. Conclusion
In order to investigated the performance of a large-scale greenhouse dryer, three batches of chilli were
dried in the greenhouse dryer at Ubon Ratchathani. Solar drying in the solar greenhouse dryer resulted in
considerable reductions in drying time as compared with the natural sun drying and the colour of products
dried in the solar greenhouse dryer are better than natural sun dried samples. The estimated payback
period of the greenhouse solar dryer is about 2 years. Due to its high technical and economic
performance, this type of dryer has been included in the dissemination program of the Department of
Alternative Energy Development and Efficiency, Thailand. More than ten units of this type of dryer are
now used in small-scale food industries to produce dried products including chilli across the country