Transient modelling of heat exchangers using a steady-state model for low heat capacity media

Mariusz Granda, Marcin Trojan, Jan Taler and Dawid Taler

Energy, 2025, vol. 327, issue C

Abstract: The paper presents an innovative method for simulating the transients of heat exchangers where fluids with different thermal inertia are considered. The study develops a mathematical model of a double-pipe system in which water and air flow. The discretisation of the spatial derivative of the differential heat conduction equation in cylindrical coordinates was carried out using the FVM (Finite Volume Method). The time solution involves the application of time-marching methods. A novelty is the use of steady-state equations for a fluid with lower thermal inertia, the solution of which is implemented into the system of nonlinear equations of the entire system at each time step. That influences their stable solution at a higher time step value. Studies show that this approach reduces the calculation time from 30 to 50 %. The mathematical modelling was compared with experiment and CFD modelling data. The research has shown that the method accurately obtains the time course of air temperature by approximately 2 %. This approach is becoming increasingly important as the power industry is exposed to unstable operating conditions, which requires additional tracking of power machinery and equipment operating parameters.

Keywords: Heat exchanger; Transient; Mathematical modelling; CFD; FVM; Runge-Kutty (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:327:y:2025:i:c:s0360544225021085

DOI: 10.1016/j.energy.2025.136466

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