The building cooling load is calculated in most standards using the sol-air temperature(T_(sol-air)),which depends on the surface properties and the building configuration.This study presents an experimental and numer...The building cooling load is calculated in most standards using the sol-air temperature(T_(sol-air)),which depends on the surface properties and the building configuration.This study presents an experimental and numerical analysis to find a relationship between the aspect ratio of the courtyard and the T_(sol-air) at different height levels.Besides,the influence of the surface reflection factor on the T_(sol-air) is analyzed.The results show that the T_(sol-air) inside the courtyard differs compared to the usual outside facade.This difference is increased by increasing the aspect ratio of the courtyard and can reach up to 60°C at low levels of the deep courtyards.It is also found that the courtyard geometry is much more important than the thermal behavior of the materials and the T_(sol-air) within the deep courtyard is less affected by the reflection factor of materials.展开更多
文摘The building cooling load is calculated in most standards using the sol-air temperature(T_(sol-air)),which depends on the surface properties and the building configuration.This study presents an experimental and numerical analysis to find a relationship between the aspect ratio of the courtyard and the T_(sol-air) at different height levels.Besides,the influence of the surface reflection factor on the T_(sol-air) is analyzed.The results show that the T_(sol-air) inside the courtyard differs compared to the usual outside facade.This difference is increased by increasing the aspect ratio of the courtyard and can reach up to 60°C at low levels of the deep courtyards.It is also found that the courtyard geometry is much more important than the thermal behavior of the materials and the T_(sol-air) within the deep courtyard is less affected by the reflection factor of materials.
文摘为了得到高性能的双效氧电极,研究了钙钛矿型掺杂LaNiO3电催化剂的溶胶-凝胶制备方法,通过热重- 差热分析、红外分析、XRD分析以及催化剂的粒径分布分析等手段,探讨了pH值、柠檬酸用量以及焙烧制度对催化剂制备的影响.结果表明,制备LaNiO3的溶胶-凝胶法的最佳工艺条件是:柠檬酸的用量为金属离子总物质的量的1.5倍;pH值调节为9;焙烧制度为在750℃下焙烧2 h.
