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TEWI SCOP Discharge temperature 10% 0% -10% -20% -30% -40% -50% -60% -70% COP VHC Figure 4.19. Summary of evaluated parameters for R152a 4.6.3. R290 The results for R290 are summarised in Figure 4.20. Propane offers the overall lowest TEWI between the alternatives. This is mainly due to its much lower GWP, as the SCOP is subjected to a reduction thus implying a slightly higher indirect effect. The discharge temperatures are significantly lower than with R410A, which could benefit the compressor’s lifetime.The considerably lower VHC would cause the use of higher charge if the heating capacity wants to be preserved. At the lowest temperatures this hydrocarbon has a higher COP than R410A, but undergoes a decline along the temperature range; at the highest temperatures, it obtains the lowest COP. Though, R290 is highly flammable and thus subjected to strict regulations in terms of charge quantity and location of the heat pump. This refrigerant can then be considered as optimal for smaller systems. TEWI SCOP Discharge temperature 0% -10% -20% -30% -40% -50% -60% COP Figure 4.20. Summary of evaluated parameters for R290 -48- VHCPDF Image | Next generation of refrigerants for residential heat pump systems
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