WorldCat Identities

Khan, Mohammad Masud Kamal

Overview
Works: 54 works in 55 publications in 1 language and 55 library holdings
Roles: Author
Publication Timeline
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Most widely held works by Mohammad Masud Kamal Khan
Modelling and analysis of air-cooled reciprocating chiller and demand energy savings using passive cooling by Ashfaque Ahmed Chowdhury( )

2 editions published in 2009 in English and held by 2 WorldCat member libraries worldwide

The study presents modelling and analysis of air-cooled chiller system in an office building at Central Queensland University in Rockhampton, Australia. EnergyPlus, building energy simulation software, has been used to model and to simulate the energy savings. Base case cooling energy has been compared with measured data. The simulated results show a reasonable agreement with the measured data. As a passive cooling means, the effect of economiser usages and pre-cooling have been simulated and analysed to assess annual demand savings for an energy intensive office building at Rockhampton, Australia. It was found that implementation of the pre-cooling and economiser system could save 115 kW/m2/month and 72 kW/m2/month total cooling energy and 26 kW/m2/month and 42 kW/m2/month chiller energy, respectively
Modeling of bubble flow distribution in crystal suspended non-Newtonian fluids by N. M. S Hassan( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

This paper investigates a computational study of air bubbles rising in massecuite equivalent non-Newtonian crystal suspensions. Bubble rise motion inside the stagnant liquid of 0.05% xanthan gum crystal suspension was investigated and modelled using computational fluid dynamics (CFD) model to gain an insight into the bubble flow distribution. CFD code FLUENT was used for numerical simulation and bubble rise characteristics were computed through a Volume of Fluid (VOF) model. The influences of the Reynolds number (Re) along with other dimensionless groups such the Weber number (We), and the Eötvös number (Eo) on bubble velocity and bubble trajectory are discussed. The effects of the vortices on bubble velocity distribution are analyzed. The simulated results of the bubble flow contours were validated by the experimental results. The model developed is capable of predicting the entire flow characteristics of different sizes of bubble inside the liquid column
Environmental and economic analysis for grid-connected hybrid photovoltaic-wind power system in a hot arid environment by Gang Liu( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

This paper deals with the environmental and economic benefits of hybrid renewable energy (HRE) system in a hot arid environment. This paper focuses on small-scale operations of 100kWh per day energy generation of HRE system as grid-assisted power generation in conjunction with solar (photovoltaic) and wind energy components. A comparison is drawn between a grid-connected HRE system operation and a standard grid operation in focusing on environmental and economic impacts. Emissions and the renewable energy generation fraction (RF) of total energy consumption are calculated as the main environmental indicator. Costs including net present cost (NPC) and cost of energy (COE) are calculated for economic evaluation. To simulate long-term continuous implementation of the HRE system, the hourly mean global solar radiation and wind speed data of 2007, from Alice Spring (23.70°S,133.88°E) of Australia, are used as an example of a typical hot arid climate. The HRE system is implemented at a monthly solar exposure between 13.31 and 21.3 (MJ/m^2)/day and mean wind speed of 7.0 ms. The Micropower Optimization Model software HOMER by the National Renewable Energy Laboratory is used. It is found, for Alice Springs arid climates, the optimum results of HRE system show a 64.4% reduction of emissions including CO_2, NO_x and SO_2. The optimum renewable fraction (RF) is 58%. It also has benefits of cost saving. The reduced COE is only equal to about 81.7% of energy consumption from standard grid. In addition, through a set of sensitivity analysis, it is also found that the wind speed has more effects on the environmental and economic performance of a HRE system under the specific climate
Building energy management : co-generation coupling with thermal energy storage by K. H Khan( )

1 edition published in 2002 in English and held by 1 WorldCat member library worldwide

This paper is concerned with the feasibility study and evaluation of an energy savings opportunity in buildings energy management using co-generation coupling with thermal energy storage. Both the technical and economical feasibility is presented first for the co-generation and then compared with the co-generation using thermal energy storage. On-site cogeneration with double effect absorption chiller provides a potential of at least 13% peak demand reduction and about 16% savings in energy consumption. It provides an internal rate of return (IRR) greater than 21% but saving potential is limited by the low demand of co-generated chilled water within the community of the institution. Thermal energy storage coupling with co-generation offers a simple and economically more attractive approach for maximizing the utilization of cogenerated chilled water and shows 23% reduction in peak demand and 21% savings in energy consumption. It provides higher IRR, greater than 25%
An evaluation of CO2 emission reduction through carbonation technology by Shadia Moazzem( )

