Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Transient Modeling for the Energy Consumption Prediction in a Portable Refrigerator
Submission Author:
Guilherme Borges Ribeiro , SP , Brazil
Co-Authors:
Luis Guilherme Fonseca Franco, Guilherme Borges Ribeiro
Presenter: Luis Guilherme Fonseca Franco
doi://10.26678/ABCM.COBEM2023.COB2023-0360
Abstract
The energy consumption in refrigerators can be relatively easily calculated by considering the system’s stationary behavior through the balance of mass and energy. However, this analysis proves to be simplistic when attempting to predict consumption closer to reality, as it fails to account for any system failures or sudden changes, causing it to transition from a steady state to a transient state. This can occur simply by opening the refrigerator door. Moreover, in real situations, refrigerators do not constantly operate in a steady state as it would lead to excessive consumption and energy demand. Instead, they operate in time cycles, seeking to maintain temperatures close to those desired by the user. Thus, in order to develop an analysis that is useful in practical terms, and optimize energy consumption in real applications, it is necessary to model the cooling system in a way that does not keep it active for long periods of time, as this does not match reality and does not provide acceptable results for energy consumption. Energy consumption tests are time consuming, and a manner to decrease the time and cost in the product development phase is to predict properly an energy consumption test using well-knowm parameters that could be extracted fro a pull-down test. To study energy thermal conductance of heat exchangers, cabinet and compressor. This work aims to carry out this modeling using the Python programming language primarily, which will enable simulations and production of consumption graphs, using the experimental data. The obtained graphs will allow for the analysis of the temperatures of all components of the refrigeration system as well as the cabinet, as function of the time cycles.
Keywords
Transient regime, modeling, Energy consumption
