Vol 17, No 2 (2013) > Articles >

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

Muhammad Alhamid 1 , Nasruddin Yusuf 1 , Indra Mahlia 2 , Engkos Kosasih 1 , Muhamad Yulianto 3 , Rio Ricardi 1

Affiliations:

  1. Department of Mechanical Engineering, Universitas Indonesia, Depok 16424, Indonesia
  2. College of Engineering, University Tenaga Nasional, Jalan IKRAM-UNITEN, 43000 Kajang, Selangor Darul Ehsan, Malaysia
  3. Department of Mechanical and Biosystem Engineering, Institut Pertanian Bogor, Darmaga, Bogor 16002, 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.

Keywords: condenser waste heat, drying rate, internal cooling, sublimation, vacuum freeze drying
Published at: Vol 17, No 2 (2013) pages: 51-58
DOI:

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