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Refrigeration Pull-Down Time

Estimated pull-down time of a refrigerated hold given initial/target temperatures, cargo mass and cooling capacity.

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Formula, assumptions, and limits

t=mcpΔTQ˙nett = \frac{m \cdot c_p \cdot \Delta T}{\dot Q_{net}}
SymbolMeaningUnit
mmCargo masst
cpc_pEffective specific heatkJ/kg·K
Q˙net\dot Q_{net}Net cooling ratekW

Source: ASHRAE Refrigeration Handbook

In short

Estimated pull-down time of a refrigerated hold given initial/target temperatures, cargo mass and cooling capacity.

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