Sökning: "twin pipe"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden twin pipe.

  1. 1. HFC-365mfc and cyclopentane as blowing agents in polyurethane insulation of distric heating pipes

    Författare :Sara Mangs; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; 1; 3-pentaflurorbutane; cyclopentane; diffusion; thermal performance; 1; rigid polyurethane foam; twin pipe; 3; HFC-365mfc; 1; district heating;

    Sammanfattning : .... LÄS MER

  3. 2. Environmental and Thermal Performance of District Heating Pipes

    Författare :Morgan Fröling; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; district heat distribution; cyclopentane; district heating pipe; long-term thermal performance; life cycle assessment; insulation; polyurethane foam; environmental performance; carbon dioxide; HFC-365mfc;

    Sammanfattning : In order to move towards a sustainable society we need to increase the efficiency of our use of available resources, not only in economic terms but also in ecological terms. District heating, the utilisation of centrally produced heat for space heating and domestic hot water generation, has the potential to contribute to the eco-efficient use of energy resources in the parts of the world where space heating is needed. LÄS MER

  4. 3. Sparse district heating and flexible district heating pipes

    Författare :Charlotte Reidhav; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; temperature-dependent thermal conductivity; gas diffusion in semi-flexible polyurethane foam; Heating single-family houses; low heat density; new experimental method;

    Sammanfattning : The aim of this thesis is to describe sparse district heating conditions and explore how to improve them. Few sparse areas are heated by district heat, which reflects the economic competitiveness. A method that could be used by the district heating companies to identify the boundaries of profitable district heat is presented. LÄS MER

  5. 4. Towards efficient modeling and simulation of district energy systems

    Författare :Johan Simonsson; Wolfgang Birk; Khalid Atta; Mika Ruusunen; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Automatic Control; Reglerteknik;

    Sammanfattning : Dynamic simulation of district energy systems has an increased importance in the transition towards renewable energy sources, lower temperature district heating grids and waste heat recovery from industrial plants and data centers. However, a city-scale, automatically generated and updated simulator that can be used for the whole lifecycle of the plant remains a distant vision. LÄS MER

  7. 5. District Heating for Residential Areas with Single-Family Housing -with Special Emphasis on Domestic Hot Water Comfort

    Författare :Tommy Persson; Energihushållning; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; low heat density; District heating; single-family housing; domestic hot water comfort; domestic hot water control; heat losses; supply temperature; thermostatic valves; Energiforskning; Energy research; marketing strategies; market penetration;

    Sammanfattning : The concept of district heating (DH) involves centralised heat production where heat is distributed to consumers via a piping network. It is essential that benefits achieved from concentrated, large-scale production instead of local production in each building exceed the costs associated with heat distribution. LÄS MER