The idea of evaluating refrigeration equipment and the practical performance evaluation indexes of quick-freezers, namely energy utilisation efficiency, efficiency of airflow organisation, and uniform coefficient of airflow organisation, were suggested to compare the performances and to diagnose the existing problems for freezers. Based on the measurement, the performance evaluation indexes were applied to the performance analysis and the improvement for LSI 1500 spiral quick-freezer, the problem with LSI 1500 spiral quick-freezer was detected and the improved spiral quick-freezer LSI 1500A with the higher performance was achieved. It was proved that the suggested evaluation indexes are the effective tools in the food refrigeration industry.
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