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1972 Uppsatser om Flow efficiency - Sida 45 av 132
Kombinerat system för ventilation och rumsuppvärmning : Parameterundersökning i simuleringsmodell för takvärmesystem
A large amount of our time is spent indoors in an artificial climate. To make the experience pleasant there are requirements on the ventilation and the heating system. At the present time the most common form of heating is a radiator system complemented with a ventilation system. A ceiling heating system with combined heating and ventilation can replace the two separated systems. The benefit with a ceiling heating solution is that it saves space since the radiator system is no longer needed.
Nyfikenhet i skolans värld : Vad elever i montessoriklass beskriver som lustfyllt lärande
Studien har genom intervjuer i fokusgrupper undersökt vad elever i montessoriklass erfar som lustfyllt i sin lärmiljö. Elevernas svar har satts i relation till den forskning som finns kring motivation och framgångsfaktorer för lärande samt till montessoripedagogiken.De teorier som studien utgår ifrån är olika motivationsteorier, teorier relaterade till motivation samt montessoripedagogik. Även framgångsfaktorer för lärande beskrivs. Tillvägagångssättet i analysen av fokusgruppsintervjuerna har inspirerats av fenomenografisk metodansats. De två forskningsfrågor som studien ger svar på är vad elever på mellanstadiet och högstadiet, i de undersökta montessoriklasserna, framför som orsaker till att de känner nyfikenhet att lära sig mer i skolan, samt vilka av dessa faktorer som är kopplade till montessoripedagogikens principer, och om de går att överföra till all undervisning. Resultatet av studien visar att eleverna pekar ut läraren som viktig för huruvida de ska känna nyfikenhet och lust i lärandet.
Scennärvaro
Den här uppsatsen är ett försök att ringa in och samla ihop tankar kring vad det är att vara närvarande på scen samt hur man kan lära ut det. Arbetet innehåller citat och referat från intervjuer med sju personer: En skådespelare, en koreograf, en jazzsaxofonist och improvisatör, två sångerskor och sångpedagoger, en sångerska och låtskrivare samt en klassisk altviolininst. Här finns också citat och referat ur relevant litteratur. Arbetet ska ses som en ingång till ämnet snarare än en djupdykning..
Analys av turbulensmodeller för CFD
This thesis has been a part of Forsmarks Kraftgrupp AB's evaluation of a turbulencemodel used in simulation of turbulent flow called PRNS (Partially Resolved NumericalSimulation). This model has promising properties and may be of use in savingcomputational resources. The purpose of this thesis was to analyze this model andcompare it with industrially applied models such as k-omega SST and LES (Large EddySimulations).PRNS works as a hybrid of the k-omega SST and DNS (Direct Numerical Simulation)where a constant, RCP (Resolution Control Parameter) with a value between 0 and 1are selected. This constant is then used in the calculations and determines thebehavior of the simulation. When RCP is set to zero the equation are the same as fora DNS simulation and when RCP is set to one the equations for k-omega SST issolved.
Energieffektivisering genom förvärmning av flis till kokare med sekundärvärme
The Swedish pulp and paper industry meets higher demand for energy efficiencyi mprovements with increasing energy prices and changes in the Swedish renewable energy certificate system. One action of energy efficiency improvement is by using secondary heat, that otherwise would have been treated as waste heat, for use in a system with lower temperature demands. The aim of this Master´s thesis is to identify possible secondary heat sources in a typical Swedish pulp and paper mill and to investigate what economic benefits the secondary heat will provide when being used for pre heating of wood chips to a kraft digester.The Master´s thesis focuses on three secondary heat sources; dry warm air, warm water and moisture saturated warm air located inside the pulp or paper mill. Two types of kraft digesters are simulated within this study, a typical Scandinavian digester and a modern twin vessel steam phase digester.Due to quality aspects and low temperature level drying is the drying technology with dry warm air rejected. Using warm water in direct contact with wood chips increases the quantity of water to the evaporation plant and thus reduced pulp or paper production and is therefore also rejected.
Hinder och möjligheter med jobbcoachning : utifrån jobbcoachers och arbetssökandes syn på insatsen
Abstract This qualitative interview study focuses on job coaching by examining what thoughts, views and opinions the involved parties, such as job applicants and job coaches, have of the contribution. The aim is to highlight the obstacles and opportunities by examining the expectations that exist from both parties as well as how to look at job coaching and its different areas. In this context, examine the similarities and differences between the two parties approach to the contribution. This is made possible through four interviews with job applicants as well as four interviews with job coaches. A grounded theory inspired approach was used to obtain the results of the study.
Återvinning av industriell restvärme som värdeskapande process : En fallstudie på SSAB EMEA i Borlänge
The industrial sector accounts for a large share of greenhouse gas emissions. To reduce its negative impact on the environment is crucial in the quest for a sustainable future. In discussions of the industrial sector's impact on the environment guidelines have been highlighted as a tool to assist the industries in their efforts to change the relationship between the consumption of energy and production. This by improving energy efficiency and a shift to the best available technology. During the past 30 years the steel industry has reduced its energy consumption per ton of steel produced by 50 percent.
