This assignment examines the regeneration of waste heat from drying air which is discharged from paper machine during the process of paper drying. It also includes an explanation of the basic layout and operation of the paper machine and its components. In addition to the latter, the introduction includes the presentation of the heat exchangers and the general theory of their calculations. A theory of tubular heat exchangers with cross flow is additionally closely examined, that is because those exchangers are used in paper mills for heat regeneration. A mathematical calculation model of tubular heat exchangers with cross flow is performed. With the use of previously mentioned model, calculations for exchanger in the real paper mill were made. Certain specifications were given, such as exchanger’s dimensions, temperatures at the input and the output, and exchanger’s efficiency. In the concluding part of this assignment, a comparison of calculated results is presented with dedicated licensed software packages.
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