Bidyut Baran Saha

Kyushu University | Kyudai · International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)

Nearly two billion air-conditioning (AC) units are currently being used for space cooling worldwide. The majority of these ACs use R134a as the working fluid, a greenhouse gas (GHG) with a global warming potential (GWP) of 1300 kg-CO2-eq. According to the rules set by the world environment safety organization, the GWP of domes- tic air-conditioning...

This review study examines flow boiling heat transfer in micro-fin tubes using mixed and pure refrigerants with zero ozone-depleting potential (ODP) and minimal global warming potential (GWP). This investigation focuses on the extraordinary relationship between heat transfer coefficients (HTCs) and vapor quality. Since the introduction of micro-fin...

In this research, three W-shaped ribs are taken to analyze their influence on the heat transfer rate in the internal cooling of a gas turbine blade at constant e/Dh (0.037) and heat flux. The ribs are located on rectangular channels in a square duct, and the experiments are conducted for low Reynolds numbers (12,000–20,000). The influence of Reynol...

To further the deployment of adsorption cooling systems for various applications, the cooling potential assessment of novel activated carbon-based pairs with R32 refrigerant is carried out in this work. The compositions of Maxsorb-III activated carbon with H25 Graphene nanoplatelets (GNP), 1-Hexyl-3-methylimidazolium bis(trifluormethylsulfonyl)imid...

Background and Objective: In addition to the reduction of risk of COVID-19 transmission and mortality, vaccination and compliance with the preventive measures of COVID-19 may have important additional benefits for the improvement of mental health. This study examined the levels and determinants of vaccination, compliance with preventive measures, a...

Fossil fuel consumption has triggered worries about energy security and climate change; this has promoted hydrogen as a viable option to aid in decarbonizing global energy systems. Hydrogen could substitute for fossil fuels in the future due to the economic, political, and environmental concerns related to energy production using fossil fuels. Howe...

Radionuclide-contaminated water is carcinogenic and poses numerous severe health risks and environmental dangers. The activated carbon (AC)-based adsorption technique has great potential for treating radionuclide-contaminated water due to its simple design, high efficiency, wide pH range, quickness, low cost and environmental friendliness. This cri...

Global energy demand has risen due to rapid development and overpopulation. Heating, ventilation, and air conditioning (HVAC) systems consume over half of all energy consumed in buildings and account for 10 to 20% of overall energy consumption in developed countries. Worldwide, energy-intensive vapor compression systems are employed for HVAC applic...

Arsenic waste must be carefully managed because of the adverse effects of arsenic in wastewater on the ecosystem. In the present study, an environmentally friendly novel composite of Chlorella vulgaris microalgae and nano-zero valent iron (NZVI) was employed as an adsorbent to eliminate arsenic from the aqueous environment. Fourier Transform Infrar...

Scholars studied chemostat model with variable yield coefficient and a growth rate in Monod expression for the existence of natural oscillations in a bioreactor. This article explores dynamical properties of a similar simple model, analytically and numerically, in which the growth rate is a modified Haldane expression. Study includes determination...

In recent times, the worldwide energy demand has dramatically increased along with ever-rising concerns about environmental deterioration associated with energy production using fossil fuels. There is a global urge to produce the required energy in a sustainable way, and the world is moving at a fast pace to be familiar with renewables. Unfortunate...

Nowadays, the research on the adsorption cooling system is increased significantly due to safeguarding the adverse environmental effect of the conventional vapor compression system. The conventional system uses refrigerants having very high GWP and ODP and consumes a huge amount of electrical energy. On the other hand, the adsorption system is driv...

Adsorption desalination is prescribed as a promising and eco-friendly solution for mitigating water scarcity, owing to its utilization of low-grade thermal waste and zero liquid brine discharge. The keystones that regulate the performance of the adsorption desalination system (ADS) include nature of adsorbents, system design, and operating conditio...

