CAJ | 학술논문

建立甘蓝差压预冷实验台,设计5种不同外部开孔方式,分别为28个孔、32个非均匀孔、32个均匀孔、40个孔和50个孔.分别对甘蓝在上述不同开孔方式下进行差压预冷实验,在降温过程中测试出甘蓝中心及1/2R处温度值,计算了甘蓝中心温度在预冷降温到6小时时的均匀性.结果表明:在初始阶段,周转箱外部不同开孔方式对甘蓝中心及1/2R处温度影响不大,且降温速度均较缓慢,但随预冷时间增加,降温速度逐渐加快且不同开孔方式下的降温速度之间开始有明显差距,其中外部开孔为40个孔的甘蓝中心温度和1/2R处温度均降低最快;另外通过计算知外部开孔为40个孔的降温均匀度最小,均匀性最好,故此种底部开孔孔径小,上部开孔孔径大的开孔方式在果蔬差压预冷应优先考虑采用.
건립감람차압예랭실험태,설계5충불동외부개공방식,분별위28개공、32개비균균공、32개균균공、40개공화50개공.분별대감람재상술불동개공방식하진행차압예랭실험,재강온과정중측시출감람중심급1/2R처온도치,계산료감람중심온도재예랭강온도6소시시적균균성.결과표명:재초시계단,주전상외부불동개공방식대감람중심급1/2R처온도영향불대,차강온속도균교완만,단수예랭시간증가,강온속도축점가쾌차불동개공방식하적강온속도지간개시유명현차거,기중외부개공위40개공적감람중심온도화1/2R처온도균강저최쾌;령외통과계산지외부개공위40개공적강온균균도최소,균균성최호,고차충저부개공공경소,상부개공공경대적개공방식재과소차압예랭응우선고필채용.
@@@@An experimental table was put up for the forced air pre-cooling test to cabbage. Five different modes of external openings were designed, including 28 holes, 32 non-uniform holes, 32 uniform holes, 40 holes and 50 holes. Forced air pre-cooling experiment was carried out respectively under the above different opening modes to cabbage and the temperatures of cabbage core and 1/2R were tested during the whole temperature-fall period, the cabbage core temperature uniformity after 6 hours pre-cooling was calculated. The results showed that: in preliminary stage, the external different opening modes had little effect on cabbage core and 1/2R temperature and all of the cooling rates were slow. However, with pre-cooling time increasing, the cooling rates speeded up and the gap between the cooling rates began to increase obviously. Of all the opeing modes, the temperatures of cabbage core and 1/2R decreased most quickly under the 40 holes external opening mode and through calculation, the cooling uniformity value of 40 holes external opening mde was the smallest and the cooling uniformity was the best. So the external opening mode of 40 holes in which the hole diameter is smaller at the bottom than the upper ones should be adopted firstly when doing forced air pre-cooling to vegetables and fruits.