Efficiency of pre-cooling system on some quality properties of “Al-Helwani” table grape cultivar during cold storage

This study was conducted on European grape Vitis Vinifera L. Var. Helwani, for grape vine in full bearing. Fruit were picked, during two harvest dates and for three treatments (pre-cooling directly- pre-cooling after 12 h and without pre-cooling). A 1×1×1 m pre-cooling chamber was designed (cooling efficiency 125 kg\ m3) based on iced water and pumped stream air. In addition to that, we used boxes. Then handled fruit were transferred to the storage units at 0±1Cо and 90-95% RH for two months. The initial and monthly measurements for weight loss%, decay%, ripening indicator, firmness kg/cm2 and total soluble solids TSS % were done. The study showed significant effect of directly application of pre-cooling treatment on decreasing weight loss 0.508% and decay 0.591%.