1 edition published in 2011 in English and held by 1 WorldCat member library worldwide

Researchers around the world are studying on different carbon capture and storage (CCS) options to reduce global warming by reducing CO2 emission from various sources. Among all these options carbonation technology has some promising benefits over other technologies such as exothermic heat, availability of feed stocks, safe carbonated product and value added product and by-product, etc. In carbonation technology CO2 chemically reacts with Ca/Mg bearing oxides or hydroxides and transformed into an environmentally safe solid carbonate materials. This technology has attracted attention of several researchers around the world and scientists of Albany ResearchCentre, USA have been working on it for few years. Recently aproject has been established in Newcastle, Australia to set up acarbonation plant. Considering the potential benefits mentionedabove, the prospects of carbonation technology to reduce globalwarming by reducing CO2 emission have been reviewed, discussedand evaluated in this study
A numerical model of an electrostatic precipitator by Shah Haque( )

1 edition published in 2007 in English and held by 1 WorldCat member library worldwide

This paper presents a Computational Fluid Dynamics (CFD) model for a wire-plate electrostatic precipitator (ESP). The turbulent gas flow and the particle motion under electrostatic forces are modelled using the CFD code FLUENT. Numerical calculations for the gas flow are carried out by solving the Reynolds-averaged Navier-Stokes equations and turbulence is modelled using the k-Sf turbulence model. An additional source term is added to the gas flow equation to capture the effect of electric field. This additional source term is obtained by solving a coupled system of the electric field and charge transport equations. The particle phase is simulated by using Discrete Phase Model (DPM). The results of the simulation are presented showing the particle trajectory inside the ESP under the influence of both aerodynamic and electrostatic forces. The simulated results have been validated by the established data. The model developed is useful to gain insight into the particle collection phenomena that takes place inside an industrial ESP
Energy conservation measures in an institutional building by dynamic simulation using DesignBuilder by Mohammad Sajjadur Rahman( )

1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

In this study, various energy conservation measures (ECMs) on heating, ventilating and airconditioning (HVAC) and lighting systems for a 4-storied building in subtropical (hot and humid climate)Central Queensland, Australia are evaluated using the simulation software called DesignBuilder (DB) which isbased on EnergyPlus (EP) simulation engine. Energy consumption profiles of existing systems i.e. base casescenario are analysed and simulated first then, the simulated results are verified by on-site measured data usingHobo data logger and smart meters. ECMs, namely variable air volume (VAV) systems instead of constant airvolume (CAV), photo electric dimming control system instead of general lighting, and double glazed lowemittance window instead of single glazed window are evaluated. The effect of indoor environment on theseECMs is also discussed. It has been found that the building considered in this study can save up to 26.5%energy without compromising occupancies thermal comfort by implementing the above mentioned ECMs intothe existing system
An experimental investigation of bubble rise characteristics in a crystal suspended non-Newtonian fluid by N. M. S Hassan( )

1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

An experimental study of the bubble rise characteristics in non-Newtonian fluid with crystal suspension is presented in this paper. The suspension was made of different concentration of xanthan gum solutions with 0.2:1 mm polystyrene crystal particle. Different percentage of crystal content (by weight) INas used to vary rheological properties. The effect of crystal particles and bubble volumes on thc bubble rise velocity and bubble trajectory is analysed. The results show that the average bubble velocity increases with the increase in bubble volume for crystal suspended xanthan gum solution. In trajectory analysis, it is seen that the small bubbles expericnced less horizontal motion in crystal suspended xanthan gumsolution while larger bubbles followed a spiral motion. Experimentally determined data for the drag coefficient at high Reynolds number are compared with the results of other analytical and experimental studies availabe in the literature The reported experimental data of drag co-efficient increases in crystal suspended xanthan gum solution for corresponding bubble volume and was found to be consistent with published data
An Experimental study of the bubble rise velocity and trejectory in water under pressure and vacuum by N. M. S Hassan( )

1 edition published in 2006 in English and held by 1 WorldCat member library worldwide

