Processing of drying longan by combined hot air-drying and solar drying

Longan was dried by combined air-drying and solar drying. By comparing the quality of dried longan, the processing parameters including temperature, drying time and loading were optimized by orthogonal test. Results showed that the optimal process parameters were as following: the loading of material was 200 g, the initial airdrying temperature was 55 for 16 h, the following solar drying time was 8 h.