Books by Agus Pulung SASMITO
The design of a polymer electrolyte fuel cell (PEFC) stack requires careful consideration of ther... more The design of a polymer electrolyte fuel cell (PEFC) stack requires careful consideration of thermal, water, and gas management to ensure high stack performance in operation. This work aims to develop a mathematical and numerical model for PEFC stacks that serves two objectives: the first involves a study of the fundamental aspects of the PEFC and the associated transport phenomena, electrochemical processes and multiphase flow for a single cell as well as a stack. The second objective concerns the development and integration of applied research for the PEFC single cell and stack, including new designs and related management issues (thermal, gas, and water) to achieve an enhanced fuel cell performance. This book provides basic guidelines for fuel cell engineers to design and enhance fuel cell performance.
Drying is an important unit operation used in numerous industries and well known as a dominant in... more Drying is an important unit operation used in numerous industries and well known as a dominant industrial consumer of fossil fuel-derived energy in developed countries. As standard of living rises in the developing world energy usage for drying operations will rise along with the demand for energy-efficient, faster, environmentally friendly (minimal carbon foot print) and cost-effective drying technologies will continue to increase worldwide. Indeed, the growth in energy consumption for drying will increase at a higher pace in the rapidly developing world, in particular the rapidly developing as well as very large economies of China, Brazil and India. As the fuel prices rise, it is necessary to develop sustainable drying technologies using renewable sources using innovative ideas. Drying of food products has been a very important industrial sector for many years. This is also reflected in the continuing success of the International Drying Symposium (IDS) series and numerous sister conferences as a well as a premier archival journal devoted exclusively to drying science, technology and engineering. Drying R&D seems to have reached a sustainable level of activity around the globe, still there is tremendous scope to carry out R&D in this complex process.
For a long time I have thought of and even planned to offer a new type of assignment leading to s... more For a long time I have thought of and even planned to offer a new type of assignment leading to some new pedagogy in teaching advanced level postgraduate course in Heat and Mass Transfer. Essentially it is based on the well known and well-practiced Problem-based learning (PBL) approach. Students are expected to self-learn based on carefully chosen problems the solutions of which require groups of students to carry out appropriate searches on their own. This experience is very valuable despite some inherent limitations that should be covered elsewhere in the curriculum.
Papers by Agus Pulung SASMITO
International Journal of Mining and Mineral Engineering, 2017
Applied Mechanics Reviews, 2016
Journal of Chemistry, 2015
Journal of Natural Gas Science and Engineering, 2016
Applied Thermal Engineering, 2016
Mineral commodity prices have decreased swiftly since 2012. For example, gold price, which was ab... more Mineral commodity prices have decreased swiftly since 2012. For example, gold price, which was above $1800 per ounce, is currently about $1250 per ounce. Price slumps were even more severe in the base metals. Furthermore, the resource degradation and complex geologic conditions give rise to operation costs. As a result, many mining operations and development projects were eventually suspended, cancelled or ceased. Environmental compliance is also another challenge to the mining industry. The fuel consumed by diesel trucks emits greenhouse gases, which are one of contributors to the global warming. In Canada, the provinces of Quebec, British Columbia and Alberta introduced carbon taxes with the objective of reducing gas emissions in attempt to mitigate climate change. In this scope, only way to stay in business for a mining company is to invest more efficient and environmental friendly production practices such that operation costs are reduced. Given that maintenance costs and energy consumption are the largest contributors to operation costs, the minimization of carbon emissions and the maximi-zation of equipment availability would be beneficial. This paper addresses to quantify the relationship between equipment reliability and energy consumption through a case study. It shows that a maintenance policy based on equipment reliability can significantly reduce energy consumption and its associated gas emissions.
Biofuel Research Journal, 2016
矿业科å¦æŠ€æœ¯å¦æŠ¥ 英文版, 2014
ABSTRACT Presence of fine dust in air causes serious health hazard for mine operators resulting i... more ABSTRACT Presence of fine dust in air causes serious health hazard for mine operators resulting in such serious problems as coal workers’ pneumoconiosis and silicosis. Major sources of dust appear of course along the mining face where the minerals are extracted. Proper control and management are required to ensure safe working environment in the mine. Here, we utilize the computational fluid dynamic (CFD) approach to evaluate various methods used for mitigating dust dispersion from the mining face and for ensuring safe level of dust concentration in the mine tunnel for safety of the operators. The methods used include: application of blowing and exhaust fans, application of brattice and combination of both. The results suggest that among the examined methods, implementation of appropriately located brattice to direct the flow from the main shaft to the mining face is the most effective method to direct dust particles away from the mining face.
