### Heat exchanger calculations

*Logarithmic mean temperature and theta value*

The logarithmic mean temperature difference, ΔT_{M},
is used as a mean value of ΔT for calculation of the
overall heat transfer.ΔT _{M} is defined as: |

Sometimes the so-called theta value is used to define the
thermal length of a duty and hence the necessary heating surface: |

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Principles of a heat exchanger |

Hydraulic diameter |

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