No-Load Baseline Test
Cool the equipment from ambient temperature to -35°C without a load and record the total time taken; for compliant equipment, this duration must be ≤40 minutes. Use a multi-point temperature recorder to simultaneously collect temperature data from various locations within the chamber to verify cooling uniformity.
Full-Load Operational Test
Load the equipment with the rated capacity of standard test materials and insert temperature probes into the center of the materials. Record the time required for the material temperature to drop from 0°C to -18°C, while verifying whether the cooling efficiency meets standards under full-load conditions.
Calculation via Standard Formula
Calculate the precise cooling rate using the formula defined by the International Institute of Refrigeration: V = L/t (where L is the shortest distance from the food surface to the center, and t is the time elapsed for the center to cool to 10°C below the freezing point after the surface reaches 0°C).
Stability Verification Test
Perform repeated tests involving multiple start-stop cycles to confirm that fluctuations in cooling time remain within a reasonable range and that there is no significant performance degradation, thereby verifying cooling stability during long-term operation.
