Ward, Oliver; Galvanin, Federico; Jurado Pontes, Nelia; Clements, Chris; Abdallah, Mohamad; Blackburn, Daniel; Fraga, E; (2023) Lumped-Parameter Heat Exchanger Models for the Robust Dynamic Modelling of Power Generation Cycles. In: PROCEEDINGS OF THE 33 rd European Symposium on Computer Aided Process Engineering (ESCAPE33). Elsevier B.V: Athens, Greece.

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Abstract

In this work, lumped-parameter dynamic models are presented for one-phase and twophase heat exchangers, based on the logarithmic mean temperature difference. These models allow for the more robust simulation of thermal power plants than traditional discretized finite volume models. Comparison of the one-phase lumped model and the finite volume model shows good agreement in the computed outlet temperatures under transient inlet conditions, with steady state differences of <0.15°C. The dynamic responses of outlet temperatures from the models show good agreement, besides a response delay that the lumped model cannot replicate. These models are then implemented in a model of a steam Rankine cycle driven by a source of hot molten salt. The behavior of the system is investigated under a 10% drop in the molten salt mass flow rate, with comparable drops in the main steam pressure, mass flow rate and net power output but a negligible impact on the main steam temperature. The future use of the models is in the design and control optimization of the power conversion system for the STEP fusion power plant being designed by UKAEA.

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