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Author (up) Caceres, G.; Anrique, N.; Girard, A.; Degreve, J.; Baeyens, J.; Zhang, H.L. pdf  doi
openurl 
  Title Performance of molten salt solar power towers in Chile Type
  Year 2013 Publication Journal Of Renewable And Sustainable Energy Abbreviated Journal J. Renew. Sustain. Energy  
  Volume 5 Issue 5 Pages 15 pp  
  Keywords  
  Abstract Chile is facing important challenges to develop its energy sector. Estimations demonstrate that in its electricity consumption Chile will grow at an annual rate of 4.6% until 2030, despite ongoing efficiency improvements. To satisfy this demand in a sustainable way, the national energy policy promotes the integration of novel and clean power generation into the national power mix, with special emphasis on concentrated solar power (CSP). The present paper assesses the development of solar-based electricity generation in Chile by CSP, achieved by a Solar Power Tower plant (SPT) using molten salt as heat carrier and store. Such SPTs can be installed at different locations in Chile, and connected to the main national grid. Results show that each SPT plant can generate around 76 GWh(el) of net electricity, when considering solar irradiation as the sole energy source and at a 16% overall efficiency of the SPT process. For operation in a continuous mode, a hybrid configuration with integrated gas backup system increases the generating potential of each SPT to 135 GWh(el). A preliminary Levelized Energy Cost (LEC) calculation provides LEC values between 0.15 and 0.18 $/kWh, as function of the overall process efficiency and estimated investment cost. Chile's solar irradiation favors the implementation of SPT plants. (C) 2013 AIP Publishing LLC.  
  Address [Caceres, G.; Anrique, N.; Girard, A.] Univ Adolfo Ibanez, Fac Sci & Engn, Santiago, Chile, Email: Zhanghl.lily@gmail.com  
  Corporate Author Thesis  
  Publisher Amer Inst Physics Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1941-7012 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000326641300056 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 325  
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Author (up) Caceres, G.; Nasirov, S.; Zhang, H.L.; Araya-Letelier, G. pdf  doi
openurl 
  Title Residential Solar PV Planning in Santiago, Chile: Incorporating the PM10 Parameter Type
  Year 2015 Publication Sustainability Abbreviated Journal Sustainability  
  Volume 7 Issue 1 Pages 422-440  
  Keywords PV solar panels; efficiency; LCOE; dust; PM10; Santiago; Chile  
  Abstract This paper addresses an economic study of the installation of photovoltaic (PV) solar panels for residential power generation in Santiago, Chile, based on the different parameters of a PV system, such as efficiency. As a performance indicator, the Levelized Cost of Energy (LCOE) was used, which indicates the benefit of the facility vs. the current cost of electrical energy. In addition, due to a high level of airborne dusts typically associated with PM10, the effect of the dust deposition on PV panels' surfaces and the effect on panel performance are examined. Two different scenarios are analyzed: on-grid PV plants and off-grid PV plants.  
  Address [Caceres, Gustavo; Nasirov, Shahriyar; Araya-Letelier, Gerardo] Univ Adolfo Ibanez, Fac Ingn & Ciencias, Santiago 7941169, Chile, Email: gustavo.caceres@uai.cl;  
  Corporate Author Thesis  
  Publisher Mdpi Ag Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2071-1050 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000348399300020 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 451  
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Author (up) Parrado, C.; Caceres, G.; Bize, F.; Bubnovich, V.; Baeyens, J.; Degreve, J.; Zhang, H.L. pdf  doi
openurl 
  Title Thermo-mechanical analysis of copper-encapsulated NaNO3-KNO3 Type
  Year 2015 Publication Chemical Engineering Research & Design Abbreviated Journal Chem. Eng. Res. Des.  
  Volume 93 Issue Pages 224-231  
  Keywords Copper-encapsulation; Nitrate salts; Simulation; Phase change material; Thermal energy storage; Comsol Multiphysics  
  Abstract The present paper presents a numerical study to investigate and assess the heat transfer behavior of a copper and salt composite. A mixture of nitrates, KNO3-NaNO3, within a deformable spherical shell coating of copper will be used as an encapsulated phase change material, E-PCM. In the context of a thermo-mechanical analysis of this E-PCM, a simulation is proposed to determine its storage capacity and properties The melting, or solidification of the encapsulated PCM particles do not provoke cracking of the deformable shell. (C) 2014 The Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.  
