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Thermal conductivity of polyurethane foams

Tipo de material: TextoTextoSeries ; International Journal of Heat and Mass Transfer, 42(12), p.2211-2217, 1999Trabajos contenidos:
  • Wu, J.-W
  • Sung, W-F
  • Chu, H.S
Recursos en línea: Resumen: The thermal conductivity of polyurethane "PU# foams at gas pressure between 659 torr and 9[903 torr is investigated theoretically and experimentally[ Six di}erent cell sizes ranging from 049 to 249 mm of PU foam insulation are used as the samples[ Experimental results are also obtained for the spectral extinction coe.cient using a Fourier transform infrared spectrometer[ The thermal conductivity of PU foams for di}erent cell sizes at 659 torr varies from 22[2 to 23[4 mW:m K, and reduces to 5[71-8[04 mW:m K at a gas pressure of 9[903 torr^ the e}ective thermal conductivity decreases when the cell size becomes smaller[ At gas pressure 9[903 torr; radiative heat transfer accounts for approximately 19)of the total heat transfer through PU foams, while solid conduction accounts for the other 80 percent
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The thermal conductivity of polyurethane "PU# foams at gas pressure between 659 torr and 9[903 torr is investigated theoretically and experimentally[ Six di}erent cell sizes ranging from 049 to 249 mm of PU foam insulation are used as the samples[ Experimental results are also obtained for the spectral extinction coe.cient using a Fourier transform infrared spectrometer[ The thermal conductivity of PU foams for di}erent cell sizes at 659 torr varies from 22[2 to 23[4 mW:m K, and reduces to 5[71-8[04 mW:m K at a gas pressure of 9[903 torr^ the e}ective thermal conductivity decreases when the cell size becomes smaller[ At gas pressure 9[903 torr; radiative heat transfer accounts for approximately 19)of the total heat transfer through PU foams, while solid conduction accounts for the other 80 percent

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