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Grey box modeling of supermarket refrigeration cabinets

Energy and AI 2023年第1期11卷 63-70页

作者： K.Leerbeck P.Bacher C.Heerup H.Madsen DTU Compute Bygning 3242800 Kongens LyngbyDenmark gregersensvej 2 2630 TaastrupDenmark

Aiming to enable robust large-scale fault diagnostics and optimized control for supermarket refrigerationsystems, a data-driven grey box model for an evaporator and its surrounding cooling cabinet (or room) ispresented. It is a non-linear model with two states: the cabinet temperature and the refrigerant mass in theevaporator. To demonstrate its applicability, data with one-minute sampling resolution from ten evaporators ina supermarket in Otterup (Denmark) was used. The model parameters were estimated using a Kalman filter andthe maximum likelihood method. Since the dynamical properties of the cabinets constantly change as goodsare added and removed, the parameters were re-estimated for each night, over a period of approximately 2.5years. The model is validated through a statistical analysis of the residuals and the importance of the ongoingre-estimation of parameters is highlighted. Furthermore, the physical meaning of the estimated parameters isdiscussed and potential applications for characterization and classification of cabinets are demonstrated, byshowing how they can be differentiated as either open- or closed cabinets or rooms, using only the estimatedheat transfer coefficients and heat capacities. For a selected case it is shown that the estimated parametervalues are close to physics derived values, and that the accuracy measured by the standard errors of theestimates is approximately ±10% relative to the estimated values. The analysis demonstrates that the modelis robust, accurate and reliable in terms of estimating physically meaningful parameters and it is thereforeappropriate for large-scale implementation.

关键词： Grey box modeling CO_(2) refrigeration systems Refrigeration cabinets and evaporators System identification Classification

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Nonlinear Viscoelastic Response of Thermoplastic-Elastomer Melts

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Advances in Applied Mathematics and Mechanics 2010年第1期2卷 1-31页

作者： Aleksey D.Drozdov Erik A.Jensen Jesper deClaville Christiansen Danish Technological Institute Gregersensvej 12630 TaastrupDenmark Aalborg University Fibigerstraede 169220 AalborgDenmark

Observations are reported on thermoplastic elastomer(ethylene-octene copolymer)melt in small-amplitude shear oscillatory tests and start-up shear tests with various strain rates in the interval of temperatures between 120 and 210◦*** on the concept of heterogeneous non-affine polymer networks,constitutive equations are developed for the thermo-mechanical behavior of a melt at threedimensional deformations with finite *** parameters in the stress–strain relations are found by fitting the experimental *** model is applied to the analysis of Poiseuille *** effects of temperature and pressure gradient on the steady velocity profile are studied numerically.

关键词： Non-affine polymer network thermo-viscoelasticity elastomer melt constitutive model Poiseuille flow

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SCALABLE AND QUANTITATIVE DECISION SUPPORT FOR THE INITIAL BUILDING DESIGN STAGES OF REFURBISHMENT

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Journal of Green Building 2019年第4期14卷 35-56页

作者： Sarah C.Andersen Kathrine L.Moller Simon W.Jorgensen Lotte B.Jensen Morten Birkved Technical University of Denmark Department of Civil EngineeringBrovej2800Kgs.LyngbyDenmark Technical University of Denmark Department of Management EngineeringProduktionstorvet2800Kgs.LyngbyDenmark Danish Technological Institute Gregersensvej2630 TaastrupDenmark A4 arkitekter og ingeniører Gladsaxevej 1042860 SoborgDenmark Hovedstadens Beredskab Bag Radhuset 31550 Copenhagen VDenmark University of Southern Denmark Department of Chemical EngineeringBiotechnology and Environmental TechnologyCampusvej 555230 Odense-MDenmark

Decision-making within the building industry often involves various criteria of very different *** are qualitative,others quantitative,some are objective,others subjective,but ultimately,they should all be aggregated and handled holistically in order to support *** process can also be referred to as multi-criteria decision-making(MCDM).Some aspects of MCDM are often conducted unconsciously and *** implementing mathematical methods that have been proved applicable for MCDM,multi-criteria decision-making processes can be handled more consciously and transparently and thus be made *** calculation method presented allows quantitative sustainability and qualitative indicator values to be accounted for with the level of importance *** MCDM method used is Technique for Order of Preference by Similarity to Ideal Solution(TOPSIS).As the model has already been described well in the scientific literature and is used frequently,the aim is to illustrate how TOPSIS can be applied for transparent decision-making within the building industry in the context of urban renewal and refurbishment schemes through case studies of various scales and *** case studies focused on in this paper incorporate a variety of specific pre-chosen criteria,including environmental performance,functional parameters and technical *** case studies cover different parameters of refurbishment in a major hospital compound in Denmark due to be taken out of *** central design decision is whether to refurbish or demolish the old hospital *** results reveal that decision support is first of all dependent on how the decision-making tool is applied and what choices are made in relation to the actual ***,by implementing a mathematically based MCDM method like that being assessed in the case studies presented,the decisions and their argu-ments become transparent and are easily communicated withi

关键词： Multi-Criteria Decision Making(MCDM) mathematical decision support building design transparent decision making refurbishment urban renewal

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联合国环境规划署产业与环境办事处卤代溶剂清洁生产工作组

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产业与环境 1992年第4期 11-11页

作者： ***,陈兴吴丹麦技术院环境技术部 gregersensvej P.O.Box 141 DK-25630 Tasstrup Danmark

联合国环境规划署产业与环境办事处（UNEP/IEO）清洁生产计划努力改变目前关于如何生产产品及生产何种产品的观念,以最大限度减少（如果不消除）排放和废物。卤代溶剂工作组是清洁生产计划中的行业工作组之一。它侧重于识别和传播与溶... 详细信息

联合国环境规划署产业与环境办事处（UNEP/IEO）清洁生产计划努力改变目前关于如何生产产品及生产何种产品的观念,以最大限度减少（如果不消除）排放和废物。卤代溶剂工作组是清洁生产计划中的行业工作组之一。它侧重于识别和传播与溶剂领域有关的情报。以下扼要介绍清洁生产概念,以及卤代溶剂工作组的活动。什么是清洁生产?

关键词：联合国环境规划署清洁生产联合国环境署联合国专门机构无污染工艺工作组溶剂卤代办事处产业

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联合国环境规划署和臭氧层保护工业合作社(ICOLP)合作加强臭氧行动情报交流站

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产业与环境 1992年第4期 11-11页

作者：陈定茂 ,Aage *** 丹麦技术院环境技术部 gregersensvej P.O. Box 141 DK-25630 Taastrup Danmark

在臭氧层保护临时多边基金会的实施框架之内,联合国环境规划署产业与环境办事处已被赋予建立和维护一个关于削减《蒙特利尔议定书》控制的臭氧耗损物质（ODS）的国际情报交流站的责任。这个称为“臭氧行动情报交流站”的新情报源的目的... 详细信息

在臭氧层保护临时多边基金会的实施框架之内,联合国环境规划署产业与环境办事处已被赋予建立和维护一个关于削减《蒙特利尔议定书》控制的臭氧耗损物质（ODS）的国际情报交流站的责任。这个称为“臭氧行动情报交流站”的新情报源的目的,是把关于臭氧耗损物质削减方案的技术、计划和政策信息传递给工业界、政府及其组织.以帮助它们达到《蒙特利尔议定书》的淘汰截止日期。作为其提供这种信息的使命的组成部分,这个交流站专门尽力消助那些已成为《议定书》缔约国的发展中国家。

关键词： ICOLP 情报交流《议定书》信息传递

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