Abstract
Observations of the Earth climate for the last 100−150 years have revealed that the atmospheric air temperature in the ground level shows quite a rapid growth. Megalopolises and other settlements behave as large sources producing thermal pollution of the Earth air basin. Transport facilities, heated buildings, and heat and electric networks release a significant amount of energy, which accumulates in the air medium of cities and then dissipates into the surrounding space. The most rapid change in the air temperature has been noted for the last 50 years. The greatest increase of the outdoor air temperature, e.g., in St. Petersburg, is observed in the cold period of the year. It has been determined that the average air temperature in the cold period of the year (from October to April) has increased by 1.51°С, whereas the average air temperature increased by 0.72°С for the same interval of time but in the warm period of the year (from May to September), i.e., half as much as in the cold period. It has been found from studies of regulatory and reference documents that the standard climatic data specified in them lag significantly from the currently occurring climate changes. The article presents an analysis of the outdoor air temperatures in St. Petersburg for the period from 1992 to 2021 and an assessment of air temperatures in the coldest day and the coldest 5-day spell with reliabilities of 0.92 and 0.98 and also the absolute minimal air temperature for the considered 30-year interval of time. It is pointed out that the actual climatic indicators derived from statistical processing of daily data arrays are by 3–4°С higher than those specified in the relevant standards. As a result, when buildings are designed for the standard conditions specified by the existing regulations, the contractual loads turn out to be overestimated essentially in comparison with the actual ones, which is revealed in designing the configurations of settlement heat-supply systems. The consideration of actual climatic indicators opens up the possibility to decrease the contractual heat loads of consumers on a sound basis and, as a consequence, to achieve thermal energy saving without degrading the heat-supply quality.
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Mil’kov, D.A., Yuferev, Y.V., Tyutyunnikov, A.I. et al. Climate Change and Its Influence on the Energy Engineering Complex (Taking St. Petersburg as an Example). Therm. Eng. 70, 236–244 (2023). https://doi.org/10.1134/S0040601523030047
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DOI: https://doi.org/10.1134/S0040601523030047