Table 1 Comparison between flexible heat pump cycle and two stage heat pump cycles with full subcooling or flash gas removal.
From: A unified approach for the thermodynamic comparison of heat pump cycles
Refrigerant | R410a | R1234ze | R290 | R134a | R32 | R717 |
|---|---|---|---|---|---|---|
\({T}_{{HS}}\) or \({T}_{i}\) (°C) | 39.0 | 34.5 | 35.3 | 34.7 | 36.6 | 32.1 |
Flexible Heat Pump Cycle | ||||||
\(\alpha\) (%) | 24.740 | 20.612 | 19.933 | 19.143 | 16.199 | 7.476 |
\({\varepsilon }_{{flexi}}\) (-) | 0.464 | 0.404 | 0.388 | 0.376 | 0.309 | 0.150 |
Parallel compression with full subcooling (SC) | ||||||
\(\alpha\)(%) | 24.790 | 20.613 | 19.933 | 19.143 | 16.199 | 7.476 |
\(\varepsilon\) (-) | 0.464 | 0.404 | 0.388 | 0.376 | 0.309 | 0.150 |
Parallel compression with flash gas removal (FGR) | ||||||
\(\alpha\)(%) | 24.112 | 20.624 | 19.875 | 19.116 | 15.882 | 7.498 |
\(\varepsilon\)(-) | 0.450 | 0.404 | 0.387 | 0.375 | 0.303 | 0.150 |
