Tahmid Rupam | Kyushu University (original) (raw)
Papers by Tahmid Rupam
Thermal Science and Engineering Progress
Thermal Science and Engineering Progress
Chemical Engineering Journal
International Journal of Heat and Mass Transfer
This thesis is an outcome of an exciting journey at Kyushu University, which was made possible by... more This thesis is an outcome of an exciting journey at Kyushu University, which was made possible by the support, care, advice, supervision, and encouragement from several individuals. It is an extremely pleasant opportunity for me to elicit my heartfelt thanks and gratefulness to all of them. To begin with, I express my deepest sense of gratitude and indebtedness to my supervisor Professor Bidyut Baran Saha for his precious guidance and inspiration throughout my master course. Success of this thesis work is due to his astute guidance and timely counsel on prioritizing the tasks. He provided me with a pleasant environment at laboratory and much required liberty to conduct my research work. His friendly demeanor and kind nature made my stay in Japan a thoroughly enjoyable experience. Interactions with him have facilitated broaden my perception in manifold aspects of life. I anticipate continuing these interactions and getting opportunities to work with him in the future as well. I would like express my gratitude to Professor Seigi Mizuno for giving me an opportunity to do research in his laboratory and support me and taking time to examine the manuscript in spite of his busy academic schedule. I am also very thankful to his PhD student Mr. Rezwan Ahmed for helping me to understand the experimental apparatus and analyzing techniques.
Apart from solar and wind energy as a form of renewable energy, ocean can also be considered one ... more Apart from solar and wind energy as a form of renewable energy, ocean can also be considered one as approximately 2 to 3 billion MW power can be gained from it. Covering 71% of earth's surface the ocean is the largest solar energy collector absorbing about 70% of day's solar energy. On an average day the amount of heat energy absorbed by 60 million square kilometers of the tropical sea surfaces commensurate burning of 250 billion barrels of oil and when converted to electrical energy it can limit the demand of electricity for 260 million people per day. In this study we emphasized on converting this thermal energy from the sea to electrical energy in order to provide electricity to the isolated tropical islands. This can be practically done where there is at least 20 degrees Celsius temperature difference exists between the upper and lower surface of the ocean. The conversion process involves evaporating an intermediate fluid like ammonia or direct evaporation of the sea water of upper surface and in both case cold water from lower surface performs the condensing task. Though the converted electrical energy is not sufficient for a large power plant but it can be an alternate source for the remote isolated islands where power from central grid cannot be reached. Apart from this, byproducts like pure desalinated water that can be used for pure drinking water and in agriculture sector of those islands; salt and cold water from the lower sea surface and this water can be used as industrial cooling of those islands. .
Microporous and Mesoporous Materials, 2021
Abstract In this study, consolidated composite adsorbents comprising highly porous zeolite of typ... more Abstract In this study, consolidated composite adsorbents comprising highly porous zeolite of type AQSOA-Z02 and two types of graphene nanoplatelets (GNPs), namely H25-GNPs and M25-GNPs, are developed to enhance the performance of a thermally powered adsorption heat pump. The thermophysical properties such as specific heat capacity, packing density, thermal conductivity, and porosity of the synthesized composite adsorbents are rigorously investigated. The addition of GNPs into zeolite improves the packing density as well as the thermal conductivity significantly. The highest thermal conductivity is observed for 50 wt% H25-GNPs contained composite, which is almost 127 times higher than the parent zeolite. Porous property investigation reveals that the fabricated composites are microporous, like the parent zeolite. Besides, the equilibrium adsorption uptake of water onto the composite adsorbents is measured gravimetrically at three different temperatures, 30, 50, and 70 °C. The experimental uptake data are correlated with the modified Langmuir, Sun and Chakraborty, and Universal models to describe the adsorption process mathematically. It was found that 20 wt% H25-GNPs contained composite provides almost 43% improvement of effective volumetric uptake over the parent zeolite. All the presented findings would carry significant importance for the development of an efficient and compact adsorption heat pump system. Besides, the obtained results would be very supportive for designing zeolite composite based gas separation and storage, desalination, and thermal energy storage systems.
