Characteristics of Vacuum Freeze Drying with Utilization of Internal Cooling and Condenser Waste Heat for Sublimation

Authors

Muhammad Idrus Alhamid, Department of Mechanical Engineering, Universitas Indonesia, Depok 16424, IndonesiaFollow
Nasruddin Yusuf, Department of Mechanical Engineering, Universitas Indonesia, Depok 16424, Indonesia
Indra Teuku Meurah Mahlia, College of Engineering, University Tenaga Nasional, Jalan IKRAM-UNITEN, 43000 Kajang, Selangor Darul Ehsan, Malaysia
Engkos Ahmad Kosasih, Department of Mechanical Engineering, Universitas Indonesia, Depok 16424, Indonesia
Muhamad Yulianto, Department of Mechanical and Biosystem Engineering, Institut Pertanian Bogor, Darmaga, Bogor 16002, Indonesia
Rio Ricardi, Department of Mechanical Engineering, Universitas Indonesia, Depok 16424, Indonesia

Abstract

Vacuum freeze drying is an excellent drying method, but it is very energy-intensive because a relatively long drying time is required. This research investigates the utilization of condenser waste heat for sublimation as a way of accelerating the drying rate. In addition, it also investigates the effect of internal cooling combined with vacuum cooling in the pressure reduction process. Jelly fish tentacles were used as the specimen, with different configurations for condenser heat waste and internal cooling valve opening. The results show that heating with condenser heat waste can accelerate the drying rate up to 0.0035 kg/m2.s. In addition, pre-freezing by internal cooling prevents evaporation until the mass of the specimen is 0.47 g and promotes transition of the specimen into the solid phase.

Bahasa Abstract

Karakteristik Pengering Beku Vakum dengan Menggunakan Pendinginan Internal dan Panas Buang Kondenser untuk Sublimasi. Pengering beku vakum adalah metode pengeringan yang terbaik, tetapi konsumsi energinya sangat tinggi karena lamanya waktu pengeringan yang diperlukan. Penelitian ini mengkaji penggunaan panas buang kondenser untuk proses sublimasi sebagai salah satu cara untuk mempercepat laju pengeringan. Disamping itu, juga mengkaji pengaruh pendinginan internal yang dikombinasikan dengan pendinginan vakum pada waktu dilakukan proses penurunan tekanan. Tentakel ubur-ubur (Jelly fish tentacles) digunakan sebagai bahan percobaan dengan berbagai konfigurasi panas buang kondensor dan pembukaan katup pendinginan internal. Hasilnya menunjukkan bahwa pemanasan dengan panas buang kondensor dapat mempercepat laju pengeringan sampai dengan 0.0035 kg/m2.s Selain itu, pembekuan awal dengan melakukan pendinginan internal dapat mencegah terjadinya penguapan sampai dengan 0.47g dan mempercepat transformasinya menjadi padatan.

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Recommended Citation

Alhamid, Muhammad Idrus; Yusuf, Nasruddin; Mahlia, Indra Teuku Meurah; Kosasih, Engkos Ahmad; Yulianto, Muhamad; and Ricardi, Rio (2013) "Characteristics of Vacuum Freeze Drying with Utilization of Internal Cooling and Condenser Waste Heat for Sublimation," Makara Journal of Technology: Vol. 17: Iss. 2, Article 1.
DOI: 10.7454/mst.v17i2.1928
Available at: https://scholarhub.ui.ac.id/mjt/vol17/iss2/1