Performance Evaluation of Three-stage Scraped Surface Heat Exchanger (SSHE) for Continuous Manufacturing of Burfi

Burfi was manufactured in three-stage scraped surface heat exchanger by adding sugar directly into preheated milk by varying scraper speed in all three stages with different steam pressure in all three stages. The performance evaluation of the machine was evaluated during continuous mechanized manufacturing of Burfi. The average overall heat transfer coefficient were 1600, 950, and 410 W/m2K for first, the second and third stage of thin-film scraped heat exchanger (TFSSHE), respectively. The specific steam consumption was found out to be 1.12 to 0.93 kg steam per kg of milk processed with mean value of 1 kg steam per kg of milk processed. The electricity consumption was found out to be 6.0 to 8.34 KWh per 1000 kg of milk processed with a mean value of 6.83 kWh per 1000 kg of milk processed. The sensory evaluation score of the burfi manufactured in the SSHE was obtained 20.6 out of a total of 25.