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Two models, one physical and the other empirical, have been applied to the characterisation of emission data of thin film products tested in small environmental chambers and have been compared in terms of emission results and ease of use. As it is based on equations with coefficients bearing a physical meaning, the physical model is, in principle, more informative than the empirical one. However, it is uncertain whether it always gives accurate and unambiguous results. Moreover, in order to be exploited in a reasonable amount of time, it requires the use of non-linear regression routines implemented on mainframes and, even then, it is often quite difficult to handle. The empirical model does not rely explicitly on physical effects. Although by definition it can only describe but not interpret the experimental data, it does estimate parameters describing the emission with an accuracy comparable to that of the physical model. It is easier to handle than the latter as it can employ non-linear regression routines implemented on personal computers.

Additional information

Authors: COLOMBO A, JRC Ispra (IT);DE BORTOLI M, JRC Ispra (IT)
Bibliographic Reference: Article: International Journal of Indoor Air Quality and Climate, Vol. 2 (1992) pp. 49-57
Record Number: 199211328 / Last updated on: 1994-11-29
Original language: en
Available languages: en
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