When is dynamic simulation of heat exchangers necessary and what are the key considerations?

Dynamic simulation is needed for: control system design and tuning (temperature controllers, bypass control), safety analysis (emergency scenarios, loss of cooling), startup/shutdown procedures, and transient operations (batch processes, load changes). Key considerations: thermal mass of metal and fluids (determines response time), holdup volumes, valve dynamics, heat transfer coefficient variation with flow, and residence time distribution. Simplified models may use lumped parameters; rigorous models discretize along flow path. Validate against plant data for critical applications.