Evaluation and optimisation of energy-efficient heat pump integrated into different applications for simultaneous cooling and heating with alternative refrigerants

Abstract

In this thesis, an innovative compound photovoltaic thermal (PV/T) waste heat–driven ejector heat pump system was developed for simultaneous cooling and heating. The system arrangement combines five promising environmentally friendly technologies: heat pumps, ejectors, PV/T panels, waste heat recovery, and low-global warming potential (GWP) refrigerants. A comparative study of various low-GWP refrigerants was conducted to determine the performance of the proposed system under different conditions and waste heat levels. Initially, the system was combined with different waste heat sources, PV/T systems, milk pasteurisation processes, and data centres, and finally, it was combined with a geothermally actuated organic Rankine cycle to produce a trigeneration system with high performance.