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ο· The charge, in L or m3 The quantity of charge in kg is known from the experimental data, and equals 2.3 kg of R410A. Through its specific volume at the temperature range operated by the machine, the charge in volume was obtained. When considering the other alternative refrigerants, a constant volumetric charge was assumed, in order to obtain different mass values by the means of the specific volumes (Table 3.4). Table 3.4. Charge values by refrigerant Refrigerant R410A R32 R152a R290 R1270 R1234yf R1234ze(E) sp. volume [L/kg] 1.05 1.07 1.15 2.10 0.56 0.91 0.90 Charge [kg] 2.300 2.257 2.100 1.150 4.275 2.657 2.683 ο· The annual heating demand, in kWh The value is calculated from the guidelines given by the is used in order to obtain the energy consumption per year Eannual, in kWh/year, through equation (3.30). Standard BS EN 14825:2012 (BSI, 2012) and πΈ = πππ‘ππ hπππ‘πππ ππππππ ππππ’ππ β ππΆππ (3.30) -32-PDF Image | Next generation of refrigerants for residential heat pump systems
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