Temperature pull-down time calculator

Estimate the minimum time to cool a product load to its target temperature from the energy balance. Real cooling is slower because heat must travel from the product core to the air.

Load

Product mass (kg)Product specific heat (kJ/kg·K)Commodity-specific; use a published value.Packaging / pallet mass (kg)Packaging specific heat (kJ/kg·K)Check the material (wood, plastic, cardboard).

Temperatures

Entering temperature (°C)Target temperature (°C)

Capacity

Net capacity available to the product (kW)Installed capacity minus transmission, infiltration and internal loads.

Formula and limits

t = (m·cp + m_pack·cp_pack) · (T_in − T_target) ÷ (3600 · Q_net). This is a lower bound: product size, packaging, airflow, stacking and the shrinking temperature difference during cooling all lengthen real pull-down. Use measured cooling trials or a specialist forced-air cooling design for critical produce.

First-pass planning estimate using steady-state formulas and the inputs you enter. It is not an engineering design, certification or supplier quotation; a qualified refrigeration engineer must confirm the design basis. Example inputs are placeholders, not benchmarks.

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