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CO2 Heat Pump Performance

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CO2 Heat Pump Performance ( co2-heat-pump-performance )

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Figure 11. COP using different compressor efficiencies (top), pressure drops (middle) and ejector efficiencies (bottom). The green circles indicate where R744 and R410A curves cross. Ta𝒓𝒓ble 3. COP for different heating ratios π‘Ÿπ‘Ÿh𝑒𝑒𝑒𝑒𝑒𝑒 and ejector efficiencies scenarios. 𝐑𝐑𝐑𝐑𝐑𝐑𝐑𝐑 COP [-] (Gain in COP by inclusion of an ejector [%]) [-] 0.0 1.0 5.0 R744 R410A R744 ABC + R744 ABC + R744 ABC + ABC ABC ejector 17 % ejector 25 % ejector 34 % R410A ABC + ejector 17 % 4.44 (1.2 %) 5.12 (0.6 %) 5.42 (1.7 %) R410A ABC + ejector 34 % 4.51 (2.7 %) 5.15 (1.2 %) 5.49 (2.9 %) 4.67 4.39 4.74 5.09 4.10 5.33 4.77 (2.2 %) 4.91 (3.6 %) 4.37 (6.4 %) 4.82 (3.0 %) 4.95 (4.7 %) 4.49 (8.8 %) 4.87 (4.4 %) 5.10 (7.4 %) 4.56 (11.0 %) 12

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