| 1. |
- Campana, Pietro Elia, et al.
(författare)
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Optimization and assessment of floating and floating-tracking PV systems integrated in on- and off-grid hybrid energy systems
- 2019
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Ingår i: Solar Energy. - : PERGAMON-ELSEVIER SCIENCE LTD. - 0038-092X .- 1471-1257. ; 177, s. 782-795
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Tidskriftsartikel (refereegranskat)abstract
- Considering the targets of Thailand in terms of renewable energy exploitation and decarbonization of the shrimp farming sector, this work evaluates several scenarios for optimal integration of hybrid renewable energy systems into a representative shrimp farm. In particular, floating and floating-tracking PV systems are considered as alternatives for the exploitation of solar energy to meet the shrimp farm electricity demand. By developing a dynamic techno-economic simulation and optimization model, the following renewable energy systems have been evaluated: PV and wind based hybrid energy systems, off-grid and on-grid PV based hybrid energy systems, ground mounted and floating PV based hybrid energy systems, and floating and floating-tracking PV based hybrid energy systems. From a water-energy nexus viewpoint, floating PV systems have shown significant impacts on the reduction of evaporation losses, even if the energy savings for water pumping are moderate due to the low hydraulic head. Nevertheless, the study on the synergies between water for food and power production has highlighted that the integration of floating PV represents a key solution for reducing the environmental impacts of shrimp farming. For the selected location, the results have shown that PV systems represent the best renewable solution to be integrated into a hybrid energy system due to the abundance of solar energy resources as compared to the moderate wind resources. The integration of PV systems in off-grid configurations allows to reach high renewable reliabilities up to 40% by reducing the levelized cost of electricity. Higher renewable reliabilities can only be achieved by integrating energy storage solutions but leading to higher levelized cost of electricity. Although the floating-tracking PV systems show higher investment costs as compared to the reference floating PV systems, both solutions show similar competiveness for reliabilities up to 45% due to the higher electricity production of the floating-tracking PV systems. The higher electricity production from the floating-tracking PV systems leads to a better competitiveness for reliabilities higher than 90% due to lower capacity requirements for the storage systems.
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| 2. |
- Nookuea, Worrada, et al.
(författare)
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Comparison of Mass Transfer Models on Rate-Based Simulation of CO2 Absorption and Desorption Processes
- 2017
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Ingår i: Proceedings of the 9th International Conference on Applied Energy. - : Elsevier. ; 142, s. 3747-3752
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Konferensbidrag (refereegranskat)abstract
- The effective technology for capturing CO2 at the low concentration is chemical absorption, due to the high reactivity between CO2 and aqueous amine solutions. To capture CO2, the process involves complex reactive separations. The accurate calculation of hydrodynamic properties, and mass and energy transfer are of importance for the design of the absorber and desorber columns. This paper performs the rate-based simulations of CO2 absorption by Monoethanolamine in Aspen Plus. In the calculation of the mass transfer coefficients, different mass transfer models were implemented. In comparison with the desorber, the impacts of mass transfer models were more significant in the simulation of the absorber. For both columns, the impacts of the mass transfer models on the concentration profiles were more significant than those on the temperature profiles. For the absorber, the maximum deviations occur at the bottom of the column for both the concentration and the temperature profiles. Different from the absorber, for the desorber, the maximum deviations occur close to the top of the column.
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| 3. |
- Nookuea, Worrada, 1985-, et al.
