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Bian, X., Liu, L. & Yan, J. (2019). A model for state-of-health estimation of lithium ion batteries based on charging profiles. Energy, 177, 57-65
Open this publication in new window or tab >>A model for state-of-health estimation of lithium ion batteries based on charging profiles
2019 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 177, p. 57-65Article in journal (Refereed) Published
Abstract [en]

Using an equivalent circuit model to characterize the constant-current part of a charging/discharging profile, a model is developed to estimate the state-of-health of lithium ion batteries. The model is an incremental capacity analysis-based model, which applies a capacity model to define the dependence of the state of charge on the open circuit voltage as the battery ages. It can be learning-free, with the parameters subject to certain constraints, and is able to give efficient and reliable estimates of the state-of-health for various lithium ion batteries at any aging status. When applied to a fresh LiFePO 4 cell, the state-of-health estimated by this model (learning-unrequired or learning-required)shows a close correspondence to the available measured data, with an absolute difference of 0.31% or 0.12% at most, even for significant temperature fluctuation. In addition, NASA battery datasets are employed to demonstrate the versatility and applicability of the model to different chemistries and cell designs.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Equivalent circuit model, Incremental capacity analysis, Lithium ion battery, State of health
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-252451 (URN)10.1016/j.energy.2019.04.070 (DOI)000471360100005 ()2-s2.0-85064732053 (Scopus ID)
Note

QC 20190715

Available from: 2019-07-15 Created: 2019-07-15 Last updated: 2019-07-29Bibliographically approved
Shahkarami, P., Neretnieks, I., Moreno, L. & Liu, L. (2019). Channel network concept: an integrated approach to visualize solute transport in fractured rocks. Hydrogeology Journal, 27(1), 101-119
Open this publication in new window or tab >>Channel network concept: an integrated approach to visualize solute transport in fractured rocks
2019 (English)In: Hydrogeology Journal, ISSN 1431-2174, E-ISSN 1435-0157, Vol. 27, no 1, p. 101-119Article in journal (Refereed) Published
Abstract [en]

The advection-dispersion equation, ADE, has commonly been used to describe solute transport in fractured rock. However, there is one key question that must be addressed before the mathematical form of the so-called Fickian dispersion that underlies the ADE takes on physical meaning in fractures. What is the required travel distance, or travel time, before the Fickian condition is met and the ADE becomes physically reasonable? A simple theory is presented to address this question in tapered channels. It is shown that spreading of solute under forced-gradient flow conditions is mostly dominated by advective mechanisms. Nevertheless, the ADE might be valid under natural flow conditions. Furthermore, several concerns are raised in this paper with regard to using the concept of a field-scale matrix diffusion coefficient in fractured rocks. The concerns are mainly directed toward uncertainties and potential bias involved in finding the continuum model parameters. It is illustrated that good curve fitting does not ensure the physical reasonability of the model parameters. It is suggested that it is feasible and adequate to describe flow and transport in fractured rocks as taking place in three-dimensional networks of channels, as embodied in the channel network concept. It is argued that this conceptualization provides a convenient framework to capture the impacts of spatial heterogeneities in fractured rocks and can accommodate the physical mechanisms underlying the behavior of solute transport in fractures. All these issues are discussed in relation to analyzing and predicting actual tracer tests in fractured crystalline rocks.

