The theory of graphs as a potential tool for modeling of combined heat and power plant network elements

The following article provides a brief introduction to the graph theory. It shows two types of models which have been developed using the graph theory. Additionally presented are conservation equations of mass, momentum and energy. The article covers the three elements of the network such as the they are straight pipe and change of the flow direction and a circular arc. These elements are described by the rules of behavior. Identified and described the patterns of loss coefficients.

---

Artykuł stanowi krótkie wprowadzenie do teorii grafów. Przedstawiono w nim dwa rodzaje modeli utworzonych za pomocą teorii grafów. Dodatkowo opisano zasady zachowania masy, pędu i energii. Uwzględniono podstawowe elementy sieci, takie jak rura prosta oraz łuk kołowy i zmiana kierunku przepływu. Elementy te opisano za pomocą zasad zachowania masy, pędu i energii. Określono i opisano wzory na współczynniki strat.