Evaluation of the Use of Different Dedicated Mechanical Subcooling (DMS) Strategies in a Water Source Transcritical CO2 Heat Pump for Space Heating Applications

In this work we analyze numerically different design configurations to be used in a R1234yf DMS cycle coupled with water source, transcritical CO2 heat pump for heating applications the building sector. Specifically, study temperature range proposed by European standard inlet/outlet temperatures of: 30 °C/35 °C, 40 °C/45 47 °C/55 °C and 55 °C/65 °C. Moreover, 25 °C/30 is also analyzed which expected indoor swimming pool applications. A inlet of 10 at evaporator was considered all cases. Results show that depending on coupling strategy between pump, optimal COP values obtained can vary up 30% whereas operating pressure 8%. configuration based splitting flow heated into condenser gas cooler system IHX best option ranges studied. The improvement maximum 5% (for applications) 25% space °C) when compared base considered. When not considered, basic without found option.