Remote sensing and on-site measurement are used to determine the heat environment within a community,and are compared the differences for heat analysis. The two methods perform differently for various underlying surfa...Remote sensing and on-site measurement are used to determine the heat environment within a community,and are compared the differences for heat analysis. The two methods perform differently for various underlying surfaces. The individual methods can detect different aspects of the heat environment,which used in combination are useful for heat island research. The differences in estimated air and surface temperatures are smaller in open space and more obvious for vegetated surfaces. Ventilation does not affect the difference between air and surface temperature in open areas,and the vegetation surface and shading moderates surface temperature more effectively than the water surface; The forest is a type of underlying surface with heat comfortable,in which the feeling of air temperature is much difference to the structure of heat environment that should be survey and detected separately. The two methods can be used to study different aspects of the heat environment,thus forming a comprehensive approach for planners in urban and rural spaces.展开更多
为解决在役热交换器能效评价过程中流体介质温度无法测量的难题,本文利用数值模拟技术,模拟45#钢测试段壁厚δ为5、10、15、20 mm 4个壁厚条件下,25~65℃温度范围内测试段外壁温度与流体介质温度之间的函数关系。采用Pt100铂热电阻贴壁...为解决在役热交换器能效评价过程中流体介质温度无法测量的难题,本文利用数值模拟技术,模拟45#钢测试段壁厚δ为5、10、15、20 mm 4个壁厚条件下,25~65℃温度范围内测试段外壁温度与流体介质温度之间的函数关系。采用Pt100铂热电阻贴壁式温度传感器,与直接接触法对同一台板式热交换器同时测量,进行热工性能分析,发现在热流体定性温度为60℃、冷流体定性温度为30℃,冷热流体流速均为0.5 m/s的标准工况下,贴壁式温度传感器测量法与直接接触测量法误差在1.0%范围内。展开更多
基金Sponsored by the National Natural Science Foundation of China(Grant No.51208389)the Fundamental Research Funds for the Central Universities+1 种基金the State Key Lab of Subtropical Building Science,South China University of Technology(Grant No.2010ZA01)the "Eleven-Five" Science and Technology Supporting Project in China
文摘Remote sensing and on-site measurement are used to determine the heat environment within a community,and are compared the differences for heat analysis. The two methods perform differently for various underlying surfaces. The individual methods can detect different aspects of the heat environment,which used in combination are useful for heat island research. The differences in estimated air and surface temperatures are smaller in open space and more obvious for vegetated surfaces. Ventilation does not affect the difference between air and surface temperature in open areas,and the vegetation surface and shading moderates surface temperature more effectively than the water surface; The forest is a type of underlying surface with heat comfortable,in which the feeling of air temperature is much difference to the structure of heat environment that should be survey and detected separately. The two methods can be used to study different aspects of the heat environment,thus forming a comprehensive approach for planners in urban and rural spaces.
文摘为解决在役热交换器能效评价过程中流体介质温度无法测量的难题,本文利用数值模拟技术,模拟45#钢测试段壁厚δ为5、10、15、20 mm 4个壁厚条件下,25~65℃温度范围内测试段外壁温度与流体介质温度之间的函数关系。采用Pt100铂热电阻贴壁式温度传感器,与直接接触法对同一台板式热交换器同时测量,进行热工性能分析,发现在热流体定性温度为60℃、冷流体定性温度为30℃,冷热流体流速均为0.5 m/s的标准工况下,贴壁式温度传感器测量法与直接接触测量法误差在1.0%范围内。