Place, publisher, year, edition, pages
Springer, 2019
Keywords
Solute transport, Channel network concept, Non-Fickian behavior, Advection-dispersion equation, Matrix diffusion
National Category
Geophysical Engineering
Identifiers
urn:nbn:se:kth:diva-245940 (URN)10.1007/s10040-018-1855-6 (DOI)000458520300007 ()2-s2.0-85053217977 (Scopus ID)
Note

QC 20190308

Available from: 2019-03-08 Created: 2019-03-08 Last updated: 2019-03-18Bibliographically approved
Zhao, R., Liu, L., Zhao, L., Deng, S., Li, S., Zhang, Y. & Li, H. (2019). Techno-economic analysis of carbon capture from a coal-fired power plant integrating solar-assisted pressure-temperature swing adsorption (PTSA). Journal of Cleaner Production, 214, 440-451
Open this publication in new window or tab >>Techno-economic analysis of carbon capture from a coal-fired power plant integrating solar-assisted pressure-temperature swing adsorption (PTSA)
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2019 (English)In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 214, p. 440-451Article in journal (Refereed) Published
Abstract [en]

This paper presents a techno-economic study to seek the feasibility about the proposed system that integrating solar-assisted pressure-temperature swing adsorption (PTSA) into an 800MWe coal-fired power plant. Solar energy has the potential to supply thermal energy demand for carbon capture, which can avoid the energy consumption of the traditional method such as the steam extraction. The performance of the proposed system is largely affected by the climatic conditions and solar collector's types. The assessment criteria include carbon emission intensity (CEO, levelized cost of electricity (LCOE) and cost of CO2 avoidance (COA). By the parametric analysis, the results show that CEI of the novel system with solar thermal collectors is approximately 2g/kWh lower than that of the referenced power plant with CO2 adsorption capture. In addition, CEI of the novel system can be further decrease with the decline of desorption temperature, adsorption pressure and desorption pressure. For the sake of lower LCOE and COA, the prices of the power plant capacity, adsorbents and solar collectors should be reduced. Specifically, LCOE of the system with evacuated tube collector will be lower than that of the reference system with CO2 capture as the price of solar field is lower than 46.08 USD/m2.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD, 2019
Keywords
PTSA, CO2 capture, Solar thermal energy, Techno-economic study
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-245128 (URN)10.1016/j.jclepro.2018.12.316 (DOI)000458228300041 ()2-s2.0-85060041185 (Scopus ID)
Note

QC 20190315

Available from: 2019-03-15 Created: 2019-03-15 Last updated: 2019-06-11Bibliographically approved
Zhao, R., Liu, L., Zhao, L., Deng, S., Li, S., Zhang, Y. & Li, H. (2019). Thermodynamic exploration of temperature vacuum swing adsorption for direct air capture of carbon dioxide in buildings. Energy Conversion and Management, 183, 418-426
Open this publication in new window or tab >>Thermodynamic exploration of temperature vacuum swing adsorption for direct air capture of carbon dioxide in buildings
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2019 (English)In: Energy Conversion and Management, ISSN 0196-8904, E-ISSN 1879-2227, Vol. 183, p. 418-426Article in journal (Refereed) Published
Abstract [en]

Abrupt climate change such as the loss of Arctic sea-ice area urgently needs negative emissions technologies. The potential application of direct air capture of carbon dioxide from indoor air and outdoor air in closed buildings or crowded places has been discussed in this paper. From the aspects of carbon reduction and indoor comfort, the ventilation system integrating a capture device is of great value in practical use. For ultra-dilute carbon dioxide sources, many traditional separation processes have no cost advantages, but adsorption technologies such as temperature vacuum swing adsorption is one of suitable methods. Thermodynamic exploration has been investigated regarding minimum separation work and second-law efficiency at various concentrations in the air. The influence of concentration, adsorption temperature, desorption temperature and desorption pressure on the energy efficiency has also been evaluated. Results show that the minimum separation work for the level of 400 ppm is approximately 20 kJ/mol. The optimal second-law efficiencies are 44.57%, 37.55% and 31.60%, respectively for 3000 ppm, 2000 ppm and 1000 ppm. It means that a high energy-efficiency capture device in buildings merits attention in the exploration of the possibility of approaching negative carbon buildings.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2019
Keywords
Thermodynamics, Second-law efficiency, NETs, Direct air capture, TVSA, Buildings
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-246239 (URN)10.1016/j.enconman.2019.01.009 (DOI)000459837600034 ()2-s2.0-85060286434 (Scopus ID)
Note