(författare)
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Evaluation of Solar PV and Wind Alternatives for Self Renewable Energy Supply : Case Study of Shrimp Cultivation
- 2016
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Ingår i: CUE 2015 - APPLIED ENERGY SYMPOSIUM AND SUMMIT 2015. - Elsevier : Elsevier. ; , s. 462-469
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Konferensbidrag (refereegranskat)abstract
- The challenges in shrimp cultivation are the intensive electricity consumptions with associated greenhouse gases emissions, security of power supply, and environmental impact from the discharged waste water. Following Thailand energy roadmap, the renewable energy share in power production sector is targeted to be increased, for energy security and climate change mitigation. This paper evaluates six different scenarios of renewable energy implementation for shrimp farm in Thailand. The results show that the system with solar PV has higher reliability compared to the one with wind turbine at equal life cycle cost. The reliability of the system with solar PV and solar PV with battery varies significantly with the life cycle cost at low cost range then becomes stable. On the other hand, it was found to be quite stable in the cases of wind turbine with and without battery. Adding battery to the system significantly increases the reliability of solar PV and slightly increases for wind turbine. At the life cycle cost lower than $1 million, maximum reliability of the system with solar PV is around 53%. By adding battery, the reliability of the system can be up to 90%. The different magnitudes of the reliability between these two scenarios are higher at higher life cycle cost. For this case study, to reach higher than 50% reliability, the recommended renewable alternative is solar PV with battery.
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| 4. |
- Nookuea, Worrada, et al.
(författare)
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Impacts of thermo-physical properties of gas and liquid phases on design of absorber for CO2 capture using monoethanolamine
- 2016
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Ingår i: International Journal of Greenhouse Gas Control. - : Elsevier BV. - 1750-5836 .- 1878-0148. ; 52, s. 190-200
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Tidskriftsartikel (refereegranskat)abstract
- Absorption of CO2 with aqueous amines in post-combustion capture is characterized as a heat and mass transfer processes with chemical reaction, which is sensitively affected by the thermo-physical properties of fluids. In order to optimize the design of the absorber of CO2 capture process, in this paper, the impacts of thermo-physical properties on the column design were investigated. Furthermore, the property impacts on the capital cost of the absorber unit were also identified and analyzed. Results show that the gas phase density has the most significant effect on the column diameter. Underestimation of the gas phase density of 10% may result in an increase of about 6% of the column diameter. For the packing height, the liquid phase density has the most significant effect. 10% underestimation of the liquid phase density may result in an increase of 8% of the packing height. Moreover, the effect from the liquid phase viscosity is also significant. For the annual capital cost, the liquid phase density also shows the most significant effect. Underestimation of the liquid phase density of 10% leads to the cost overestimation of $1.4 million for the absorption column for a 400 MW coal-fired power plant. Therefore, the development of the flue gas density model and liquid phase density and viscosity models of the aqueous amine solution with CO2 loading should be prioritized.
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| 5. |
- Nookuea, Worrada
(författare)
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Impacts of Thermo-Physical Properties on Chemical Absorption for CO2 Capture
- 2016
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Following the climate change mitigation target in Paris agreement, the global warming has to be limited to 2.0°C above the preindustrial levels. One of the potential methods is carbon capture and storage (CCS), which can significantly reduce the CO2 emissions from the vast point sources such as power plants, industries, and natural gas processes. The CCS covers four steps which are capture, conditioning, transport, and storage. For the capture part, post-combustion capture is easier to implement based on today’s technologies and infrastructure compared with pre-combustion and oxy-fuel combustion captures, since the radical changes in the structure of the existing plant are not required.To design and operate different CCS processes, the knowledge of thermo-physical properties of the CO2 mixtures is of importance. In this thesis, the status and progress of the studies related to the impacts of the uncertainty in thermo-physical properties on the design and operation of the CCS processes were reviewed. The knowledge gaps and the priority of property model development were identified.According to the identified knowledge gaps in the review, the impacts of thermo-physical properties which are the density, viscosity, and diffusivity of the gas and liquid phases, and the surface tension and heat capacity of the liquid phase on the design of the absorber column for the chemical absorption using aqueous monoethanolamine were quantitatively analyzed. An in-house rate-based absorption model was developed in MATLAB to simulate the absorption process, and the sensitivity study was done for each property. An economic evaluation was also performed to further estimate the impacts of the properties on the capital cost of the absorption unit. For column diameter of the absorber, the gas phase density shows the most significant impacts; while, the liquid phase density and viscosity show the most significant impacts on the design of the packing height and also the capital cost of the absorption unit. Therefore, developing the flue gas density model and liquid phase density and viscosity models of the aqueous solvents with CO2 loading should be prioritized.
