| Author | Kosit Siwanansakul |
| Call Number | AIT Thesis no. ET-95-04 |
| Subject(s) | Heat--Transmission
|
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of
Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Knowledge and understanding of heat transfer through a roof to an air-conditioned
building have become a necessity in the importance aspect of providing comfort to human being
as well as for the ration use of energy that means benefiting both individual building owners and
the national economy. The mechanism of heat transfer is a dynamic phenomenon influenced by
many factors such as instantaneous solar radiation intensity, the thermal properties of materials,
interior and ambient temperature.
For the most part of the world heat transfer coefficient recommended by ASHRAE is
adequate to use. But this figure will have more accuracy if the experimental study is set up for the
case of a country with low wind speed.
Two types of the roof, the tilted and flat roof made from CPAC Monia tiles and cellocrate
sheet respectively, are used to test with the variations of radiant barrier TYVEK, glass wool and
gypsum board in the case of over purlin, under roof truss or as flat ceiling configurations under
no ventilation or ventilation condition in the working hours. Heat flux and temperature results are
given in graphical and tubular forms. The configuration of radiant barrier as flat ceiling is the best
configuration among over purlin or under roof truss not only no ventilation but also ventilation.
Radiant barrier as flat ceiling under ventilation is the best among other types of testing insulation
material either under ventilation or no ventilation for the tilted roof. Radiant barrier as flat ceiling
under no ventilation is the best among other types of testing insulation material under no
ventilation for the flat roof.
The simulation model using the finite different method program shows qualitative well
prediction for heat flux through roof compared with using the heat flux meter while temperature
prediction using model is fair compared with using thermocouples and the heat flux meter. This
may come from time lagging of measurement using the heat flux meter and the accuracy of the
data logger and the multiplexer due to rainfall coming to the experiment room. |
| Year | 1995 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Energy and Climate Change (Former title: Department of Energy, Environment, and Climate Change (DEECC)) |
| Academic Program/FoS | Energy Technology (ET) |
| Chairperson(s) | Surapong Chirarattananon; |
| Examination Committee(s) | Karmazsin, Etienne;Malik, Arif Saeed;Giap, Van Dang; |
| Scholarship Donor(s) | Royal Thai Government; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1995 |