QC 20190403

Available from: 2019-04-03 Created: 2019-04-03 Last updated: 2019-04-04Bibliographically approved
Meng, S., Liu, L., Mahmoudzadeh, B., Neretnieks, I. & Moreno, L. (2018). Solute transport along a single fracture with a finite extent of matrix: A new simple solution and temporal moment analysis. Journal of Hydrology, 562, 290-304
Open this publication in new window or tab >>Solute transport along a single fracture with a finite extent of matrix: A new simple solution and temporal moment analysis
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2018 (English)In: Journal of Hydrology, ISSN 0022-1694, E-ISSN 1879-2707, Vol. 562, p. 290-304Article in journal (Refereed) Published
Abstract [en]

A new simple and robust solution, based on uniform steady-state flow velocity, is developed for the problem of solute transport in a fracture-matrix system with a finite penetration depth of a radioactive contaminant into the rock matrix. The solution is an extension of Liu et al. (2017) to finite penetration depth and an alternative solution strategy to the problem solved by Sudicky et al. (1982). The solution takes the form of a convolution of two functions. The first function describes the probability density function of the residence time distribution of a conservative solute resulting merely from advection and Fickian dispersion. The second function is actually the impulse response of the fracture-matrix system in the case of a plug flow without any hydrodynamic dispersion. As a result, the effects of Fickian dispersion and matrix diffusion on solute transport are decoupled, and thus the resulting breakthrough curve can be analyzed in terms of those two functions. In addition to this, the derived Péclet numbers of those two functions, based on temporal moments, are also found to be associated with the derived Péclet number of the resulting breakthrough curve. By comparing the Péclet numbers of those two functions, the contribution of Fickian dispersion and matrix diffusion to solute spreading is determined in a straightforward way. This can aid to find out the dominating mechanism on solute transport, and therefore the performance of breakthrough curve.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Dispersion, Fractured rocks, Matrix diffusion, Péclet number, Solute transport model, Temporal moment analysis
National Category
Oceanography, Hydrology and Water Resources
Identifiers
urn:nbn:se:kth:diva-228725 (URN)10.1016/j.jhydrol.2018.05.016 (DOI)000438003000022 ()2-s2.0-85047099016 (Scopus ID)
Funder
Swedish Nuclear Fuel and Waste Management Company, SKB
Note

QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-07-27Bibliographically approved
Zhao, R., Liu, L., Zhao, L., Deng, S. & Li, H. (2018). Thermodynamic analysis on carbon dioxide capture by Electric Swing Adsorption (ESA) technology. Journal of CO2 Utilization, 26, 388-396
Open this publication in new window or tab >>Thermodynamic analysis on carbon dioxide capture by Electric Swing Adsorption (ESA) technology
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2018 (English)In: Journal of CO2 Utilization, ISSN 2212-9820, E-ISSN 2212-9839, Vol. 26, p. 388-396Article in journal (Refereed) Published
Abstract [en]

This study explores the impacts of materials, such as adsorbents and electrodes, on the energy efficiency of a 4-step ESA cycle for CO2 capture. Three types of adsorbents including activated carbon honeycomb monolith (ACHM) and two hybrid adsorbents are compared, and two kinds of electrodes such as aluminum and brass are combined for comparative analysis. Process description of ESA cycle, including feed, electrification, electrification with purge and cooling, is presented via the adsorption isotherm diagram. By the theory of thermodynamic carbon pump, sensitivity analysis of cycle parameters is evaluated in terms of the second-law efficiency (Eff(2nd)) and the electrical heating efficiency (Eff(ele)). The results show that Eff(2nd) of the employed adsorbents is in the range of 1.17%-6.15%, and Effele of the selected electrodes is between 27.46% and 60.91%. Among the three adsorbents, Eff(2nd) of ACHM is the lowest one compared to the others. Similarly, Effele of the combination with brass is superior to that of the groups with aluminum. However, the actual efficiency of ESA cycle is the production of both Eff(2nd) and Eff(ele), which is approximately 1.03%-3.66%. Typical measures are proposed to reduce the heat loss of the adsorbents and electrodes as well for future work.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Electric swing adsorption, Adsorbents, Electrodes, Energy efficiency, CO(2)capture
National Category
Energy Systems
Identifiers
urn:nbn:se:kth:diva-232778 (URN)10.1016/j.jcou.2018.05.026 (DOI)000439069700040 ()2-s2.0-85047772460 (Scopus ID)
Note

