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Efficiency limits of concentrating spectral-splitting hybrid photovoltaic-thermal(PV-T)solar collectors and systems

Light(Science & Applications) 2021年第2期10卷 264-277页

作者： Gan Huang Kai Wang christos n.markides Clean Energy Processes(CEP)Laboratory Department of Chemical EngineeringImperial College LondonLondon SW72AZUK Institute of Refrigeration and Cryogenics Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China

Spectral splitting is an approach to the design of hybrid photovoltaic-thermal(PVT)collectors that promises significant performance ***,the ultimate efficiency limits,optimal PV cell materials and optical filters of spectral-splitting PVT(SSPVT)collectors remain unclear,with a lack of consensus in the *** develop an idealized model of SSPVT collectors and use this to determine their electrical and thermal efficiency limits,and to uncover how these limits can be approached through the selection of optimal PV cell materials and spectral-splitting *** that thermal losses can be minimized,the efficiency limit,optimal PV material and optimal filter all depend strongly on a coefficient w,which quantifies the value of the delivered thermal energy relative to that of the generated *** total(electrical plus thermal)efficiency limit of SSPVT collectors increases at higher w and at higher optical *** optimal spectral-splitting filter is defined by sharp lower-and upper-bound energies;the former always coincides with the bandgap of the cell,whereas the latter decreases at higher *** total effective efficiency limit of SSPVT collectors is over 20%higher than those of either standalone PV modules or standalone ST collectors when w is in the range from 0.35 to 0.50 and up to 30%higher at w~*** study provides a method for identifying the efficiency limits of ideal SSPVT collectors and reports these limits,along with guidance for selecting optimal PV materials and spectral-splitting filters under different conditions and in different applications.

关键词： splitting thermal optimal

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Thermal Energy Storage Contribution to the Economic Dispatch of Island Power Systems

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CSEE Journal of Power and Energy Systems 2020年第1期6卷 100-110页

作者： Panagiotis Romanos Emmanouil Voumvoulakis christos n.markides nikos Hatziargyriou School of Electrical and Computer Engineering National Technical University of Athens(NTUA)Zografou 15780Greece Hellenic Electricity Distri-bution network Operator S.A.(HEDnO) Athens 11743Greece Clean Energy Processes(CEP)Laboratory Depart-ment of Chemical EngineeringImperial College LondonLondon SW72AZU.K.

In this paper the provision of flexible generation is investigated by extracting steam from Rankine-cycle power stations during off-peak demand in order to charge thermal tanks that contain suitable phase-change materials(PCMs);at a later time when this is required and/or is economically effective,these thermal energy storage(TES)tanks can act as the heat sources of secondary thermal power plants in order to generate power,for example as evaporators of,e.g.,organic Rankine cycle(ORC)plants that are suitable for power generation at reduced temperatures and smaller *** type of solution offers greater flexibility than TES-only technologies that store thermal energy and release it back to the base power station,since it allows both derating but also over-generation compared to the base power-station *** solution is applied in a case study of a 50-MW rated oil-fired power station unit at the autonomous system of *** optimal operation of the TES system is investigated,by solving a modified Unit Commitment-Economic Dispatch optimization problem,which includes the TES operating *** results indicate that for most of the scenarios the discounted payback period is lower than 12 years,while in few cases the payback period is 5 years.

关键词： Economic dispatch energy-management energy storage flexibleenergysystem flexiblegeneration generation integrated energystorage phasechangematerials smartgrids

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Challenges and opportunities for nanomaterials in spectral splitting for high-performance hybrid solar photovoltaic-thermal applications:A review

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nano Materials Science 2020年第3期2卷 183-203页

作者： Gan Huang Sara Riera Curt Kai Wang christos n.markides Clean Energy Processes(CEP)Laboratory Department of Chemical EngineeringImperial College LondonSouth Kensington CampusLondon SW72AZUnited Kingdom Institute of Refrigeration and Cryogenics Zhejiang UniversityHangzhou310027China

Hybrid photovoltaic-thermal(PV-T)collectors,which are capable of cogenerating useful thermal energy and electricity from the same aperture area,have a significantly higher overall efficiency and ability to displace emissions compared to independent,separate photovoltaic panels,solar thermal collectors or combinations *** splitting has emerged as a promising route towards next-generation high-performance PV-T collectors,and nanotechnology plays an important role in meeting the optical and thermal requirements of advanced spectral splitting PV-T collector *** paper presents a comprehensive review of spectral splitting technologies based on nanomaterials for PV-T *** nanomaterials(nanofluids,nanofilms and nanowires)suitable for achieving spectral splitting based on reflection,diffraction,refraction and/or absorption approaches in PV-T collectors are presented,along with the associated challenges and opportunities of these design *** requirements from such materials in terms of optical properties,thermal properties,stability and cost are discussed with the aim of guiding future research and innovation,and developing this technology towards practical *** and nanofilms are currently the most common nanomaterials used for spectral splitting,with significant progress made in recent years in the development of these ***,there still remains a considerable gap between the optical properties of currently-available filters and the desired properties of ideal *** to instruct and guide the future development of filter materials,a simple generalized method is further proposed in this paper to identify optimal filters and efficiency limits of spectral splitting PV-T systems for different *** is found that the optimal filter of a spectral splitting PV-T system is highly sensitive to the value of thermal energy relative to that of electricity,which therefore depends strongly on

