Estimated pull-down time of a refrigerated hold given initial/target temperatures, cargo mass and cooling capacity.
Formula
$$ t = \frac{m \cdot c_p \cdot \Delta T}{\dot Q_{net}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $m$ | Cargo mass | t | stowage plan |
| $c_p$ | Effective specific heat | kJ/kg·K | ASHRAE Refrigeration |
| $\dot Q_{net}$ | Net cooling rate | kW | plant − heat loss |
Sources
- ASHRAE Refrigeration Handbook.