Evaluation de la performance saisonniEre de systEmes de production d'eau chaude sanitaire fonctionnant au propane et de pompes A chaleur au CO2
Seasonal performance assessment of sanitary hot water production systems using propane and CO2 heat pumps
Abstract Heat pump water heaters can increase the energy efficiency in sanitary hot water production, which is a relevant share of the final energy consumption in multiresidential and tertiary buildings. Refrigerants for these heat pumps are changing due to the F-Gas Regulation which bans high-GWP fluids. While CO 2 is an established solution, propane is a promising low-GWP alternative for heat pump water heaters serving large users in the tertiary sector, where refrigerant charge limits (due to propane's flammability) can be bypassed by installing the heat pump outdoors. Here, the components of a CO 2 and a propane air-water heat pump systems of 40 kW are sized and their COPs are compared in different climates; then, the two heat pumps are coupled to a storage tank and a user demand profile (hospital and school). For three different locations, tank size necessary to maintain users' comfort and seasonal performance factor are evaluated through simulation. Highlights CO 2 and propane heat pumps for sanitary hot water production are modelled and sized. Their COPs and heating capacities are compared in different climates. A TRNSYS model with a realistic hospital and school load profile is simulated. Propane unit's seasonal performance factor is higher in warm and average climates. Control logic of these systems has a significant impact on energy performance.
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