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

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