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In this paper a model for Automotive Air Conditioning evaporators is presented, including a comparison between calculated and measured results for two different types of evaporator: tube and fins and plate and fins. The development of the model has been carried out by the Universidad Politécnica de Valencia in co-operation with the Universidad Politécnica de Catalunya and two companies: FASA-RENAULT and FRAPE-BEHR, under a research project supported by the Spanish Agency for R&D: CICYT. The input data for the model are the HEX geometry and the inlet conditions and mass flow rate of both flows. Then the model calculates the outlet conditions and all the performance parameters. The developed model is able to take into account the following aspects of the HE: Tube or plate evaporators as well as any flow configuration: parallel, counter-flow, cross-flow and multi-pass.