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983 Uppsatser om Heat transfer - Sida 5 av 66
Solenergi och värmelagring i kvarteret Lagern
Humanity stands before a huge challenge to lower its emissions of carbon dioxide and its use of energy at the same time as the global population is rising and the developing countries are being industrialized. A lot of newly built buildings are due to this challenge, designed to be more energy efficient but also use renewable energy resources instead of pollutant fossil fuels .Solar energy is one of the purest forms of energy that exists in abundant amounts, which is why it is most likely that it could come to play a major part in the future energy market. The main purpose of this report is to investigate the possibility to implement a sustainable energy system with solar thermal heat and heat storage as main sources of energy in the neighborhood ?kvarteret Lagern?, which is the area where the old football stadium ?Rasunda Stadion? was located. New developments within different heat storage techniques have opened up new approaches to enable buildings an all year round heat supply from solar energy. This report will focus on heat storage in boreholes. At the present here is only a preliminary plan of how the neighborhood is supposed to be designed.
Företagsstudie om värmeöverföring : Beskrivning av värmeflöden hos en lagerbyggnad
The study took place at a food corporation in Växjö, Sweden. It describes a building that contains four tanks in which glucose syrup is stored. The purpose of the study was to calculate the amount of heat that leaves the building and the amount of heat that is supplied by the installed heating equipment. Before the calculations could be implemented, all the systems that supply the building with heat had to be examined. With a small amount of information from earlier studies, the work to gather all the data necessary for the calculations began.
Högtempererat borrhålslager för fjärrvärme
The district heating load is seasonally dependent, with a low load during periods of high ambient temperature. Thermal energy storage (TES) has the potential to shift heating loads from winter to summer, thus reducing cost and environmental impact of District Heat production. In this study, a concept of high temperature borehole thermal energy storage (HT-BTES) together with a pellet heating plant for temperature boost, is presented and evaluated by its technical limitations, its ability to supply heat, its function within the district heating system, as well as its environmental impact and economic viability in Gothenburg, Sweden, a city with access to high quantities of waste heat.The concept has proven potentially environmentally friendly and potentially profitable if its design is balanced to achieve a good enough supply temperature from the HT-BTES. The size of the heat storage, the distance between boreholes and low borehole thermal resistance are key parameters to achieve high temperature. Profitability increases if a location with lower temperature demand, as well as risk of future shortage of supply, can be met.
Vilka effekter har lojalitetsprogram på kundlojalitet? : En studie om frequent flyer-program och deras effekt på kunderna
The arm?s length principle has existed in Swedish law since 1928 but has previously been given little attention. In 2007, documentation requirements were introduced, and the government began to do tax audits regarding transfer pricing. This thesis examines how the documentation requirements and tax audits affect the application of the arm's length principle. The research consists of nine interviews with a total of ten people at the tax authority (Skatteverket) and audit- and consulting agencies. The results of the interviews are analyzed using the agency theory. Many companies are risk averse and prefer having correct transfer pricing instead of taking on challenging strategies that can be risky in case of an investigation by Skatteverket.
Värmeförluster vid utvändigt placerade ventilationssystem
To be able to handle tomorrows need for limited energy consumption we need to reduce our use of energy. The building sector stands for around 40 % of all energy consumption in the society. The government has put up a goal to reduce the energy consumption in our buildings with 20 % by year 2020 and 50 % by year 2050 compared with year 1995. To be able to do reach that goal we need a more energy efficient building stock.The main part of the energy used in our buildings is used for space heating. By installing ventilation systems with heat recovery on the exhaust air it is possible to use the heat-energy in the exhaust air to warm up the incoming air.
Radiolänk med GNU Radio
At the Department of Technology and Built environment at the University of Gävle there was an interest to study GNU Radio, which is an "open source radio project. The project is based on that most of the radio signal processing is made in an ordinary PC. The idea behind this degree project was that in a laptop there are several radio transmitters/receivers that takes space, generates heat and transmit in varied frequency band etcetera. All these radio transmitters/receivers could be replaced with a Software Defined Radio system. It means that one common, general radio hardware is used to different communications such as: WLAN, Bluetooth, GPRS, 3G etcetera. The waveform is generated in the software, which makes the system very flexible.
