果品入库期库温与霜温动态变化分析

为研究双温双控冷库在果品入库期库温与霜温的动态变化，以lOt双温双控冷库为试验库，分别在果品进入冷库前、果品入库期和入库1d后的3段时间内，利用热电偶和数据采集系统监测并分析了库温和霜温的动态变化．结果表明：双温双控冷库在果品入库期，库温升高，改变了原来稳定的状态，周期用时延长且由3个阶段变为2个阶段，耗能增加；在制冷阶段，出现先降温后升温的现象，霜温最低值达到仪表设定的下限-10．0℃，此时段冷库由霜温控制；双温双控冷库在果品入库阶段能及时化霜，避免制冷效率大幅下降．入库1d后，库温恢复稳定，但周期用时增加．

Analysising dynamic change of cold storage temperature and frost temperature during the period of fruits entering into the storage

In order to study dynamic change in the temperature of dual temperature and dualcon- trol cold storage, we used the thermocouples and data acquisition system to dynamically monitor the cold storage temperature and frost temperature during three periods of time, the period before the fruits entering,entering and one day after entering the cold storage base on a lO-ton daul tem- perature and dual control cold starage. Results showed that： during the period of fruit entering into storage, cold storage temperature rose and the original steady state was changed, the cycle time was extended and three stages changed into two and energy consumption increased. In the cooling stage, cold storage temperature increased first and then decreased, the minimum value of frost temperature reached -10.0℃, the lowest temperature of the instrument and the cold storage was controlled by the frost temperature. Dual temperature and dual-control cold storage could de- frost in time and avoid the cooling efficiency decline. One day after storage, the cold storage tem- perature gradually restored stability, but the cycle was extended.