has been conducted to investigate the OTTV and the energy consumption of room air conditioners of the residential buildings in Malaysia. OTTV calculation, energy consumption and effect of the building parameters on energy consumption have been investigated. It is found that OTTV of the residential buildings in Malaysia varied from 35 to 65 W m-2 with a mean value of 41.7 W m-2. The sensitivities of several parameters such as window to wall ratio (WWR), Shading Coefficient (SC), U-value for wall (Uw) and solar absorption (α) are provided to design and optimize the thermal performance of residential buildings. It is found that U and α influence more on OTTV compared to other parameters. The analysis shows that about 14, 10 and 5% of residential building air conditioners have annual electricity consumption in the ranges 500 to 1000 kWh, 1000 to 2000 kWh and 7500 to 10000 kWh, respectively. The maximum, minimum and average annual electricity consumption of the air conditioner of residential buildings is 22055.5, 136.1 and 3708.8 kWh, respectively.
Synthesis and Annealing of Nanostructured TiO2 Films by Radio-Frequency Magnetron Sputtering
M.M. Hasan,A.S.M.A. Haseeb,R. Saidur,H.H. Masjuki
Journal of Applied Sciences , 2009,
Abstract: In this investigation, anatase TiO2 thin films were deposited on glass substrates at room temperature by RF magnetron sputtering at an elevated sputtering pressure of 3 Pa. The TiO2 films deposited at room temperature were annealed at different temperatures up to 873°K for 1 h. The TiO2 films were characterized by X-Ray Diffraction (XRD), Field-Emission Scanning Electron Microscopy (FESEM), Atomic Force Microscopy (AFM) and UV-visible-NIR spectrophotometry. The XRD results reveal that the as-deposited film possess the anatase structure. Annealed TiO2 films show an insignificant change in crystallinity except of the fact that there is a slight increase for the film annealed at 600°C. The crystallite size increases from 44.5 to 48 nm with the increase of the annealing temperature. As-grown TiO2 film exhibits high visible transmittance with enhanced refractive index of 2.31 at a wavelength of 550 nm. The indirect optical band gaps of the as-deposited and annealed films have been estimated to be in the range of 3.39-3.42 eV. AFM observations reveal the compact and dense morphology of the as-deposited and annealed TiO2 thin films.
Energy-Efficient Optical Coating for Flat Glass
R. Saidur,M.M. Hasan,A.S.M.A. Haseeb,H.H. Masjuki
Journal of Applied Sciences , 2008,
Abstract: In this study, the recent trends for optical coatings in glass industries have been explored for the variety of climate dependent applications. Different coated glazings have been presented with their optical and thermal characteristics. A comparative analysis among types of coated products is also performed. It has been observed that for warm climate it is necessary to block near infra red portion of sunlight to reduce solar heat gain through windows. On the other hand, for cold climate it is necessary to allow the whole portion of light and it is necessary to block the IR radiation from escaping out to keep the interior space warm. For this purpose, Ag or Ag-alloy metallic thin film meet the requirements but they reduce visible transmittance as well. So for increasing visible transmittance, a dielectric layer of high refractive index is required. Here a variety of dielectric layers are studied. Finally for reaching the goal of low energy buildings in both warm and cold climates, appropriate optical coatings for architectural flat glass have been recommended.
Extraction Kinetics of Ni(II) in the Ni2+- SO42--Ac-(Na+, H+)-Cyanex 272 (H2A2)-Kerosene-3% (v/v) Octan-1-ol System Using Single Drop Technique  [PDF]
Ranjit Kumar Biswas, Aneek Krishna Karmakar, Muhammad Saidur Rahman
International Journal of Nonferrous Metallurgy (IJNM) , 2013, DOI: 10.4236/ijnm.2013.22011
Abstract:

The kinetics of extraction of Ni(II) in the Ni2+-SO4 2_AC- (Na+, H+)-Cyanex 272 (H2A2)-kerosene-3% (v/v) octan-1-ol system using the single falling drop technique have been reported. The flux of Ni2+ transfer (F) at 303 K in presence of 3% (v/v) octan-1-ol (de-emulsifier) can be represented as:\"\".Depending on reaction parameters, the activation energy (Ea) and enthalpy change in activation (DH±) varies within 17 - 58 kJ/mol and 17 -

Response to an Earthquake in Bangladesh: Experiences and Lesson Learnt  [PDF]
Animesh Biswas, Saidur Rahman Mashreky, Koustuv Dalal, Toity Deave
Open Journal of Earthquake Research (OJER) , 2016, DOI: 10.4236/ojer.2016.51001
Abstract: A powerful earthquake occurred in Nepal on 25th April 2015 where the highest measure of the tremor was 7.9 on the Richter scale with a minimum of 6.6. The death toll was around 3000 and thousands were injured in the devastation of the disaster. The earthquake and subsequent earth tremors were also felt in other South East Asian countries including Bangladesh, India and China. Bangladesh was jolted twice by tremors and, although the tremor was not as severe, it was reported to be between 4 and 5 on the Richter scale. Aftershocks over the next few days were also experienced and these ranged around 5 on the Richter scale. In Bangladesh, six lives were lost, and more than 200 people were injured and were taken to hospital. There were also many buildings that collapsed in the mega city Dhaka and its surrounding areas. This study describes the country’s response to the earthquake. This experience and the lessons learnt highlight the importance for national earthquake-proof building regulations and systems to lessen the damage and devastation of any future earthquake.
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