Application of the Peltier sub-cooled trans-critical carbon dioxide heat pump system for water heating – Modelling and performance analysis

摘要: Abstract Although the Peltier sub-cooled trans-critical CO2 cycle concept has been applied for refrigeration, which typically involves discharging heat into ambient air, this system is rarely considered pumping purposes. Therefore, research aims to expand scope of pump water heating where generated uniquely discharged at temperatures progressively higher than ambient. The flows between and flowing are modelled as Nusselt based convective transfers a 1D model imposed direct gas cooler improve simulation accuracy. Moreover, important but often neglected characteristics such device size factor (PHF) will also be analyzed. Results indicate that PHF an extremely strong influence on overall system’s coefficient performance (COP). Specifically, optimal value exists trade-off benefit sub-cooling losses due reduced mass flow rate, latter caused reductions in transfer cooler’s capacity. In meantime, although larger sizes improves COP, improvement converge towards specific maximum.