Hur vi kan förstå riskbedömning på nationell nivå : En jämförande studie om Sveriges och Norges nationella riskbedömningar
Fenomenet med nationella riskbedömningar är relativt nytt i Europa. Myndigheten för samhällsskydd och beredskap överlämnade den allra första nationella riskbedömningen till regeringen år 2013. Syftet i uppsatsen är att undersöka om man genom ett policy transfer-perspektiv på nationella riskbedömningar kan se några indikatorer som hindrar policy transfer inom riskområdet. En första, översiktlig undersökning görs genom att jämföra de risker man lyfter fram i sju europeiska nationella riskbedömningar för att se om man kan tyda något mönster. Uppsatsen tog avstamp ur antagandet att geografisk närhet och liknande interna förutsättningar kunde tänkas innebära att man även har en liknande syn på risker som länder i ens närområde.
Internprissättning av patent och FoU : samt bevisningsfrågor till följd av dokumentationskravet
As the globalization progresses, the matters of transfer pricing have become essential to multinational enterprises and tax administrations. For states it is important that the transfer pricing is correct to defend their tax base. Incorrect transfer pricing can also have dire effect on the enterprises. They run the risk of both double taxation and tax penalties. Some of the most difficult assets to put a transfer price on are intangibles.
Ny teknik för småskalig kraftvärme : - med fokus på Organisk RankineCykel (ORC)
As a part of the fight against the global warming the energy production needs to be more efficient and redirected towards sustainable options. One alternative is cogeneration, which means that electricity and heat is produced in one plant. The purpose with this survey is to examine if there are any commercial available combined heat and power techniques, based on combustion of solid moist biomass, which are suitable to small-scale applications. The technique must be able to produce between 2 and 10 MW thermal and the heat demand is a Swedish district-heating system. When already published reports had been studied, the Organic Rankine Cycle (ORC) was chosen as the most suitable technique.
Beräkningsalgoritm för fouling i pelletervärmeväxlare inom plasttillverkning
Sweden?s energy consumption is divided into three major sectors. One of them is the industry sector. One third of Sweden?s energy consumption is converted in the industries.
Motor till unikt luftvärmeväxlarsystem
Gtherm is an innovation company who has an unique air heat exchanger underdevelopment. The purpose of this thesis is to provide data of suitable motors for theheat exchanger and to find suitable motor suppliers.A motor specification was designed. It is an important basis for the search of suitablemotors. A compilation was made of nine motor suppliers and the suitable motorsfrom those. The compilation can be used by GTherm in their choice of suppliers andmotors.The compilation of the demands on the motor and analysis of suppliers indicated thatthere were no standard motors available to GTherms air heat exchanger.
Kunskapsöverföring inom studentnationer : En kvalitativ studie av Uppsalas studentnationers överlämningsarbete
AbstractThis study examines how knowledge transfer works within the student nations of Uppsala. The purpose is to describe and analyze how the knowledge is transferred when the officials are being exchanged within the student nation. Furthermore the purpose is to explore if the student nations work active to preserve the knowledge and how it is done in such case. Eight out of Uppsalas thirteen nations are part of the study and the survey was conducted by qualitative interview. The study mainly assumes from Argotes theories on the organizational memory, Davenport and Prusaks theories on knowledge transfer and Nonaka and Konnos SECI-model. The study reveals that the student nations work in different ways and more and less active with knowledge transfer.
Energikonsumtion hos en diskmaskin
The dishwasher is a wide spread product that occurs in many households. It saves the user time,water and energy. When using a dishwasher instead of doing dishes by hand a lot of energy issaved.The importance of lowering the energy consumption does not only come from the consumerwinnings but also from an environmental point of view. Scientists are certain that the globalwarming comes from the emission of green house gasses that is created by human consumptionof oil, gas and coal.Dishwashers today are a lot more energy efficient than older dishwashers, but there are stillmargins to lower the energy consumption. The aim with this project is to investigate thedishwasher and it?s washing cycle, noting different phases and components that contribute towaste of energy.
New Business Model for District Heating Firms Stabilizing the National Energy System with a Future Variable Electricity Production
The aim of this thesis is to develop a new business model for district heating and cooling firms which can contribute to a stabilization of the Swedish national energy system. The business model is developed for a district heating and cooling firm and is exemplified with Fortum Heat. The theoretical investigation around the topic creates a rigid base for following qualitative empirical studies. Osterwalder?s canvas for business model generation is used together with a Casual Loop Diagram to identify a number of business opportunities which stabilizes the national energy system.
VEM V?LJER VINSTEN? P?verkar den politiska f?rgen p? det kommunala styret hur mycket vinst som f?rs ?ver fr?n de kommunala bostadsbolagen?
Every year, Swedish municipalities transfer considerable amounts of profit from public housing companies to the owner municipality. Municipalities are allowed to do this, provided that the money is used to pay for certain purposes. But there are no legal repercussions if they do not comply. Not all municipalities choose to transfer profits. Based on partisan theory, this difference could be explained by the political governance of the municipality.