The influence of 2-methyl-1-pentanol (2MP) on the cooling effect of pilot absorption chiller has been studied experimentally. In one experimental series the additive was injected into LiBr solution. The enhancement ratio up to 20% was observed at the optimum additive concentration. In the second experimental series the additive was injected into the refrigerant. The enhancement ratio became 32% at higher additive concentration. Different additive concentrations have been tested in both series. These experimental results clearly showed that the presence of the additive in the vapour phase, even in very small amounts, favours the enhancement more than the additive in the LiBr solution. Also, it has been noticed, that the additive travels around the absorption cycle during long-term operation.
Les auteurs ont etudie de facon experimentale l'influence de 2-methyle-1-pentanol (2MP) sur l'efficacite d'un refroidisseur d'eau a absorption experimental. Une augmentation de jusqu'a 20% de la performance a ete obtenue a l'aide d'une concentration optimale d'additif. Dans une deuxieme serie, lorsqu'on a injecte l'additif directement dans le frigorigene, une augmentation de la performance de 32% a ete obtenue grace a la concentration d'additif plus elevee. Diverses concentrations d'additif ont ete testees dans ces deux series. Les resultats experimentaux montrent que la presence de l'additif dans la phase vapeur, meme en petites quantites, favorise la performance accrue de facon plus marquee que l'additif dans la solution de bromure de lithium. Les auteurs ont egalement remarque que l'additif se deplace dans le cycle a absorption au cours du fonctionnement de longue duree.