关键词： thermal splitting performance

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基于跨临界循环的卡诺电池储能系统构型优化

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工程热物理学报 2021年第7期42卷 1659-1666页

作者：赵永亮王朝阳刘明种道彤 christos n.markides 严俊杰西安交通大学动力工程多相流国家重点实验室西安710049 帝国理工学院化学工程系清洁能源过程实验室伦敦SW72AZ

卡诺电池是一种新兴有前景可实现大规模储能的技术。本文基于跨临界CO2循环的卡诺电池储能系统,首先根据储热介质和有无回热情况,设计了 6种系统构型,并对其热力参数进行优化;之后,从热-经济学的角度开展了对比分析,获得了最优系统构型... 详细信息

卡诺电池是一种新兴有前景可实现大规模储能的技术。本文基于跨临界CO2循环的卡诺电池储能系统,首先根据储热介质和有无回热情况,设计了 6种系统构型,并对其热力参数进行优化;之后,从热-经济学的角度开展了对比分析,获得了最优系统构型。结果表明:带回热后的卡诺电池系统比无回热系统综合效率有所提高;其中使用菜籽油时获得最高综合效率(75.28%)和储能密度(36.61 kWh·m^(-3)),且比无回热的系统分别增大了 36.67%和25.68 kWh·m^(-3)。6种卡诺电池系统构型的总投资成本在(11.5~36.3)×10^(6) USD,单位能量的投资成本在954~3028 ***^(-1)·h^(-1);换热器成本占比最高可达54%,储热罐的成本占比最高可达14%,膨胀机和压缩机成本占比分别在18%~31%和14%~26%之间;对比来看,使用导热油并加入回热的卡诺电池系统经济性最好。

关键词：卡诺电池显热储能 PTES 跨临界CO_(2)循环热-经济性分析

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Integrated optimisation of photovoltaic and battery storage systems for UK commercial buildings

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建筑节能(中英文) 2017年第8期 136-136页

作者： Arthur Mariaud Salvador Acha ned Ekins-Daukes nilay Shah christos n.markides 侯恩哲《建筑节能》杂志社

Decarbonising the built environment cost-effectively is a complex challenge public and private organisations are facing in their effort to tackle climate *** this context,this work presents an integrated Technology Selection and Operation(TSO)optimisation model for distributed energy systems in commercial *** purpose of the model is to simultaneously optimise the selection,capacity and operation of photovoltaic(PV)and battery systems;serving as a decision support framework for assessing technology investments.A steady-state mixed-integer linear programming(MILP)approach is employed to formulate the optimisation *** virtue of the TSO model comes from employing granular state-of-the-art datasets such as half-hourly electricity demands and prices,irradiance levels from weather stations,and technology databases;while also considering building specific *** revenues are obtained from reducing grid electricity costs and providing fast-frequency response(FFR)ancillary services.A case study of a distribution centre in London,UK is showcased with the goal to identify which technologies can minimise total energy costs against a conventional system setup serving as a *** indicate the best technology configuration is a combination of lithium-ion batteries and mono-crystalline silicon PVs worth a total investment of ￡1.72 *** to the available space in the facility,the preferred PV capacity is 1.76 MW,while the battery system has a 1.06 MW power capacity and a 1.56 MWh energy *** PV performance varies across seasons,the solution indicates almost 30%of the energy used on-site can be supplied by PVs while achieving a carbon reduction of 26%.nonetheless,PV and battery systems seem to be a questionable investment as the proposed solution has an 8-year payback,despite a 5-year nPV savings of ￡300k,implying there is still a performance gap for such systems to be massively deployed across the ***,the TSO model

关键词： Photovoltaics Battery storage Optimization Distributed energy systems Commercial buildings MILP

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一种应用于冬奥会中的低碳CO_(2)冰场技术

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Science Bulletin 2023年第23期68卷 2877-2880页

作者：李力耕刘楷田华蔡金文 christos n.markides 王竞宇石凌峰王轩马一太梁兴雨舒歌群 State Key Laboratory of Engines Tianjin University AST Refrigeration and Solar Technology(Beijing)Co. Ltd. Department of Chemical Engineering Imperial College London Department of Thermal Science and Energy Engineering University of Science and Technology of China