Energy Conversion and Management, 2015
International Communications in Heat and Mass Transfer, 2014
ABSTRACT This study addresses heat transfer performance of laminar non-Newtonian fluid flow in va... more ABSTRACT This study addresses heat transfer performance of laminar non-Newtonian fluid flow in various configurations of coiled square tubes e.g., in-plane spiral ducts, helical spiral ducts and conical spiral ducts. The non-Newtonian fluid considered in this study is the aqueous solution of carboxymethyl cellulose (CMC) which is modeled as power-law fluid. Effects of tube geometries, power-law index (concentration of CMC) and other parameters are quantified and discussed to analyze flow behavior and heat transfer performance. Results are compared with those for a straight square tube of the same length as that used to form the coils. A Figure of Merit is defined to compare the heat transfer performance of different geometries with respect to the pumping power. The results suggest that CMC solution yields better heat transfer performance of about twice than that of water at Re ~ 1000. Among all considered designs, helical coil gives the best heat transfer performance; however, when the pumping power is considered, in-plane coil design performs the best in term of Figure of Merit.
Industrial & Engineering Chemistry Research, 2014
ABSTRACT The objective of the study is to investigate the effects of inlet flow pulsation on the ... more ABSTRACT The objective of the study is to investigate the effects of inlet flow pulsation on the mixing and reaction performance of a heterogeneous gaseous T-junction micro-reactor numerically. The idea is to have a novel modular micro-reactor design comprises two micro-reactors (A and B) arranged in parallel and a valve to control the flow direction. Flow pulsation can then be implemented to alternately supply reactant to the micro-reactor A and micro-reactor B. Hence, by feeding same amount of reactant and thus same pumping power/parasitic loads, the new design is able to run two microreactors and could achieve almost the same level of performance as that of steady flow microreactor with an expense of one microreactor. The study was carried out for a case of mixing and heterogeneous catalytic reaction of methane (gaseous fuel) oxidation at the micro-reactor surface coated with a platinum catalyst. A detailed parametric study was performed to include the effect of frequency, amplitude, phase difference and different waveforms on the conversion rate of gaseous fuel and pressure drop across the micro-reactor. The results suggest that the flow pulsation marginally affects the reaction performance, in which, the whole novel modular system produces almost double yields and energy (temperature) than that of conventional steady flow single micro-reactor design under the same amount of inlet reactants. This highlights the potential of this novel design in saving energy, enhancing reactants utilization and increasing yield production for several applications.
Applied Thermal Engineering, 2015
ABSTRACT The advancement of technological development in underground mines together with increasi... more ABSTRACT The advancement of technological development in underground mines together with increasing demands of raw materials while ore deposit in the surface depleted continuously, has led underground mines to go even deeper – up to more than 3 km nowadays. As mine delves deeper into the earth, the rock pressure and virgin rock temperature rise, which in turn have an adverse effect on the environment and thus lead to a higher cost. Typically, air ventilation itself is not sufficient to remove the heat generated, whence air conditioning system has to be added. This paper evaluates thermal management in underground mines via computational fluid dynamics approach. The three-dimensional underground cul-de-sac tunnel model together with its ventilation auxiliary and mining machinery is developed comprising conservation equations of turbulent mass, momentum and energy. Effect of ventilation flow rate, cooling load, virgin rock temperature and the heat rejection from mining machinery were evaluated with regards to the thermal comfort. Finally, this model can be used to develop an optimum or near-to-optimum ventilation and air-conditioning strategy in underground environment.
Fuel Cells, 2014
This paper presents an experimental investigation of the effect of hydrogen purging time period a... more This paper presents an experimental investigation of the effect of hydrogen purging time period and duration on the performance of a proton exchange membrane (PEM) fuel cell stack with a dead-end anode. The objective is to develop a better understanding of the interactions between the purging parameters and the cathode air-stoichiometry. It employs a full factorial approach for three factors (purging period, purging duration and air-stoichiometry) with two levels and three replications. The study is performed on a 300 cm 2 , 24-cell PEM fuel cell stack with the rated power of 1.5 kW. The stack was operated with water cooling, fully humidified air and dry hydrogen at the ambient pressure. The results showed that the stack performance is significantly influenced by the interactions of the purging parameters and the cathode air-stoichiometry. The least square model was utilized to determine the optimum values of these parameters with regard to the stack performance and hydrogen utilization. For the present stack, the optimum values of 2 parameters were: purging period of 3 min, purging duration of 4 s and the cathode airstoichiometry of 200%.
ECS Transactions, 2013
The dynamic behavior of the PEM fuel cell performance is one of the main factors for successful o... more The dynamic behavior of the PEM fuel cell performance is one of the main factors for successful operation of fuel cell vehicle. Maintaining fast time response whilst keeping stable and high stack performance is of importance, especially during acceleration and deceleration. In a PEM fuel cell with a dead-end anode, it is well known that the water accumulates at the anode side, the nitrogen crosses over from cathode to anode which, in turn, reduces the available hydrogen concentration for electrochemical reaction and, thus, deteriorate the fuel cell performance over time.
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Books by Agus Pulung SASMITO
Papers by Agus Pulung SASMITO