Experimental characterization of the coupling and heating performance of a CO2 water-to-water heat pump and a water storage tank for domestic hot water production system

This work presents an experimental study of the dynamic performance a CO2 water-to-water heat pump in domestic hot water production system. A facility was developed and used to characterize time evolution COP this pump, heating stratification processes hot-water storage tank, global Results showed that, when strategies based on promoting reach Ri ?40, such as use vertical tank filling velocities v ? 10-4 m·s?1 with low flow rates between gas cooler, permits increase ?12.4% system reduction ?16% compressor energy consumption compared other strategies. However, considering higher (i.e. ?1) thermal available (?6% rate increases factor 3.6) but enhance mixing extend which reduces Besides, evaporator inlet temperature from 5 °C 20 by 59% ?40%.