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ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
One-dimensional thermo-hydraulic analysis of single-phase coupled natural circulation loops
Submission Author:
Su Jian , RJ
Co-Authors:
Jamer Carneiro, Eneida Regina Guimarães Dourado Ribeiro, Su Jian
Presenter: Su Jian
doi://10.26678/ABCM.ENCIT2022.CIT22-0694
Abstract
Natural circulation has been actively studied due to the use of passive safety systems in nuclear power plants, such as the Passive Residual Heat Removal System (PRHRS) which removes the decay heat from the reactor core by natural circulation without an external power supply. This paper reports a one-dimensional steady-state thermo-hydraulic analysis of a natural circulation system composed of two coupled loops subjected to an inclination angle. Each natural circulation circuit consists of an arbitrary number of straight components of constant hydraulic diameter. As an example, a natural circulation system of two rectangular loops coupled through an intermediate heat exchanger (IHX) is analyzed. The energy equation in each component is solved analytically to determine the temperature distribution, depending on whether the component is a heater, cooler, tube with adiabatic wall, or IHX. All analytical and computational development was implemented using the software Mathematica. Parametric studies of the mass flow rates in the coupled loops were carried out as a function of the angle of inclination, the heating power, and the height of the circuit.
Keywords
natural circulation, thermohydrodynamic model, Coupled circuit
