Sökning: "systemperspektiv"

Visar resultat 11 - 15 av 35 avhandlingar innehållade ordet systemperspektiv.

1. 11. Efficient heat supply and use from an energy-system and climate perspective

   Författare :Maria Danestig; Björn G. Karlsson; Dag Henning; Erik Dotzauer; Linköpings universitet; []
   Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : The aim of this thesis is to illustrate whether the heat demand in district heating systems can be seen as a resource that enables efficient energy utilization, how this can be achieved and to discuss consequences of this assumption. Based on the answers to posed research questions and on the studies included in this thesis, it is concluded that the hypothesis “A common system approach for energy supply and heat demand will show climate and economic efficient solutions” is true. LÄS MER

3. 12. On Gate Drivers and Applications of Normally-ON SiC JFETs

   Författare :Dimosthenis Peftitsis; Hans-Peter Nee; Johann Walter Kolar; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Silicon Carbide; Normally-ON Junction Field-Effect Transistors JFETs ; Gate-Drive Circuits; Protection circuits; High-Efficiency Converters.; Järnvägsgruppen - Elsystem; Järnvägsgruppen - Elsystem;

   Sammanfattning : In this thesis, various issues regarding normally-ON silicon carbide (SiC)Junction Field-Effect Transistors (JFETs) are treated. Silicon carbide powersemiconductor devices are able to operate at higher switching frequencies,higher efficiencies, and higher temperatures compared to silicon counterparts. LÄS MER

4. 13. Complexity and learning in timber frame housing : the case of a solid wood pilot project

   Författare :Ylva Sardén; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Träbyggnad; Timber Structures;

   Sammanfattning : An extensive governmental evaluation of the Swedish construction industry shows that it is possible to reduce production costs in housing construction through industrialisation, customer orientation, and a more efficient construction process. Today large construction companies are more and more focused on dealing with systems and coordinating large projects and the real production is getting less important. LÄS MER

5. 14. Design of Electricity Markets for Efficient Balancing of Wind Power Generation

   Författare :Richard Scharff; Mikael Amelin; Lennart Söder; Hannes Weight; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wind power variations; forecast errors; market design; adjustment markets; trading decisions; continuous intraday trading; variable renewable energy; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : Deploying wind power to a larger extent is one solution to reduce negative environmental impacts of electric power supply. However, various challenges are connected with increasing wind power penetration levels. LÄS MER

7. 15. Energy Efficiency in the Residential, Service and Energy Sectors : Barriers, Drivers and System Studies

   Författare :Stefan Blomqvist; Louise Ödlund; Patrik Rohdin; Erik Dahlquist; Linköpings universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy Efficiency; Barriers; Drivers; System Studies;

   Sammanfattning : Increased energy efficiency is a prerequisite for achieving the national energy and climate goals, the goals set by the European Union, and the Sustainable Development Goals adopted by the United Nations. Close to 40% of Sweden’s total energy use and approximately 20% of domestic greenhouse gas emissions are allocated to the residential and service sector. LÄS MER