The issue of climate change is among the most difficult environmental problems faced by human beings[1]and affects all social aspects of human *** 2015,the Paris Agreement set the goal of reducing global greenhouse ga... 详细信息

关键词：冬奥会 limit greenhouse

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Growth performance,welfare traits and meat characteristics of broilers fed diets partly replaced with whole Tenebrio molitor larvae

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Animal nutrition 2023年第2期13卷 90-100页

作者： Stylianos Vasilopoulos Ilias Giannenas Soumela Savvidou Eleftherios Bonos christos I.Rumbos Elias Papadopoulos Paschalis Fortomaris christos G.Athanassiou Laboratory of nutrition Faculty of Veterinary MedicineAristotle University of Thessaloniki54124 ThessalonikiGreece Institute of Animal Science Hellenic Agricultural Organisation-DEMETERParalimni Giannitsa58100Greece Laboratory of Animal Science Nutrition and BiotechnologyDepartment of AgricultureSchool of AgricultureUniversity of IoanninaKostakioi Artas47100ArtaGreece Laboratory of Entomology and Agricultural Zoology Department of AgricultureCrop Production and Rural EnvironmentUniversity of ThessalyPhytokou str.38446N.IoniaVolosGreece Laboratory of Parasitology and Parasitic Diseases Faculty of Veterinary MedicineAristotle University of Thessaloniki54124ThessalonikiGreece Laboratory of Animal Husbandry Faculty of Veterinary MedicineAristotle University of Thessaloniki54124ThessalonikiGreece

The role of insects in animal nutrition has been reconsidered during recent years,paving the way for an increasing market for edible *** protein and amino acid balance make them a promising source of protein for replacing high value *** mealworm,Tenebrio molitor L.(TM;Coleoptera:Tenebrionidae)larvae,have shown positive effects on broiler performance in several research studies and have a strong potential as a sustainable alternative protein source for monogastric *** study aimed to assess the effect of replacing various ratios of basal diets with *** larvae on broiler performance as well as on several meat and welfare *** the study,120 one-day-old male chicks(Ross 308)were randomly allocated in 3 treatments and 4 replications(10 birds per pen).Birds of the control group(basal diet)were fed with typical commercial maize and soymeal-based rations in mash *** other 2 groups were treated with the same diet,after replacing 5%and 10%with dried TM larvae,*** d 35(end of trial),meat samples were collected and *** weight,feed intake,body weight gain and feed conversion ratio during the periods of 1 to 10 d(starter period),11 to 24 d(grower period),25 to 35 d(finisher period)and 1 to 35 d(total period)were ***-dermatitis,diarrhoea,feather score and litter conditions were also assessed during the *** results indicated that TM larvae inclusion in the broilers'diet positively affected body weight gain values,as well as the carcass yield,the meat composition and various welfare ***,the dietary treatments with TM larvae favourably affected meat composition and colour parameters,whereas there were also some positive effects on lipid and protein *** fatty acids were decreased by the dietary supplementation whereas the polyunsaturated fatty acids to SFA ratio *** general,the study showed that whole TM larvae addition can provide a promising alternat

关键词： Tenebrio molitor larvae Broiler Performance Welfare Meat trait

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Helicobacter pylori,gastric microbiota and gastric cancer relationship:Unrolling the tangle

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World Journal of Gastrointestinal Oncology 2022年第5期14卷 959-972页

作者： christos Liatsos Apostolis Papaefthymiou nikolaos Kyriakos Michail Galanopoulos Michael Doulberis Marios Giakoumis Evangelia Petridou christos Mavrogiannis Theodore Rokkas Jannis Kountouras Department of Gastroenterology 401 General Military Hospital of AthensAthens 11525Greece Gastroenterology University Hospital of LarissaLarissa 41336Greece Division of Gastroenterology and Hepatology Medical University DepartmentKantonsspital AarauAarau 1234Switzerland Department of Microbiology “Agia Sofia”Paediatric HospitalGoudiAthens 11527Greece Gastrointestinal and Liver Unit Faculty of NursingKifissia General and Oncology HospitalKaliftakiN.Kifisia 14564Greece Gastroenterological Clinic Henry Dunant HospitalAthens 11525Greece Department of Internal Medicine Second Medical ClinicIppokration HospitalAristotle University of ThessalonikiThessaloniki 41336MacedoniaGreece

