According to the simulation results, the temperature increase
arising on the cold surface after a time of 5 h is only 1 C in
maximum and there has not been any considerable change in the
heat flux. Similar heat flux curves were obtained for all the design
models. This was an expected result because, in the experimental
study, the same result was obtained. On the other hand, in a composite
brick combination composed of EPS and pumice, as the thermal
conductivity coefficient of EPS is too low compared to that of
any other building material like pumice, the dominant thermal
insulation material is EPS. There is therefore no need to use any
other expensive thermal insulation building material together with
EPS just for reducing heat permeability through the brick.
As the density of EPS material is too low to consider in weight,
for the sake of reducing composite brick weight, reducing the
thickness of EPS did not affect the weight of composite brick but
decreased the stress occurring on the brick under load. However,
there has not been any considerable change in the heat flux with
decreasing EPS block thickness. Similar heat flux curves were obtained
for all of the design models.
This is due to the structural properties of EPS. Because approximately
98% air and 2% polystyrene are two substances that form
the EPS foam [30]. Thus, the air that is entrapped within the EPS
foam makes EPS material an excellent heat insulator. Thermal
resistance value of EPS foam is much higher than that of most
materials and increases with the density and reaches its maximum
foam density of 35 kg/m3 [31]. As the density of EPS foam used in
this study is 30 kg/m3, thermal resistance of this composite brick is
therefore rather high. The thermal resistance value also tends to
decrease with temperature increase.
As for the optimum model ensuring minimum brick weight and
cold surface temperature for the models between 1–5 and 6–10 are
found to be model 3 and a model similar to the model 8, respectively
(Figs. 10a and 10b).
According to the simulation results, the temperature increasearising on the cold surface after a time of 5 h is only 1 C inmaximum and there has not been any considerable change in theheat flux. Similar heat flux curves were obtained for all the designmodels. This was an expected result because, in the experimentalstudy, the same result was obtained. On the other hand, in a compositebrick combination composed of EPS and pumice, as the thermalconductivity coefficient of EPS is too low compared to that ofany other building material like pumice, the dominant thermalinsulation material is EPS. There is therefore no need to use anyother expensive thermal insulation building material together withEPS just for reducing heat permeability through the brick.As the density of EPS material is too low to consider in weight,for the sake of reducing composite brick weight, reducing thethickness of EPS did not affect the weight of composite brick butdecreased the stress occurring on the brick under load. However,there has not been any considerable change in the heat flux withdecreasing EPS block thickness. Similar heat flux curves were obtainedfor all of the design models.This is due to the structural properties of EPS. Because approximately98% air and 2% polystyrene are two substances that formthe EPS foam [30]. Thus, the air that is entrapped within the EPSfoam makes EPS material an excellent heat insulator. Thermalresistance value of EPS foam is much higher than that of mostmaterials and increases with the density and reaches its maximumfoam density of 35 kg/m3 [31]. As the density of EPS foam used inthis study is 30 kg/m3, thermal resistance of this composite brick istherefore rather high. The thermal resistance value also tends todecrease with temperature increase.As for the optimum model ensuring minimum brick weight andcold surface temperature for the models between 1–5 and 6–10 arefound to be model 3 and a model similar to the model 8, respectively(Figs. 10a and 10b).
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According to the simulation results, the temperature increase
arising on the cold surface after a time of 5 h is only 1 C in
maximum and there has not been any considerable change in the
heat flux. Similar heat flux curves were obtained for all the design
models. This was an expected result because, in the experimental
study, the same result was obtained. On the other hand, in a composite
brick combination composed of EPS and pumice, as the thermal
conductivity coefficient of EPS is too low compared to that of
any other building material like pumice, the dominant thermal
insulation material is EPS. There is therefore no need to use any
other expensive thermal insulation building material together with
EPS just for reducing heat permeability through the brick.
As the density of EPS material is too low to consider in weight,
for the sake of reducing composite brick weight, reducing the
thickness of EPS did not affect the weight of composite brick but
decreased the stress occurring on the brick under load. However,
there has not been any considerable change in the heat flux with
decreasing EPS block thickness. Similar heat flux curves were obtained
for all of the design models.
This is due to the structural properties of EPS. Because approximately
98% air and 2% polystyrene are two substances that form
the EPS foam [30]. Thus, the air that is entrapped within the EPS
foam makes EPS material an excellent heat insulator. Thermal
resistance value of EPS foam is much higher than that of most
materials and increases with the density and reaches its maximum
foam density of 35 kg/m3 [31]. As the density of EPS foam used in
this study is 30 kg/m3, thermal resistance of this composite brick is
therefore rather high. The thermal resistance value also tends to
decrease with temperature increase.
As for the optimum model ensuring minimum brick weight and
cold surface temperature for the models between 1–5 and 6–10 are
found to be model 3 and a model similar to the model 8, respectively
(Figs. 10a and 10b).
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