Język Polski
English
Published
: 2022-09-19
The effect of the structure of rigid polyurethane foams blown with a hydrocarbon blowing agent on foam's apparent thermal conductivity
Abstract
The apparent thermal conductivity (A,z) was measured (Fig. 1) in rigid polyurethane foams (RPURF) blown with a new type blowing agent, viz., a mixture of pentanes (as an alternative to freons), over a broad range of apparent foam densities (p) (Figs. 2, 3). At low p, the Xz vs. p curves exhibited a minimum. Several equations are presented, based on reported theoretical models, which allow to predict X for PUR foams (Table 1). The values predicted for a given foam varied considerably. The equations developed for foams blown with freons were tested in terms of their usefulness to predict Xz for pentanes-blown foams. The RPURF experimental ^2-data were consistent only with the A,-data calculated from equation (4) based on the Glicksman model (Fig. 7). Contributions of individual heat transfer modes (conduction in gas phase, conduction in solid phase, radiation) to the overall heat transfer through the foam were estimated in relation to RPURF density (Fig. 8).
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Dębski, K., Magiem, J., & Pielichowski, J. (2022). The effect of the structure of rigid polyurethane foams blown with a hydrocarbon blowing agent on foam’s apparent thermal conductivity. Polimery, 46(9), 631–637. Retrieved from https://polimery.ichp.vot.pl/index.php/p/article/view/2116
