Study On Daylighting And Energy Consumption Of Side-Window In Public Building

Architectures in our country are now in a large build. The light and heat environment of Residential building has been researched concretely, but public building hasn't received recognition. Most domestic studies on day lighting are only limited to qualitative analysis with the consideration of aesthetics effect, and no detailed and systematical quantitative study on daylight utilization with the combination of day lighting and building energy consumption. Thus architects can get a conclusive mind of these.The analysis includes the influences on indoor daylight distribution, energy consumption of cooling and heating and their relationship. More detailed information about the thesis is as follows.1. In this study, we use AGI32, IESNA partly cloudy sky model for relative precise estimation of indoor day lighting distribution. Numerical simulation is used to analyze the key factors affecting day lighting,such as other buildings, the floor of the building, time of the simulation. Based on the same model made for energy consumption simulation, calculations and analysis what the ratio of glazing to floor area is to get the best illuminance and uniformity of daylighting, when we use different width,length,height,figuration and orientation. We give the regression curve of the ratio of glazing to floor area that each affecting factor are obtained.2. The Energy Design Standard and lighting design Standard has different tendency in the area of window. The Energy Design Standard area of windows makes great influence to air condition load. And lighting design Standard point that great area of windows give good lighting circulation. This article use DeST to simulate the air condition when use low-e glass, general middle-hollow glass, and single glass to see if the glass can change the standard pointed condition, to see if bigger area of window can make greater air condition load. The result is that single glass obeys the discipline, and middle-hollow glass has no different when the area of window changed. Low-e glass can make fewer loads when use bigger windows.3. Though we use the best the ratio of glazing to floor area, there are also many question such as uniformity of day lighting, the decline of the illuminace along the length of the room and the glare. We give some component like shift and louver that can save large amount of lighting, heating and cooling energy consumption, which can also improve day lighting quality. We emphasis calculate the energy saving when use sun shading board.With the combination of lighting, cooling and heating under day lighting, the effect of the key characteristic parameters on total energy consumption is provided in this thesis.1 The illuminance of reference surface has declined rapidly where the length is 1.1-1.3 times of the window height。We'd better take different control system from there to saving lighting energy.2 The uniform of daylighting is different when the form of window changed. Windows that length is longer have worse uniformity in the same square.3 The window is bigger the average of illuminance is better. In north, west and east, the uniformity of day lighting has the same trend. South room is not conforming to this trend when the room length is less than 6m.4 Energy consumption change little when the area of window changed if we use middle-hollow glass, so architects can consider daylighting more in their design.