Sustainable Materials and Technologies
Green buildings or eco-friendly buildings mostly concentrate on the efficient use of energy in ho... more Green buildings or eco-friendly buildings mostly concentrate on the efficient use of energy in house hold electromechanical equipment. In an over populated country like Bangladesh where only 62% of its people are having the privilege of using electricity and which is not sufficient (only 7000-8000MW) for a country like Bangladesh. Moreover 46% to 50% of this energy is consumed in the resident buildings creating an enormous pressure on fulfilling the demand of electricity. As a result of this industries are burning gas, coal, oil etc. to harness energy which emits greenhouse gases causing environmental pollution. In this study we emphasis on redesigning these buildings in a way that utilizes Siting and structure design efficiency, Energy efficiency, Water efficiency, Materials efficiency, Indoor environmental quality enhancement, Operations and maintenance optimization, Waste reduction. By doing this we can abate the dependency on electric energy of those buildings to a great extent.
Thermal science and engineering, 2021
Low-temperature waste heat-powered adsorption heat transformation (AHT) is an energy-efficient an... more Low-temperature waste heat-powered adsorption heat transformation (AHT) is an energy-efficient and green technology, which is considered a promising alternative to the conventional vapor compression systems. The performance of an AHT system generally depends on the properties of adsorbents and adsorbates. The poor heat transfer and low packing density of adsorbent materials are the main limiting factors of an AHT system. Several researchers are working on composite adsorbents to overcome these drawbacks, and they observed enhanced thermal conductivity, packing density and volumetric adsorption capacity, which are very favorable to develop an efficient and compact system. There is hardly found any complete review on the composite adsorbents for heat transformation applications. This manuscript presents a comprehensive review of composite adsorbents' thermophysical and adsorption properties developed so far for the AHT applications. This review also provides future research direct...
Bangladesh being an over-populated country needs to produce a huge amount of energy to meet its p... more Bangladesh being an over-populated country needs to produce a huge amount of energy to meet its people’s demands. On the other hand, it is quiet impossible to provide the large population with adequate energy with the conventional way of producing energy. Only 62% of our people have the privilege of using electricity. So apart from finding cost effective ways to harness energy, it is required to use the produced energy efficiently. This paper aims to find a way to reduce the pressure on grid energy by empowering the street lights using solar panels. In this regard, it also focuses on having a smart charge controller circuit for ensuring battery longevity. Here PIC16F876A microcontroller has been used to sense different voltage levels and make decisions according to them. The CCP module of the microcontroller has been used for a variable duty cycle PWM signal to adjust the brightness of the LED street lights according to necessity. The intensity of the street light will be automatica...
Journal of Molecular Liquids
Chemical Engineering Journal Advances
Heat Transfer Engineering
Colloids and Surfaces A: Physicochemical and Engineering Aspects
Applied Thermal Engineering
Thermal Science and Engineering Progress
Thermal Science and Engineering Progress
Chemical Engineering Journal
International Journal of Heat and Mass Transfer
This thesis is an outcome of an exciting journey at Kyushu University, which was made possible by... more This thesis is an outcome of an exciting journey at Kyushu University, which was made possible by the support, care, advice, supervision, and encouragement from several individuals. It is an extremely pleasant opportunity for me to elicit my heartfelt thanks and gratefulness to all of them. To begin with, I express my deepest sense of gratitude and indebtedness to my supervisor Professor Bidyut Baran Saha for his precious guidance and inspiration throughout my master course. Success of this thesis work is due to his astute guidance and timely counsel on prioritizing the tasks. He provided me with a pleasant environment at laboratory and much required liberty to conduct my research work. His friendly demeanor and kind nature made my stay in Japan a thoroughly enjoyable experience. Interactions with him have facilitated broaden my perception in manifold aspects of life. I anticipate continuing these interactions and getting opportunities to work with him in the future as well. I would like express my gratitude to Professor Seigi Mizuno for giving me an opportunity to do research in his laboratory and support me and taking time to examine the manuscript in spite of his busy academic schedule. I am also very thankful to his PhD student Mr. Rezwan Ahmed for helping me to understand the experimental apparatus and analyzing techniques.
