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Articles by M.M. Hasan
Total Records ( 4 ) for M.M. Hasan
  R. Saidur , M. Hasanuzzaman , M.M. Hasan and H.H. Masjuki
  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.
  M.M. Hasan , A.S.M.A. Haseeb , R. Saidur , H.H. Masjuki and M. Hamdi
  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.
  R. Saidur , M.M. Hasan , A.S.M.A. Haseeb and H.H. Masjuki
  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.
  M.R. Rahman , M.A. Shariff , M.O. Rahman , M.S. Uddin , A.K.M. Shafiq Ullah , M.A. Shameem , M.M. Hasan , S.J. Hasan and M.A. Huq
  Essential and trace elementals in some fruits and vegetables of southwestern Bangladesh have been measured using particle induced X-ray emission (PIXE) technique. The selected fruits and vegetables for study are usually consumed by all income groups of rural and city population. The samples were dried, pressed to make pellet and then bombarded with accelerated protons at 3.0 MV Tandem Accelerator facility of Bangladesh Atomic Energy Commission. The X-rays emitted in the irradiation were measured by HPGe-detector. The X-ray spectrum was analyzed using GUPIX software. A number of major and trace elements were found to be in varying concentrations in the investigated fruits and vegetables. The contents of K and Ca being notably large in some samples. No toxic elements were detected in the investigated samples.
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