HEAT EXCHANGER ANALYSIS OF BLACK TEA DRYING USING GEOTHERMAL DIRECT USE IN WEST JAVA

• Main Author: Mikkel
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/57629
• Institution: Institut Teknologi Bandung

Tea is one of the most consumed beverages in the world. Indonesia is one of the biggest tea exporters in the world, where the biggest tea producing province is West Java. The type of tea leaves produced in West Java is black tea leaves. One of the production processes is drying, which usually uses diesel oil as its source of energy. Aside from being a tea producer, West Java also has huge geothermal potential, which is utilized by Patuha geothermal power plant. On this undergraduate assignment, the author has designed a geothermal direct-use system for black tea drying process in West Java. This geothermal direct-use system is designed based on the Patuha Geothermal Power Plant Unit 1 P&ID by utilizing its brine that has been separated from its vapor phase in the separator. The tea drying process uses vibro-fluidized bed dryer as its means of dryer. Three types of heat exchanger specifications have been designed to increase the air temperature to the temperature needed for the drying process, which are double pipe, shell and tube, and spiral plate. This design will lead to CO2 emission reduction compared to the use of Industrial Diesel Oil (IDO) in the drying process. This geothermal direct-use system design for black tea drying process in West Java can produce up to 154.86 tons of dried black tea per year. The process needs 135.762 kW of energy which are accommodated by a heat exchanger. The most recommended type of heat transfer is the shell and tube for non-slurry brine. If the brine is slurry, spiral plate is more recommended to be used in the system. In the end, the use of geothermal energy for tea drying can lead to 4.19 ton CO2 emission reduction daily.