Apart from solar and wind energy as a form of renewable energy, ocean can also be considered one ... more Apart from solar and wind energy as a form of renewable energy, ocean can also be considered one as approximately 2 to 3 billion MW power can be gained from it. Covering 71% of earth's surface the ocean is the largest solar energy collector absorbing about 70% of day's solar energy. On an average day the amount of heat energy absorbed by 60 million square kilometers of the tropical sea surfaces commensurate burning of 250 billion barrels of oil and when converted to electrical energy it can limit the demand of electricity for 260 million people per day. In this study we emphasized on converting this thermal energy from the sea to electrical energy in order to provide electricity to the isolated tropical islands. This can be practically done where there is at least 20 degrees Celsius temperature difference exists between the upper and lower surface of the ocean. The conversion process involves evaporating an intermediate fluid like ammonia or direct evaporation of the sea water of upper surface and in both case cold water from lower surface performs the condensing task. Though the converted electrical energy is not sufficient for a large power plant but it can be an alternate source for the remote isolated islands where power from central grid cannot be reached. Apart from this, byproducts like pure desalinated water that can be used for pure drinking water and in agriculture sector of those islands; salt and cold water from the lower sea surface and this water can be used as industrial cooling of those islands. .
Microporous and Mesoporous Materials, 2021
Abstract In this study, consolidated composite adsorbents comprising highly porous zeolite of typ... more Abstract In this study, consolidated composite adsorbents comprising highly porous zeolite of type AQSOA-Z02 and two types of graphene nanoplatelets (GNPs), namely H25-GNPs and M25-GNPs, are developed to enhance the performance of a thermally powered adsorption heat pump. The thermophysical properties such as specific heat capacity, packing density, thermal conductivity, and porosity of the synthesized composite adsorbents are rigorously investigated. The addition of GNPs into zeolite improves the packing density as well as the thermal conductivity significantly. The highest thermal conductivity is observed for 50 wt% H25-GNPs contained composite, which is almost 127 times higher than the parent zeolite. Porous property investigation reveals that the fabricated composites are microporous, like the parent zeolite. Besides, the equilibrium adsorption uptake of water onto the composite adsorbents is measured gravimetrically at three different temperatures, 30, 50, and 70 °C. The experimental uptake data are correlated with the modified Langmuir, Sun and Chakraborty, and Universal models to describe the adsorption process mathematically. It was found that 20 wt% H25-GNPs contained composite provides almost 43% improvement of effective volumetric uptake over the parent zeolite. All the presented findings would carry significant importance for the development of an efficient and compact adsorption heat pump system. Besides, the obtained results would be very supportive for designing zeolite composite based gas separation and storage, desalination, and thermal energy storage systems.
Sustainable Materials and Technologies
Green buildings or eco-friendly buildings mostly concentrate on the efficient use of energy in ho... more Green buildings or eco-friendly buildings mostly concentrate on the efficient use of energy in house hold electromechanical equipment. In an over populated country like Bangladesh where only 62% of its people are having the privilege of using electricity and which is not sufficient (only 7000-8000MW) for a country like Bangladesh. Moreover 46% to 50% of this energy is consumed in the resident buildings creating an enormous pressure on fulfilling the demand of electricity. As a result of this industries are burning gas, coal, oil etc. to harness energy which emits greenhouse gases causing environmental pollution. In this study we emphasis on redesigning these buildings in a way that utilizes Siting and structure design efficiency, Energy efficiency, Water efficiency, Materials efficiency, Indoor environmental quality enhancement, Operations and maintenance optimization, Waste reduction. By doing this we can abate the dependency on electric energy of those buildings to a great extent.