Helicobacter pylori infection(Hp-I)represents a typical microbial agent intervening in the complex mechanisms of gastric homeostasis by disturbing the balance between the host gastric microbiota and mucosa-related factors,leading to inflammatory changes,dysbiosis and eventually gastric *** normal gastric microbiota shows diversity,with Proteobacteria[Helicobacter pylori(***)belongs to this family],Firmicutes,Actinobacteria,Bacteroides and Fusobacteria being the most abundant *** studies indicate that *** has inhibitory effects on the colonization of other bacteria,harboring a lower diversity of them in the *** comparing the healthy with the diseased stomach,there is a change in the composition of the gastric microbiome with increasing abundance of ***(where present)in the gastritis stage,while as the gastric carcinogenesis cascade progresses to gastric cancer,the oral and intestinal-type pathogenic microbial strains ***-I creates a premalignant environment of atrophy and intestinal metaplasia and the subsequent alteration in gastric microbiota seems to play a crucial role in gastric tumorigenesis *** *** eradication is suggested to restore gastric microbiota,at least in primary *** is more than clear that Hp-I,gastric microbiota and gastric cancer constitute a challenging tangle and the strong interaction between them makes it difficult to *** studies are considered of crucial importance to test the complex interaction on the modulation of the gastric microbiota by *** as well as on the relationships between the gastric microbiota and gastric carcinogenesis.

关键词： Helicobacter pylori infection Gastric microbiota Gastric cancer Oncogenesis Dysbiosis Helicobacter pylori eradication

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Soft monolithic infrared neural interface for simultaneous neurostimulation and electrophysiology

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Light(Science & Applications) 2023年第6期12卷 1103-1116页

作者： Marcello Meneghetti Jaspreet Kaur Kunyang Sui Jakob F.Sørensen Rune W.Berg christos Markos DTU Electro Department of Electrical and Photonics EngineeringTechnical University of DenmarkDK-2800 KgsLyngbyDenmark Department of neuroscience University of CopenhagenBlegdamsvej 3BDK-2200 Kbh NCopenhagenDenmark nORBLIS ApS Virumgade 35DDK-2830 VirumDenmark

Controlling neuronal activity using implantable neural interfaces constitutes an important tool to understand and develop novel strategies against brain *** neurostimulation is a promising alternative to optogenetics for controlling the neuronal circuitry with high spatial ***,bi-directional interfaces capable of simultaneously delivering infrared light and recording electrical signals from the brain with minimal inflammation have not yet been ***,we have developed a soft fibre-based device using high-performance polymers which are>100-fold softer than conventional silica glass used in standard optical *** developed implant is capable of stimulating the brain activity in localized cortical domains by delivering laser pulses in the 2μm spectral region while recording electrophysiological *** and local field potentials were recorded in vivo from the motor cortex and hippocampus in acute and chronic settings,*** analysis of the brain tissue indicated insignificant inflammatory response to the infrared pulses while the signal-to-noise ratio of recordings still remained *** neural interface constitutes a step forward in expanding infrared neurostimulation as a versatile approach for fundamental research and clinically translatable therapies.

关键词： neural stimulation recording

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Lyophilized recombinant human brain natriuretic peptide: A promising therapy in patients with chronic heart failure

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World Journal of Clinical Cases 2023年第36期11卷 8603-8605页

作者： christos Kourek Alexandros Briasoulis Grigorios Giamouzis John Skoularigis Andrew Xanthopoulos Medical School of Athens National and Kapodistrian University of AthensAthens 15772Greece Department of Clinical Therapeutics Alexandra HospitalFaculty of MedicineNational and Kapodistrian University of AthensAthens 11528Greece Department of Cardiology University Hospital of LarissaLarissa 41110Greece

Lyophilized recombinant brain natriuretic peptide(BnP)is an exogenous peptide synthesized by artificial recombination technology,with a similar structure and similar physiological effects with the endogenous natriuretic peptide secreted by the human ***’s main mechanism of action is to increase cyclic guanosine monophosphate by binding with its corresponding receptor in the body,regulating,thus,the imbalance of the vascular system and cardiac hemodynamics,improving the heart’s pumping capacity,and inhibiting sympathetic excitability and myocardial ***,it can promote mitochondrial metabolism and enhance the use of adenosine triphosphate in *** the present study,102 chronic heart failure(HF)patients were randomly assigned to a control and an observation group consisting of 51 patients *** of the control group were treated with standard HF therapy for 3 d including oral metoprolol tartrate tablets,spironolactone,and olmesartanate while patients of the observation group were administered the recombinant human BnP injection for the same time-period,plus the standard HF *** recombinant human BnP group(observation group)demonstrated better physical,emotional,social,and economic scores,as well as cardiac and inflammatory biomarkers such as serum hypersensitive C-reactive protein,n-terminal pro BnP and troponin I levels,compared to the control ***,cardiac function was also improved,as left ventricular ejection fraction and stroke volume were significantly higher in the observation group than in the control ***,adverse reactions were not different between the 2 ***,these results are not generalizable and the need of large multicenter randomized controlled trials examining the safety and efficacy of recombinant human BnP in HF patients is of major importance.

关键词： Heart failure Recombinant Brain natriuretic peptide Outcomes

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