Sökning: "Per Lundqvist"

Visar resultat 21 - 25 av 29 avhandlingar innehållade orden Per Lundqvist.

  1. 21. Thermodynamic Cycles using Carbon Dioxide as Working Fluid : CO2 transcritical power cycle study

    Författare :Chen Yang; Lundqvist Per; Carlos Infante Ferreria; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The interest in utilizing the energy in low‐grade heat sources and waste heat is increasing. There is an abundance of such heat sources, but their utilization today is insufficient, mainly due to the limitations of the conventional power cycles in such applications, such as low efficiency, bulky size or moisture at the expansion outlet (e.g. LÄS MER

  3. 22. Energy use and environmental impact from hotels on Adriatic Coast in Croatia : current status and future possibilities for HVAC systems

    Författare :Vlasta Zanki Alujevic; Per Lundqvist; Dagnia Blumberga; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HVAC systems; hotels; energy performance; energy efficiency; environmental savings; energy audit; system approach; sustainable energy systems; Environmental engineering; Miljöteknik;

    Sammanfattning : This thesis analyses a specific type of energy usage system, “energy usage in hotels”, and how this system behaves. In order to evaluate the current state of energy use in hotels, an energy audit questionnaire was developed and conducted among 31,5% of hotels on the Adriatic coast. LÄS MER

  4. 23. Low temperature difference power systems and implications of multi-phase screw expanders in Organic Rankine Cycles

    Författare :Henrik Öhman; Per Lundqvist; Armin Hafner; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energiteknik; Energy Technology;

    Sammanfattning : New and old data on screw expanders operating with 2-phase mixtures in the admission line has been combined to enable the first public correlation of adiabatic expansion efficiency as a function of entry vapour fraction. Although not yet perfected, these findings have enabled an entirely new approach to the design and optimisation of Organic Rankine Cycles, ORCs. LÄS MER

  5. 24. Water Realities and Development Trajectories : Global and Local Agricultural Production Dynamics

    Författare :Mats Lannerstad; Jan Lundqvist; Malin Falkenmark; David Molden; Paul Appasamy; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Agriculture development; food production; per capita food supply; consumptive water use; evaporation; transpiration; hydro-climatic variability; blue water resource; green water resource; irrigation; river depletion; river basin closure; adaptive water management; vegetal and animal foods; Jordbruksutveckling; matproduktion; per capita mattillgång; konsumerande vattenanvändning; evaporation; transpiration; hydroklimatisk variabilitet; blåvattenresurs; grönvattenresurs; bevattning; uttorkning av vattendrag; överintecknade avrinningsområden; anpassad vattenhantering; vegetarisk och animalisk föda.; Water in nature and society; Vatten i natur och samhälle;

    Sammanfattning : Water constraints for humans and nature are gaining more and more public attention as a critical environmental dilemma that needs to be addressed. When aquifers and rivers are running dry, the debate refers to an ongoing “world water crisis”. LÄS MER

  7. 25. Chromatographic characterization of the human red cell glucose transporter Glut1 in the cells, in membrane vesicles and in proteoliposomes

    Författare :Andreas Lundqvist; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biochemistry; Biokemi; Biochemistry; Biokemi; biokemi; Biochemistry;

    Sammanfattning : The human glucose transporter Glut1 is used by many cells, especially red blood cells andbrain cell, to take up glucose and other necessary metabolites. Gentle chromatographic methods can be applied for analyses of Glut1 activities in lipid environments similar to the native one. LÄS MER