Heat Exchange with the Surfaces of Envelope Structures of Flat and Cylindrical Shapes

Анотація

Today, the modes of the release of heat energy by functioning systems are not flexible enough and give no way to the maneuvering; these fail to take into account different external factors that influence their operation. To study the specific features of thermal conditions in the premises European and some domestic researchers develop full-scale physical models to artificially simulate external and internal thermal conditions and the special software, however all these methods require the development of appropriate mathematical models. Experimental investigations are efficient, though cost-based and the obtained data reflect just a certain model in laboratory conditions, therefore we had to investigate thermal conditions at changing ambient temperatures and that required performing a preliminary theoretical simulation. A mathematical model was developed to study the specific features of heat-exchange process with the surfaces of envelop structures of flat and cylindrical shapes. The mathematical model was suggested whose task was to measure the temperature of external envelopes and the environmental heat loss provided that the air temperature inside the facility (the room) was constant, depending on the range of external factors and first of all a change in the ambient temperature T = f(t), taking into consideration the operation of heating systems. The model suggested can be used for the investigation of the heat-mass exchange, and comfortable conditions for various structures and facilities with different heating systems.