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| 6. |
- Nookuea, Worrada, 1985-, et al.
(författare)
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Impacts of thermo-physical properties on the design and costs of monoethanolamine-based chemical absorption
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The purchasing cost of the desorber column is the second largest equipment cost after that of the absorber column. In this paper we investigate the impacts of thermo-physical properties of gas and liquid phase on the design of the desorber and the annual capital cost of the absorber, desorber, and overall equipment. The results show that for the desorber column diameter, the gas phase density has the most significant impact. Overestimation of the gas phase density of 10% may result in a decrease of 5% of the column diameter. For the packing height, the gas phase diffusivity has the most significant impact. 10% overestimation of the gas phase diffusivity may result in a decrease of 6% of the packing height. For the annual capital cost, the liquid phase density shows the most significant impact on the absorber cost. 10% overestimation of the liquid phase density causes the cost underestimation of 0.19 M€. For the desorber cost, the gas phase density has the most significant impact. 10% overestimation of the gas phase density leads to the underestimation of 0.04 M€. However, for the overall equipment cost, the effect from the liquid phase density is the most significant. 10% overestimation of the liquid phase density causes the underestimation of 0.20 M€. In consideration together with the property model uncertainty ranges, for the desorber cost, development of the gas phase density and diffusivity model of the H2O/CO2 mixture should be prioritized. However, when considering the impact on the absorber cost and the overall equipment cost, development of the density and viscosity models of the aqueous amine solution with CO2 loading should be prioritized.
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| 7. |
- Nookuea, Worrada, 1985-
(författare)
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Impacts of Thermo–Physical Properties on the Design, Operation, and Cost of Monoethanolamine–Based Chemical Absorption
- 2020
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The thermodynamic and transport properties of CO2 mixtures are essential to the design, operation, and optimization of all carbon capture and storage processes. To retrieve accurate property values, accurate property models are required. However, there are many properties, which are in turn affected by many factors. Moreover, property model development is behind the requirement of accurate properties. Therefore, it is important to quantify the property impacts on the process design for CCS to prioritize the development of models of the properties that are the most important ones.According to the identified knowledge gaps, the impacts of the following thermo-physical properties were selected for quantitative analysis: density, viscosity, diffusivity, and surface tension on the column designs for the chemical absorption using aqueous monoethanolamine. The in–house rate–based absorption and desorption models were developed in MATLAB to simulate the processes, and sensitivity studies were done for each property. For the diameter design, developing more accurate gas phase density models should be prioritized. However, developing a more accurate liquid phase density model is also important, due to its significant impact and larger model uncertainty range. For the absorber packing height design, development of the liquid phase density and viscosity models should be prioritized. In addition, for the desorber packing height design, development of the gas phase diffusivity and density model should be prioritized. Regarding the impacts on the cost of the absorber and the overall equipment, development of the density and viscosity models of the aqueous amine solution with CO2 loading should be prioritized. However, as far as desorber cost is concerned, development of the gas phase density and diffusivity model of the CO2/H2O mixture should be prioritized.The rate-based chemical absorption and desorption models were developed in Aspen Plus to evaluate the impacts of mass transfer coefficient models and desorber pressure. The liquid mass transfer coefficient has more significant impacts on the simulation of the absorber than it does to the simulation of the desorber. Moreover, the impacts on the concentration profiles are more significant compared to those on the temperature profiles. In addition, regenerating CO2 at elevated pressures shows the potential to reduce the energy penalty of CO2 capture and compression.
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| 8. |
- Nookuea, Worrada, 1985-, et al.
