Abstract: Aiming at the problem whereby both drying quality and production cost cannot be achieved in the drying production of fruits and vegetables， a drying test bench for refraction window was designed and the drying quality was evaluated. A random block design was adopted， and COMSOL simulation software was used to compare and study the temperature distribution of the heated refraction window test rig and the circulating refraction window test rig. The results showed that the temperature distribution of the heated test rig was more uniform. The key parameters of the heating rod in the test bench were optimized using the Doptimal hybrid design. The regression analysis showed that the heating rod parameters had a side distance of 154 mm， a bottom edge distance of 76 mm， and a heating rod length of 340 mm. The temperature uniformity of the upper surface was optimal. According to the simulation results， a refracting window drying test bench was designed and fabricated， and the refracting window drying test bench was used to carry out the drying test and test the drying quality. It was established that refractance window drying can effectively retain vitamin C， soluble sugars and titratable acids in tomatoes， and is a potential new drying technology.

Key words: refractiance window drying, parameter optimization, quality evaluation, Doptimal hybrid design, tomato slurry

摘要： 针对果蔬干燥生产中干燥品质与生产成本不能兼得的问题，设计折射窗干燥试验台并进行干燥品质评价。采取随机区组设计，使用COMSOL仿真软件对比研究加热型折射窗试验台与循环型折射窗试验台的温度分布，结果显示加热型试验台温度分布更均匀。对试验台中加热棒关键参数采用D最优混合设计进行优化，回归分析表明加热棒参数侧边距为154 mm，底边距为76 mm，加热棒长为340 mm时上表面温度均匀性最优。根据仿真结果设计并制作折射窗干燥试验台，利用折射窗干燥试验台进行干燥试验并检测干燥品质。折射窗干燥能够很好地保留番茄中的维生素C、可溶性糖与可滴定酸，是一项具有潜力的新型干燥技术。

关键词: 折射窗干燥, 参数优化, 品质评价, D最优混合设计, 番茄浆液