DTU Studieprojekt - Passive building temperature regulation with a metal-insulator transition material

Passive building temperature regulation with a metal-insulator transition material

Udbyder
Vejleder
Sted
København og omegn
Background
In standard houses, heat losses via walls and roof accounts for up to 25% of the total energy losses attributable to building fabrics. Significant power losses could be avoided by introducing a self-regulating material in the envelope of the buildings.

Pure vanadium(IV) oxide (VO2) presents an insulator-metal transition around 68oC, which is characterized by sharp changes in optical, electrical, thermal and magnetic properties. Since the transition temperature of VO2 can be lowered to be close to room temperature, this compound could in principle be exploited for regulating the indoors temperature of buildings.

Owing to the latent heat of the phase transition (273 J/cm3), VO2 could in principle also be used as a phase change material for thermal energy storage, which would add to its efficiency for passive thermal regulation.

The background idea of the project is to develop a process for forming a glaze layer containing properly doped VO2 on the surface of bricks or tiles using a chemical solution deposition process. An alternative is to impregnate porous building materials using preformed VO2 particles. With this configuration, we could exploit the changes in optical properties, thermal conductivity as well as the latent heat to improve the thermal efficiency of buildings. Besides development work dealing with the chemistry (the known wet chemistry processes for pure VO2 have to be adapted to allow for doping and compatibility with building materials), there will be measurements on a laboratory scale aiming at characterizing the thermal regulation behavior and heat transmission through coated/impregnated samples under temperature cycling conditions relevant to applications in buildings. Last but not least, the stability (thermal cycling and exposure to ambient conditions) should be tested and the life-cycle as well as potential environmental impacts evaluated.

During this project you are going to:
-Manufacture VO2 films on relevant materials using green chemistry deposition techniques.

-Conduct characterization of your samples by means of X-ray diffraction, optical and electron microscopy, as well as various spectroscopy techniques.

-Conduct thermal analysis experiments to evaluate the performance of your samples in terms of heat absorption/release.

-Analyze your results using theoretical models and compare them with published data.

Learning objectives:
At the end of this project you will be able to:

-Explain the principles of thermal regulation in phase change materials and of its potential applications.

-Use various experimental characterization tools (X-ray diffraction, electron microscopy, thermal analysis, spectroscopy) and explain their basic principles as well as limitations.

-Critically evaluate your results.

-Draw links between processing parameters, microstructure and performance.

-Perform an efficient literature search and compare your own results to published data.

-Present your results to a scientific audience under conditions equivalent to an international conference.

-Write the draft of a scientific publication.

Forudsætninger
Background in chemistry, physics, materials engineering

Emneord

• Energi
• Fysik
• Kemi
• Materialer
• Produktion og ledelse
• Bioenergi
• Brændselsceller
• Elforsyning
• Energieffektivisering
• Energilagring
• Energiproduktion
• Energisystemer
• Kraftværker
• Solenergi
• Vindenergi
• Lasere
• Mikro- og nanoteknologi
• Optik
• Sensorer
• Klimaændringer
• Nanopartikler
• Klimatilpasning
• Miljøkemi
• Innovation og produktudvikling

Navn
Jean-Claude Grivel

Stilling
Seniorforsker

Mail
jean@dtu.dk

Vejleder-info
Bachelor i General Engineering
Vejleder
Jean-Claude Grivel

Type
Bachelorprojekt, Kandidatspeciale

Bachelor i Kemi og Teknologi
Vejleder
Jean-Claude Grivel

Type
Bachelorprojekt, Kandidatspeciale

Bachelor i Fysik og Nanoteknologi
Vejleder
Jean-Claude Grivel

Type
Bachelorprojekt, Kandidatspeciale

Kandidatuddannelsen i Bæredygtig Energi
Vejleder
Jean-Claude Grivel

Type
Bachelorprojekt, Kandidatspeciale