(författare)
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Regenerating CO2 at High Pressures for Chemical Absorption
- 2018
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Konferensbidrag (refereegranskat)abstract
- Chemical absorption is suitable to capture CO2 from the large point sources with low CO2 concentration such as from the power plant. However, high-energy requirement for solvent regeneration is the main burden to apply this capture technology. Operating the desorber at high pressures has the potential to reduce the energy penalty of CO2 capture and storage since it can reduce the compression work after the desorption. In this work, a rate-based chemical absorption model was developed in Aspen Plus to investigate the impact of operating pressure. After absorption, the solvent pump lifts the pressure of the rich solvent, and CO2 is regenerated at a lifted pressure in the desorber. After condensation and dehydration, the high pressure CO2 is compressed to 110 bar by the two-stage compressor with inter-cooling to 313.15 K for transportation. The results from steady state simulations show that by increasing the desorber pressure, both the required thermal energy of solvent regeneration and the power consumption of compressors decrease, even though the power consumption of pumps and the temperature of solvent regeneration increase. However, from the exergy analyses, the total exergy increases slightly with the desorber pressure.
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| 9. |
- Nookuea, Worrada, et al.
(författare)
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Sensitivity study of thermo-physical properties of gas phase on absorber design for CO2 capture using monoethanolamine
- 2015
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Ingår i: CLEAN, EFFICIENT AND AFFORDABLE ENERGY FOR A SUSTAINABLE FUTURE. - : Elsevier BV. ; 75, s. 2305-2310
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Konferensbidrag (refereegranskat)abstract
- Absorption of CO2 with aqueous amines in post-combustion capture is characterized as mass transfer process with chemical reaction. Hydrodynamics and mass transfer in gas and liquid phases in a packed column have significant influences on absorber design especially for the design of packing height. In this paper, the sensitivity study has been conducted to investigate the impacts of gas phase density, viscosity and diffusivity on the hydrodynamics and mass transfer and further the total packing height of a countercurrent flow with random packing column, using reactive absorption process and integral rate-based models. Results show that density and diffusivity have opposite effect to viscosity. Amongst various properties, diffusivity has the most significant effect on the packing height compared to density and viscosity. Overestimation of diffusivity of 5% may result in decrease of 3.2% of packing height. Moreover, developing more accurate diffusivity model should be prioritized for more accurate absorber design. (C) 2015 The Authors. Published by Elsevier Ltd.
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| 10. |
- Nookuea, Worrada, et al.
(författare)
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Viscosity Data of Aqueous MDEA-[Bmim][BF4] Solutions Within Carbon Capture Operating Conditions
- 2017
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Ingår i: 8th International Conference on Applied Energy, ICAE2016, 8-11 October 2016, Beijing, China. - : Elsevier. ; 105, s. 4581-4586
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Konferensbidrag (refereegranskat)abstract
- Post-combustion capture with chemical absorption shows higher potential for commercial scale application compared with other technologies. To capture CO2 from the industrial and power plant's flue gases, aqueous alkanolamine solutions are widely used. However, several drawbacks from utilizing the aqueous alkanolamines such as MEA still need to be solved. For example, alkanolamine solutions require intensive energy for regeneration and cause severe corrosion to the equipment though they have high reactivity in capturing CO2. Ionic liquids have been of interest in the recent development of chemical absorption according to their unique characteristics including wide liquid range, negligible volatility and thermal stability. However, due to their high price, high viscosity and low absorption capacity compared to alkanolamines, ionic liquids are still non-desirable for industrial applications. One possible solution to improve the performance of ionic liquids is to use mixtures of ionic liquids and alkanolamines. For a better understanding of the absorption using the mixture of aqueous alkanolamines and ionic liquids, the knowledge of thermo-physical properties of the solutions, especially the viscosity and density are of importance. This paper reports the measured viscosity of MDEA-[Bmim][BF4] aqueous mixtures at various temperatures and concentrations. It was found that the viscosity increase with an increase in [Bmim][BF4] concentration, but decrease with an increase in temperature. Moreover, the impact of temperature on the viscosity is more significant at low temperature range.
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