In this episode of the Advanced Refrigeration Podcast, hosts Brett Wetzel and Kevin Compass discuss their recent experiences with CO2 refrigeration systems. Kevin shares his adventure working on a random project involving startup support at a union hall in Detroit, describing the process of rewiring and modifying systems for better functionality. The conversation delves into the technical details of a CO2 trainer rack made by ARNeg Canada, including its unique design features and successful operation. Brett also talks about teaching refrigeration classes and answering students' questions. The hosts highlight the intricacies of the refrigeration systems they encountered, including liquid injection, flash gas bypass valves, and the challenges of fluid dynamics in supercritical CO2 systems. The episode is rounded off with humorous banter and insights into the world of advanced refrigeration.