Bubble rise through a liquid is an important phenomenon in the engineering practice. Bubbles are used in polymer, metallurgy, biotechnology and especially in process industries for improving the heat and mass transfer. An experimental investigation on the bubble rise velocity and trajectory in a stagnant water column under different pressure and vacuum is presented in this study. The experiments were conducted at water heights of 1 m, 1.2 m, 1.4 m and 1.6 m by introducing different bubble volumes (0.1 mL 15.0 mL) corresponding to each height. The bubble rise velocity and trajectory were measured using a combination of non-intrusive (high speed photographic) method and digital image processing. The parameters that significantly affect the rise of air bubble are identified. The effect of different water heights and bubble volumes on the bubble rise velocity and trajectory is analysed and the influence of two different sizes of tubes on the bubble velocity for various bubble volume is discussed
Performance analysis of a novel building material to achieve superior thermal comfort and energy efficiency in arid climate by Ashfaque Ahmed Chowdhury( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

Analysis of Building thermal performance is necessary to predict comfort of the occupants in buildings and to identify the energy efficiency of the buildings. This study aims to study the impact of a new construction technology, incorporating the building envelop and internal walls, and examine the thermal performance of a residential building using smart construction materials in arid climate. The new envelop is technologically and environmentally sustainable and primary consists of, polystyrene, reinforced concrete, polystyrene and plaster board from inside and render from outside. The internal walls are made of compressed rice/wheat straws and are completely recyclable, biodegradable, and free from any chemical bonding elements, fire resistant and sound proof. An analysis and prediction of thermal comfort and energy consumption using DesignBuilder based on state of the art building simulation software EnergyPlus, is carried out in a residential building located in arid climate region of Australia. Simulated results show that this novel envelop reduces heat gains in buildings by 1.64 kW/m2/month, increases the thermal comfort of building occupants and reduces the energy required by 140 kWh/m2/year to cool buildings
Thermal conductivity of polymer nanocomposites made with carbon nanofibers by Sushant Agarwal( )

1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

An internal mixer was used to prepare polycarbonate (PC)-based nanocomposites containing carbon fibers, carbon nanofibers (CNF), and mixtures of the two fillers. The influence of the filler volume fraction, the relative amounts of the two fillers, and the filler orientation relative to the direction of heat flow on the thermal conductivity was examined. Filler orientation was obtained by the extrusion of strands of the nanocomposite. The thermal conductivity was measured using a steady-state heat conduction technique. The CNF were fragile, and their aspect ratio could be decreased during processing. In general, the composite thermal conductivity increased with increasing filler content. Fiber alignment in the heat flux direction resulted in a significant increase in thermal conductivity. Mixing of nanofibers with microfibers resulted contacts between the microfibers. This, together with fiber alignment provided large increases in the thermal conductivity
Techno-economic study of thermal energy storage systems in tropical climate university building by Mohammad Sajjadur Rahman( )

1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

In the heating, ventilating and air conditioning (HVAC) industry, cool thermal energy storage (TES) is the most preferred demand side management (DSM) technology for shifting cooling electrical demand from peak hour to off-peak hour. In this study, the techno-economic feasibility of TES in subtropical Central Queensland University building is studied. Cooling load profiles of existing systems are simulated first using DesignBuilder (DB) simulation software which is based on EnergyPlus (EP) simulation engine, then verified by on-site measured data and then TES systems are analysed. Under the Australian electricity tariff rates, the results show that the full chilled storage can save up to 61.3% of the electricity cost required for cooling when compared with the conventional system
A sustainable production in sugar industries : study of an improved vacuum pan performance through numerical simulations by N. M. S Hassan( )

1 edition published in 2009 in English and held by 1 WorldCat member library worldwide

