Determination of the characteristics of the cooling period based on a probabilistic statistical model of the outdoor climate

The relevance of the study is related to the need to have information about the calculated parameters of the outdoor climate in the warm season when choosing the thermal protection of fences in civil buildings equipped with local cooling systems, and the incompleteness of such data in the main regulatory document of the Russian Federation in this area – SP 131.13330.2025 “Building Сlimatology”. The subject of the study is the principles of choosing the average outdoor temperature for the cooling period and determining its duration. The purpose of the study is to obtain a methodology for calculating the degree-day cooling period, taking into account only the data in Table 6.1 SP 131.13330.2025 and information on the intensity of the solar radiation flux in the construction area. The objective of the study is to construct approximation relations for the average outdoor temperature and the duration of the cooling period at the selected boundary temperature of its beginning and end for specific construction areas. A combination of probabilistic and statistical approach with the theory of approximation of functions by generalized polynomials is used, which makes it possible to obtain an analytical expression for the duration and number of degree-days of the cooling period, valid for any settlements within the territory of the Russian Federation. The possibility of constructing a dependence form for the degree-day cooling period in the form of a product of linear and exponential multipliers is shown, based on an analysis of the data obtained earlier by the author on the probability distribution function of the urgent outdoor temperature. The results of the corresponding calculations for the climatic conditions of Moscow and some other cities of Russia are presented. It is noted that the presented dependence gives correct results for the actual values of the parameters and is suitable for use in engineering practice.