Nowadays, most of the main Heat Pump manufacturers for domestic and commercial/industrial sector offer R744 (CO2) heat pumps for the production of DHW, specially for large consumptions where high temperatures are compulsory to prevent the legionella infections. These HP work better when the DHW storage is stratified in multiple tanks but they have to be sized accordingly. Do you know if it is possible to model the HP somehow in EnergyPlus? There are multiple papers available but I haven't found out how to implement it on EnergyPlus... Thank you in advance!
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