There is a time limit to the length of sunshine, not the longer the better. According to the national regulations, the sunshine standard day is a severe cold day, and the sunshine calculation unit is each household (household), and the sunshine duration is 2 hours. Due to the increasing density of buildings in the city, blocked buildings are generally blocked by multiple buildings, so the time to get sunshine is often discontinuous. Therefore, in order to ensure the sunshine time, the state stipulates that the distance between high-rise residential buildings and various residential buildings behind them should meet the requirement that the effective sunshine time of sheltered residential buildings should not be less than 2 hours in cold weather; In the renovation project of old districts, the effective sunshine time of new houses should not be less than 1 hour in severe cold days. This is a basic standard.

Sunshine conditions in severe cold

As the coldest period of severe cold, the wind is strong, the temperature is low, and the snow on the ground does not melt, so sunshine is a very important key factor. On a cold day, the height of the sun rises to 30 degrees at noon. According to astronomical theory, the higher the sun is, the shorter the shadow is, and the more sunlight shines on the ground. In other words, in cold days, the sun shines more sunlight on the ground than in winter solstice. When the sun is low, the sunlight is easily blocked by buildings on the ground, and less sunlight shines into the room.

Sunshine health care in severe cold

In the severe cold, we should not only go to bed early and get up early, combine work and rest, but also choose appropriate sunbathing according to the specific temperature changes, so as not to catch a cold easily. It is also possible that the sun will bring about changes in hormones in the body, which is more conducive to health, but it is not suitable for sunbathing more, otherwise it is more likely to cause skin diseases. Proper sunbathing is health preservation.

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