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All Journal Widyariset Widyariset Interdisciplinary Social Studies
Nasruddin Nasruddin
Universitas Indonesia
Aerospace Engineering Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Neuroscience Physics Public Health Social Sciences

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THE DESIGN AND TESTING OF ADSORPTION REFRIGERATION SYSTEM WITH TWO ADSORBERS Andi Taufan; Nasruddin Nasruddin
Widyariset Vol 16, No 2 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (323.233 KB) | DOI: 10.14203/widyariset.16.2.2013.269-276

Abstract

This paper discusses design and testing of adsorption refrigeration system with two adsorbers. Main components consisted of two adsorber with 6.6 kg solidified activated carbon inside, expansion valve, evaporator, condenser, and reservoir. All of that were connected with stainless steel pipes. The test performed for 75 minutes using 250 ml of methanol pro-analysis of 99.9% as a refrigerant in the system and the water temperature is 250C which is pumped through copper pipes to cool the adsorbents. The air pressure in the system during the test were in vacuum. The average pressure difference between the adsorber and the evaporator during testing was 4.6 cmHg. The lowest temperature was 140C obtained after the 65th minute.
THE DESIGN AND TESTING OF ADSORPTION REFRIGERATION SYSTEM WITH TWO ADSORBERS Andi Taufan; Nasruddin Nasruddin
Widyariset Vol 16, No 2 (2013): Widyariset
Publisher : Pusbindiklat - LIPI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (323.233 KB) | DOI: 10.14203/widyariset.16.2.2013.269-276

Abstract

This paper discusses design and testing of adsorption refrigeration system with two adsorbers. Main components consisted of two adsorber with 6.6 kg solidified activated carbon inside, expansion valve, evaporator, condenser, and reservoir. All of that were connected with stainless steel pipes. The test performed for 75 minutes using 250 ml of methanol pro-analysis of 99.9% as a refrigerant in the system and the water temperature is 250C which is pumped through copper pipes to cool the adsorbents. The air pressure in the system during the test were in vacuum. The average pressure difference between the adsorber and the evaporator during testing was 4.6 cmHg. The lowest temperature was 140C obtained after the 65th minute.
Evaluation of Wind Energy Potential for Electricity Generation in Three Locations of Zanzibar, Tanzania Hamza Khamis Kombo; Ridho Irwansyah; Nasruddin Nasruddin
Interdisciplinary Social Studies Vol. 5 No. 1 (2025): Regular Issue: October-December 2025
Publisher : International Journal Labs

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55324/iss.v5i1.955

Abstract

This study evaluates the wind energy potential for electricity generation in the North, South, and West regions of Zanzibar using wind speed data from NASA POWER (2014–2023). The Weibull statistical distribution indicated annual average wind speeds of 5.43 to 5.81 m/s. The South Region experienced the highest wind stability (k=7.97 in 2015), while the North had the greatest energy-carrying wind speed (6.80 m/s in 2020). Wind power density ranged from 107.87 to 132.98 W/m², and energy density varied from 944.91 to 1164.94 kWh/m²/year, confirming that all sites fall into Class 2 (Marginal) of the Pacific Northwest Laboratory standard—implying weak feasibility for large wind farms but suitability for small- to medium-scale or hybrid schemes. A technical-economic analysis of four turbines identified the De Wind D7 (1500 kW, 70 m hub height) as the most suitable, with the highest annual energy production (>1300 MWh/year) and capacity factor (>10%). The study provides crucial data to inform investments and policies for diversifying Zanzibar's energy mix and fostering sustainable development.
Co-Authors Andi Taufan Hamza Khamis Kombo Ridho Irwansyah