Recently metal organic frameworks (MOFs), already known as adsorbent materials, have gained increasing research interest in thermal energy storage and conversion. MOF-water working pairs have been envisaged to provide the next revolutionary advancement in the existing sorption-based thermal energy storage and conversion systems. Herein, a promising...

HFOs are currently being adopted for adsorption refrigeration applications due to their zero ozone depletion potential and paltry global warming potential. In this study, a constant volume variable pressure (CVVP) system is designed and built to experimentally investigate the adsorption characteristics of HFO-1234ze(E) onto Maxsorb III. Experiments...

Low global warming potential (GWP) refrigerants for the next-generation air conditioning systems have been investigated with target domestic applications. High-GWP refrigerants are mostly used in climate control applications such as heating, ventilation and air conditioning (HVAC) and refrigeration systems. The majority of refrigerants are responsi...

This article presents the thermodynamic assessment of an advanced adsorption chiller with an aim towards entropy generation minimization through the selection of appropriate operating strategies, temperatures, and design modifications. The present study carries out a second law analysis of a two-bed silica gel water pair-based adsorption cooling sy...

The adsorption system is considering as a promising alternative as it is driven by low grade heat and use natural refrigerants. The low performance and geometrical shape is the main problem to widely commercialize the system. To increase the performance and reduce the size of the system, this study investigated the adsorption properties of carbon d...

This paper explores the impact of remittance on multidimensional energy poverty in Bangladesh by employing a nationally representative Household Income and Expenditure Survey (HIES)-2016 with a sample size of 46,080 households. Remittance is one of the sources of household income that can be utilized for energy services. Energy poverty is generally...

Molybdenum disulfide (MoS2) thin films were produced on Si/SiO2 substrate by low pressure sulfurization of molybdenum (Mo) film. Mo films are treated with sulfur vapor at different temperatures to investigate the effect of growth temperature on the structural and morphological features of MoS2 films. Raman measurements confirmed the existence of mu...

Copper zinc tin sulfide (CZTS) can be considered an important absorber layer material for utilization in thin film solar cell devices because of its non-toxic, earth abundance, and cost-effective properties. In this study, the effect of molybdenum disulfide (MoS2) as a buffer layer on the different parameters of CZTS-based solar cell devices was ex...

The usage of metal organic frameworks (MOFs) as adsorbent materials for adsorption-based heat transformation applications is gaining popularity among the research society due to their S-shaped water adsorption isotherms. Apart from the S-shaped isotherms, there are other two key features that need to be kept in mind when working with MOF/water pair...

Metal-organic frameworks (MOFs) are inorganic-organic hybrid porous crystalline materials featured by exceptionally high surface area, tunable porosity, and controllable chemical structures, making them efficient candidates for gas adsorption. HKUST-1 is a promising MOF constructed from the coordination bonding of copper paddle-wheel metal nodes an...

The production of algae within a short period has become an emerging issue among researchers due to its diversified usage. At the same time, researchers are working extensively on how to upsurge algae production using carbon dioxide. The motto of this study is to develop a fast algae production system utilizing carbon dioxide and employing mathemat...

Mangroves play a vital role in protecting the coastal community from the climate change effect and in the restoration of the coastal ecosystem. This research has been designed to determine the spatial and seasonal changes of potentially toxic elements’ (PTEs) concentration in sediments and their potential source contribution among the different hum...

MOFs (metal organic frameworks), a new type of porous coordination polymers (PCPs), has emerged as a novel class of adsorbent material that has piqued the interest of academics working on a variety of sorption-related applications all over the world. Adsorption heat pump research is no exception, and it has accelerated since the MOF adsorbents were...

This research investigates the differences in awareness and preference of racial groups toward the types of energy that they would like to see incorporated into the future energy system. Based on a national survey of 3000 respondents conducted in 2020, we analyze the differences in awareness, preferences and attitudes among racial groups in the US,...

