Nonazeotropic mixtures of at least three compounds which can be employed in thermodynamic compression cycles

摘要

Nonazeotropic mixtures of fluids which can be employed in thermodynamic compression cycles, for example in heat pumps comprising R23, R11 and at least one fluid c chosen from the group made up of the halogenated compounds of methane and ethane which have a boiling point of -85 to +60 DEG C, excluding R23, R11 and R142b in molar proportions such that the molar ratio R23/R11 is from 0.1:1 to 1.2:1 and the molar ratio R23 + R11 / R23 + R11 + C is from 0.20:1 to 0.5:1. Mixtures of the invention can be employed as working fluid for heat pumps in which the fluid circulates in an evaporator E1, a compressor K1, a condenser E2 and an expansion valve D1. The heat exchanges take place with the external fluids 5, 6 and 7, 8 respectively. The mixtures of the invention make it possible to supply heat to the condenser at a temperature of +50 to +100 DEG C while having an internal pressure limited to 0.3 MPa. IMAGE