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A Suwono
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Mechanical Engineering

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PENGARUH COSOL VENT POLAR PADA KELARUTAN β-KAROTIN DALAM CO2 SUPERKRITIK J P Sitompul; H Wahyudi; I N Widiasa; A Suwono
Mesin Vol. 12 No. 3 (1997)
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A simple correlation and prediction of β-carotene in supercritical CO2 involving cosolvents has been developed. Several cubic equations (EOS) and proper mixing rules are employed in correlating available experimental data of solubility fl-carotene in supercritical CO2 involving polar cosolvents. The studies found that strong interaction in the system involving polar cosolvents occurred for which binary interaction parameters should be adjusted for correlating solubility of β-carotene. The strong interaction could be possibly that of solute-solute, solute- cosolvent or cosolvent association. The simple model, however, can predict solubility of β-carotene in that system studied after adjusting binary interaction parameters.
Performance Testing of Indonesian Hydrocarbon Refrigerants N. P Tandian; A Suwono; A. D Pasek; T Hardianto; T. A Soelaiman; B. T Prasetyo; Sarwono Sarwono; Kafi'uddin Kafi'uddin
Mesin Vol. 14 No. 1 (1999)
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In conjunction with the CFC phase out, IURC-ES ITB has been concentrating its research of HC refrigerant on 'propane natural butane' (PNB) refrigerant. The test results obtained in IURC-ES ITB during the development of the PNB refrigerant showed that PNB has better performance than PIB and CFC-12. The field tests of PNB also showed the similar results. Recently, to reconfirm the previous test results, the performance of PNB, PIB and CFC-I2 were compared in a series of performance tests in the LTMP Serpong. The tests also show that PNB consistently has better performance compared to PIB and CFC-12. This paper also reports the current development of PNB refrigerant in IURC-ES ITB.
Indonesian Experiences in Retrofitting of Some Milk Cooler Systems Ari D. Pasek; N. P Tandian; A Suwono; T Hardianto; T. A Fauzi Soelaiman
Mesin Vol. 14 No. 2 (1999)
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To overcome the ozone layer depletion problem, the Indonesian government has ratified the Montreal protocol and its amendments. The import of R-12 refrigerant to Indonesia has been banned since the end of 1997. Meanwhile, most of Indonesian milk cooling units use R-12. Therefore, it is expected that these cooling units have to be switched to other refrigerant soon. Almost all of Indonesian milk cooling units belong to small or medium dairy cooperatives that cannot aflord to retrofit their systems to R-134a. In this research, a milk-cooling unit designed for R-12 was directly switched to propane/butane refrigerants (propane-isobutane, and propane/n-butane refrigerants) without any modification. The performances of the milk-cooling unit operated with propane/isobutane, propane/n-butane and R-12 gefiigerants were investigated. It was found that propane/n~bntane refligerant is the most eflicient, and followed by propane/isobutane and R-12. Results of several other milk cooling units were also reported.
Performance Comparison of CFC12, HCR12 and HCR12+LFS as Refrigerants Nila Damitri; C Soekardi; B. T Prasetyo; Sarwono Sarwono; Kafi'uddin Kafi'uddin; A Suwono; A. D Pasek; N. P Tandian
Mesin Vol. 14 No. 2 (1999)
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Additional concern about warming of the global environment through the greenhouse effect has necessitated selection of compounds with shorter atmospheric lifetimes and higher energy efficiencies as substitute refligerants for Heating, Air Conditioning, and refrigerating equipment.Several substitute compounds of the hidrocarbon were identified by similarities in normal boiling points and corresponding saturated vapor pressure characteristics. Sample quantities were obtained from ITB (Two sample corresponds with CFCIZ named Hycool HCRI2 and Hycool HCR12+LFS). Performance comparisons among these refrigerants are performed utilizing Air Conditioning System test facility in Laboratory for Thermodynamics, Engines and Propulsion System (LIMP "“ BPP Teknologi). The results show that these alternatives refrigerants exhibit better performance than CFC I 2 at the predetermined operating conditions.
DAMPAK INDUSTRIALISASI TERHADAP PERKEMBANGAN PENDIDIKAN BIDANG TEKNOLOGI MESIN O Diran; A Suwono
Mesin Vol. 2 No. 1 (1983)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/MESIN.1983.2.1

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Co-Authors A. D Pasek Ari D. Pasek B. T Prasetyo C Soekardi H Wahyudi I N Widiasa J P Sitompul Kafi'uddin Kafi'uddin N. P Tandian Nila Damitri O Diran Sarwono Sarwono T Hardianto T. A Fauzi Soelaiman T. A Soelaiman