  Address [Parrado, C.; Caceres, G.; Bize, F.; Bubnovich, V.] Univ Adolfo Ibanez, Fac Sci & Engn, Santiago, Chile, Email: J.Baeyens@warwick.ac.uk  
  Corporate Author Thesis  
  Publisher Inst Chemical Engineers Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0263-8762 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000348878600021 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 457  
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Author (up) Zhang, H.L.; Baeyens, J.; Caceres, G.; Degreve, J.; Lv, Y.Q. pdf  doi
openurl 
  Title Thermal energy storage: Recent developments and practical aspects Type
  Year 2016 Publication Progress In Energy And Combustion Science Abbreviated Journal Prog. Energy Combust. Sci.  
  Volume 53 Issue Pages 1-40  
  Keywords Thermal energy storage; Sensible; Latent; Thermo-chemical; Encapsulation; Material properties; Improvements; Future R&D  
  Abstract Thermal energy storage (TES) transfers heat to storage media during the charging period, and releases it at a later stage during the discharging step. It can be usefully applied in solar plants, or in industrial processes, such as metallurgical transformations. Sensible, latent and thermo-chemical media store heat in materials which change temperature, phase or chemical composition, respectively. Sensible heat storage is well-documented. Latent heat storage, using phase change materials (PCMs), mainly using liquid solid transition to store latent heat, allows a more compact, efficient and therefore economical system to operate. Thermo-chemical heat storage (TCS) is still at an early stage of laboratory and pilot research despite its attractive application for long term energy storage. The present review will assess previous research, while also adding novel treatments of the subject. TES systems are of growing importance within the energy awareness: TES can reduce the LCOE (levelized cost of electricity) of renewable energy processes, with the temperature of the storage medium being the most important parameter. Sensible heat storage is well-documented in literature and applied at large scale, hence limited in the content of the present review paper. Latent heat storage using PCMs is dealt with, specifically towards high temperature applications, where inorganic substances offer a high potential. Finally, the use of energy storage through reversible chemical reactions (thermo-chemical Storage, TCS) is assessed. Since PCM and TCS storage media need to be contained in a capsule (sphere, tube, sandwich plates) of appropriate materials, potential containment materials are examined. A heat transfer fluid (HTF) is required to convey the heat from capture, to storage and ultimate re-use. Particle suspensions offer a valid alternative to common HTF, and a preliminary assessment confirms the advantages of the upflow bubbling fluidized bed and demonstrates that particulate suspensions enable major savings in investment and operating costs. Novel treatments of the TES subject in the review involve the required encapsulation of the latent and chemical storage media, the novel development of powder circulation loops as heat transfer media, the conductivity enhancement of PCMs, the use of lithium salts, among others. (C) 2015 Elsevier Ltd. All rights reserved.  
  Address [Zhang, Huili; Degreve, Jan] Katholieke Univ Leuven, Dept Chem Engn, Bio & Chem Reactor Engn & Safety Sect, B-3001 Leuven, Belgium, Email: lvyq@mail.buct.edu.cn  
  Corporate Author Thesis  
  Publisher Pergamon-Elsevier Science Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0360-1285 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000369210200001 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 583  
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Author (up) Zhang, H.L.; Baeyens, J.; Degreve, J.; Caceres, G. pdf  doi
openurl 
  Title Concentrated solar power plants: Review and design methodology Type
  Year 2013 Publication Renewable & Sustainable Energy Reviews Abbreviated Journal Renew. Sust. Energ. Rev.  
  Volume 22 Issue Pages 466-481  
  Keywords Concentrated solar power plants; Design methodology; Solar towers; Hourly beam irradiation; Plant simulation  
  Abstract Concentrated solar power plants (CSPs) are gaining increasing interest, mostly as parabolic trough collectors (PTC) or solar tower collectors (STC). Notwithstanding CSP benefits, the daily and monthly variation of the solar irradiation flux is a main drawback. Despite the approximate match between hours of the day where solar radiation and energy demand peak, CSPs experience short term variations on cloudy days and cannot provide energy during night hours unless incorporating thermal energy storage (TES) and/or backup systems (BS) to operate continuously. To determine the optimum design and operation of the CSP throughout the year, whilst defining the required TES and/or BS, an accurate estimation of the daily solar irradiation is needed. Local solar irradiation data are mostly only available as monthly averages, and a predictive conversion into hourly data and direct irradiation is needed to provide a more accurate input into the CSP design. The paper (i) briefly reviews CSP technologies and STC advantages; (ii) presents a methodology to predict hourly beam (direct) irradiation from available monthly averages, based upon combined previous literature findings and available meteorological data; (iii) illustrates predictions for different selected STC locations; and finally (iv) describes the use of the predictions in simulating the required plant configuration of an optimum STC. The methodology and results demonstrate the potential of CSPs in general, whilst also defining the design background of STC plants. (C) 2013 Elsevier Ltd. All rights reserved.  
