Study On The Influence Of Window Position And Size On Natural Lighting In Swine Building

In recent years,with the development of pig industry,the small environment inside the swine buildings has been drawn much more attention.The temperature,humidity and light environment have great influence on the small environment of swine buildings.Especially the light environment,which has very important impact on the physiological health of pigs,and natural lighting has many functions that artificial lighting can not replace of,but there's very few study on the natural lighting of swine buildings in China.Thus it's of great significance to study how to improve the natural lighting environment in the swine buildings.This thesis takes the window as the breakthrough point,makes simulated analysis about the natural lighting of swine building with the green ecological building software Ecotect,and explores the influences of window height,window area and window shape on natural lighting in swine buildings,so as to provide theoretical basis for the optimization design of natural lighting in swine buildings.The main work of this thesis,(1)summarizes the present situation of natural lighting in swine building and the lighting problems existing in swine building,also summarizes the research status of natural lighting at domestic and abroad and the related theories of natural lighting design in swine buildings to provide the theoretical basis for the analysis of natural lighting in swine buildings.(2)Makes simulated analysis on the best building orientation of swine building in Changchun area with the lighting simulation software Ecotect,according to the light and climate characteristics of Changchun,we come to the conclusion that the optimum inclination angle of swine buildings in Changchun area is 22.5 degrees in the south by west.(3)Study the difference of the location and the size of windows on natural lighting in swine buildings.Uses the lighting simulation software Ecotect to analyze the three factors' influence on the natural lighting in swine building by changing the single variable(the height of windowsill?the ratio of window to ground and the shape of the window),and to further analyze the influence law of the three factors on natural lighting in swine buildings.And the results indicate that,the better the overall lighting effect can be obtained if window and ground ratio are bigger;the higher the overall lighting uniformity can be obtained if windowsill is higher in height,but the lighting nearby window is not ideal;if the window is wider,the lighting near window is better;the lighting becomes worse if it's far from the window.(4)Verifies the feasibility of applying Ecotect software to analyze the natural lighting of swine buildings.And based on the experimental model of the swine building,the comparisons of the relative error between actual measured data and the simulated data,the standard deviation and the variance,we get the relative error around 15%,which proves the feasibility and credibility that Ecotect can be applied to swine buildings.(5)Tests the optimization design of window lighting in swine buildings.An optimal design scheme for improving natural lighting in the experimental swine building is proposed based on the above conclusions,Taking the experimental swine building as the prototype,to reduce the window height to 500 mm,change the window shape with the width increased to 2000 mm and the height to 1200 mm,and then compares with the prototype,the average illumination value is increased by 32.09 lx,the maximum illumination value is increased by 547.39 lx and the average illumination coefficient is increased by 0.58 %.