Sökning: "heat loss coefficient"
Visar resultat 1 - 5 av 18 avhandlingar innehållade orden heat loss coefficient.
1. Limiting conditions for a sustained flame over condensed fuels : Analysis by experiments and stagnant layer theory
Sammanfattning : Ignition and extinction characteristics of a material determine whether a fire will be initiated and grow. In fire safety engineering, where modellers deal with a multitude of materials, simplified thresholds are commonly used to determine when ignition and extinction occur. LÄS MER
2. Predicting the Long-Term Insulation Performance of District Heating Pipes
Sammanfattning : The aim of the studies that comprise this thesis was to predict the heat loss over timefrom a range of district heating pipes insulated with closed-cells foam. The thermalconductivity of the foam changes over time when it is not diffusion-tight encapsulatedagainst the environment, as diffusion alters the cell gas composition until it reachesequilibrium with the surrounding air. LÄS MER
3. A Statistical Approach to Estimate Thermal Performance and Energy Renovation of Multifamily Buildings : Case study on a Swedish city district
Sammanfattning : Several climate and energy goals have been set in the European Union, one of them being to increase energy efficiency. In Sweden, a large potential for increased energy efficiency lies in the residential and service sectors, which account for about 40% of total energy use. LÄS MER
4. Modeling and Performance Analysis of Alternative Heat Exchangers for Heavy Vehicles
Sammanfattning : Cross flow heat exchangers made from aluminum are common as radiators in vehicles. However, due to the increasing power requirement and the limited available space in vehicles, it is extremely difficult to increase the size of heat exchangers (HEXs) placed in the front of vehicles. LÄS MER
5. Computational Analysis of Heat Transfer and Fluid Flow with Relevance for IC-Engine Cooling
Sammanfattning : Modern IC-engines produce more power per displaced volume and operate at higher combustion pressures and temperatures. In addition, engine structure materials such as aluminium and magnesium alloys, which are more sensitive to thermal loads, are more commonly used. LÄS MER