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arXiv · 2610.41364

Control-Oriented Modeling of Heat Exchangers with Improved Low-Flow Dynamics

Noah Hofmann·Stefan L. Hölzl·Robert Bauer·Martin Steinberger
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Abstract

Existing low-order models of heat exchangers can lose dynamic accuracy at low flow rates, when fluid residence times become significant. This paper proposes two control-oriented models that improve the low-flow performance. The first extends a finite-volume formulation with the first spatial temperature moment, whereas the second uses Chebyshev--Lobatto collocation. Both capture the coupled heat-transfer and transport dynamics and improve the performance when the system behavior is dominated by the inlet-temperature dynamics. At equal state dimension, comparisons with a high-order reference show more accurate delayed outlet-temperature responses while retaining steady-state accuracy.

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Noah Hofmann, Stefan L. Hölzl, Robert Bauer, Martin Steinberger. 2026-10-30. Control-Oriented Modeling of Heat Exchangers with Improved Low-Flow Dynamics. https://arxiv.org/abs/2610.41364

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