Alternative refrigerants have been used in refrigerating and air-conditioning systemsdue to the phase out of CFC-12, HCFC-22 and R502 etc. Most of them are mixtures.The composition fractionation and thermal performanc...Alternative refrigerants have been used in refrigerating and air-conditioning systemsdue to the phase out of CFC-12, HCFC-22 and R502 etc. Most of them are mixtures.The composition fractionation and thermal performance change during refrigerant leakedout from system must be paid attention. The compositions of mixture THR02 were mea-sured by gas chromatographic analysis. Then we developed a general model to calculate thecomposition fractionation of zeotropic, near-azeotropic and azeotropic mixtures. The max-imum deviations between the calculated compositions and experimental results are within5% for the mixture THR02, R4O7C, R404A and R507. THR02 is a near-azeotropic mixture,it is remain unflammable under the worst case, and the change of system performance onlyresulted from composition fractionation during refrigerant leakage can be neglected.展开更多
文摘Alternative refrigerants have been used in refrigerating and air-conditioning systemsdue to the phase out of CFC-12, HCFC-22 and R502 etc. Most of them are mixtures.The composition fractionation and thermal performance change during refrigerant leakedout from system must be paid attention. The compositions of mixture THR02 were mea-sured by gas chromatographic analysis. Then we developed a general model to calculate thecomposition fractionation of zeotropic, near-azeotropic and azeotropic mixtures. The max-imum deviations between the calculated compositions and experimental results are within5% for the mixture THR02, R4O7C, R404A and R507. THR02 is a near-azeotropic mixture,it is remain unflammable under the worst case, and the change of system performance onlyresulted from composition fractionation during refrigerant leakage can be neglected.
