cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota bandung,
Jawa barat
INDONESIA
Mesin
Published by Institut Teknologi Bandung
ISSN : -     EISSN : -     DOI : -
Core Subject : Engineering,
Mechanical Engineering
Arjuna Subject : -
Articles 539 Documents
 33   34   35   36   37 
Replacement Refrigerants for Water Chillers Ian Maclaine-cross
Mesin Vol. 14 No. 1 (1999)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The Montreal Protocol requires large water chillers cease using refrigerants 11, 22 and 123. Comparing thermodynamic and transport property parameters for these, 134a, 290, 601, 601a, 717 and pentafiuoroiodoethane avoids certain errors and biases. The parameters for R71 7 (ammonia) offer energy savings about 20%. R290 or 717 can replace 22. The pentane mixture R601 /601a [50/50] with an electronic 38% rotor speed increase can economically replace R11.
Life Cycle Testing of Hermetic Compressors With Alternatives to CFC-12 Sukumar Devotta; Nitin N Sawant; Shailesh N Joshi
Mesin Vol. 14 No. 1 (1999)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Life cycle tests of hermetic compressors were conducted using a specially designed test rig that employs a gas cycle. They were conducted at an ambient temperature of 50"C and suction and discharge pressures of 2.2 bar and 18.5 bar respectively. The oil temperature was maintained between 80- I 00"C. The duration of test was 2000h.After completion of the test, the oil samples were tested for total acid number and metal contents (Cu, Fe and Al). Any chemical degradation of refrigerant sample was assessed using NMR and F T-IR spectroscopes. The wear effects of compressor parts were measured using perthography.An assessment of conventional mineral oil with CF C-12 and various grades of hydrocarbon (HC-290 and HC-600a) blends including DIN grade, CARE-30, a blend of HC-290/HC-600a from Indian sources, destenched LPG, and commercial grade LPG has been done. HFC-134a and Polyol ester oil (POE) combination has also been studied. The comprehensive test results from the above assessment and comparative ratings are presented
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)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

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)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

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.
ALTERNATIVE REFRIGERANTS AND THEIR THERMOPHYSICAL PROPERTIES RESEARCH Koichi Watanabe; Januarius V Widiatmo
Mesin Vol. 14 No. 2 (1999)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The alternative refrigerants to be covered by the present paper include HFC (hydrofluorocarbon) refrigerants and their mixtures. Natural refrigerants such as hydrocarbons and carbon dioxide, and some new candidates such as HFEs (hydrofluoroethers), which all are non-ozone depleting substances. The authors aim to present an overview of the current state of the art with respect to several promising alternative refrigerants typically accepted in the refrigeration and air-conditioning industries in Japan. An emphasis will be given to the thermophysical properties research update that has significantly contributed to accelerate an adoption of binary and/or ternary HFC blends in various engineering applications. An important international collaboration through the IEA-Annex 18 project will be stressed so as to explain how the thermophysicists worldwide did contribute to achieve a successful landmark on thermodynamic property modeling of HFC refrigerants and their mixtures. Some essential features of other alternatives, such as hydrocarbons, carbon dioxide, and HFEs will also be discussed based on the general technical observations.
THE ENERGY CONSUMPTION OF REFRIGERATOR USING CFC 12 AND HFC 134A Budihardjo Budihardjo
Mesin Vol. 14 No. 2 (1999)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

A market survey found ± 7 companies registered to assemble refrigerators, with annual production capacity 600,000 units (1995) using CFC 12 as a refrigerant. The Association of Indonesia Electric Appliance Manufacturers and Suppliers has decided to convert refrigerant from CFC 12 to HFC 134a by January 1998. The influence of ODS and non ODS substances in refrigerators on energy consumption has been performed. The energy consumption of a manually defrost, single door, 150 Liter typical capacity refrigerators were measured at the Refrigerator Testing Laboratory University of Indonesia based on the protocol of ISO 7371 (E) 1995 under the ambient temperature of 30 "C with relative humidity between 60 % to 75 %.The averaged energy consumption of 7 units CFC-refrigerator were between 1. 1'1 and 1.38 kWh/24h, and for the HFC 134a-refrigerators between 1.03 and 1.22 kWh/24h. The energy consumption differences were approximately between 2 to 16 %.
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)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

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.
PENERAPAN METODE KRITERIA OPTIMUM DAN FAKTOR SKALA PADA OPTIMASI STRUKTUR RANGKA PENERAPAN METODA KRITERIA OPTIMUM DAN DENGAN KENDALA PERPINDAHAN TUNGGAL Wahyu Kuntjoro
Mesin Vol. 14 No. 3 (1999)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

An optimization process could be performed through a priori specification of a set of conditions to be satisfed by the optimum design. By manipulating the optimality criteria, simple redesign equations can be derived. This research looks at mathematical criteria obtained from diferentiation of Lagrangian with respect to the design variabels. In deriving the optimality criterion and developing the algorithm, fill use is made of the knowledge of the behaviour of the constraint imposed on the structure. Scale factor is applied to a design which meets the optimality criteria. "A computer program has been developed and applied to a frame structure. The design output is compared to the optirnumgdesign produced by NASIRAN Sol-200 optimization package.
APLIKASI METODE OPTIMASI STRUKTUR UNTUK MENAIKKAN KEKAKUAN PINTU AIR G2517 I Wayan Suweca; Satryo Soemantri; Suhariyono Suhariyono
Mesin Vol. 14 No. 3 (1999)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

