Impact Of The Window On The Indoor Optical And Thermal Environment And Building Energy Consumption Of An Industry Building In Wenzhou

The position and size of the window has a significant impact on the indoor optical and thermal environment,and total energy consumption of the building.The design of window has been emphasized for residential building,while ignored for industrial building.In this study,the effect of window on the indoor optical and thermal environment and building energy usage is analyzed.The building in this study,located in Wenzhou province,China,requires air conditioning in summer,heating in winter,and natural ventilation during half season.Firstly,using the CIE standard overcast sky model in Radiance to simulate the natural lighting environment.The effect of window-wall ratio and sill height on natural lighting environment is analyzed.The simulation gives the optimal assumption of 36.3% window-wall ratio and the window height of 1.4 meter.Under these assumptions,34.84% of the total area of the building,which is 2143.97m2,has a 2% coefficient of natural light.Secondly,the DesignBuilder software is used to perform the energy consumption simulation.Conduction transfer function is used to calculate the transient energy through the wall,and heat equation is set to calculate the load.Considering the experiment data and empirical experience,our parameter assumption is adjusted to 36.3% window-wall ratio and the window height of 1.4 meter.The total energy consumption is 51.53 kWh/m2·a,among which 12.66 kWh/m2·a is for illumination,2.63 kWh/m2·a is for heating and 36.24 kWh/m2·a is for cooling.It gives a 48.03% lignting saving rate.Finally,Fluent is used to simulate the natural ventilation process during half season and-(42)? turbulent flow model in RANS is adopted.The result shows,under the circumstance of 36.3% window-wall ratio and 1.4 meter height,the indoor air flow rate is under 0.56 m/s and the age of the air is under 386 s.The ventilation rate is about 8.63/hr and the indoor temperature keeps under 23.1?.It means that in half season,natural ventilation can provide a suitable thermal comfort environment.The work in the thesis could contribute to the development of the window design for industrial building.