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Thermal Storage Modeling of One Building with and Without Phase Change Materials

Ebrahimi Shourkaei, Milad | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47433 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Farhadi, Fathollah
  7. Abstract:
  8. Phase change materials have been of great interest due to their ability to save and restore energy in low temperature ranges. PCM can save and release energy in a constant temperature which leads to save in energy. These materials have been widely used in solar cells, storage tanks, human body and buildings. Applications of PCMs have been discussed in the last chapter of this thesis. To study the effect of PCM, a room with bricks, chalk, insulator and also PCM is assumed. Abovementioned room in summer and winter of Tehran with south-north and west-east walls has been simulated in COMSOL. Effects of air’s convection in the room and brick’s holes have been investigated in simulation and results have shown that air flow should be assumed for simulation. Also, the effects of melting point, latent heat, melting temperature range and conduction coefficient of PCM on the average temperature of room have been studied and simulation for summer weather of Tehran showed 36 0c, 100 Kj/Kg, 4 0c and conduction coefficient range of 0.15 to 0.5 watt per meter kelvin respectively. For Boushehr, the above-mentioned parameters are 36 0c , 299 Kj/kg , 1 to 4 0c and 0.15 to 0.5 respectively. For summer weather of Tehran , by using PCM in north-south walls more saving in energy than in east-west walls is obtained.
    Simulation for winter weathers in Tehran does not show significant temperature fluctuation. The best position to place PCM is the ceiling in which the heat transfer with environment is maximum. However, better performance can be observed by placing PCM in both ceiling and walls in layer or brick holes nearer to the environment. If the holes of brick are rectangular, it would be better if the hole’s height is 1.5 times of its width to gain best results, but circular holes are better than rectangular holes
  9. Keywords:
  10. Energy Conservation ; Simulation ; Buildings ; Melting Point ; Phase Change Material (PCMs) ; Latent Heat ; Tehran's Weather

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