Activated carbon (AC)/CO2 pair is very promising for developing an efficient adsorption cooling system (ACS). However, the low packing density and poor heat transfer properties of activated carbon-based ACS prevent their widespread adoption. Addressing these issues, this study focuses on the synthesis and characterization of AC-based consolidated c...

A set of thermal compressors (often referred to as adsorption beds) is employed in an adsorption heat pump (AHP) system to achieve the desired cooling, whereas electricity-driven compressors are used in a conventional vapor compression refrigeration system (VCRS). Although an AHP is much more environmentally friendly than VCRS, its massive size is...

In this work, hydrophobic copper micro-structured (HCM) surfaces are prepared to improve boiling heat transfer. A combination of chemical etching and heat treatment processes is employed to make the bare copper surface hydrophobic in nature. With the modification of wettability, a different micro-structured feature is developed on the surface. The...

The outstanding properties of metal-organic frameworks (MOFs) have proven that this type of crystalline adsorbent has great potential in CO2 capture applications. Most of the MOF research studies on new functional MOFs are conducted to improve the performance of CO2 gas adsorption. Combined studies of material evaluation and process design on engin...

Adsorption-assisted energy conversion technologies are receiving extensive attention recently as a sustainable technology for meeting the worldwide energy demand. The advancement of this technology relies on the development of the mass and heat transfer properties of the adsorbent materials. MOF-801, a zirconium-based microporous metal organic fram...

Carbon emissions and excessive power usage are addressed by applying thermoelectric cooling, which benefits from its ability to be portable, economical, and reliable. However, a conventional thermoelectric air conditioner's coefficient of performance (COP) is much less due to the sustained heat generated on the thermoelectric module's hot side. Thi...

The aim of this study is to provide comprehensive and update information concerning the utilization of low- and medium-temperature geothermal resources in Indonesia. This study includes several utilization technologies and identifies opportunities, challenges, and issues. Furthermore, to emphasize the promising potency of these potentials by gainin...

To further the research on R32 refrigerant-based adsorption cooling applications, Maxsorb-III activated carbon composites synthesized with the additives of H25 Graphene nanoplatelets (GNP), 1-Hexyl-3-methylimidazolium bis(trifluormethylsulfonyl)imide ([HMIM][Tf2N]) ionic liquid with polyvinyl alcohol (PVA) are studied for cooling performance evalua...

Nearly two billion airconditioning (AC) units are currently being used for space cooling worldwide. The majority of these ACs use R134a as the working fluid, a greenhouse gas (GHG) with a global warming potential (GWP) of 1300 kg-CO2-eq. According to the rules set by the world environment safety organizations, the GWP of domestic airconditioning sy...

Significant efforts have been done in order to improve adsorption desalination systems by developing advanced adsorbents. Silica-supported ionic liquid (SIL) has been recently proposed as a promising adsorption material for water desalination due to its relatively high adsorption capacity around 1 kgwater.kgSIL⁻¹. Such achieved performance can be c...

Current greenhouse gas emissions suggest that keeping global temperature increase below 1.5 degrees, as espoused in the Paris Agreements will be challenging, and to do so, the achievement of carbon neutrality is of utmost importance. It is also clear that no single solution can meet the carbon neutral challenge, so it is essential for scientific re...

Analysis of heat transfer around the components of multi-pass solar air heating collector and its performance enhancement has been presented using experimental approach. Radiation and convection heat transfer from the system covers and collector plate to the flowing airstreams in the collector system have been investigated. Geological porous matrix...

Children are considered to be especially vulnerable to energy poverty; however, there has been little empirical research on how energy poverty affects early childhood development in energy-poor countries. To overcome this, here we measure energy poverty and early child development using a multidimensional approach based on data from national multip...

The thermodynamic property surfaces such as enthalpy and entropy of an adsorbate + adsorbent systems are essential for designing adsorption-assisted thermal compression, gas storage, separation, and other applications. This paper presents the enthalpy (∆ho) and the entropy (∆so) of the adsorbent-adsorbate system under the barrier of Henry's law reg...

