As a result of growing environmental awareness - at least in the form of verbal statements - there is a consensus about the importance of applying water conservation type cooling systems. In practice, however, their application is still far behind that of the water-thirsty cooling methods. This paper introduces one of the proven dry cooling: the advanced Heller system (an indirect dry cooling) and its dry/wet derivatives. Besides giving a basic technical and environmental review, results of some economic case studies are also presented. These show how a natural draft Heller system can extend the economic viability of water conservation type cooling systems as compared to wet cooling.
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