The Analysis And Research About The Resistance Characteristics Of The Building Window

Reasonable use of natural ventilation can provide fresh air and improve the indoor airquality and save energy at the same time, furthermore it can satisfying the healthy andcomfortable indoor environmental requirements of the people. Window,as a link betweenindoor and outdoor,its shape structure and open manner will directly influence the resistancecharacteristic of it, thus affect the effect of natural ventilation, while its opening styles aremembership of building natural ventilation comprehensive resistance. Therefore, this articletakes the resistance character of the window as a research subject, analyze the value of theflow coefficient and the main influencing factors of it, and then hope to provide help to theuse of natural ventilation of building effectively.First of all, the paper summarizes the research progress about the resistancecharacteristics of natural ventilation, and introduces the basic laws and research methods ofnatural ventilation. We can see that the domestic experts and scholars have made significantachievements in the theory study of the building natural ventilation, but the research about theresistance properties of the window itself is not much, and also not formed the theory andapplication system quantitative results yet, so I think it still need further research andexploration.Secondly, in this paper,through the compare and analyze the test results of wind tunnelwith the numerical calculation model about architecture window resistance characteristic, andthen points out that the wind pressure difference Pbetween window before and after canuse the static pressure difference,and analyzed on how to select the value of the windpressure of the window. According to the experimental condition, we take the numericalcalculation about the different Reynolds number and different opening rate mode, and we canfound that when the Reynolds number over18000, the small opening rate flow coefficienttends to constant, and not increase as the changes of the open rate, the results show that thenumerical calculation results and experimental results are identical with each other.Finally, because the wind tunnel test mainly analyze on the window resistance propertiesof small open hole rate, i.e., window wall rate are no greater than2.25%, so this paper increase the window opening rate, make the discussion on open window resistancecharacteristic, and then analyze the window resistance characteristic of different window wallrate,different flow angle and different window style which is, top-hung window orbottom-hung window.This article through the analysis and numerical calculation about the resistancecharacteristics of the building window, catch the value of flow coefficient on differentwindow conditions, and then hope to provide help to the further research of building openwindow resistance characteristic.