Sökning: "HCFC"

Hittade 5 avhandlingar innehållade ordet HCFC.

  1. 1. CFC and HCFC refrigerant retrofit : a theoretical, practical and environmental evaluation of alternatives

    Författare :Lars Herbe; KTH; []
    Nyckelord :Refrigerants;

    Sammanfattning : .... LÄS MER

  3. 2. Phase-out of refrigerant R22

    Författare :Anders Johansson; KTH; []
    Nyckelord :Retrofit; Phase-out; CFC; HCFC; HFC; R22; R407C; R417A; R404A; R134a; Ozone depletion; Zeotropic refrigerant mixture; Circulated composition; Measurement; Energy; Energy efficiency; System; Systems analysis; Modelling; Simulation; Prediction;

    Sammanfattning : .... LÄS MER

  4. 3. HFC Mixtures as Replacement for HCFC-22 in Large-Scale Heat Pumps and Chillers

    Författare :Cecilia Gabrielii; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; R404A; R143a; R125; performance; R134a; R32; replacement; zeotropic HFC mixtures; simulations; design; measurements; chiller; R407C; condenser evaporator; screening; optimization; heat pump; R22;

    Sammanfattning : Replacement of the conventional refrigerant HCFC-22 (R22) is one of the urgent issues to be solved within the scheduled time-frame of the international regulation of the HCFCs. Since there exists no pure fluid that can replace R22 in the same general way as HFC-134a (R134a) is a replacement for CFC-12, HFC mixtures are suggested as possible substitutes. LÄS MER

  5. 4. Non-Azeotropic Mixtures as Working Fluids in Heat Pumps: A theoretical and experimental study

    Författare :Marine Högberg; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HCFC123; HCFC124a; HCFC22; performance comparison; COP; non-azeotropic mixture; capacity; sensitivity analysis; HFC152a; heat pump; CFC114; ethyl chloride; experimental study; HCFC142b; two-stage cycle;

    Sammanfattning : Due to the fact that CFC (Chloro-Fluoro-Carbon) fluids will be forbidden as working fluids in heat pumps for environmental reasons, there is an urgent need for alternatives. As one alternative type of fluid, non-azeotropic mixtures have been suggested. This thesis deals with such mixtures. LÄS MER

  7. 5. Fluorinated hydrocarbons used as refrigerants : toxicokinetics and effects in humans

    Författare :Sara Gunnare; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :;

    Sammanfattning : Hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs) have replaced the chlorofluorocarbons (CFCs) in refrigeration installations and air-conditioning applications. As substitution progressed, some refrigeration mechanics experienced symptoms of inflammation. LÄS MER