RT info:eu-repo/semantics/article
T1 Coupling effect in compacted panels based on micronized nanocellular polymers: Modeling of the thermal conductivity
A1 Sánchez Calderon, Ismael
A1 Lizalde Arroyo, Félix
A1 Martín de León, Judith
A1 Rodríguez Pérez, Miguel Ángel
A1 Bernardo García, Victoria
K1 Thermal conductivity
K1 Poly(methyl-methacrylate)
K1 Thermal insulation
K1 Compacted micronized nanocellular polymer
K1 Coupling effect
K1 23 Química
AB Compacted panels based on micronized nanocellular polymers show reduced thermal conductivity in comparison with bulk nanocellular polymers, especially under vacuum, so they are promising materials to be used as vacuum insulation panels (VIP). The discontinuous structure formed by micrometric particles allows for decreasing the conduction through the solid phase since the contact points between the particles act as additional thermal resistances to the heat transmission. However, the discontinuous structure also leads to the appearance of the coupling effect, which cannot be modeled using the typical equations for cellular polymers. In this work, a semi-empirical model able to predict the thermal conductivity of compacted panels based on nanocellular poly(methyl-methacrylate) (PMMA) is developed. The model allows quantifying each heat transfer mechanism contribution (conduction through the solid phase, conduction through the gas phase, radiation, and coupling effect). The model shows that the contribution of the coupling effect in the compacted panels is higher than 50 % of the total thermal conductivity for pressures higher than 5 mbar, supporting the need for the model to correctly predict the insulation performance of these materials. The model predicts minimum thermal conductivities of 32.5 mW/(m·K) at ambient pressure and of 10 mW/(m·K) at maximum vacuum.
PB Elsevier
SN 0735-1933
YR 2025
FD 2025
LK https://uvadoc.uva.es/handle/10324/76986
UL https://uvadoc.uva.es/handle/10324/76986
LA eng
NO International Communications in Heat and Mass Transfer, 2025, vol. 162, p. 108582
NO Producción Científica
DS UVaDOC
RD 15-ago-2025