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Visar resultat 1 - 5 av 172 avhandlingar som matchar ovanstående sökkriterier.
1. Distributed thermal response tests : New insights on U-pipe and Coaxial heat exchangers in groundwater-filled boreholes
Sammanfattning : U-pipe Borehole Heat Exchangers (BHE) are widely used today in ground source heating and cooling systems in spite of their less than optimal performance. This thesis provides a better understanding on the function of U-pipe BHEs and Investigates alternative methods to reduce the temperature difference between the circulating fluid and the borehole wall, including one thermosyphon and three different types of coaxial BHEs. LÄS MER
2. Thermal Crack Risk Estimation and Material Properties of Young Concrete
Sammanfattning : This thesis presents how to establish a theoretical model to predict risk of thermal cracking in young concrete when cast on ground or an arbitrary construction. The crack risk in young concrete is determined in two steps: 1) calculation of temperature distribution within newly cast concrete and adjacent structure; 2) calculation of stresses caused by thermal and moisture (due to self-desiccation, if drying shrinkage not included) changes in the analyzed structure. LÄS MER
3. Improving the Sustainability Performance of Building Materials: An Approach from Life Cycle Thinking
Sammanfattning : The construction industry is expected to play a vital role in meeting the global societal challenge of ensuring sustainable development. Due to the increasing importance of the embodied impact of materials, this thesis investigates how the sustainability performance of building materials can be improved. LÄS MER
4. Sustainability of Social Housing in the Urban Tropics: A Holistic Development Process for Bamboo-Based Construction
Sammanfattning : This thesis is motivated by a tremendous need for more inclusive, sustainable and disaster resistant social housing in rapidly developing countries such as the Philippines. The 2030 Agenda for Sustainable Development and the New Urban Agenda name the use of local raw materials as one area for action. LÄS MER
5. Functional Fibers for Biomedical and Thermal Management Applications
Sammanfattning : This thesis explores the integration of electrospun polymeric structures in two fields; fibrous scaffolds as cell culture substrates for biomedical applications and fiber carrier networks in metal matrix polymer composites as thermal interface materials in microsystems. Electrospinning has been found to carry great potential for a range of future biomedical engineering applications. LÄS MER