火龙果的冷却方式选择

The Chose of Cooling Method for Dragon Fruit

[目的]研究火龙果的最佳冷却方法。[方法]首先进行不同终压(550、600及650Pa)的真空预冷、不同水温(0、1.5及3℃)的水冷及2m/s风速的强制通风(4℃)试验,然后,从每种试验中选择最优组进行比较,从中选择最适合火龙果的冷却方式。[结果]真空预冷最低只能将火龙果降到10℃左右;强制通风虽能把火龙果降到5℃以下,但时间过长,需要4～5h;冷水温度为0℃时,火龙果的温度降低最快,1h可降到5.5℃。[结论]火龙果的最佳冷却方式是0℃水冷。

Abstract [ Objective ] The aim of the study was to select the best cooling method for dragon fruit. [ Method ] Three groups of experiments, vacuum cooling under different pressures （550,600 and 650 Pa）, water-cooling in different water temperatures （0, 1.5 and 3.0℃ ） as well as forces air cooling at the speed of 2 m/s and in temperature of 4℃, were firstly performed, and then the best one was chosen form each group to compare each other in order to find the best method. [ Result ] The results indicated that ： the dragon fruit only could be cooled to about 10℃ through vacuum cooling ; the dragon fruit could be cooled to below 5℃ by forces air, but cooling period （ about 4 to 5 hour） was too long ; the cooled water in the temperature of 0 ℃can cool the dragon fruit to 5.5 ℃ in a short time of less than 1 hour. [ Conclusion] The best cool- ing method of dragon fruit was water-cooling in temperature of 0 ℃.