Simulación de un intercambiador de calor para almacenamiento de energía térmica mediante el uso de materiales de cambio de fase: simulación de un intercambiador de calor para almacenamiento de energía térmica a baja temperatura.

Abstract

Thermal energy storage is one of the methods used to get the most out of an energy source, with the aim of reducing energy costs and reducing the carbon footprint. The means to store thermal energy are latent heat and sensible heat, in the case of latent heat a phase change material known as PCM is required, these compounds absorb and release large amounts of energy during its phase change. One of the equipment used for energy storage and transfer are heat exchangers due to their versatility. Based on this context, this work aims to perform a CFD simulation of a shell and tube heat exchanger that uses isopropyl palmetto as PCM inside the pipes and air as heating and cooling fluid. For generate the simulation, in the first instance, a bibliographic review of the different commercial software that allows CFD simulations was carried out, later the ANSYS FLUENT program was chosen to carry out the geometry of the shell and tube heat exchanger based on the established dimensions. In the curricular integration work carried out by Ortiz in 2022, the simulation of the PCM loading and unloading process was executed in this software. The PCM loading and unloading times were established, which are: 7700 seconds and 22000 seconds, respectively, the fluid pressure drops within the equipment, the air outlet temperatures during the charging process were also obtained from the simulation. and discharge, which are: 291.5 K and 281.5 K, respectively, and the total energy transferred from the PCM to the air and vice versa was determined, these energies are equal to 44012.5 kJ and 24787.84 kJ, respectively.