Some technical aspects on nonazeotropic mixtures as working fluids

Övrigt konferensbidrag, 1984

In heat pumps with a pure refrigerant as working fluid both the condensation and the evaporation take place at constant temperature, if the pressure drop is neglected. With a nonazeotropic mixture of refrigerants as working fluid, however, the temperature will decrease during the condensation and increase during the evaporation. The heating capacity may in many applications be increased considerably compared with the pure working fluids normally used today. Calculations of the 'ideal relative capacity' with eight mixtures and several pure working fluids have been carried out in six applications. From these calculations it can be concluded that from a heating capacity point of view the mixtures R12/R11, R12/R113, R12/R114, R22/R114 and R13B1/R152a are of special interest.