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Solar Assisted Heat Pump with Seasonal Heat Storage

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Solar Assisted Heat Pump with Seasonal Heat Storage ( solar-assisted-heat-pump-with-seasonal-heat-storage )

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Entropy 2021, 23, 47 13 of 17 Figure 10. Monthly averaged heat source temperatures: ambient air, ground, ground water and water inside SHS(STC+GW) and SHS(STC). Looking at the exergy efficiency of the space heating process (Figure 11), it can be seen that systems with SHS(STC) and SHS(STC + GW) have significantly higher efficiencies compared to systems with stand-alone HPs. The lower overall efficiency, especially in the case of the system with SHS(STC + GW), is mainly due to the lower exergy efficiency during SHW production (Figure 12). Systems with HP AW and GW have to raise the temperature of the heat to a much higher level than the system with SHS. Again, there is a trend of reducing the differences in efficiencies between all HP systems, which occurs when the ambient temperature increases (dead state). Figure 11. Monthly averaged exergy efficiencies for space heating of all analyzed systems in relation to monthly averaged ambient air temperature (dead state).

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