Abstract: A network technique to predict the internal system of flow and heat exchange is presented. Its characteristics are to divide the structure and chamber of the system into corresponding elements and nodes of the network.Various kinds of internal systems could be described by offering only limited kinds of elements and properties of fluids. The calculating method of gradually reducing the remnants of the nodes was used to deal with the network. This technique has significant distinguishing features in universality and simplicity of operation. The calculating process is steady and converges well.

Key words: gas cooling hydr aulic equipment, lubrication systems, computer programs algorithms