The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform
Idyut Bara Saha - One of the best experts on this subject based on the ideXlab platform.
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specific heat capacities of carbon based adsorbents for adsorption heat Pump Application
Applied Thermal Engineering, 2018Co-Authors: Kyaw Thu, Sourav Mitra, Kutub Uddi, Md Amirul Islam, Jongboong Lee, Idyut Bara SahaAbstract:Abstract Microporous adsorbents have been extensively employed in various sorption cycles. The specific heat capacity of such porous materials is an important parameter in adsorption simulation and system design. This article discusses the experimental evaluation of the specific heat capacities of several carbon-based adsorbents for cooling Applications. The studied adsorbents include (i) parent Maxsorb III with different particle sizes, (ii) surface treated Maxsorb III (H2 and KOH-H2) (iii) recently developed spherical activated carbon (KOH treated phenol resin, KOH6-PR) and (iv) expanded graphite. The specific heat capacity of these materials is measured at temperatures ranging from 30 °C to 150 °C using a heat flux type differential scanning calorimeter (DSC). Within the experimental conditions, no phase transition or thermal anomaly is detected for all the adsorbents. Surface treated adsorbent exhibits higher specific heat capacities whilst KOH treated phenol resin (KOH6-PR) has the lowest value among the studied adsorbents. High specific heat capacities in the surface treated Maxsorb III might be attributed to the effect of surface treatment and the presence of surface functional group. The model given by Perry and Green is employed to fit the experimental data. These experimental data together with the fitted parameters are essential in the design and simulation of adsorption heat Pump systems.
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study on biomass derived activated carbons for adsorptive heat Pump Application
International Journal of Heat and Mass Transfer, 2017Co-Authors: Animesh Pal, Kyaw Thu, Sourav Mitra, Ibrahim I Elsharkawy, Idyut Bara Saha, Hyun Sig Kil, Seong Ho YooAbstract:Abstract Biomasses are renewable resources and suitable precursors for synthesis of activated carbons (ACs). Two biomass sources: (i) Waste Palm Trunk (WPT) and (ii) Mangrove (M) are employed to synthesis activated carbons with huge surface area by chemical activation with potassium hydroxide (KOH). Thermophysical characteristics of the derived activated carbons namely thermal conductivity, particle size distribution, pore size distribution, surface area and pore volume are assessed. The total surface area of WPT-derived AC and mangrove-derived AC are found to be as high as 2927 m 2 g −1 and 2924 m 2 g −1 , respectively. The adsorption capacities of the synthesized biomass-derived ACs for ethanol are evaluated for assorted temperature and pressure conditions. It is observed that WPT-AC shows an ethanol uptake of 1.90 kg kg −1 whilst the M-AC can adsorb up to 1.65 kg kg −1 . The isosteric heat of adsorption associated with the present adsorbents/adsorbate (ACs/ethanol) calculated at different coverages showed only marginal difference. For a typical operating condition of adsorption heat Pump, both biomass derived ACs showed similar net ethanol uptake which is significantly higher than the net uptake of commercially prevalent Maxsorb III AC.
Kyaw Thu - One of the best experts on this subject based on the ideXlab platform.
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specific heat capacities of carbon based adsorbents for adsorption heat Pump Application
Applied Thermal Engineering, 2018Co-Authors: Kyaw Thu, Sourav Mitra, Kutub Uddi, Md Amirul Islam, Jongboong Lee, Idyut Bara SahaAbstract:Abstract Microporous adsorbents have been extensively employed in various sorption cycles. The specific heat capacity of such porous materials is an important parameter in adsorption simulation and system design. This article discusses the experimental evaluation of the specific heat capacities of several carbon-based adsorbents for cooling Applications. The studied adsorbents include (i) parent Maxsorb III with different particle sizes, (ii) surface treated Maxsorb III (H2 and KOH-H2) (iii) recently developed spherical activated carbon (KOH treated phenol resin, KOH6-PR) and (iv) expanded graphite. The specific heat capacity of these materials is measured at temperatures ranging from 30 °C to 150 °C using a heat flux type differential scanning calorimeter (DSC). Within the experimental conditions, no phase transition or thermal anomaly is detected for all the adsorbents. Surface treated adsorbent exhibits higher specific heat capacities whilst KOH treated phenol resin (KOH6-PR) has the lowest value among the studied adsorbents. High specific heat capacities in the surface treated Maxsorb III might be attributed to the effect of surface treatment and the presence of surface functional group. The model given by Perry and Green is employed to fit the experimental data. These experimental data together with the fitted parameters are essential in the design and simulation of adsorption heat Pump systems.
