Assessment of the Possibility of Excluding Secondary Heating of the Inflow During the Warm Period in Modern Climatic Conditions

The subject of the study is the dependence on the required indoor air temperature and the accepted inflow temperature for a minimum heat and humidity ratio in the room, in which secondary heating of inflow can be excluded. The purpose of the study is to obtain an analytical expression of this dependence, which allows an engineering assessment of the possibility of eliminating secondary heating in the process of designing air conditioning systems without the use of graphical constructions. The objective of the study is to represent an adequate flow processing scheme on the I–d diagram, identify the main factors affecting the minimum heat and humidity ratio in the room and obtain the necessary numerical coefficients in formulas linking the desired and initial parameters. Research results. An analytical dependence is obtained that allows calculating the minimum possible value of the heat and humidity ratio in a room in which secondary heating is not required, and only cooling of the inflow with drying in a surface air cooler is sufficient if it has a bypass channel. The presentation is illustrated with numerical and graphical examples.