Abstract
Four kinds of nonazeotropic mixtures R22/R134a, R22/R142b, R22/R152a and R22/R123, which contain some new halocarbons which are considered to be the alternatives for CFCs, were evaluated in order to realize higher condensing temperature than that using R22 at high temperature operation, and larger heating capacity than that using R22/R114 at normal temperature operation. Isothermal vapor-liquid equilibrium for some of these mixtures was measured by the static method. Selected mixtures were applied to a newly-developed composition changeable rectifying circuit in which the higher-boiling-point refrigerant was separated and stored. As a result, the composition changeable high-temperature heat pump indicated the most effective characteristics when using R22/R142b as the refrigerant.