QC 20180807

Available from: 2018-08-07 Created: 2018-08-07 Last updated: 2018-08-07Bibliographically approved
Liu, L., Neretnieks, I., Shahkarami, P., Meng, S. & Moreno, L. (2017). Solute transport along a single fracture in a porous rock: a simple analytical solution and its extension for modeling velocity dispersion. Hydrogeology Journal
Open this publication in new window or tab >>Solute transport along a single fracture in a porous rock: a simple analytical solution and its extension for modeling velocity dispersion
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2017 (English)In: Hydrogeology Journal, ISSN 1431-2174, E-ISSN 1435-0157Article in journal (Refereed) Published
Abstract [en]

A simple and robust solution is developed for the problem of solute transport along a single fracture in a porous rock. The solution is referred to as the solution to the single-flow-path model and takes the form of a convolution of two functions. The first function is the probability density function of residence-time distribution of a conservative solute in the fracture-only system as if the rock matrix is impermeable. The second function is the response of the fracture-matrix system to the input source when Fickian-type dispersion is completely neglected; thus, the effects of Fickian-type dispersion and matrix diffusion have been decoupled. It is also found that the solution can be understood in a way in line with the concept of velocity dispersion in fractured rocks. The solution is therefore extended into more general cases to also account for velocity variation between the channels. This leads to a development of the multi-channel model followed by detailed statistical descriptions of channel properties and sensitivity analysis of the model upon changes in the model key parameters. The simulation results obtained by the multi-channel model in this study fairly well agree with what is often observed in field experiments—i.e. the unchanged Peclet number with distance, which cannot be predicted by the classical advection-dispersion equation. In light of the findings from the aforementioned analysis, it is suggested that forced-gradient experiments can result in considerably different estimates of dispersivity compared to what can be found in natural-gradient systems for typical channel widths.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2017
Keywords
Fractured rocks - Velocity dispersion - Mathematical model - Matrix diffusion - Taylor dispersion
National Category
Other Chemical Engineering Chemical Process Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-213979 (URN)10.1007/s10040-017-1627-8 (DOI)000423051600020 ()2-s2.0-85026908664 (Scopus ID)
Note

QC 20170918

Available from: 2017-09-07 Created: 2017-09-07 Last updated: 2018-02-02Bibliographically approved
Shahkarami, P., Liu, L., Moreno, L. & Neretnieks, I. (2016). The effect of stagnant water zones on retarding radionuclide transport in fractured rocks: An extension to the Channel Network Model. Journal of Hydrology, 540, 1122-1135
Open this publication in new window or tab >>The effect of stagnant water zones on retarding radionuclide transport in fractured rocks: An extension to the Channel Network Model
2016 (English)In: Journal of Hydrology, ISSN 0022-1694, E-ISSN 1879-2707, Vol. 540, p. 1122-1135Article in journal (Refereed) Published
Abstract [en]

An essential task of performance assessment of radioactive waste repositories is to predict radionuclide release into the environment. For such a quantitative assessment, the Channel Network Model and the corresponding computer program, CHAN3D, have been used to simulate radionuclide transport in crystalline bedrocks. Recent studies suggest, however, that the model may tend to underestimate the rock retarding capability, because it ignores the presence of stagnant water zones, STWZs, situated in the fracture plane. Once considered, the STWZ can provide additional surface area over which radionuclides diffuse into the rock matrix and thereby contribute to their retardation.

