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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
HEAT TRANSFER INVESTIGATION FOR A MULTILAYER INSULATION SYSTEM VIA RADIATIVE-CONDUCTIVE APPROACH UNDER LOW TEMPERATURE CONDITIONS IN SPACE
Submission Author:
Guilherme Lacerda , RJ
Co-Authors:
Guilherme Lacerda, Marcos Curi
Presenter: Guilherme Lacerda
doi://10.26678/ABCM.ENCIT2020.CIT20-0559
Abstract
Thermal insulation is an important area, not restricted to mechanical engineering, but widely studied in environmental issues, such as global warming and, above all, energy-saving, since controlling the heat flux on microprocessors through temperature control on components in space applications. This work focuses on controlling the temperature in components that could not lose or gain so much heat in space, especially when the overall safety of sending satellites on specific missions is required. To ensure that, Multilayer Insulation (MLI) is used. With fluid mechanics and radiationconduction heat transfer theory, it was possible to calculate the transient and stationary temperature field and heat flux in MLI. The boundary temperatures are specified at 300K and 4K. The results, from solving the resulting discretized ODE, simulated with fsolve and odeint Scipy subroutines in Python, able to solve the equations numerically, were shown. The data given by the simulation was able to indicate the impacts of varying the layer density, emissivity of screen, the distance between screens and the perforation coefficient in stationary and transient approaches. A way to simulate the performance of MLI numerically was presented. Modifying emissivity showed variations higher than in the perforation coefficient. Layer density controls the distance between layers, changing the conduction heat transfer. In the transient case simulation, it was possible to notice that varying parameters impact in time to reach steady-state and final temperature.
Keywords
Heat transfer, Numerical analysis, Multilayer Insulation, Radiative-conductive approach
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