Improvement of Dynamic Modelling for Single-phase Heated Tubes

To improve the currently available multi-segment lumped parameter models, a new dynamic mathematic model for single-phase heated tubes is established by employing equations instead of traditional static calculating heat transfer across control volume’s tube wall. Through separating temporal and spatial terms partial differential equations, combining both analytical methods, an solution temperature distribution steam water in derived. Then, integrating elemental volume release wall are achieved. The improved model, which can be explicitly solved, more stable has much wider applicability. After applying to ultra-supercritical boiler superheater, results show that response characteristics inlet step change significantly improved, during puredelay periods accordance with those distributed models. Compared achieve higher precision even less segments. Besides, transport delay or within analyzedmore accurately model.