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Adriansyah, Willy
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Mechanical Engineering

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PEMODELAN DAN PERANCANGAN GAS COOLER UNTUK MESIN REFRIGERASI CO2 Adriansyah, Willy
Mesin Vol 18, No 2 (2003)
Publisher : Mesin

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Abstract

Gas cooler is one of the important components in CO2 refrigeration system and it must be designed properly. Conventional mathematical modeling used in designing heat exchanger have some drawbacks when the working fluid has large variation on its thermo physical properties. This paper discusses detail modeling and designing one of heat exchanger types which takes into account unique characteristic of CO2 as refrigerant. The mathematical model is then validated by experimental data. The comparison shows that the model predicts gas cooler performance within 2% maximum deviation. The principles of modeling can be applied to various types of heat exchanger.
PERANCANGAN DAN PEMBUATAN ALAT UJI KOMPRESOR REFRIGERASI Adriansyah, Willy
Mesin Vol 20, No 1 (2005)
Publisher : Mesin

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Abstract

A compressor testing device based on vapor compression cycle has been designed and built successfully. Simple and easy operation is the main differences between the device and conventional compressor testing device. A reciprocating compressor performance was tested for two kind of refrigerants; R22 and HCR22 using this device. From the experimental results it is found that the isentropic efficiency can be represented by a two degrees polynomial function. The experimental results also shows that the isentropic efficiency of the compressor using R22 is higher compared to the same compressor using HCR22.
PENGEMBANGAN PERANGKAT LUNAK UNTUK PENERAPAN TEKNIK PINCH DENGAN MELIBATKAN KENDALA RUGI TEKANAN Adriansyah, Willy; Suwono, Aryadi
Mesin Vol 11, No 2 (1996)
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Abstract

The existing software of pinch technique provide only the tool for the heat exchanger network design. To improve the reliability of the software, in particularly for retrofitting the existing system, several additional aspects need to be included. In this paper, an algorithm to determine the optimum condition of heat exchangers for a specified allowable head loss is proposed. With this new method, the retrofit design of an existing system can be done even by taking into consideration of using the existing fluid circulation systems (i.e. pumps and compressors). The proposed method of heat exchanger can also be used under the pressure drop constraints on both tube and shell sides.
PEMAKAIAN CO2 SEBAGAI REFRIGERAN Adriansyah, Willy; Bredesen, Arne M; Neksa, Petter
Mesin Vol 12, No 3 (1997)
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Abstract

In the present situation there is a tendency to avoid as far as possible the use of the synthetic substances as refrigerant which can destroy ozone layer and increase average contribute to the A much more safe philosophy must be to revert to natural refrigerants, substances which are already present in our environment. The use of C02 as refrigerant is one attempt to this approach. This new refrigeration technology use special cycle called “Lorentzen Cycle".  Lorentzen s invention opened a wide way to enhance the refrigeration technology and brought a lot of applications that can use this new cycle. This paper try to explain the basic principle of“Lorentzen Cycle” and one of such applications which has being developed at Norwegian University of Science and Technology.
SIFAT TERMODINAMIKA CAMPURAN PROPANA/N-BUTANA DAN KEMUNGKINANNYA SEBAGAI SUBTITUSI REFRIGERAN R12 Suwono, Aryadi; Adriansyah, Willy
Mesin Vol 10, No 1&2 (1994)
Publisher : Mesin

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Abstract

Di bidang teknik pendingin terbitnya kesepakatan Protokol Montreal, mencetuskan masalah yang cukup besar, Karena R12 (CCl2F2,) dan refrigeran sejenis lainnya yang selama ini menjadi refrigeran andalan, tidak akan lagi dapat dipakai dan perlu segera dicarikan penggantinya. Dalam tulisan ini dibahas mengenai peluang pemakaian campuran propana/n-butana sebagai alternatif subtitusi sementara R12 hingga refrigeran pengganti yang lebih baik dan ekonomis dapat diperoleh di pasaran. Untuk prediksi sifat termodinamika campuran tersebut. dalam tulisan ini diusulkan sebuah persamaan tingkat keadaan termodinamika yang dapai dievaluasi dari sifat masing-masing unsurnya. Pembahasan dititik-beratkan pada penjabaran dan pengembangan persamaan tersebut serta hasil yang diperoleh dikaitkan denganusaha untuk mendekati sifat termodinamika R12.
PENGEMBANGAN PERSAMAAN KORELASI PENDIDHAN KOLAM UNTUK REFRIGERAN HIDROKARBON Pasek, Ari Darmawan; Adriansyah, Willy; Hery, Hery; Leo, Hengky
Mesin Vol 23, No 2 (2008)
Publisher : Mesin

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Abstract

Hydrocarbons (HC) are considered as the alterative substitutes of CFC and HCFC refrigerants. Using it as new refrigerants needs a complete knowledge of its characteristics. One of them is the boiling heat transfer coefficient. Series of experiments were carried out to investigate this characteristics. Experiments had been carried out with R-12 (CFC) and R-22 (HCFC) and their substitutes, HC-12 and HC-22. Tested refrigerant was conditiond at a saturated state and an electric heater immersed in the refrigerant pool of liquid was used as the boiling surface. Boiling heat transfer coefficient is determined as the ratio between the heat flux and the excess temperature on the boiling surface. The experimental results were compared between R-12 and R-22 with their substitutes. The experimental results were compared with the correlation equations proposed by researchers. Based on the analysis results, modified correlation equations are proposed for the tested refrigerants.
Co-Authors Ari Darmawan Pasek Aryadi Suwono Bredesen, Arne M Hery Hery Leo, Hengky Neksa, Petter