PVC/CdS nanocomposites have been prepared by solution casting method taking 2, 4, 6 and 8 wt% of CdS nanoparticles. PVC/CdS nanocomposites were characterized through TEM measurement. The measurement of effective therm...PVC/CdS nanocomposites have been prepared by solution casting method taking 2, 4, 6 and 8 wt% of CdS nanoparticles. PVC/CdS nanocomposites were characterized through TEM measurement. The measurement of effective thermal conductivity of PVC/CdS nanocomposites has also been done using transient plane source (TPS) method. The effects of concentration of CdS nanoparticles and temperature on the effective thermal conductivity of polymer PVC/CdS nanocomposites have been studied. The variation of effective thermal conductivity with the concentration of filler particles and temperature has also been discussed in terms of dispersion of filler particles into polymer matrix and phonon scattering mechanism, respectively.展开更多
为研究等腰梯形蜂窝芯玻璃钢夹芯板传热机制,利用导热仪对夹芯板的传热性能进行了实验测试与模拟研究。结果表明:夹芯板稳态导热系数模拟结果与Swann and Pittman经验公式的计算结果相吻合,验证了数值计算胞体平面模型的合理性;Part2为...为研究等腰梯形蜂窝芯玻璃钢夹芯板传热机制,利用导热仪对夹芯板的传热性能进行了实验测试与模拟研究。结果表明:夹芯板稳态导热系数模拟结果与Swann and Pittman经验公式的计算结果相吻合,验证了数值计算胞体平面模型的合理性;Part2为夹芯板稳态传热的主要构件,Part2胞壁厚度与边长对夹芯板导热系数有显著影响,Part2高度、Part1与Part3厚度及面板厚度对夹芯板导热系数的影响偏弱;同时,若仅需降低夹芯板的导热系数,而忽略对夹芯板静力学性能要求,应该更换蜂窝芯层材料;若需夹芯板同时满足隔热性能与静力学性能,多层蜂窝芯夹芯板是很好的选择。展开更多
The thermal conductivity, thermal diffusivity and heat capacity per unit volume of dunite rocks taken from Chillas near Gilgit, Pakistan have been measured simultaneously using transient plane source technique. The te...The thermal conductivity, thermal diffusivity and heat capacity per unit volume of dunite rocks taken from Chillas near Gilgit, Pakistan have been measured simultaneously using transient plane source technique. The temperature dependence of thermal transport properties is studied in the temperature range 83-303 K. Different relations for the estimation of thermal conductivity are also tested. Thermal conductivity data obey the modified Eucken’s law in the temperature range of measurements.展开更多
Energy consumption in the building sector is constantly increasing and represents more than 44% in the residential and tertiary sectors in many <span><span style="font-family:Verdana;">countries&...Energy consumption in the building sector is constantly increasing and represents more than 44% in the residential and tertiary sectors in many <span><span style="font-family:Verdana;">countries</span><span style="color:#C45911;"> </span></span><span style="font-family:Verdana;">[1]</span><span></span><span><span></span></span><span style="font-family:Verdana;">. Thus, the building represents a real possibility of energy saving and is the subject of several studies particularly in actual context of experimentation</span><span style="font-family:Verdana;"> with materials based on plant fibers (hemp, flax, millet wastage, etc.). These biobased materials such as typha have shown real interest in the buildings construction due to their light and porous nature. It’s in this context that we were interested in typha australis mixed with classic aggregates (cement, sand, gravel 3/8) to make typha’s concrete. On this concrete, we carried out experimental measurements in order to better understand its contributions in the building. The interesting results obtained show that typha australis, which is an invasive and harmful grass, can be valued and integrated among local building materials in the form of typha’s concrete in order to improve the energy efficiency of buildings.</span>展开更多
文摘PVC/CdS nanocomposites have been prepared by solution casting method taking 2, 4, 6 and 8 wt% of CdS nanoparticles. PVC/CdS nanocomposites were characterized through TEM measurement. The measurement of effective thermal conductivity of PVC/CdS nanocomposites has also been done using transient plane source (TPS) method. The effects of concentration of CdS nanoparticles and temperature on the effective thermal conductivity of polymer PVC/CdS nanocomposites have been studied. The variation of effective thermal conductivity with the concentration of filler particles and temperature has also been discussed in terms of dispersion of filler particles into polymer matrix and phonon scattering mechanism, respectively.
文摘为研究等腰梯形蜂窝芯玻璃钢夹芯板传热机制,利用导热仪对夹芯板的传热性能进行了实验测试与模拟研究。结果表明:夹芯板稳态导热系数模拟结果与Swann and Pittman经验公式的计算结果相吻合,验证了数值计算胞体平面模型的合理性;Part2为夹芯板稳态传热的主要构件,Part2胞壁厚度与边长对夹芯板导热系数有显著影响,Part2高度、Part1与Part3厚度及面板厚度对夹芯板导热系数的影响偏弱;同时,若仅需降低夹芯板的导热系数,而忽略对夹芯板静力学性能要求,应该更换蜂窝芯层材料;若需夹芯板同时满足隔热性能与静力学性能,多层蜂窝芯夹芯板是很好的选择。
文摘The thermal conductivity, thermal diffusivity and heat capacity per unit volume of dunite rocks taken from Chillas near Gilgit, Pakistan have been measured simultaneously using transient plane source technique. The temperature dependence of thermal transport properties is studied in the temperature range 83-303 K. Different relations for the estimation of thermal conductivity are also tested. Thermal conductivity data obey the modified Eucken’s law in the temperature range of measurements.
文摘Energy consumption in the building sector is constantly increasing and represents more than 44% in the residential and tertiary sectors in many <span><span style="font-family:Verdana;">countries</span><span style="color:#C45911;"> </span></span><span style="font-family:Verdana;">[1]</span><span></span><span><span></span></span><span style="font-family:Verdana;">. Thus, the building represents a real possibility of energy saving and is the subject of several studies particularly in actual context of experimentation</span><span style="font-family:Verdana;"> with materials based on plant fibers (hemp, flax, millet wastage, etc.). These biobased materials such as typha have shown real interest in the buildings construction due to their light and porous nature. It’s in this context that we were interested in typha australis mixed with classic aggregates (cement, sand, gravel 3/8) to make typha’s concrete. On this concrete, we carried out experimental measurements in order to better understand its contributions in the building. The interesting results obtained show that typha australis, which is an invasive and harmful grass, can be valued and integrated among local building materials in the form of typha’s concrete in order to improve the energy efficiency of buildings.</span>
