Measurement of water adsorption on aqsoa type zeolites under static and dynamic conditions

There has been an increase in the research of adsorption chillers in recent years due to more emphases of nations in more environmentally friendly and energy saving technologies. The development of adsorption chiller has strong interest as compared to conventional mechanical compression chillers and...

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Main Author: Fung, Xue Feng
Other Authors: Anutosh Chakraborty
Format: Final Year Project
Language:English
Published: 2016
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Online Access:http://hdl.handle.net/10356/67419
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-674192023-03-04T18:15:11Z Measurement of water adsorption on aqsoa type zeolites under static and dynamic conditions Fung, Xue Feng Anutosh Chakraborty School of Mechanical and Aerospace Engineering DRNTU::Engineering There has been an increase in the research of adsorption chillers in recent years due to more emphases of nations in more environmentally friendly and energy saving technologies. The development of adsorption chiller has strong interest as compared to conventional mechanical compression chillers and heat pump as it uses waste heat and does not have environmentally unfriendly chlorofluorocarbons. Recently, there are new adsorbents called AQSOA-Z01 and AQSOA-Z02 zeolites and was developed by Mitsubishi Plastics Inc. The experiments were carried out to understand the behaviour of these two materials under static and dynamic conditions. In order to understand the characteristics and property of both zeolites, N2 adsorption or desorption isotherm using Brunauer-Emmett-Teller (BET) equation and scanning electron microscopy (SEM) are conducted. The amount and rate of uptakes of the adsorbate (water vapour) on the adsorbents (AQSOA-Z01 and AQSOA-Z02) were measured for the temperatures of 298K, 313K and 333K with the pressure ranging from 0.0222kPa to 17.971kPa or relative pressure ranging from 0.1 to 0.9. The adsorption uptakes data were then fitted with isotherm models such as Tóth, Dubinin Astakhov, Modified Langmuir and Chakraborty-Sun isotherm for studying static conditions. AQSOA-Z01 has a unique ‘S’ shaped adsorption isotherm of Type V and AQSOA-Z02 observed to have a Type I isotherm. The ‘S’ shaped represents a hydrophobic behaviour at low pressure. The Modified Langmuir isotherm was identified to fit the data for both AQSOA-Z01 and AQSOA-Z02. The difference between the adsorption and desorption isotherm is called the hysteresis behaviour. Qst was calculated using Clausius Clapeyron relations with experimental data, other Qst derived from these isotherms were also added for comparison. However, none of the derived Qst is able to fit the experimental data for both AQSOA-Z01 and AQSOA-Z02. To understand the behaviour of AQSOA-Z01 and AQSOA-Z02 under dynamic conditions, the kinetic model such as Modified Linear Driving Force model was used. Modified Langmuir was used to for the study of kinetic models and Modified Linear Driving Force model is considered to be a good model as it fits the experimental data for both AQSOA-Z01 and AQSOA-Z02. The data acquired from experiments were plotted against isotherm and kinetic model with margin of error of around 5% for a good fitting. Bachelor of Engineering (Mechanical Engineering) 2016-05-16T07:56:39Z 2016-05-16T07:56:39Z 2016 Final Year Project (FYP) http://hdl.handle.net/10356/67419 en Nanyang Technological University 73 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering
spellingShingle DRNTU::Engineering
Fung, Xue Feng
Measurement of water adsorption on aqsoa type zeolites under static and dynamic conditions
description There has been an increase in the research of adsorption chillers in recent years due to more emphases of nations in more environmentally friendly and energy saving technologies. The development of adsorption chiller has strong interest as compared to conventional mechanical compression chillers and heat pump as it uses waste heat and does not have environmentally unfriendly chlorofluorocarbons. Recently, there are new adsorbents called AQSOA-Z01 and AQSOA-Z02 zeolites and was developed by Mitsubishi Plastics Inc. The experiments were carried out to understand the behaviour of these two materials under static and dynamic conditions. In order to understand the characteristics and property of both zeolites, N2 adsorption or desorption isotherm using Brunauer-Emmett-Teller (BET) equation and scanning electron microscopy (SEM) are conducted. The amount and rate of uptakes of the adsorbate (water vapour) on the adsorbents (AQSOA-Z01 and AQSOA-Z02) were measured for the temperatures of 298K, 313K and 333K with the pressure ranging from 0.0222kPa to 17.971kPa or relative pressure ranging from 0.1 to 0.9. The adsorption uptakes data were then fitted with isotherm models such as Tóth, Dubinin Astakhov, Modified Langmuir and Chakraborty-Sun isotherm for studying static conditions. AQSOA-Z01 has a unique ‘S’ shaped adsorption isotherm of Type V and AQSOA-Z02 observed to have a Type I isotherm. The ‘S’ shaped represents a hydrophobic behaviour at low pressure. The Modified Langmuir isotherm was identified to fit the data for both AQSOA-Z01 and AQSOA-Z02. The difference between the adsorption and desorption isotherm is called the hysteresis behaviour. Qst was calculated using Clausius Clapeyron relations with experimental data, other Qst derived from these isotherms were also added for comparison. However, none of the derived Qst is able to fit the experimental data for both AQSOA-Z01 and AQSOA-Z02. To understand the behaviour of AQSOA-Z01 and AQSOA-Z02 under dynamic conditions, the kinetic model such as Modified Linear Driving Force model was used. Modified Langmuir was used to for the study of kinetic models and Modified Linear Driving Force model is considered to be a good model as it fits the experimental data for both AQSOA-Z01 and AQSOA-Z02. The data acquired from experiments were plotted against isotherm and kinetic model with margin of error of around 5% for a good fitting.
author2 Anutosh Chakraborty
author_facet Anutosh Chakraborty
Fung, Xue Feng
format Final Year Project
author Fung, Xue Feng
author_sort Fung, Xue Feng
title Measurement of water adsorption on aqsoa type zeolites under static and dynamic conditions
title_short Measurement of water adsorption on aqsoa type zeolites under static and dynamic conditions
title_full Measurement of water adsorption on aqsoa type zeolites under static and dynamic conditions
title_fullStr Measurement of water adsorption on aqsoa type zeolites under static and dynamic conditions
title_full_unstemmed Measurement of water adsorption on aqsoa type zeolites under static and dynamic conditions
title_sort measurement of water adsorption on aqsoa type zeolites under static and dynamic conditions
publishDate 2016
url http://hdl.handle.net/10356/67419
_version_ 1759854050612871168