Thermal science and engineering, 2021
Low-temperature waste heat-powered adsorption heat transformation (AHT) is an energy-efficient an... more Low-temperature waste heat-powered adsorption heat transformation (AHT) is an energy-efficient and green technology, which is considered a promising alternative to the conventional vapor compression systems. The performance of an AHT system generally depends on the properties of adsorbents and adsorbates. The poor heat transfer and low packing density of adsorbent materials are the main limiting factors of an AHT system. Several researchers are working on composite adsorbents to overcome these drawbacks, and they observed enhanced thermal conductivity, packing density and volumetric adsorption capacity, which are very favorable to develop an efficient and compact system. There is hardly found any complete review on the composite adsorbents for heat transformation applications. This manuscript presents a comprehensive review of composite adsorbents' thermophysical and adsorption properties developed so far for the AHT applications. This review also provides future research direct...
Bangladesh being an over-populated country needs to produce a huge amount of energy to meet its p... more Bangladesh being an over-populated country needs to produce a huge amount of energy to meet its people’s demands. On the other hand, it is quiet impossible to provide the large population with adequate energy with the conventional way of producing energy. Only 62% of our people have the privilege of using electricity. So apart from finding cost effective ways to harness energy, it is required to use the produced energy efficiently. This paper aims to find a way to reduce the pressure on grid energy by empowering the street lights using solar panels. In this regard, it also focuses on having a smart charge controller circuit for ensuring battery longevity. Here PIC16F876A microcontroller has been used to sense different voltage levels and make decisions according to them. The CCP module of the microcontroller has been used for a variable duty cycle PWM signal to adjust the brightness of the LED street lights according to necessity. The intensity of the street light will be automatica...
Journal of Molecular Liquids
Chemical Engineering Journal Advances
Heat Transfer Engineering
Colloids and Surfaces A: Physicochemical and Engineering Aspects
Applied Thermal Engineering
Bangladesh being an over-populated country needs to produce huge amount of energy to meet its peo... more Bangladesh being an over-populated country needs to produce huge amount of energy to meet its people’s demands. On the other hand it is quiet impossible for her to provide them with sufficient energy with the conventional way of producing energy due to her being a developing
third world country. Only 62% of her people have the privilege of using electricity. So apart from finding cost effective ways to harness energy we should also look forward to using the produced energy efficiently. In this project we look to find a way to reduce the pressure on grid energy by empowering the street lights using solar panels. In this regard we also focus on having a smart solar charge controller circuit for ensuring battery longevity. In this project PIC16F876A microcontroller has been used to sense different voltages and make some decision according to them. The CCP module of the microcontroller has been used for a variable duty cycle PWM signal to adjust the brightness of the LED street lights. By the use of LED street lights the reduction of the consumption of energy was ensured. Apart from this, it can also be used for the electrification of remote places using solar energy as the smart solar charge controller is cost effective and easy to implement.
" Access to Information for all " that ensure the balanced development from root to vertex of a c... more " Access to Information for all " that ensure the balanced development from root to vertex of a country. As village is considered as the root of every country in South Asia, it is needed to ensure the sustainable development for every village.Concept of Smart Village is arisen for this purpose where each villager is kept under the service of ICT that minimize the digital distance between urban and rural and escort the digital service along with technical help and vocational training in front of the villager's door and make their lifestyle easier and drive their economic progress. But the poor illiterate villagers do not have the luxury of accessing modern technology due to poverty and also can not gain knowledge from the internet due to their lack of education. So, there must be a group of scholars along with some dedicated volunteers and professionals working under an institution in every village to make it a smart village and contribute to the development of the country. Information, Innovation & Implementation Center (IIIC) is such an institution which will dedicatedly work on different sectors in transforming a village into a smart and sustainable one.
