Comparative Study on Temperature of Light Louvred Screen and Reinforced Plastics Screen
Variation characteristics of temperature difference between light louvred screen and reinforced plastic screen are explored by using the minute data from April 2012 to September 2013 in regional automatic weather station in Fengjing of Shanghai, to reveal degrees of temperature difference of the two screens. Temperature difference, daily extremes and the change characteristics of temperature difference under different cloud cover, different heating (cooling) rate, different wind speed, different rainfall intensity and the reason of temperature difference are analyzed with methods of linear analysis, linear fitting and multiple regression. Temperature correction equations for different seasons are calculated. The results show that temperature difference, dispersion of temperature difference and daily extreme difference have seasonal differences. The daily maximum temperature reference value of light louvred screen is lower in spring, summer and autumn. Reference value of high temperature days is lower. Solar radiation and infrared (cooling) radiation have great influences on the temperature difference. The more radiation, the bigger the temperature difference. Single wind condition or single rainfall condition has smaller influence on temperature difference. Under the condition of rain, strong winds and infrared cooling radiation with slow winds increase the temperature difference. The observed value of temperature in light louvred screen is more sensitive to the changes in the environmental temperature. The results show that, the different material and structure make light louvered screen have lower performance of anti radiation, which is the main cause for temperature difference.