Selection of the Design Outdoor Air Temperature in the Cold Period of the Year With Reasonable Security

The relevance of the study is the need to have information on the estimated parameters of the outdoor climate in the design of HVAC systems in civil buildings, and with the incompleteness of such data mainly normative document of the Russian Federation in this area – SP 131.13330.2018 that becomes significant when the observed climate warming. The subject of the study is the principles of choosing the outdoor air temperature in the cold period of the year with decreased security for the calculation of heating, ventilation and air conditioning systems. The purpose of the study is to obtain a method for calculating the calculated temperature in the cold period of the year, taking into account only the data in Table 3.1 of SP 131, with substantiated security which can be lower than the one set for parameters “B”. The research objective is to construct approximate relations for the outdoor temperature depending on its required availability and to obtain the values of the parameters included in these relations for specific construction areas. A combination of probabilistic-statistical modelling to the theory of approximation of functions and to the linear algebra methods is used, which allows to obtain an analytical expression for the calculated ambient air temperature when security will lower than adopted for the parameters “B” are applicable to all settlements within the territory of the Russian Federation. The justification of the required coefficient of security of the average temperature of the coldest five-day period is proposed, taking into account the limitation of the possible insecurity of the parameters of the internal microclimate at a level corresponding to the insecurity characteristic of other engineering systems of the building, using the example of an internal water supply system. An engineering method for calculating the value of the calculated outdoor temperature with the specified security is presented on the basis of a probabilistic and statistical model of the outdoor climate developed earlier by the author using existing climatic data contained in SP 131.13330. The presentation is illustrated with numerical and graphical examples.

O.D. SAMARIN, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

National Research Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)

1. Umnyakova N.P. Climatic parameters of typical year for thermal engineering calculations. BST: Byulleten’ stroitel’noy tekhniki. 2016. No. 8 (984), pp. 48–51. (In  Russian).
2. Malyavina E.G, Malikova O.Yu., Fam V.L. Method for selection of design temperatures and outside air enthalpy during warm period of the year. AVOK. 2018. No. 3, pp. 60–69. (In Russian).
3. Malyavina E.G., Lyong F.V. Choice of the outdoor air design temperature and enthalpy according to the given provisions. SOK. 2017. No. 12 (192), pp. 74–76. (In Russian).
4. Guzhov S.V., Penkin P.A. Method of calculating the need for heat energy by Anadyr city. SOK. 2019. No. 12 (214), pp. 78–79. (In Russian).
5. Gaujena B., Borodinecs A., Zemitis J., Prozuments A. Influence of building envelope thermal mass on heating design temperature. IOP Conference Series: Materials Science and Engineering. 2015. Vol. 96 (1), pp. 012031.
6. Odineca T., Borodinecs A., Korjakins A., Zajecs D. The impacts of the exterior glazed structures and orientation on the energy consumption of the building. IOP Conference Series: Earth and Environmental Science. 2019. Vol. 290 (1), pp. 012105.
7. Belussi L., Barozzi B., Bellazzi A., Danza L., Devitofrancesco A., Ghellere M., Guazzi G., Meroni I., Salamone F., Scamoni F., Scrosati C., Fanciulli C. A review of performance of zero energy buildings and energy efficiency solutions. Journal of Building Engineering. 2019. Vol. 25, pp. 100772.
8. Bogoslovsky V.N. Stroitel’naya teplofizika [Building thermal physics]. Saint Petersburg: AVOK SEVERO-ZAPAD. 2006. 400 p. (In Russian).
9. Samarin O.D. Gidravlicheskie raschety inzhenernykh system [Hydraulic calculations of engineering systems]. Moscow: ASV. 2020. 144 p.
10. Samarin O., Paulauskaite S., Valancius K., Ciuprinskas K. Selection of the climate parameters for a building envelopes and indoor climate systems design. Science – Future of Lithuania. 2017. No. 9 (4), pp. 436–441.
11. Samarin O.D. The probabilistic-statistical modeling of the external climate in the cooling period. Magazine of civil engineering. 2017. No. 5, pp. 62–69.