Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Modeling and simulation of a cassette fan coil system for efficient cooling in indoor environments
Submission Author:
Flávio Júnior Santiago Silva , PR
Co-Authors:
Flávio Júnior Santiago Silva, Diego de Lima Sousa, Iago Gomes Costa, Anne Defranceschi Oliveira, Carlos Henrique Matiolo, Heloísa da Silva, JOSÉ VIRIATO COELHO VARGAS, André Bellin Mariano
Presenter: Flávio Júnior Santiago Silva
doi://10.26678/ABCM.COBEM2023.COB2023-2122
Abstract
With the development of economy and industry, the demand for energy has increased significantly. The annual energy consumption due to air conditioning and refrigeration equipment corresponds to approximately 10% of the energy produced worldwide. In this context, it has attracted an increasing deal of interest thanks to such advantages as utilization of low-grade heat sources and environment-friendly working fluid pairs. In addition to using working fluids with low environmental impact compared to traditional refrigeration systems, and thereby making absorption refrigerators commercially competitive. This article presents a mathematical modeling of an absorption refrigeration system to simulate the air conditioning of two spaces, with the fan coil system being the main component to be evaluated. The development of the mathematical equations of the model was based on the application of the principles of mass and energy conservation in transient regime for the refrigerator components, reservoir, fan coil, and the environments, where each component was modeled as a simple control volume. The choice of the fan coil system to be evaluated in the model is due to its importance in air conditioning of environments, especially in commercial and residential buildings. After the development of the mathematical model, a computational code was elaborated in Fortran®90 language in order to obtain numerical responses for each control volume and perform analyses based on the parameters of the system. The mathematical model resulted in a system of ordinary differential equations (ODEs), which were solved through time integration with the aid of the Runge-Kutta-Fehlberg method of 4th/5th order, interacting simultaneously. Thus, the mathematical modeling of the fan coil system was able to provide valuable information for the analysis of the refrigeration system performance and its importance in air conditioning of environments. The results of this article demonstrated the profiles of temperature of the thermal fluids in each control volume (CV), as well as the time required for cooling of each one. In addition, a COP of 0.54 was obtained for a cooled space and a COP of 0.25 for two cooled spaces (COP = 0.25). Based on the simulations performed, it was possible to carry out parametric analyses of the fan coil system in relation to COP, allowing the definition of the ideal flow rate for optimal performance of the fan coil in refrigeration of the environments. Therefore, it can be inferred that the proposed mathematical model is a valuable tool for simulation under a variety of operational
Keywords
Refrigeration, fan coil system, mathematical modeling
