Turboalgor, in line with European Union directives to eliminate hydrofluorocarbons (HFCs) by 2050, has developed an innovative technology to improve the efficiency of transcritical refrigeration systems. The heart of Turboalgor's innovation is a patented Free Piston Expander (FPE) and its control valve, a device designed to pre-compress the gas leaving the evaporator before it can reach the main compressor. In fact, inside the FPE there is a piston that, using flash gas residual pressure, moves alternately inside a cylinder; thanks to piston motion the gas coming from evaporator is pre-compressed and subsequently sent to main compressor. This reduces the workload of the main compressor, resulting in significant energy savings for the entire system: having 30 °C gas cooler outlet temper ...