Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Transient model for the internal pressure of vacuum insulation panels
Submission Author:
Cristiano Tibiriçá , SP
Co-Authors:
Mateus Henrique Corrêa, Cristiano Tibiriçá
Presenter: Cristiano Tibiriçá
doi://10.26678/ABCM.COBEM2023.COB2023-0405
Abstract
Vacuum Insulation Panels (VIP) are a technology of high-performance insulators that consists of a core material at low pressure, usually powders or fibers, and an envelope to protect the core from the outside gases. In order to better model a VIP thermal performance, the core pressure variation along time should be well predicted, including effects of mass transfer, leakage and residual gases trapped inside the panels. In this context, a transient model for the internal pressure was developed and used to compare against experimental data. That model consists on a two control volumes, the internal volume (volume of the measurement system plus the available gas volume of the core) and the trapped gas volume. An experimental setup consisting of a VIP of 200x200x10 cubic millimeters was used for tests. The predicted internal pressure 66 thousand seconds after the beginning of the experiment in comparison with the collected data has shown an error of less than 4%, indicating that the envelope has great effect on the internal pressure. The effective thermal conductivity of 5.5E-3 W/mK was achieved using an appropriated envelope to maintain the core pressure as low as necessary for the tests for a hot side with heat load of 8.1 W, approximately
Keywords
vacuum insulation panels, Leakage, Model, Experiment
