Performance and Leakage Investigations of Refrigeration and Airconditioning Systems Using Refrigerant Mixtures as Working Fluids

In spite of the advantages of zeotropic refrigerant mixtur~" [1], the industrial >tpplications of mixtures have been very limited up to now. The major problem is seen iu the leakages occuring in refrigeration plants and so a possible change in composition. Another disadvantage is that no simple methods for determination of the concentratiou insick the t:ydc i\rc available. This paper pre$ents the r·esults of iuv(·~Ligations with d. ::.:eu~ ropic mixt.ure of .(i wide boiling point difference in order to evaluate the lllcutioned problem~ \\ill! signiflcctut cfr<~ds hy: leakage cxperirncnts a.nd computcr-~imulat.ion!'l Lo dc1 (Tutiu<' tlw change.• in composition by leakages, simple deterrnination of mixture concentration in the cycle. In conlpa.rison to this n1ixtures with a wide boiling temperature Ji(fereu(:e as a worst ca~e a similar investigation was made with a mixture with smaller boiling point difference as a. real case for the sub;titution of R502 in supermarket systems by a u~wly developed ternary mi:<ture.