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βh + βππ + βππ = π β π€ (3.27) where βh is the enthalpy variation, βππ the kinetic energy variation, βππ the potential energy variation, q the specific heat exchanged and w the specific work required in the expansion valve, all in J/kg. The process is assumed to occur without a variation of potential or kinetic energy and the work required is null. Considering an adiabatic expansion valve, the throttling process can then be treated as isenthalpic. With the procedures and assumptions presented in the previous sections 3.1.1. to 3.1.5., the most relevant outputs, such as heating capacity and COP, obtained values within the margin of error of Β±10% when compared to the experimental data, as is represented in Figure 3.6 in the case of the COP. This interval is considered acceptable. The main difference between the modelβs output and the experimental data resides in a lower evaporation pressure, thus lower evaporation temperature in the case of the model. The variation in the discharge temperature reaches +11.2%, mainly due to the necessary approximation of the compressorβs correlation. Figure 3.6. Relative differences of results with experimental data 3.2. SCOP calculation The calculation of the SCOP has been performed following the Standard BS EN 14825:2012 (BSI, 2012). This document provides data to characterize the heating season, and specifically for the colder climate area (identified with Helsinki), the temperature bins β i.e. the number of hours for which every temperature occurs are as seen in the following Figure 3.7. -29-PDF Image | Next generation of refrigerants for residential heat pump systems
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