This paper presents at improving existing vacuum pan (large cylindrical vessels with vertical heating surfaces) operation through numerical simulations, in particular for the sugar industries, and at enhancing the competitiveness of Australian industries. Therefore, this study investigates a Computational Fluid Dynamics (CFD) model for a single air bubble rising in non-Newtonian polymeric and crystal suspension. The bubble rise characteristics through different stagnant liquids in a vertical cylindrical column are modelled using the CFD code Fluent. Air bubble rise dispersed into the continuous liquid phase has been considered and modelled for two different bubble sizes. Bubble trajectory and velocity distributions were captured through a surface-tracking technique i.e. Volume of Fluid (VOF) method by solving a single set of momentum equations and tracking the volume fraction of each fluid throughout the domain. The simulated results of the bubble flow contours were validated by the experimental results and literature data. The model developed is capable of predicting the entire flow characteristics of different sizes of bubble inside the liquid column. The simulated data is used in sugar industries to gain knowledge, optimise and develop improved vacuum pan design that can achieve more productive performance and result in improved steam economy. The possible modification of the vacuum pan design enhances the sugar industrys competitive edge in the global market place by reducing production cost and less green house gas emissions
Review on solar assisted air conditioning for hospitals isolation units by Ali Baniyounes( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

Hospitals and hospital special units for example operation theatres, isolation units, laboratories are not like any other commercial property as they are required to operate special HVAC systems. To build an effective HVAC system design to enhance the air quality in the healthcare facilities is a great challenge. Indoor air Quality (IAQ) is more critical in healthcare facilities due to the hazardous microbial and chemical agents present and the increased susceptibility of the patients and health care staff. In certain areas, air handling unit dampers are forced to be fully open to allow for 100% of air extraction and, hypo filters are used in conjunction with dampers to ensure the quality of air during twenty four working hours seven days a week. Using no recycled air means more energy, more money and more gas emissions. Solar air conditioning systems can be constructed in a way that eliminates the need for refrigerants such as, Chlorofluorocarbon (CFC) and hydrochlorofluorocarbons (HCFC). Solar cooling systems are a nice tool for the exploitation of solar energy. They have the advantage of using absolutely harmless working fluids such as water, or a salt solution. They are energy efficient and environmentally safe. They can be used either as stand-alone systems or with conventional AC, to improve the indoor air quality of all types of buildings. The main goal is to utilize zero emissions technologies in order to reduce energy consumption as well as the CO2 emissions
Buildings energy simulation using energy express : a case study on sub-tropical Central Queensland University (CQU) buildings by Mohammad Sajjadur Rahman( )

1 edition published in 2006 in Undetermined and held by 1 WorldCat member library worldwide

The strategies of buildings energy management can be developed through energy audit, analysis and simulation. Currently, different end-users of CQU buildings such as heating, ventilating and air conditioning (HVAC) units, electrical appliances, etc do not take full advantage of local sub-tropical climatic conditions. Therefore, climate-responsive strategies need to be implemented in order to take full advantage of the positive climate attribute of sub-tropical climate regarding efficient energy management and conservation measures. This study is conducted on a three-story library building of CQU. HVAC systems were selected for practical operational energy conservation measures (ECM) to take advantages of hot and humid subtropical climate. A baseline energy consumption profile of the building is simulated using building energy simulation software called Energy Express (EE). The simulated results are then validated with energy audit and on-site metered data. The means to utilize environmental conditions to improve building energy efficiency is investigated. Variable air volume (VAV) system as an energy conservation option is investigated and compared with existing constant air volume (CAV) system. This study found that about 12% energy savings could be achieved by replacing CAV system with VAV system as an option for energy retrofitting, and hence recommended to CQU management for consideration
Radiation prediction and comparision for engineering applications by Ying Wu( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

Many methods exist for calculating and predicting solar radiation. These can be divided into three board categories, (i) the observational or empirical methods which use air temperatures, rainfall and sunshine hours measured over a period of years or other which use the earth sun geometric relationships and the location on the earth to modify these observations; (ii) the linked or artificial intelligent (AI) methods improve observations methods by interlinking observations over a geographic area or to other weather parameters so that the predictions are based on several linked observations and topographic relationships for a more reliable forecast; and (iii) the dynamic or modelling approach is mostly used in meteorology or atmospheric sciences, which uses measured variables such as water vapour, and ozone thickness and models attenuation, scattering and absorption of solar radiation in the atmosphere over the earth. Calculation and/or prediction of the amount of solar energy a location receives are useful for many different engineering applications. For example, for agricultural applications it indicates growth rates, for infrastructure, transport and manufacturing applications it dictates material selection and frequency of maintenance, etc. This paper explores the above mentioned three methods with a view to their engineeringapplications contrasting the different accuracies to the varying needs of the renewable energy sector. Problematic issues such as computation cost, the availability of solar radiation and what dictates the quality of measurement for the solar energy sector are also discussed
Implementing renewable energy for HVAC systems in entertainment and exhibition centres by Ali Baniyounes( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

