Performance of a Conventional Residential Sized Heat Pump Operating with a Nonazeotropic Binary Refrigerant Mixture

摘要

The report presents laboratory performance measurements of a relatively unmodified residential heat pump designed for R22 when charged with a nonazeotropic, binary mixture of R13B1 and R152a. Results are presented for various sizes of fixed expansion devices. The effect of gliding temperature within the saturation zone was found to be small. The experimental investigation confirmed that flash distillation within the accumulator would improve low temperature heating performance. The measured performance was approximately 11% lower in both efficiency and capacity than R22 for air conditioning. The high temperature heating efficiency was 3% lower than R22. The low temperature heating capacity was 14% higher and efficiency 2% higher than R22. These results show a substantial improvement over R22 for heating applications at the expense of reduced cooling mode performance. Further performance enhancement for this or other mixtures is expected through various system modifications which remain to be studied.