During its operation, Slide-Water-Gate structure, receive an excessive vibration due to resonance effect caused by water current. To avoid this undesirable effect, in this paper we propose the application of structural optimization method to modify the initial structure. The goal of this optimization is to maximize the first natural frequencies so that the resonance effect can be minimized and the weight of structure is remained constant. The optimization is conducted by using the ANSYS 5.4 finite element program package.
KENDALI ADAPTIF TANGGUH TERDESENSTRALISIR UNTUK MANIPULATOR ROBOT Indrawanto Indrawanto; J Swevers; H. Van Brussel
Mesin Vol. 14 No. 3 (1999)
Publisher : Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This paper presents a robust decentralized adaptive controller for robot manipulators. The proposed controller does not require special knowledge of the robot dynamics model. Each joint of the manipulator is controlled by using an adaptive PD feedback controller and an adaptive gain acceleration feedforward. An auxiliary input is introduced to improve the convergence rate and to improve the robustness to torque disturbances and to a class of unmodelled dynamics. Lyapunov-based Model Reference Adaptive Control is used to establish the global stability of the tracking errors. Experimental results on an industrial robot are presented to verify the tracking performance of the proposed controller.

Page 35 of 54 | Total Record : 539

 33   34   35   36   37 

Filter by Year

1982 2025


Reset
Filter By Issues
All Issue Vol 30 No 2 (2025) Vol 30 No 1 (2024) Vol 29 No 2 (2023) Vol 29 No 1 (2023) Vol. 28 No. 1 (2019) Vol 27, No 2 (2018) Vol. 27 No. 2 (2018) Vol 27, No 1 (2018) Vol. 27 No. 1 (2018) Vol. 26 No. 2 (2017) Vol 26, No 2 (2017) Vol 26, No 2 (2017) Vol 26, No 1 (2017) Vol. 26 No. 1 (2017) Vol 25, No 2 (2016) Vol. 25 No. 2 (2016) Vol 25, No 1 (2016) Vol. 25 No. 1 (2016) Vol 24, No 2 (2009) Vol. 24 No. 2 (2009) Vol 24, No 1 (2009) Vol. 24 No. 1 (2009) Vol 23, No 2 (2008) Vol. 23 No. 2 (2008) Vol. 23 No. 1 (2008) Vol 23, No 1 (2008) Vol 23, No 1 (2008) Vol 22, No 2 (2007) Vol. 22 No. 2 (2007) Vol. 22 No. 1 (2007) Vol 22, No 1 (2007) Vol. 21 No. 2 (2006) Vol 21, No 2 (2006) Vol 21, No 1 (2006) Vol. 21 No. 1 (2006) Vol 21, No 1 (2006) Vol 20, No 2 (2005) Vol. 20 No. 2 (2005) Vol 20, No 1 (2005) Vol. 20 No. 1 (2005) Vol 19, No 2 (2004) Vol. 19 No. 2 (2004) Vol 19, No 1 (2004) Vol. 19 No. 1 (2004) Vol. 18 No. 2 (2003) Vol 18, No 2 (2003) Vol. 18 No. 1 (2003) Vol 18, No 1 (2003) Vol. 17 No. 3 (2002) Vol 17, No 3 (2002) Vol. 17 No. 2 (2002) Vol 17, No 2 (2002) Vol 17, No 1 (2002) Vol. 17 No. 1 (2002) Vol 16, No 3 (2001) Vol. 16 No. 3 (2001) Vol 16, No 2 (2001) Vol. 16 No. 2 (2001) Vol 16, No 1 (2001) Vol 16, No 1 (2001) Vol. 16 No. 1 (2001) Vol. 15 No. 3 (2000) Vol 15, No 3 (2000) Vol. 15 No. 2 (2000) Vol 15, No 2 (2000) Vol. 15 No. 1 (2000) Vol 15, No 1 (2000) Vol. 14 No. 3 (1999) Vol 14, No 3 (1999) Vol 14, No 2 (1999) Vol. 14 No. 2 (1999) Vol. 14 No. 1 (1999) Vol 14, No 1 (1999) Vol 13, No 3 (1998) Vol. 13 No. 3 (1998) Vol 13, No 2 (1998) Vol. 13 No. 2 (1998) Vol 13, No 1 (1998) Vol. 13 No. 1 (1998) Vol 12, No 3 (1997) Vol. 12 No. 3 (1997) Vol. 12 No. 2 (1997) Vol 12, No 2 (1997) Vol 12, No 1 (1997) Vol 12, No 1 (1997) Vol. 12 No. 1 (1997) Vol 11, No 3 (1996) Vol. 11 No. 3 (1996) Vol. 11 No. 2 (1996) Vol 11, No 2 (1996) Vol. 11 No. 1 (1996) Vol 11, No 1 (1996) Vol 10, No 1&2 (1994) Vol. 10 No. 1&2 (1994) Vol. 9 No. 1&2 (1990) Vol 9, No 1&2 (1990) Vol 8, No 1&2 (1989) Vol. 8 No. 1&2 (1989) Vol. 7 No. 1&2 (1988) Vol 7, No 1&2 (1988) Vol 6, No 1&2 (1987) Vol. 6 No. 1&2 (1987) Vol 5, No 1&2 (1986) Vol. 5 No. 1&2 (1986) Vol 4, No 3&4 (1985) Vol. 4 No. 3&4 (1985) Vol 4, No 1&2 (1985) Vol. 4 No. 1&2 (1985) Vol 3, No 2&3 (1984) Vol. 3 No. 2&3 (1984) Vol. 3 No. 4 (1984) Vol 3, No 4 (1984) Vol. 3 No. 1 (1984) Vol 3, No 1 (1984) Vol 2, No 2&3 (1983) Vol. 2 No. 2&3 (1983) Vol. 2 No. 4 (1983) Vol 2, No 4 (1983) Vol. 2 No. 1 (1983) Vol 2, No 1 (1983) Vol 1, No 1 (1982) Vol. 1 No. 1 (1982) More Issue