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Abstract
Wood is one kind of material with low thermal conductivity,
poor heat transferring ability, and good thermal insulation.
The purpose of this study was to investigate the thermal
insulation performance of solid wood, wood based material,
thermal insulation material, and inorganic material used as
interior decorative material. The study was also investigated
thermal i
ion methods by using wood based material compounded with other
materials as wall panels. These results will provide as basic
information for house design and "Green Architectures Policy".
This study composed of four major experiments. First of all,
the thermal resistance, thermal conductivity, and overall
thermal resistance of different wall panels which were under dif
method in accordance with the specification of ASTM 236-89.
then step was to study the difference between wood interior
decorated house and non-decorated house, this difference
included interior temperature and humidity, wall temperature
and solar irradiation of all walls. Finally, the heat flow
condition and energy saving efficiency of different composite
wall panels
1. The heat flux and thermal conductivity of wall panel
material increased significantly with increasing temperature
difference on both sides of the panel, however, the thermal
resistance and overall thermal resistance of the material
decreased significantly with increasing temperature difference
on both sides of the panel.
2. The thermal resistance and overall thermal resistance of
wall panel material also increased with increasing thickness,
however, the thermal insulation performance of the material
decreased with increasing thickness.
3. The maximum effective thickness was about 3.3 cm for two
kinds of thermal insulation materials, PS foam and soft PS
foam, under 30℃ difference in temperature.
4. The thermal conductivity of air layer panel was effected by
air convection and decreased with increasing thickness of air
layer.
5. The thermal resistance and overall thermal resistance of
multi-layer air core panel increased rapidly with the number of
layer.
6. The thermal insulation ability and material saving of
composite panel could be improved by applying thermal
insulation material to form 1.0 - 2.0 cm air layer closed to
high temperature side.
7. The total solar irradiation of top floor was the maximum one
among the walls and it was twice as the quantity of eastern and
western walls.
8. The exterior temperature derived by solar irradiation and
exterior air temperature was close to the real recorded surface
temperature of the wall.
9. The interior temperature, humidity, both the temperature and
humidity day difference, and the fluctuation ratios of
temperature and humidity were reduced by applied the wood
interior decoration material.
10. When air conditioner was used, the interior temperature and
humidity fluctuations of the house without wood interior
decoration material was larger than the house with wood
material owing to the fluctuations were stabilized by the
insulation and moisture absorption-desorption properties of
wood.
11. The maximum heat flux flowing into the house was from the
top floor. The total heat flux of House A was about 63-70% of
House B in summer, for example.
12. The maximum temperature difference on both side of the wall
occurred at noon. However, the maximum heat flux flowing into
the house occurred at 15:00 PM. This delayed situation owing
to the large heat capacity of RC wall.
13. Owing to the transparent glass window installed at eastern
wall, the solar radiation was easy to be transferred into the
house through glass. The total heat flux per unit area in a
day could be higher than the top floor. However, the heat flux
through the window could be reduced 90 % off by using 70%
shading rate of the exterior wooded shelves-curtain.
14. The use of air conditioner in hot summer would increase the
temperature difference between indoors and outdoors and
increase the thermal energy and heat flux flowing into the
house.
15. The electricity consumption could be saved up to 11% while
using 0.9cm solid wood of Japanese cedar as interior decorative
material, furthermore, the electricity consumption cloud be
saved up to 24% by applying two 1.1 cm PS panels to top floor
and eastern wall as composite insulation wall.
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