Entertainment and exhibition centers are unlike any other commercial property since they have a special energy needs. High heat and electricity loads are the main key elements to face by the design engineers. By implementing renewable energy for heating, ventilating and air conditioning (HVAC) in entertainment and exhibition centers, a significant amount of energy savings can be achieved and this will also contribute in reducing gas emission. All power plants generating the electricity today produce gases and waste that have a negative impact on the environment. During the summer the demand for electricity increases dramatically because of the extensive use of HVAC systems, this increases the peak electric load, causing major problems in the national electric supply system. Acknowledging that global warming is the number one environmental threat, because of gas emission, puts a serious pressure on mankind to reduce carbon dioxide (CO2) emission to the atmosphere. High fuel prices force decision makers to adopt and encourage renewable energy resources. Implementing renewable energy might be a way to reduce the demand for electricity. In addition, most renewable energy systems are being developed in ways that reduce the need for convention fuel. This study presents a thorough review on zero emissions technologies for the built environment. The specific attention is given for subtropical climate in Australia. Both technical and economic feasibility compared to only grid connected HVAC are also discussed. This study contributes to the understanding and process development for implementing solar assisted HVAC systems in buildings in subtropical climates
Towards energy efficient building assets : review on sub-tropical climate by Ashfaque Ahmed Chowdhury( )

1 edition published in 2006 in Undetermined and held by 1 WorldCat member library worldwide

The energy efficient building asset is the key to the buildings sustainability. To approach the concept of energy efficient building assets in a sub-tropical climate, building assets must adopt a number of innovative strategies to take advantage of subtropical climate. A framework for understanding the climate comfort building relationship was proposed (Olgyay, 1953). This understanding was adapted to the psychrometric chart and was further developed to produce 'building bioclimatic chart' (Givoni, 1969). Milne (1979) elaborated these further and developed boundaries for outdoor conditions in terms of temperature and humidity which could be made comfortable by various energy conservation and management techniques. The importance of energy efficiency improvement in building asset is elaborated. Appropriate energy efficient technologies for building systems particularly Heating, Ventilation and Air Conditioning systems (HVAC) for subtropical/ warm humid climates is presented. The effectiveness of climate-responsive building design and space-conditioning strategies within the building assets in sub-tropical Queensland, Australia is reviewed and discussed
Passive cooling control strategies for energy efficency in a subtropical climate air conditioned building by Ashfaque Ahmed Chowdhury( )

1 edition published in 2006 in English and held by 1 WorldCat member library worldwide

The effect of changing control strategies of mechanical ventilation and air conditioning (MVAC) systems is usually difficult to predict as MVAC processes are non-linear and characteristics of energy consumption change on a seasonal basis. This study investigates how energy consumption can be reduced by defining change in control strategies and tuning the control loops. DesignBuilder based on EnergyPlus, the newest energy simulation software, is used to evaluate the potential energy savings of different passive cooling control strategies. An energy performance baseline model is developed and the influences of demand shifting strategies are investigated progressively round the year. Pre-cooling and economiser control strategies are compared with the baseline energy model. The simulation results show that savings of up to 446MWh can be achieved by implementing pre-cooling control strategies and 123MWh by implementing economiser control strategies. Normalised performance indices are computed to reach a better understanding of each control strategy. The thermal comfort index shows that occupants comfort is not hampered, while the building is occupied, under all control strategies
Integration of project based investigation into an undergraduate fluid mechanics course for research and teaching excellence by Ashfaque Ahmed Chowdhury( )

1 edition published in 2009 in English and held by 1 WorldCat member library worldwide

The aim of the integration of project based investigation into an undergraduate fluid mechanics course is to involve students with real life engineering problems and to enhance the students technical knowledge and problem solving skills. The classroom teachings, laboratory experiences and work on an engineering fluids project have been designed so that the students receive a broad range of introductory exposure to fluid mechanics with relevant applications of the theory. This paper highlights an overview of the course curriculum and assessment procedures for achieving excellence in teaching and research. It is anticipated that the students will be competent to make use of the advanced knowledge gained in this course in their professional career
 
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English (19)