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study on biomass derived activated carbons for adsorptive heat Pump Application
International Journal of Heat and Mass Transfer, 2017Co-Authors: Animesh Pal, Kyaw Thu, Sourav Mitra, Ibrahim I Elsharkawy, Idyut Bara Saha, Hyun Sig Kil, Seong Ho YooAbstract:Abstract Biomasses are renewable resources and suitable precursors for synthesis of activated carbons (ACs). Two biomass sources: (i) Waste Palm Trunk (WPT) and (ii) Mangrove (M) are employed to synthesis activated carbons with huge surface area by chemical activation with potassium hydroxide (KOH). Thermophysical characteristics of the derived activated carbons namely thermal conductivity, particle size distribution, pore size distribution, surface area and pore volume are assessed. The total surface area of WPT-derived AC and mangrove-derived AC are found to be as high as 2927 m 2 g −1 and 2924 m 2 g −1 , respectively. The adsorption capacities of the synthesized biomass-derived ACs for ethanol are evaluated for assorted temperature and pressure conditions. It is observed that WPT-AC shows an ethanol uptake of 1.90 kg kg −1 whilst the M-AC can adsorb up to 1.65 kg kg −1 . The isosteric heat of adsorption associated with the present adsorbents/adsorbate (ACs/ethanol) calculated at different coverages showed only marginal difference. For a typical operating condition of adsorption heat Pump, both biomass derived ACs showed similar net ethanol uptake which is significantly higher than the net uptake of commercially prevalent Maxsorb III AC.
Md Amirul Islam - One of the best experts on this subject based on the ideXlab platform.
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specific heat capacities of carbon based adsorbents for adsorption heat Pump Application
Applied Thermal Engineering, 2018Co-Authors: Kyaw Thu, Sourav Mitra, Kutub Uddi, Md Amirul Islam, Jongboong Lee, Idyut Bara SahaAbstract:Abstract Microporous adsorbents have been extensively employed in various sorption cycles. The specific heat capacity of such porous materials is an important parameter in adsorption simulation and system design. This article discusses the experimental evaluation of the specific heat capacities of several carbon-based adsorbents for cooling Applications. The studied adsorbents include (i) parent Maxsorb III with different particle sizes, (ii) surface treated Maxsorb III (H2 and KOH-H2) (iii) recently developed spherical activated carbon (KOH treated phenol resin, KOH6-PR) and (iv) expanded graphite. The specific heat capacity of these materials is measured at temperatures ranging from 30 °C to 150 °C using a heat flux type differential scanning calorimeter (DSC). Within the experimental conditions, no phase transition or thermal anomaly is detected for all the adsorbents. Surface treated adsorbent exhibits higher specific heat capacities whilst KOH treated phenol resin (KOH6-PR) has the lowest value among the studied adsorbents. High specific heat capacities in the surface treated Maxsorb III might be attributed to the effect of surface treatment and the presence of surface functional group. The model given by Perry and Green is employed to fit the experimental data. These experimental data together with the fitted parameters are essential in the design and simulation of adsorption heat Pump systems.
Ja Staubli - One of the best experts on this subject based on the ideXlab platform.
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heat Pump Application in nearly zero energy buildings
Science and Technology for the Built Environment, 2017Co-Authors: Carste Wemhoene, Werne Hassig, Sara Wyss, Ja StaubliAbstract:Annex 40 in the Heat Pumping Technologies (HPT) Technology Collaboration Programme (TCP) of the International Energy Agency entitled “Heat Pump concepts for nearly zero energy buildings” has been accomplished with nine participating countries. The focus of work has been on system assessment of heat Pumps for the Application in nearly zero energy buildings compared to other heat generators and comparison of different heat Pump types, as well as heat Pump developments and field monitoring in nearly zero energy building Application. Besides a short outline of the Annex 40 and the state-of-the-art of nearly zero energy building, the article focuses on results of a field monitoring project in an nearly zero energy building according to the current Swiss definition. The monitored building is one of the first certified nearly zero energy building with office use in Switzerland. Thus, monitoring results of the system performance in order to verify the nearly zero energy balance are of interest, also to evalutate ...
Kutub Uddi - One of the best experts on this subject based on the ideXlab platform.
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specific heat capacities of carbon based adsorbents for adsorption heat Pump Application
Applied Thermal Engineering, 2018Co-Authors: Kyaw Thu, Sourav Mitra, Kutub Uddi, Md Amirul Islam, Jongboong Lee, Idyut Bara SahaAbstract:Abstract Microporous adsorbents have been extensively employed in various sorption cycles. The specific heat capacity of such porous materials is an important parameter in adsorption simulation and system design. This article discusses the experimental evaluation of the specific heat capacities of several carbon-based adsorbents for cooling Applications. The studied adsorbents include (i) parent Maxsorb III with different particle sizes, (ii) surface treated Maxsorb III (H2 and KOH-H2) (iii) recently developed spherical activated carbon (KOH treated phenol resin, KOH6-PR) and (iv) expanded graphite. The specific heat capacity of these materials is measured at temperatures ranging from 30 °C to 150 °C using a heat flux type differential scanning calorimeter (DSC). Within the experimental conditions, no phase transition or thermal anomaly is detected for all the adsorbents. Surface treated adsorbent exhibits higher specific heat capacities whilst KOH treated phenol resin (KOH6-PR) has the lowest value among the studied adsorbents. High specific heat capacities in the surface treated Maxsorb III might be attributed to the effect of surface treatment and the presence of surface functional group. The model given by Perry and Green is employed to fit the experimental data. These experimental data together with the fitted parameters are essential in the design and simulation of adsorption heat Pump systems.
