Exergy-based analysis of irreversibilities for heat pump working fluids and cycle layouts

The use of zeotropic mixtures in well-designed heat pump cycles enables considerable performance improvements. Temperature glide matching the exchange processes and recovery expansion losses by internal decrease exergy destruction yield higher cycle performances. A case study for supply to district heating is presented, indicating increases COP from 4.3 a pure fluid standard 5.2 mixture with optimised exchange. As these improvement potentials are difficult quantify conventional advanced analysis, new approach was suggested. For deriving meaningful benchmark optimisation, distinguished into contribution describing irreversibilities respective components operating an ideal working design another resulting being non-ideal. In addition, related COP, enabling intuitive interpretation exergy-based analyses.