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P. Sidhi, Sigit Deddy
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Pemodelan Solidifikasi untuk Proses Pembekuan Air dengan Geometri Cetakan Es Bujur Sangkar dan Persegi Panjang Pujianto, Andreas; Prabowo, Prabowo; P. Sidhi, Sigit Deddy
Jurnal Airaha Vol 5 No 2: Desember 2016
Publisher : Politeknik Kelautan dan Perikanan Sorong

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (468.252 KB)

Abstract

Numerical study is presented concerning transient solidification for water freezing process. The ice can produces 25 kg of ice block product is used as model in this study. 2D-simpllified geometry of ice can is modeled with square and rectangular shape which have different aspect ratio (H/L) 1 and 0.62 respectively. Both of shapes is compared one to another based on heat transfer and duration of solidification. Boundary conditions use isothermal temperature walls. Three walls (top, bottom, and right) have the same temperature values are -8℃ and the left wall temperature value is 0℃. Second order implicit URANS equations were solved with laminar model in numerical calculation. Most of internal heat energy (latent and sensible) from the water released to the walls which have lower temperature than other wall for 15 hours cooling process. This condition makes temperature of the liquid water decrease and phase change occured. The rectangular shape perform better than the square shape in heat transfer of internal heat energy from the water to the walls shape. The top and bottom wall from rectangular shape have greater value of heat transfer because their area are larger than other walls. Solidification process of the water in the rectangular shape faster 7,03% than square which showed by growth of water solid fraction in time of 15 hours cooling process.
Studi Eksperimen untuk Kondisi Tanpa Beban pada Pengering Ikan Tipe Greenhouse Aktif P. Sidhi, Sigit Deddy; Pujianto, Andreas; Muhfizar, Muhfizar; Prasetyo, Djoko
Jurnal Airaha Vol 6 No 2: Desember 2017
Publisher : Politeknik Kelautan dan Perikanan Sorong

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (479.596 KB)

Abstract

Among all available renewable energy sources, solar energy is the most abundant one and is available in both direct as well as indirect forms. People have applied solar energy as energy alternative in various fields. One of the field that use solar energy is drying. Drying is one of the best methods to preserve product like fish. Fish drying is practice to preserve the fish for longer duration. Entrapment of thermal energy from solar radiation may be the best option for fish drying by using closed drying (greenhouse). This study aims to determine the effect of inlet velocity of air to the thermal performance of greenhouse in the no-load conditions by considering several environmental parameters such as temperature, humidity and solar radiation. The half an hourly data for ambient temperature, outlet temperature, relative humidity of air, wind velocity, radiation intensity were taken inside and outside the greenhouse dryer. These data are used for the determination of thermal performance of active greenhouse dryer. From experimental results, it can be concluded that drying conditions with inlet velocity of air 0,8 m/s is more favorable than inlet velocity of air 1,6 m/s as obtained thermal efficiency of active greenhouse is higher.
Pemodelan Solidifikasi untuk Proses Pembekuan Air dengan Geometri Cetakan Es Bujur Sangkar dan Persegi Panjang Andreas Pujianto; Prabowo Prabowo; Sigit Deddy P. Sidhi
Jurnal Airaha Vol 5 No 2: Desember 2016
Publisher : Politeknik Kelautan dan Perikanan Sorong, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (468.252 KB) | DOI: 10.15578/ja.v5i2.28

Abstract

Numerical study is presented concerning transient solidification for water freezing process. The ice can produces 25 kg of ice block product is used as model in this study. 2D-simpllified geometry of ice can is modeled with square and rectangular shape which have different aspect ratio (H/L) 1 and 0.62 respectively. Both of shapes is compared one to another based on heat transfer and duration of solidification. Boundary conditions use isothermal temperature walls. Three walls (top, bottom, and right) have the same temperature values are -8℃ and the left wall temperature value is 0℃. Second order implicit URANS equations were solved with laminar model in numerical calculation. Most of internal heat energy (latent and sensible) from the water released to the walls which have lower temperature than other wall for 15 hours cooling process. This condition makes temperature of the liquid water decrease and phase change occured. The rectangular shape perform better than the square shape in heat transfer of internal heat energy from the water to the walls shape. The top and bottom wall from rectangular shape have greater value of heat transfer because their area are larger than other walls. Solidification process of the water in the rectangular shape faster 7,03% than square which showed by growth of water solid fraction in time of 15 hours cooling process.
Studi Eksperimen untuk Kondisi Tanpa Beban pada Pengering Ikan Tipe Greenhouse Aktif Sigit Deddy P. Sidhi; Andreas Pujianto; Muhfizar Muhfizar; Djoko Prasetyo
Jurnal Airaha Vol 6 No 2: Desember 2017
Publisher : Politeknik Kelautan dan Perikanan Sorong, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (479.596 KB) | DOI: 10.15578/ja.v6i2.77

Abstract

Among all available renewable energy sources, solar energy is the most abundant one and is available in both direct as well as indirect forms. People have applied solar energy as energy alternative in various fields. One of the field that use solar energy is drying. Drying is one of the best methods to preserve product like fish. Fish drying is practice to preserve the fish for longer duration. Entrapment of thermal energy from solar radiation may be the best option for fish drying by using closed drying (greenhouse). This study aims to determine the effect of inlet velocity of air to the thermal performance of greenhouse in the no-load conditions by considering several environmental parameters such as temperature, humidity and solar radiation. The half an hourly data for ambient temperature, outlet temperature, relative humidity of air, wind velocity, radiation intensity were taken inside and outside the greenhouse dryer. These data are used for the determination of thermal performance of active greenhouse dryer. From experimental results, it can be concluded that drying conditions with inlet velocity of air 0,8 m/s is more favorable than inlet velocity of air 1,6 m/s as obtained thermal efficiency of active greenhouse is higher.
Co-Authors Andreas Pujianto Djoko Prasetyo Muhfizar, Muhfizar Prabowo Prabowo Prabowo Prabowo Prasetyo, Djoko Pujianto, Andreas