Study on biomass derived activated carbons for adsorptive heat pump application

Pal, Animesh; Thu, Kyaw; Mitra, Sourav; El-Sharkawy, Ibrahim I.; Saha, Bidyut Baran; Kil, Hyun-Sig; Yoon, Seong Ho; Miyawaki, Jin

doi:10.1016/j.ijheatmasstransfer.2017.02.081

Cited by 93 publications

(17 citation statements)

References 49 publications

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“…The D-A can be described by the Eq.3. This model usually suitable for carbon based adsorbent to explain the heterogeneity of adsorbent 11,23) .…”

Section: Dubinin-astakhov (D-a) Modelmentioning

confidence: 99%

“…The Freundlich equation cannot properly explains the adsorption process at low and high pressure region. However, Tòth equation satisfies both the two end pressure limits and can be written as the following form 11,24) :…”

Section: Tòth Modelmentioning

confidence: 99%

“…Error analysis showed that hybrid fractional error evaluation function and SSE provide the minimum error. Different kinds of isotherm models and error evaluation functions can be found elsewhere 1,3,5,11,12) .…”

Section: Introductionmentioning

confidence: 99%

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Statistical Analysis of Optimized Isotherm Model for Maxsorb III/Ethanol and Silica Gel/Water Pairs

Rahman¹,

Pal²,

Uddin³

et al. 2018

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In this study, five error evaluation functions are used to calculate the error deviation between the experimental data and the predicted data for Maxsorb III/ethanol and RD silica gel/water pairs when the isotherm data fitted with six isotherm models. An error analysis based on the sum of normalized error (SNE) is performed to observe the effect of different error evaluation functions for the determination of isotherm parameters. On the basis of error values, Tòth isotherm provides less error compared to other models for both pairs. Error analysis using SNE advocates that HYBRID error evaluation function is suitable for D-A, Freundlich, and Hill models for both pairs whereas ARED error evaluation function is appropriate for Tòth and Langmuir models for Maxsorb III/ethanol pairs. However, RMSD for Redlich-Peterson and SSE for Tòth are appropriate for Maxsorb III/ethanol and silica gel/water pairs, respectively. Seven statistical tools are employed to predict the best isotherm model for the studied pairs. It is found that, except F-test, all other functions provide agreeable results for the better fitting of Tòth model for Maxsorb III/ethanol pair. More or less, similar findings are observed for the RD silica gel/water pair. Moreover, seven information criteria (IC's) are also performed in order to find the optimum isotherm model. On the basis of IC's, Tòth model provides less information loss compared to other models for the studied pairs.

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“…The D-A can be described by the Eq.3. This model usually suitable for carbon based adsorbent to explain the heterogeneity of adsorbent 11,23) .…”

Section: Dubinin-astakhov (D-a) Modelmentioning

confidence: 99%

Section: Tòth Modelmentioning

confidence: 99%

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Statistical Analysis of Optimized Isotherm Model for Maxsorb III/Ethanol and Silica Gel/Water Pairs

Rahman¹,

Pal²,

Uddin³

et al. 2018

Evergreen

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“…But some constraints such as low coefficient of performance (COP) and specific cooling power (SCP), size of the mass and the volume that is less ergonomic, as well as high initial procurement investment become challenges in implementing this technology on massive scale. Researchers working on this field are also looking for ways to improve the efficiency of their own adsorption cooling technology, such as develop several new refrigerants with high uptake [1][2][3][4], attempt variations in the use of adsorbents [5][6][7][8], improvise heat transfer coefficients [9][10][11], attempt variations of cycle time [12][13], and apply the heat recovery and the mass recovery process [14].…”

Section: Introductionmentioning

confidence: 99%

CFD Simulation of Silica Gel as an Adsorbent on Finned Tube Adsorbent Bed

2018

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The adsorption technology is becoming the more expected solution by today’s researchers for fix the energy and environmental issues. The main part of the cooling system adsorption is adsorbent and adsorbate. One of the most widely used adsorbents in research of adsorption technology is silica gel. A new silica gel-water adsorption chiller design was developed that composed of two sorption chambers with compact fin tube heat exchangers as adsorber, condenser, and evaporator. Energy, mass, and momentum conservation equations of the adsorption systems have been used for the CFD two and three dimensional models. The geometry of simulation is simply made within silica gel layer between two fins. The simulation is also implemented using a finite volume method through the CFD software Fluent. User defined functions are given to modify the energy, mass, and momentum conservation equations. The simulation of adsorption process is adjusted at unsteady condition. Adsorption and desorption processes are simulated with room temperature for cooling water inlet at temperature 305.15 °K, hot water inlet at temperature 353.15 °K, mass flow rate cooling water inlet at 0.3 kg/s and pressure 32 KPa. For the whole adsorbent bed area, the result shows that the highest absolute adsorption rate at the outer surface, while the lowest rate is at the center. After adsorption was finished, the condition is reversed. The highest absolute adsorption rate is achieved at center, while the lowest rate is achieved at the outer surface.

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“…Wang [22] tested a series of composite adsorbents by impregnating CaCl 2 into the pores of silica gel and the test results indicated that both the adsorption amount and adsorption rate of the composite adsorbents increased significantly compared with that of the pure silica gel. Pal [23] employed two biomass sources to synthesize activated carbon by chemical activation with potassium hydroxide (KOH), both biomass-derived ACs showed similar net ethanol uptake which is significantly higher than the net uptake of commercially-prevalent Maxsorb III AC. EI-Sharkawy [24] investigated consolidated composite adsorbents which are combinations of a highly-porous activated carbon powder, expanded graphite, and binder.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of Composite Adsorbent 13X/CaCl2 on an Adsorption Cooling System

et al. 2017

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Featured Application: The study is mainly used in areas where water is scarce, adsorbents adsorb water from the air, and are then desorbed.Abstract: A new experimental device which tests the adsorption performance of the 13X/CaCl 2 composite adsorbent under vacuum conditions was established. In this device, heat transfer characteristics in the adsorbent bed have a great influence on the adsorbent performance, the temperature of the bottom outside bed is very close to the temperature of the bottom inside bed and the temperature difference between them at the end of heating and cooling are 5.66 • C and 0.303 • C, respectively. The following conclusions could be drawn: the equilibrium water uptake of composite adsorbent CA10X (zeolite 13X impregnated with 10 wt % CaCl 2 solution) was increased 5.7% compared with that of 13X, and the water uptake was 0.37 g/g. The composite adsorbent CA10X has a better performance in the adsorption refrigeration system.

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Study on biomass derived activated carbons for adsorptive heat pump application

Cited by 93 publications

References 49 publications

Statistical Analysis of Optimized Isotherm Model for Maxsorb III/Ethanol and Silica Gel/Water Pairs

Statistical Analysis of Optimized Isotherm Model for Maxsorb III/Ethanol and Silica Gel/Water Pairs

CFD Simulation of Silica Gel as an Adsorbent on Finned Tube Adsorbent Bed

Experimental Investigations of Composite Adsorbent 13X/CaCl2 on an Adsorption Cooling System

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