  Address Katholieke Univ Leuven, Dept Chem Engn, Chem & Biochem Proc Technol & Control Sect, B-3001 Heverlee, Belgium, Email: Zhanghl.lily@gmail.com  
  Corporate Author Thesis  
  Publisher Pergamon-Elsevier Science Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1364-0321 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000319952100040 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 287  
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Author (up) Zhang, H.L.; Baeyens, J.; Degreve, J.; Caceres, G.; Segal, R.; Pitie, F. pdf  doi
openurl 
  Title Latent heat storage with tubular-encapsulated phase change materials (PCMs) Type
  Year 2014 Publication Energy Abbreviated Journal Energy  
  Volume 76 Issue Pages 66-72  
  Keywords Heat storage; Latent heat; Phase change materials; Nitrate-PCM; Tube-encapsulation; Experiments  
  Abstract Heat capture and storage is important in both solar energy projects and in the recovery of waste heat from industrial processes. Whereas heat capture will mostly rely on the use of a heat carrier, the high efficiency heat storage needs to combine sensible and latent heat storage with phase change materials (PCMs) to provide a high energy density storage. The present paper briefly reviews energy developments and storage techniques, with special emphasis on thermal energy storage and the use of PCM. It thereafter illustrates first results obtained when encapsulating NaNO3/KNO3-PCM in an AISI 321 tube, as example of a storage application using a multi-tubular exchanger filled with PCM. To increase the effective thermal conductivity of the PCM, 2 inserts i.e. metallic foam and metallic sponge are also tested. Experimental discharging (cooling) rates are interpreted by both solving the unsteady-state conduction equation, and by using Comsol Multiphysics. Predictions and experimental temperature evolutions are in fair agreement, and the effect of the inserts is clearly reflected by the increased effective thermal conductivity of the insert-PCM composite. Application of Comsol to predict the mechanical behavior of the system, when melting and associated expansion increase the internal pressure, demonstrates that the pressure build-up is far below the Young's modulus of the AISI 321 encapsulation and that this shell will not crack (C) 2014 Elsevier Ltd. All rights reserved.  
  Address [Zhang, H. L.; Degreve, J.] Katholieke Univ Leuven, Dept Chem Engn, Chem & Biochem Proc Technol & Control Sect, B-3001 Heverlee, Belgium, Email: Huili.Zhang@cit.kuleuven.be  
  Corporate Author Thesis  
  Publisher Pergamon-Elsevier Science Ltd Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0360-5442 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000344444600009 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 422  
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Author (up) Zhou, C.C.; Zhang, H.L.; Valdebenito, M.A.; Zhao, H.D. doi  openurl
  Title A general hierarchical ensemble-learning framework for structural reliability analysis Type
  Year 2022 Publication Reliability Engineering & System Safety Abbreviated Journal Reliab. Eng. Syst. Saf.  
  Volume 225 Issue Pages 108605  
  Keywords Reliability analysis; Ensemble-learning; Surrogate model; Performance function; Limit state surface  
  Abstract Existing ensemble-learning methods for reliability analysis are usually developed by combining ensemble learning with a learning function. A commonly used strategy is to construct the initial training set and the test set in advance. The training set is used to train the initial ensemble model, while the test set is adopted to allocate weight factors and check the convergence criterion. Reliability analysis focuses more on the local prediction accuracy near the limit state surface than the global prediction accuracy in the entire space. However, samples in the initial training set and the test set are generally randomly generated, which will result in the learning function failing to find the real ???best??? update samples and the allocation of weight factors may be suboptimal or even unreasonable. These two points have a detrimental impact on the overall performance of the ensemble model. Thus, we propose a general hierarchical ensemble-learning framework (ELF) for reliability analysis, which consists of two-layer models and three different phases. A novel method called CESM-ELF is proposed by embedding the classical ensemble of surrogate models (CESM) in the proposed ELF. Four examples are investigated to show that CESM-ELF outperforms CESM in prediction accuracy and is more efficient in some cases.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0951-8320 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000809659300003 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1597  
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