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Phase change materials in wallboards for heat management in building applications
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Zhou, Dan, (Researcher in engineering) (2013) Phase change materials in wallboards for heat management in building applications. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b2687567~S1
Abstract
The applications of thermal energy storage with phase change materials (PCMs)
in buildings are studied in this thesis, especially focusing on the PCM wallboard.
Some current applications of thermal energy storage with PCMs in buildings are
reviewed.
The optimal melting temperatures and diurnal heat storage of interior PCM
wallboard and exterior PCM wallboard are theoretically studied. The optimal
melting temperature of an interior PCM wallboard is related to the average room
air temperature and the total radiation absorbed by PCM wallboard. The optimal
melting temperature of an exterior PCM wallboard is related to the average room
air temperature, the average outside temperature and the radiations absorbed
from the inside and outside environment.
The thermal performance of interior and exterior PCM wallboard is numerically
studied by using COMSOL. Some design factors, such as melting temperature,
melting range, latent heat, thermal conductivity and convective heat transfer
coefficients of inner surface and outer surface are qualitatively discussed. The
simulation results are agreed well with the theoretical work. The PCM wallboard
can have a better performance if the thermal conductivity can be enhanced to
around 0.4 W/mK. When designing a PCM wallboard, the convective heat
transfer coefficients should be calculated carefully.
To briefly evaluate the energy consumption and energy saving of PCM
wallboard, a double-room building with normal constructions and PCM
wallboards is modelled using EnergyPlus@.
As most PCMs suffer a common problem of low thermal conductivity, heat
transfer characteristics of PCMs embedded with porous materials are studied.
Paraffin wax RT 27 and calcium chloride hexahydrate are employed as the heat
storage media. The results indicate that the addition of porous materials can
enhance the heat transfer rate of PCMs, especially for metal foams which can
double the overall heat transfer rate during the melting processes. The effect of
mass ratio of expanded graphite on heat transfer is also examined.
Item Type: | Thesis (PhD) | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | ||||
Library of Congress Subject Headings (LCSH): | Materials -- Thermal properties, Phase transformations (Statistical physics), Wallboard -- Thermal properties, Heat storage, Heat -- Transmission, Buildings -- Energy conservation | ||||
Official Date: | April 2013 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | School of Engineering | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Critoph, Robert; Zhao, Changying | ||||
Sponsors: | China-UK Scholarships for Excellence; University of Warwick. School of Engineering | ||||
Extent: | xiv, 170 leaves : illustrations. | ||||
Language: | eng |
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