Conference Proceeding

Impact of Drying Air Temperature and Flow Rate on Characteristics of Vegetable Seeds Dried in Solar Regenerated Desiccant Seed Dryer

Mr. Sushant Bhardwaj

In the present study tomato and carrot seeds were dried in solar regenerated desiccant seed dryer. In this dryer, seeds can be dried in deep bed at a safe temperature for good shelf-life, germination and vigour index. The dryer has following significance over common methods of drying, generally vegetable seeds are dried in shade, which has very low drying rate and can be harmful to the seeds. Under natural drying conditions, micro organisms may develop, as moisture takes longer to be removed. Also in natural drying seeds holds moisture for longer period than advisable, due to this there is acceleration in respiration rate which causes a CO2 release and water vapour and causes a significant decrease in physiological quality of seeds. The dryer has two chambers i.e. air conditioning chamber and seed drying chamber. It operates in seed drying and desiccant regeneration mode. Moisture removal from drying air has been done using silica gel desiccant. Tomato and carrot seeds were dried with hot and dehumidified air at five different drying air temperatures i.e. 38, 40, 42, 44 and 46⁰C and at five different air flow rates i.e., 1, 1.2, 1.4, 1.6 and 1.8 m3/min. Germination of tomato and carrot seeds varied from 86-64% and 74-68% respectively as temperature varied between 38-46⁰C and vigour index varied from 1007.92-558.72 and 754.8 - 418.18 respectively. Using this dryer, it was found that seeds could be dried in 2-4 hours. Also, the shade drying is not effective when ambient relative humidity is high but in the case of this dryer, there was no effect of ambient relative humidity on the drying process.

Published: 08 November 2017


Copyright: © 2017 Mr. Sushant Bhardwaj. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.