Environmentally benign adsorption heat pump (AHP) and desalination (AD) systems have already attracted considerable attention for space cooling/heating and potable water production since they require no electricity and are driven by solar or waste heat. The adsorbent material is the key element of these adsorption systems. Highly porous carbon-base...

This chapter focuses on a modern characterization technique, Atomic Force Microscopy (AFM), which uses nanoprobes to extract three-dimensional (3-D) images of surfaces. These 3-D images contain both qualitative and quantitative information. Qualitative information is useful for visually understand the differences between various adsorbents that inf...

Volatile organic compounds (VOCs) are a class of hazardous gaseous materials emitted from certain solids or liquids. They are thought to possess serious short- or long-term adverse effects on human health. Nowadays, an energy-efficient and cost-effective volatile organic compound removal system is of absolute necessity due to its adverse effects. I...

Activated carbon signifies extensive carbonized materials of a high degree of porosity and has a wide range of applications. The porous and thermal properties of activated carbon (AC) are primarily dependent on the chosen raw material and synthesis conditions. In this article, the thermophysical properties of twelve waste biomass-derived AC samples...

Adsorption cooling technologies driven by low-grade thermal or solar power are used as an energy-efficient alternative to conventional refrigeration and air conditioning systems. Explicit understanding of the adsorption cycles requires precise determination of the performance parameters, replication of the experimental data, and the rigorous study...

This study investigates how sustainable economic development in emerging nations could be enhanced by realizing opportunities presented by the demographic dividend, the digital economy, and ensuring energy efficiency. To date, the linkage between demographic dividend, digital innovation, energy intensity, and sustainable economic growth has not bee...

Arsenic poisoning has been a great concern for the last two decades because of its extensive problems. Coagulation, ion exchange, ultrafiltration, and adsorption systems have been used for the removal of arsenic from polluted water. In this study, the biosorption process was used owing to eco-friendly, simplicity, biodegradable, and cost effectiven...

The incapability of people to have sufficient access to energy sources is known as energy poverty. It is a multi-faceted and complex problem. This research looks into how renewable energy use, economic growth, urbanization, employment, and the consumer price index are all linked to energy poverty in South Asian nations. The relationship between the...

Hybrid renewable energy system (HRES) is an evolving power generation strategy that requires a combination of various energy resources and common in modern pursuits. Allowing features, such as low CO2 emissions, less environmentally damaging possibilities than traditional power generation techniques, and mostly unlimited power resources give more f...

Low-grade waste heat or renewable energy powered adsorption cooling system (ACS) is considered a potential alternative option to the conventional vapor compression system. Adsorbent/adsorbate pair is the key element of an ACS. Among several adsorbents, activated carbon (AC) is found very promising. The low packing density and poor heat transfer pro...

Metal organic frameworks (MOFs) are believed to be one of the most potential adsorbents for next generation adsorption heat transformation applications because of their incredible inherent features including ultra-high surface area, tunable porosity, and ability to incorporate functional groups for attracting adsorbate molecules. Besides, MOFs offe...

In recent years, the environmental implications of biomass energy use have become an emerging and debatable issue among policymakers. As biomass is one of the major traditional easy sources of energy, its impact on health and economy is justified in several studies. However, there is a scarcity of evidence on the use of biomass energy in climate ch...

Adsorption heat pump (AHP) technologies can help to protect the environment by reducing greenhouse gas emissions and increasing the use of natural refrigerants. The dynamic efficiency of an adsorbate-adsorbent pair is vitally important when developing an effective adsorption-based heat pump system. To design a system that can run under a variety of...

This study focuses on the synthesis of zirconium fumarate (MOF 801) and functionalization of this MOF by mixed valance metal doping. We have synthesized zirconium fumarate following an environment-friendly route and a modified sample of this MOF by in situ doping of a divalent transition metal ion, cobalt (Co 2+). The N2 adsorption behaviour of the...

