Abstract
The air cooler can be used for the cooling of gas turbines and it presents certain difficulties for the calculation model generation. The reason is that the cooling system graph of the-state-of-the-art turbine can consist of 1000 and even more channels. Such large systems are successfully simulated using THA (Thermal & Hydraulic Analysis) Software Package. The method realized by THA for cooling systems can also be used for the air cooler design. However, the inclusion of the heat exchanger into the general diagram considerably complicates the design diagram. In this connection it was recommended to represent the heat exchanger as one channel whose properties totally suit for different types of heat exchangers. To substantiate this approach we analyzed the operation of the tubular heat exchanger with such heat carriers as air-air, air-water and water-water using the THA software package. It was established that the heat exchanger efficiency depends mainly on the relationship of the flow-rate heating power of heat carriers. A slight scatter in the heat exchanger efficiency data is explained by the dependence of thermal and physical properties of heat carriers on the temperature and the pressure. It was noted that the hydraulic resistance coefficient of the heat exchanger depends on the whole on the Reynolds number for which the arbitrary diameter, for example that of the inlet duct can be selected as a characteristic size. The generalizations made allowed us to design the hydraulic network channel of a “heat exchanger” type that imbibes all the basic characteristics of a heat exchanger. Using the THA, we performed in the end the comparative analysis of the detailed and simplified diagrams of heat exchanger; in the latter diagram the heat exchanger was represented as a single channel. We obtained a good coincidence of the computation data and it allowed us to recommend this channel for the diagrams of the cooling systems of gas turbines.
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