When to use: Visualize the vapor-compression refrigeration cycle on a pressure-enthalpy (P-h) diagram. Adjust evaporating and condensing temperatures, superheat, and subcooling to see how each parameter shifts the cycle, affects compressor work, and changes system COP in real time.
| State | Location | Pressure (psia) | Enthalpy (BTU/lb) | Description |
|---|---|---|---|---|
| ① | Compressor Inlet | 316 | 116.2 | Sat. vapor + 10°F superheat |
| ② | Compressor Outlet | 1548 | 199.6 | Superheated vapor (discharge) |
| ③ | TXV Inlet | 1548 | 50.8 | Sat. liquid − 10°F subcooling |
| ④ | Evaporator Inlet | 316 | 50.8 | Two-phase mixture (flash) |