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3466 Uppsatser om Production flow - Sida 63 av 232
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.
Simon K. Bobergs iscensättning av Spiro Scimones "Konvolutten". En samtida samhällssatir med kopplingar till Commedia dell' arte
La Busta/Konvolutten/The envelope was written in 2006 by the Italian playwright, director and actor Spiro Scimone. It is a contemporary political farce with clear roots and inspiration from Commedia dell´arte. As the main structure for this essay, comparisons have been made between a modern Danish production of Konvolutten by the director Simon K. Boberg and the form and structure of Commedia dell´arte. The importance and use of the political context in both Commedia dell´arte and Konvolutten are explored.The sociopolitical conditions under which Husets Teater (The House´s Theatre) works is analyzed.
OTEC för Tarawa
Ocean Thermal Energy Conversion, OTEC, a technology using the temperature difference between cold deep seawater and warm surface water, can extract the work in the form of electricity. OTEC gives also synergies of drinkable fresh water. The temperature difference has an impact on the efficiency of the technology, which means that the feasibility of OTEC is geographically limited. The project intends to explore the possibility of replacing the atoll Tarawa?s present electricity generation with an OTEC plant and to explore synergies. In the present situation all of Tarawa?s electricity is generated by fossil fuels.
Cinematic animation in a production pipeline
Detta arbete kommer att visa hur det är att jobba som animatör på Framestores reklamavdelning i London. Jag går igenom den del av pipelinen som är relevant för mig som animatör och jag kommer även att redovisa arbetsmetoder för att snabbast leverera korrekta animationer..
Formgivning av magasin i ett redaktionellt utvecklingsarbete
Tidningskompaniet, a publishing agency in Göteborg, has during the spring of 2003 developed a customermagazine for Göteborgsvarvet, a Half Marathon Race in Göteborg. If realized the magazine shallbe distributed to former participants of the race twice a year and will be financed by adverts.As part of the editorial concept, development of a graphic profile will be made for the magazine. Thisdegree project will result in the production of a »dummy« magazine to be presented to the client and tobe used by the advertisement sales people in their work.The magazine, named »Varvet«, will convey the message that anyone can run Göteborgsvarvet. Theintention is to give the magazine a »youthful and sporty« image.The work in this degree project has comprised designing the magazine in co-operation with an editorialconcept developer and a project leader at Tidningskompaniet, and also the production of 18 magazinepages including prepress work. The magazine has been made into a strictly sectionized product,with a mix of short and long articles with lighter material and strict how-to-do-it guides.
Förrotation till omrörare
The primary function of a mixer is to keep a fluid in constant motion. All mixing applicationsrequire varying degrees of small-scale turbulence and bulk flow. The performance of asubmersible mixer is measured by the thrust that it produces, while the strength of the bulkflow is dependent on the total amount of installed thrust.In a mixer, the fluid quickly flows past the propeller, and as a result, the current is mainlyaxial. The fluid will also obtain a rotating velocity, or a swirl, though this is significantly lessthan that of the propeller. During the process, the total amount of energy increases in the formof static pressure and kinetic energy.
Drainfill
Ocean Thermal Energy Conversion, OTEC, a technology using the temperature difference between cold deep seawater and warm surface water, can extract the work in the form of electricity. OTEC gives also synergies of drinkable fresh water. The temperature difference has an impact on the efficiency of the technology, which means that the feasibility of OTEC is geographically limited. The project intends to explore the possibility of replacing the atoll Tarawa?s present electricity generation with an OTEC plant and to explore synergies. In the present situation all of Tarawa?s electricity is generated by fossil fuels.
En renässans för kallväxthuset :
The unheated greenhouse was originally a development from orangeries in the 1700th century and in 1930 and 1940 in blocks of greenhouses in the province of Scania. Today unheated greenhouses are used in permaculture, in the?eco villages? and in commercial culturing. Of the total Swedish commercial greenhouse area is today 8 % used as unheated greenhouses (SJV).
This essay is based on the acceptance that unheated greenhouses will have a renaissance as production units.
In the light of the today?s debate about energy ? and environment and the condition concerning this, the unheated greenhouse becomes an alternative.
The purpose of this essay is to make an arguing synopsis about unheated greenhouses for using in acting as teacher, consultant and inspirer and also for taking part of the acceptance as ?for? or ?against?.
The information is based on literature studies and information gathered with the keywords unheated greenhouse, coolhouse, coldhouse, greenhouse, type of greenhouse, orangery, greenhouse cultur, swedish greenhouse culture and permaculture, data gathering through SCB/SJV and by interviews with persons in the garden branch.
My conclusion is that the unheated greenhouse could have a renaissance as a production unit.
In this context it is important to give cultivators of greenhouses with experiences of unheated greenhouses great possibilities to share their knowledge, and through education possibility to change attitudes concerning unheated greenhouses.
