Determination of the Enthalpy of Outdoor Air in the Warm Period of the Year with Increased Security

The relevance of the research is related to the need to have information about the calculated parameters of the outdoor climate when designing systems for providing microclimate of civil buildings and the incompleteness of such data in the main regulatory document of the Russian Federation in this area – SP 131.13330.2018. The subject of research is the principles of choosing the enthalpy of outdoor air in the warm period of the year with increased security for the calculation of air conditioning systems. The purpose of the study is to obtain a method for calculating the calculated enthalpy of outdoor air in the warm period of the year, taking into account only the data in table 4.1 of SP 131 with a security exceeding the set for parameters “B”. The task of the study is to identify correlations for climate parameters that are essential for the considered method, and to construct a calculation formula for the enthalpy of outdoor air depending on its accepted temperature. A combination of probabilistic and statistical approach with basic relations of thermodynamics of humid air is used, which allows us to obtain an analytical expression for the enthalpy of the outdoor air supply in excess of adopted for parameters “B”, just within the territory of the Russian Federation. Correlations between the relative humidity content of outdoor air and the difference between the average temperature of the warmest month and the temperature according to the “B” parameters are given, as well as for the correction coefficient to the calculation formula obtained by comparing its results with the map data in The Appendix to the SP, and the accuracy of this coefficient is estimated. It is proved that in conditions close to the parameters “B” and higher, the moisture content of outdoor air when calculating its enthalpy can be assumed independent of security.

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)

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