Hydrocooling can be an economical and effective protection against loss of eating quality in asparagus after harvest. And the factors affecting the effects of hydrocooling and applicable measures were studied to promote the asparagus quality of Taiwan.
Asparagus growers should select 25×32×36cm^2 sized polylon box for hydrocooling asparagus spears. Since the weight of ice pieces and total surface area exposed to coolant water have relation to the relative heat transfer of such areas. The smaller piece of ice used, the larger the increase in surface area and the faster heat transfer and exchange, during hydrocooling 8 places of 2.5 kg/8 and 16 pieces of 2.5 kg/16 sized ice chunks can cool the water coolant to 4℃ in 75 minutes and keep at 3℃, the preferable temperature of asparagus for 5 hours The amounts of water added to ice pieces affected the effectiveness sod efficiency of hydrocooling. For example, addition of water which was 2 times weight of ice pieces had good effect of hydrocooling and kept cold water at 4-5℃ for 6 hours. The amounts of salt added to ice pieces showed the effect on the ice meltage and temperature. However, the addition of wetting agent ouch as Triton 1991 in the cooling water didn't show any good effect of hydrocooling. Large scale asparagus packing house or lot should equip a set of shower type hydrocooler and recirculate the cold water as much as possible to save the cost of hydrocooling asparagus. And also construct appropriate hydrocooling nomographs to predict unknown temperature or time for general on-the-job use and particular commercial operation.
改進臺灣蘆筍品質及產量之研究 (II) 影響蘆筍嫩莖水冷效果因子之研究
Studies on the Improvements of Quality and Yield of Asparagus of Taiwan (Ⅱ) Factors Affecting the Effect of Hydrocooling Asparagus Spears