The main objective of this paper is to extend the Channel Network Model and its computer implementation to account for diffusion into STWZs and their adjacent rock matrices.

In the first part of the paper, the overall impact of STWZs in retarding radionuclide transport is investigated through a deterministic calculation of far-field releases at Forsmark, Sweden. Over the time-scale of the repository safety assessments, radionuclide breakthrough curves are calculated for increasing STWZ width. It is shown that the presence of STWZs enhances the retardation of most long-lived radionuclides except for 36Cl and 129I.

The rest of the paper is devoted to the probabilistic calculation of radionuclide transport in fractured rocks. The model that is developed for transport through a single channel is embedded into the Channel Network Model and new computer codes are provided for the CHAN3D. The program is used to (I) simulate the tracer test experiment performed at Äspö HRL, STT-1 and (II) investigate the short- and long-term effect of diffusion into STWZs. The required data for the model are obtained from detailed hydraulic tests in boreholes intersecting the rock mass where the tracer tests were made.

The simulation results fairly well predict the release of the sorbing tracer 137Cs. It is found that over the short time-scale of the tracer experiment, the effect of diffusion into STWZs is not as pronounced as that of matrix diffusion directly from the flow channel, and the latter remains the main retarding mechanism. Predictions for longer time-scale, tens of years and more, show that the effect of STWZs becomes strong and tends to increase with transport time. It is shown that over the long times of interest for safety assessment of radioactive waste repositories, STWZs can substantially contribute to radionuclide retardation, though for the short time-scales the impact is not very strong and is not expected to affect the results of short-term field experiments.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
Channel Network Model, Stagnant water zones, Matrix diffusion, Radionuclide transport, CHAN3D program, Fractured rocks
National Category
Chemical Process Engineering Other Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-213978 (URN)10.1016/j.jhydrol.2016.07.031 (DOI)000382269500088 ()2-s2.0-84979030705 (Scopus ID)
Note

QC 20170926

Available from: 2017-09-07 Created: 2017-09-07 Last updated: 2019-09-04Bibliographically approved
Larsson, M., Yan, J., Forsberg, K. & Liu, L. (2015). Storm water issues in biomass-fired combined heat and power plants. In: : . Paper presented at XVth World Water Congress, International Water Resources Association (IWRA), Edinburgh, Scotland, 25- 29 May 2015.
Open this publication in new window or tab >>Storm water issues in biomass-fired combined heat and power plants
2015 (English)Conference paper, Poster (with or without abstract) (Refereed)
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-237430 (URN)
Conference
XVth World Water Congress, International Water Resources Association (IWRA), Edinburgh, Scotland, 25- 29 May 2015
Note

QR 20181206 - hittar ej konferensbidraget

Available from: 2018-10-27 Created: 2018-10-27 Last updated: 2018-12-06Bibliographically approved
Liu, L. (2010). Permeability and expansibility of sodium bentonite in dilute solutions (vol 358, pg 68, 2010). Colloids and Surfaces A: Physicochemical and Engineering Aspects, 370(1-3), 143-143
Open this publication in new window or tab >>Permeability and expansibility of sodium bentonite in dilute solutions (vol 358, pg 68, 2010)
2010 (English)In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 370, no 1-3, p. 143-143Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Royal Inst Technol, Dept Chem Engn & Technol, S-10044 Stockholm, Sweden.: ELSEVIER SCIENCE BV, 2010
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-242786 (URN)10.1016/j.colsurfa.2010.08.026 (DOI)000283908300020 ()2-s2.0-77957751708 (Scopus ID)
Note

QC 20190221

Available from: 2019-02-21 Created: 2019-02-21 Last updated: 2019-02-21Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-6801-9208

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