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

•Peltier subcooled trans-critical CO2 cycle is analyzed for heat pump water heating.•The analysis involves thermo-cycle, convective heat transfer and Peltier equations.•Results show an optimal Peltier heating factor exists to obtain the highest COP.•This optimal value increases as the inlet water te...

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