Heat integration in batch processes including heat streams with time dependent temperature progression

• Existing models for heat integration of batch processes have been investigated.
• Inaccuracies for the existing models monitored when dynamic heat streams occur.
• Time-Temperature-Interval-Model introduced to overcome these limitations.
• Time-Temperature-Interval-Model applied to literature process.
• Comparison of the models and recommendation for their application.

Time Slice Model (TSM) is an existing model suitable to identify the potential for heat integration in batch processes. However, heat streams occurring during a heating or cooling process in a batch vessel cannot be depicted rigorously due to their time dependent temperature profile. Yet such streams can frequently be found in batch processes. Ignoring the temporal dependence of the temperature can lead to inaccurate heat integration targets. In this publication, necessity for the inclusion of time dependent heat streams is illustrated and drawbacks of existing approaches are demonstrated. A methodology for considering heat streams with temperature profiles in TSM is presented and it is demonstrated that introducing additional time slices allow prediction of integration potential without accuracy loss.