How to calculate the sunshine distance between buildings?

Building spacing = 1: 1.2. According to the national regulations (design code), the sunshine time from winter solstice is not less than 1 hour (bottom window of residence). The distance is the height from the outdoor terrace of the building to the eaves of the building /tan(a)a—— the solar altitude angle at noon from winter to Sunday. The control of building spacing is to ensure the quality and safety of people's work and life, and meet the necessary requirements of sunshine hours, lighting, ventilation and sound insulation.

How to see the sunshine time when buying a house?

1, see the house in winter. When the northern hemisphere enters winter, the direct sunlight area turns to the southern hemisphere, and the sunshine angle in winter is the smallest. In other words, the shadow of the building drags the longest in winter. So, if you find that the lighting effect of the house is very good during the day in winter, then don't worry about it in other seasons.

2. Look at the house in the morning. When the weather is fine in the morning, it is best to look at the lighting performance of residential buildings. If there is no sunshine in the morning 1 1, it means that the lighting is not good. For units with rooms or living rooms facing west, if you go to see them in the afternoon, you can find out whether the sun facing west is within the acceptable range.

3. Look at the blank room instead of the model room. Look at the lighting performance of the house, try to look at the rough house, because this can eliminate the interference of lighting, partition and other factors, and truly see the lighting effect of the house.

Look at the depth and width of this house. Outdoor sunlight generally shoots into the room from the window or balcony partition door, and weakens with the increase of depth, so the natural lighting of households with excessive depth is bound to be relatively poor. Consider the depth of the banlou. If the depth is too large and the width is too short, it will have an adverse impact on lighting.

5. Look at the building spacing coefficient. The building spacing coefficient is directly related to the lighting relationship between adjacent buildings. Regarding the sunshine standard and building spacing of residential buildings, the "Building Lighting Design Standard" and "Residential Design Code" published by the Ministry of Housing and Urban-Rural Development have corresponding provisions. If you get the relevant data of specific buildings, and then compare with the above regulations, it is worry-free to meet the requirements of lighting.

6. Look at the floor height. Simply put, if it is multi-layered, it is better to have 3-4 layers. If it is high-rise, it is better to be 1/3-2/3 of the total number of floors, and the lighting and air are better.

7. Look at the specific direction. When buying a house, the main room should have good direct lighting. The living room, dining room, bedroom and other main living spaces of the house face south or southeast, with good lighting. Of course, if you occupy two directions of residential buildings, such as the north and south of plate-type houses, the east and west of tower houses, the lighting will be better.