Abstract
The chlorofluorocarbon has been used for foaming agents because of its low thermal conductivity. Research Institute of Innovative Technology for the Earth (RITE) examined the replacements which does not include chlorine. Hydro-fluoro-ethers (HFEs) and hydro-fluoro-ketones (HFKs) were synthesized, and the thermal properties were measured. The thermal conductivity of gas was measured, and it was summarized in a database. We built estimation equation of a gas thermal conductivity of organic compounds that can use from CFC to normal hydrocarbon compound. We used polynomial expansion type of estimation equation and decided the coefficients with genetic algorithm. From cross-validation result, our polynomial expansion type of estimation equation predicted the thermal conductivity of gas with correlative coefficient R2=0.996. We also showed that we could design structure to make thermal conductivity small when we used this estimation equation reversely.