Tvådimensionella rum
We are always surrounded by space, not just only in a room with four walls, but also when we are outdoors.Constantly we move in a flow of space that changes whenever we move. Unaware we are affectedby this threedimensional surrounding of ours, and it reacts with our perception. Many times, we chooseto translate it into something two-dimensional, for example when we take a photo, recording a movie orframing a view with a window. It helps us to catch a moment, a piece of reality and restore it in our ownway. In this project I?ve chosen to explore this process, to interpret and create my own theories about thistranslation from space to a two-dimensional surface.
Solenergi En del i ett långsiktigt, hållbart byggande
The sun is essential to life on earth and no matter where you are, there is a constant need ofenergy. Nearly 800 000 years ago man learned for the first time to use fire in a controlled way.Since then, fire has given us the opportunity to inhabit places despite a cold climate. In Swedenthe resident sector accounts for a major part of the total consumption of energy. In a time whenenvironmental issues and greenhouse effects are increasing, we also see a future of rising energyprices. With this perspective, we have in this bachelor thesis in the Building Environment at theRoyal Institute of Technology, KTH, in Stockholm decided to focus on the renewable energysource, solar energy.The energy from solar radiation is a free resource and does not have any negative effects uponthe environment.
Morgondagens effektiva fjärrvärme : En beskrivande litteraturstudie
This report is made as a literature review, focusing on the work done to increase understanding of efficiency in the categories of substations and secondary heating systems, with respect to the deviation from the theoretically possible cooling off in the distribution network as well as the economic benefit that appear. The main purpose of a considerable part of the literature used in this report addresses the issue of identifying individual causes of reduced cooling in district heating systems. These literature resources have been compiled and summarized as part of the report.The technology of district heating is associated with benefits such as better use of the energy in a fuel. This is the case of cogeneration plants where serial generation of electricity and thermal energy increases efficiency compared with the parallel generation where heat is generated locally and electricity is generated centrally. Serial generation thus allows for lower primary energy demand.
Kvarteret Kajutan - Från lågenergi till plusenergi
Energy and environmental demands regarding buildings have become an increasinglydiscussed topic, both in Sweden and in Europe as a whole. The general trend indicatesthat greater efforts are being put into the energy efficiency of the built environment.There are already numerous examples of houses with a low energy demand, and thenumber of low energy buildings is constantly growing.At the time being, the maximum level for energy demands for housing in Stockholm is110 kWh/m2year, but as soon as next year the limit will be changed to 90. The Swedishagency Energimyndigheten is currently conducting a project to interpret the EU Directiveon the so-called Nearly zero energy buildings, and the preliminary results indicate thatthe level of requirements for purchased energy will end up with about 55 kWh / m2year,which is in line withtoday?s recommendationsfound in FEBY's Kravspecifikation förPassivhus.Starting with a low-energy house in Henriksdalshamnen in Stockholm, we have analyzedvarious energy-efficiency measures and their influence on power and energy needs. Thefinancial aspects associated with the measures have been studied using a model of lifecycle costs.The measures were initially studied individually to give an idea of how much impact theyeach had.
Kreativa aktiviteters betydelse för äldre personers hälsa och välbefinnande : En systematisk litteraturstudie
Bakgrund: Kreativa aktiviteter har funnits inom arbetsterapin genom yrkets hela historia. Att vara aktiv är ett grundläggande behov hos människan. Aktivitet används både som mål och medel inom arbetsterapi för att främja personers hälsa och välbefinnande. Syfte: Att beskriva betydelsen av deltagande i kreativa aktiviteter, inom arbetsterapi eller på egen hand, för äldre personers hälsa och välbefinnande. Metod: Uppsatsen är genomförd som en systematisk litteraturstudie.
Effektivisering av arbetsplats : Effektivisering av monteringsplats vid Wigells AB
The work presented in this report is written at IEIs department on Linköping Institute of Technology. The report aims to increase the assembly efficiency at Wigells AB. The report shall be used as a guide for the implementation of changes at other workstations in the company. Together with Träcentrum in Nässjö, Wigells AB has identified the needs of this study and contacted IEI at Linköping Institute of Technology.In order to implement an efficient assembly line at the company, studies on lean production have been made. This theory has been studied and together with our own views and findings at the company we have analyzed the assembly area.Wigells is a small company that manufactures wood furniture.
Effektivitetsparadoxen - En eventstudie av handelsstopp på Stockholmsbörsen mellan 2003 och 2008
A trading halt is a measure conducted by a securities exchange in order to reduce information imbalances between market participants, thus enabling a higher level of market efficiency. A market is said to be efficient when new information concerning a company is instantly reflected in its stock price, implying that abnormal stock returns cannot be systematically achieved in an efficient market. The purpose of this study is to examine the occurrence of abnormal stock returns following trading halts on the Stockholm Stock Exchange. The study is based on a sample of 64 trading halts executed between January 2003 and February 2008. Historical daily prices for stocks subject to trading halts during the period have been gathered from the Datastream Advance database, while information on date and time of trading halts have been collected from the Stockholm Stock Exchange website.
Unga idrottares upplevelser granskat genom flow-teorin
Skolan har fått i uppdrag att implementera hållbar utveckling i undervisningen. Enligt skolverket ska hållbar utveckling genomsyra all utbildning. För att undersöka hur lärande i hållbar utveckling har implementerats i undervisningen intervjuade jag sex lärare på en gymnasieskola. Lärarna som intervjuades arbetade som naturkunskapslärare, fysiklärare och samhällskunskaps-lärare. Studien visar att de intervjuade lärarnas syn på vad hållbar utveckling i undervisningen innebär varierar.