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All Journal Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering)
Yahdi, M. Arief
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Agriculture, Biological Sciences & Forestry Engineering

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Theoretical Study of Shell-and-Tube Heat Exchanger Effectiveness on Batch Drying of Sawdust Utilizing Waste Heat from Organic Rankine Cycle Yahdi, M. Arief; Hartulistiyoso, Edy; Yulianto, Muhamad
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol 14, No 1 (2025): February 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i1.71-82

Abstract

Steam power plant has flue gas that are generally discharged into environment. The exhaust gases from internal combustion contain thermal energy that can be utilized for drying processes, which can enhance the energy efficiency of the Organic Rankine Cycle (ORC) system. This research focuses on the use of waste heat for drying applications through heat exchangers. The objective of this work is to study the performance of shell-and-tube type heat exchanger in utilizing waste heat from an ORC system for drying applications. Experimental data was obtained by varying the air velocity of the dryer to validate the numerical simulations. The results showed that increasing air velocity in the heat exchanger caused a decrease in heat exchanger outlet temperature, water vapor mass, and heat exchanger effectiveness. The decrease in these parameters reduces heat transfer required for drying, so water mass rate of material decreases and drying time gets longer. Validation of simulation and experiment data for outlet heat exchanger temperature was determined by MAPE value of less than 20% which means good prediction model. Keywords: Air velocity, Drying, Effectiveness heat exchanger, Exhaust gas, Heat exchanger.
Theoretical Study of Shell-and-Tube Heat Exchanger Effectiveness on Batch Drying of Sawdust Utilizing Waste Heat from Organic Rankine Cycle Yahdi, M. Arief; Hartulistiyoso, Edy; Yulianto, Muhamad
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 1 (2025): February 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtep-l.v14i1.71-82

Abstract

Steam power plant has flue gas that are generally discharged into environment. The exhaust gases from internal combustion contain thermal energy that can be utilized for drying processes, which can enhance the energy efficiency of the Organic Rankine Cycle (ORC) system. This research focuses on the use of waste heat for drying applications through heat exchangers. The objective of this work is to study the performance of shell-and-tube type heat exchanger in utilizing waste heat from an ORC system for drying applications. Experimental data was obtained by varying the air velocity of the dryer to validate the numerical simulations. The results showed that increasing air velocity in the heat exchanger caused a decrease in heat exchanger outlet temperature, water vapor mass, and heat exchanger effectiveness. The decrease in these parameters reduces heat transfer required for drying, so water mass rate of material decreases and drying time gets longer. Validation of simulation and experiment data for outlet heat exchanger temperature was determined by MAPE value of less than 20% which means good prediction model. Keywords: Air velocity, Drying, Effectiveness heat exchanger, Exhaust gas, Heat exchanger.
Design and Development of a Garlic Dryer (Allium sativum L.) with the Addition of Parafin as a Heat Storage Medium Ahmar, Afdhalul; Haifan, Moh; Yahdi, M. Arief; Al Azhari, Lalu Muh Fathul Aziz
Jurnal Teknik Pertanian Lampung (Journal of Agricultural Engineering) Vol. 14 No. 4 (2025): August 2025
Publisher : The University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jtepl.v14i4.1441-1451

Abstract

Garlic is an important commodity as a basic spice for various dishes with several health benefits such as lowering blood pressure and improving immune system. Fresh garlic has a high moisture content of 60.9-67.8%, making it highly susceptible to microbial spoilage. The drying process is a critical post-harvest step for garlic that significantly influences product quality and shelf life. This study aims to design a garlic drying system enhanced with solar collector and parafin as a thermal storage medium. Parafin provides heat during periods of low sunlight, allowing continuous drying. The methodology includes the design, construction, and testing of the drying equipment. Functional tests demonstrate effective operation of the dryer components. The results of testing the dryer for drying garlic were able to reduce the water content of garlic from 60% wb to 11.2% wb for 8 h of drying. The use of paraffin has proven to be effective in helping to maintain the drying temperature, especially when the intensity of sunlight is reduced, so that the drying process remains optimal.
Co-Authors Ahmar, Afdhalul Al Azhari, Lalu Muh Fathul Aziz Edy Hartulistiyoso Haifan, Moh Muhamad Yulianto