Sökning: "Space heating and cooling"

Visar resultat 16 - 20 av 51 uppsatser innehållade orden Space heating and cooling.

1. 16. Utvärdering och jämförelse av CO2-kylsystem i en livsmedelsbutik

   Uppsats för yrkesexamina på avancerad nivå,

   Författare :Maria Lööf; [2019]
   Nyckelord :;

   Sammanfattning : Supermarket refrigeration systems are large emitters of high GWP refrigerants, and due to the Montreal protocol and F-gas regulation, which aim to phase out high GWP refrigerants, refrigeration systems with alternative refrigerants must be implemented in order to secure climate friendly and efficient refrigeration. One increasingly more popular alternative is transcritical refrigeration systems using only CO2 as a refrigerant. LÄS MER

3. 17. Techno-Economic Analysis of Solar Photovoltaic and Heat Pump Systems for a North Macedonian Hospital

   Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

   Författare :Francisco Beltran; Lesley Fisher; [2019]
   Nyckelord :ground source heat pump; air source heat pump; ice thermal energy storage.;

   Sammanfattning : The International Energy Agency’s Global Status Report 2017 estimates that existing buildings must undergo deep energy renovations, which reduce the energy intensity of buildings by 50% - 70% in order to achieve the “Beyond 2°C” scenario [1]. Many buildings in Bitola, The Republic of North Macedonia, will need considerable upgrades to meet these goals. LÄS MER

4. 18. Simulation of a scaled down version of a run-around coil heat recovery system on COMSOL® Multiphysics.

   Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

   Författare :Abhimanyu Tyagi; [2019]
   Nyckelord :;

   Sammanfattning : Due to changing anthropological activities, the consumption of resources is continuously increasing. As humans are spending more time indoors, the energy demand is also increasing. The building sector is a major consumer of energy. In buildings, space heating is important to maintain a comfortable space. LÄS MER

5. 19. Future climate resilience of energy-efficient retrofit projects in central Europe

   Master-uppsats, Lunds universitet/Avdelningen för Energi och byggnadsdesign; Lunds universitet/Institutionen för arkitektur och byggd miljö

   Författare :Jonas Manuel Gremmelspacher; Julija Sivolova; [2019]
   Nyckelord :Climate change; Future climate; Climate action; Building Performance Simulations; Hygrothermal Simulations; Moisture; Heating demand; Retrofit; Renovation; Building stock; Residential; Dwellings; Thermal envelope; Heating peak loads; Thermal comfort; Indoor environmental quality; Actual case studies; Big data; Denmark; Germany; Iterative workflow; Weather files.; Technology and Engineering;

   Sammanfattning : This study assesses the performance of buildings affected by climate change under future climate predictions for three time-periods until the end of the 21st century. Objects studied are residential multi-storey buildings, originally built before 1970 and retrofitted during the last decade. LÄS MER

7. 20. Improving thermal fracture resistance in ceramic microcomponents for spacecraft propulsion

   Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Ångström Space Technology Centre (ÅSTC)

   Författare :Erika Åkerfeldt; [2018]
   Nyckelord :HTCC; MEMS; MST; microthruster; thermal fracture;

   Sammanfattning : Because of thermal transients and gradients occurring upon rapid heating or cooling, microcomponents made from High-Temperature Co-fired Ceramics (HTCC) often fail at temperatures far below what the materials can withstand per se. This work investigates how resistance to thermal fracture in HTCC microcomponents can be increased by improving the component design, aiming at increasing the thermal performance of a microthruster with integrated heaters. LÄS MER