A generalized procedure is presented which permits a rapid deter-mination of the core lengths of crossflow gas-to-gas heat exchangers. The inlet states of each fluid, the available pressure drops for each fluid, the required temperature change of one fluid, the fluid heat ca¬pacities, and the core configuration must be prescribed. Core dimensions for two selected core configurations with identical fluid conditions and for one configuration with different fluid conditions are determined from several trial solutions and application of a generalized chart.
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