What is the sunshine standard of the severe cold solar terms?

The difference between a severe cold day and a winter solstice is that winter solstice is the shortest day of sunshine, but depending on the orientation of the building, it may not be the shortest day of sunshine in your building. Cold weather is generally the coldest day, and it also needs enough sunshine time.

The sunshine standard of residential buildings in big cities is ≥2 hours in severe cold, ≥ 1 hour in winter solstice, and the sunshine standard of residential buildings for the elderly in winter solstice should not be less than 2 hours. Therefore, winter solstice and severe cold are the best time to test the lighting of houses.

What is the sunshine standard?

Architectural sunshine is an important subject in architectural optics. According to the principle of direct sunlight and sunshine standard, this paper studies the relationship between sunlight and architecture and its application in architecture. The purpose of studying building sunshine is to make full use of sunlight to meet the indoor light environment and health requirements, prevent indoor overheating and meet the needs of building lighting.

For example, kindergartens, nursing homes, hospital wards and other special places need more sunshine. In addition, the calculation of sunshine can't rely on the sunshine spacing coefficient, and the program certified by the Ministry of Construction should be used to simulate the sunshine situation. The sunshine spacing coefficient is a very incomplete design basis. With the popularization of computers, the calculation method has been improved to computer sunshine analysis.