Estimate refrigerant charge from system pipe + component internal volume and refrigerant density at operating states.
Formula
$$ m_\text{charge} = V_\text{liquid-filled} \cdot \rho_\text{liq} + V_\text{vapour-filled} \cdot \rho_\text{vap} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $V_\text{pipe}$ | Pipe internal volume (πD²L/4) | m³ | geometry |
| $\rho_\text{liq}$ | Liquid refrigerant density | kg/m³ | P-h chart |
| $\rho_\text{vap}$ | Suction vapour density | kg/m³ | P-h chart |
Sources
- ASHRAE Handbook - Refrigeration Ch.4.