The effective removal of strontium from polluted water is an emerging issue worldwide, especially in Japan, after the destruction of Fukushima’s Daiichi Nuclear Power Plant. In the strontium removal process, statistical optimization of associated factors is needed to reduce the quantity of chemicals and the number of experimental trials. In this st...

Accurate simulation and detailed description of the dynamics of the adsorption process play a significant role in forecasting the performance of new materials when used in various adsorption systems, like cooling/heating. The activated carbon (AC) consolidation allows improving the heat transfer rate inside the adsorption/desorption bed and compact...

To meet the growing energy demand, double pipe heat exchangers (DPHEX), which are used in a variety of energy and thermal engineering applications, require improved heat transfer performance. In this study, a new class of surfactant-free Ionanofluid is formulated at three different concentrations of 0.01, 0.05 and 0.10 wt% and thermophysical and rh...

Utilization of water as a refrigerant in adsorption cooling systems is a challenging task due to the unavailability of suitable adsorbents. Recently, a new class of porous material, metal-organic frameworks (MOFs), is heightening interest as the potential adsorbent for water adsorption due to its crucial S-shaped adsorption isotherm characteristics...

Cooling of high heat flux devices and electronics devices with a high heat dissipation system uses Boiling Heat Transfer (BHT). In this paper, a pool boiling heat transfer experiments conducted on saturated distilled water for a bare and microstructured copper surface prepared through chemical etching at atmospheric pressure. A two-step chemical et...

Spirulina platensis has been considered a promising source of food supplement to combat malnutrition worldwide. Numerous investigations have stated its immune activity, ability to absorb CO2 during the growth period, and antioxidant potential. Well-known theoretical biomass kinetic model sheds are capable of qualitative analysis of the fast microal...

Solid-gas adsorption has drawn considerable attention utilizing low-grade waste heat and environment-friendly refrigerants for cooling, heating, and air-conditioning. However, low sorption capacity of the adsorbents is a long-standing challenge for achieving highly efficient adsorption heat pumps. This study aims to analyze and compare the performa...

Synthesis and thermal characterization of paraffin-based nanocomposites for thermal energy storage applications, Thermal Science and Engineering Progress (2020), doi: https://doi. Abstract Nowadays, phase change materials (PCMs) have gained considerable attention for thermal energy storage applications. However, commonly used PCM, such as paraffin...

This study aims to analyze and compare the performance of transitional metal (10 % Ni and Co) doped aluminum fumarate metal organic frameworks as adsorbent materials in an adsorption-based heat pump where water is considered as the refrigerant. Porous properties of the in-situ metal doped aluminum fumarates namely the surface area and pore volume a...

The present study focuses on the synthesis and characterization of new composites comprising of RD silica gel and metal-organic framework (MOF) MIL 100(Fe) to upgrade the performance of the adsorption-based atmospheric water harvesting system. The impact of adding MIL 100(Fe) on the porous properties, thermal conductivity, and water adsorption char...

Cultural diversity is increasing in the US, which is likely to have an impact on preferences toward future energy policy. This research investigates people’s lived experience and preferences through a nationally representative survey (n = 3000) regarding the energy system, and how these relate to cultural group and other demographics. Our study hig...

The present study focuses on the synthesis and characterization of new composites comprising of RD silica gel and metal-organic framework (MOF) MIL 100(Fe) to upgrade the performance of the adsorption-based atmospheric water harvesting system. The impact of adding MIL 100(Fe) on the porous properties, thermal conductivity, and water adsorption char...

This paper presents a rigorous exergy analysis of a vapor compression refrigeration system (VCRS) for the AHRI standard cooling operating conditions assessed with a constant cooling load of 50 kW. A comprehensive mathematical model has been developed to evaluate thermodynamic variables of the major components. The analysis is carried out for widely...

The study focuses on improving operation and construction parameters that affect cooling performance novel adsorption chiller with a unified condenser-adsorbent bed. The effect of the variables on novel adsorption chiller is taken into consideration. The cooling performance of the chiller is analyzed using the central composite design and response...