Weigh Of Natural Lighting And Air-conditioning’s Energy Consumption In Large Space Of Railway Station’s Public Area

Good natural lighting brings comfortable interior light environment and also save the energy consumption of artificial lighting, but air conditioning and heating energy consumption with the increase of light will have different degrees of increase and decrease. According to the contradictory of natural lighting and air-conditioning energy consumption, this paper will explore the effects on indoor energy consumption structure, which are under different schemes of the window of railway station’s large space public area, and starting from the perspective of building energy efficiency, to balance the natural lighting and air-conditioning energy consumption.Based on discussion of natural lighting and air-conditioning energy consumption, This paper draw the relevant climatic factors which influence the building energy consumption and day lighting. And determine the average January temperature, the average July temperature, relative humidity in July, the total irradiance,CDD18 and HDD26 as the partition index, using hierarchical clustering as the division method, basing on climate data offered by 270 meteorological stations, dividing the country into Ⅰ～Ⅷ eight districts and climatic characteristics were analyzed.According to the characteristics of the space scale and personnel flow of railway passenger station,based on the related research, a medium scale model railway station in large space public area model is set up by the statistical analysis, the model size is 90m×45m×15m. using Ecotect to simulate the effects of the window position, window area, light transmission rate of natural lighting on the indoor average illuminance and average daylight factor, the results show that the effect of two types of the window positions which are the side lighting and the skylight on indoor average illuminance and average daylight factor is very small, but the natural lighting ability of skylight window is better than side window under the same area; In the same direction, indoor average illuminance and average daylight factor increases with the size of window linearly, and so is the relationship between light transmittance coefficient and average daylight factor; through the simulation analysis of three kinds of skylight distribution, the longitudinal strip skylight is better than the transverse strip skylight and middle concentrateion skylight; through the Perez radiation model, the intensity of solar radiation data is converted to the outdoor illumination level and the artificial lighting electricity saving in different daylight factors and window area are given.Using EnergyPlus simulation software, analyzes the influence of the skylight, shading coefficient,heat transfer coefficient, light transmission rate and different ratio of window to wall when side lighting to the air conditioning energy consumption.The results show that,with the increase of skylight and side lighting, the effect of The heat transfer coefficient is very small, the total energy consumption will decreased first and then increased, under the same ratio of skylight, the energy consumption will increase with the increasing of shading coefficient, he energy consumption will decrease with the increasing of transmittance. by analyzing the structure of the total energy consumption, divide the impact AE on total energy consumption of natural lighting into two parts.the AE(1,W) caused by structure change and AE(0,1) caused by indoor light environment change, and establish a method of weigh natural lighting and air-conditioning energy consumption, introduces the process of weigh natural lighting and air-conditioning energy consumption by three specific station buildings as examples.