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Ställtidsreduktion med hjälp av SMED
Syftet för det här examensarbetet var att praktiskt reducera ställtiden på enbefintlig produktionslinje på Ruukki i Halmstad. Vid tiden då författarna togkontakt med företaget var den nuvarande ställtiden alldeles för lång och långtifrån optimal. I samband med projektets start gjordes det ett antal avgränsningaranpassat till den tiden som fanns tillgänglig.Tillvägagångssättet och metodiken till lösningen bakom ställtidsproblematikenföljer Shigeo Shingos Single Minute Exchange of Die (SMED), där har författarnautfört analyser i form av iakttagelser och tidtagning. Upptäckterna som gjordesunder analys samt implementering var att även om SMED är en direkt metodik förställtidsreduktion finns det andra faktorer som kan motverka implementeringensamt dess goda resultat. Dessa faktorer som påvisades under projektets gång varbland annat de mänskliga aspekterna och den bakomliggande företagskulturen iorganisationen.
Formgivning av ögonduschkork : Examensarbete, formgivning
This Master thesis was written for Lantmännen Agroetanol in Norrköping concerning the layout of their finished goods inventory and unloading of feed after introducing a new product mix. Lantmännen Agroetanol has two production lines which produces feed. Both lines lead to six silos, used as inventory of finished goods. The feed from the two production lines differ in terms of quality, where as Lantmännen Agroetanol wants to separate their finished inventory in order to charge a higher price, by selling the better product as a premium. With two different feed products the yearly revenue is expected to increase which motivates a research about the current capabilities and necessary changes to be made in the factory.
Profitability and competitiveness of grain handling at farm level
The Swedish agricultural sector is currently experiencing substantial structural changes, where the number of agricultural enterprises continuously decreases and the average farm size increases. In order to maintain competitiveness, it is important to be aware and adapt to changes concerning the surroundings of the company (Johnson et al., 2011). Agricultural commodity prices sharply fluctuate on the global market in recent years, affecting the profitability of farmers. High volatility market requires tools to reduce price variations and increases the need of decision-making (Bouder & Beth, 2003). Farm-based grain handling facilities increases the sale options regarding agricultural commodities; a flexible strategy to get additional compensation for the storing the grain produced on the farm (Edling, 2002; Edwards, 2013).
Biologisk mångfald och skogsproduktion : -en målkonflikt i skogen?
The purpose of this work, has been to examine how different actors in the Swedish eco movement and the Swedish forest industry looks at Sweden?s forest policy statement, which claims that environmental goals and production goals should be equal in Swedish forestry. By assembling focusgroups with participants from the Swedish eco movement and the Swedish forest industry, we look at if these participants consider the Swedish forest policy goals equal or not. Conflicts do occur between the two forest policy goals, but also between those and others of Sweden?s environmental goals.
Val av värme- och ytbehandling
Atlas Copco Tools develops and manufactures handheld industrial tools. Heat and surface treatments are used to provide the tools with certain properties. There are no routines for the choice of treatment or for how to specify treatment on drawings. Production documents that are sent for production abroad may not be clear enough. Some treatments are known as trademarks and there are no instructions for how to specify these on drawings and in CAD-models.The purpose of this master thesis work is to create recommendations for the procedure of choosing heat and surface treatment.
Utveckling av lastmodell för Uppsala fjärrvärmenät
The aim of this study was to develop a load prognosis model for Uppsala district heating system to be used as a tool for heat production optimization. The methodwas to build three models for the different customer types; housing, industry andoffices and then scale them for the total system using data from Uppsala districtheating system. The heat load consists of two parts, one that is temperaturedependent and one that is dependent of the social behavior of the customers. Thetemperature part was modelled with an ARX model using an outdoor temperatureprognosis as input signal. The social behavior part was modelled using the mean ofthe social behavior from some days before and additionally by distinguishing betweenweekdays and weekends.
Delta X : Utveckling av värmeväxlare
Stockholms vattenskärning AB in Kungsängen has through the acquisition of a company begun to design and produce aircraft heaters whose origin is early 1970s which follows a high inefficiency in terms of energy consumption and size.The aircraft heater, which is sold worldwide, serves its purpose for customer satisfaction and has done so ever since it was developed in the 70s.Stockholms vattenskärning AB is now investigating the possibility in making the aircraft heaters more efficient, both in terms of energy consumption but also on a more efficient design with the belief that it would lead them to an edge in the market. The aircraft heater consists of several main components whose function altogether is to keep passenger aircrafts warm while they are on the ground.This project has been limited to the further development of the heat exchanger package which accounts for the conversion of the hot medium to the fresh air being carried in to the aircraft cabin. Work has been divided into different phases in order to create a better understanding of the project range and to make it easier to divide the various elements in the time available, 10 weeks. These phases are literature review, situation analysis, concept generation, CAD, concept comparison and writing reports.After the initial literature review was made, a fundamental theory was written which is essential in understanding the remaining parts of the project.With the theoretical part as support, measurements and calculations were made on the current heat exchange package in a situation analysis to ensure its operation and efficiency.In the concept generation phase, the collected facts from the literature review was used as the basis for creating a matrix. The purpose of the matrix was to indicate the two most suitable types of heat exchangers to develop four new concepts out of.In the CAD phase the four concepts was drawn up and then described with text and images.The last phase is the concept comparison where a concept selection matrix is used to function as a decision basis for further production at Stockholms vattenskärning AB. The four concepts have been developed based on the current heat exchanger and is gradually changed into a design of a cross-flow heat exchanger constructed out of stainless sections. The purpose of this is to have gradual upgrading of the heat exchanger as an option, in order not to saturate the market..