摘要
温度是果蔬贮藏环境最重要的参数。为了研究果蔬进库过程中影响货物温度稳定性的因素,该文以西安某苹果冷藏库为研究对象,建立冷库环境三维非稳态数值求解模型,模拟了进货过程中新进货物摆放间距、进货温度和进货量对达到贮藏条件货物温度稳定性的影响。模拟结果表明,在实际运行管理中,存在适宜的进货温度和进货量,可使苹果贮藏环境受进货过程影响最小,进货效率最高;增大进货间距可以减小对货物温度场的影响,进货摆放间距并不是越大越好。该文研究的冷库,进货过程中货物应先预冷到3℃再进库,进货摆放间距为0.5 m,进货量不大于10%。
Temperature is one of the most important environmental parameters for fruit or vegetable cold storage. During loading process of fruits or vegetables into cold storage, the new loading goods will influence the temperature stability of goods already settled in the storage room which have reached the storage requirements. Obtaining temperature variation and distribution characteristics in a cold storage during the loading process can provide theoretical reference for optimal design of the cold storage and improve its practical operation and management. To study the factors on the stability of goods temperature during the loading process of fruits and vegetables into cold storage, a combination of CFD（computational fluid dynamics） calculation and experimental study was carried out to further understand the complicated phenomenon of air flow and heat transfer in cold storage. A 3D（three-dimensional） unsteady numerical calculation model of storage environment was developed for a real cold storage with 50 t volume for apples in Xi＇an. A ceiling air cooler was equipped in the cold storage. The k-ε turbulent model was considered as CFD model. The apple zone was regarded as porous medium zone. The influences of the spacing of goods, loading temperature and loading quantity on the temperature stability of goods were numerically studied under the condition that the door was closed and the ceiling air cooler was running. The simulation results were validated by experimental results. The experimental system consisted of temperature sensor and temperature illustration cabinet. The temperature sensor was set at ceiling air cooler＇s air outlet and connected to the temperature illustration cabinet at test room. The temperature was measured and analyzed once every 2 h. In this study, the reliability of the simulation data was verified by the data of the temperature variation within 24 h after the new goods entered the cold storage. The numerical results were in good agreement with the measured results. The non-uniform
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2015年第20期294-300,共7页
Transactions of the Chinese Society of Agricultural Engineering
基金
十一五"国家科技支撑计划(2008BAJ08B07-1)
关键词
冷藏库
温度
三维
进货过程
CFD
cold storage
temperature
three-dimensional
loading process
CFD
