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All Journal LONTAR Jurnal Teknik Mesin Undana (LJTMU )
Nurhayati Nurhayati
Program Studi Teknik Mesin, Fakultas Sains dan Teknik Universitas Nusa Cendana
Mechanical Engineering

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Studi Eksperimental Skala Laboratorium Rumah Pengering Kopi Menggunakan Plastik Ultra Violet (UV Solar Dryer) Dengan Mekanisme Konveksi Paksa Riky Yonerto Runesi; Verdy A. Koehuan; Nurhayati Nurhayati
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 7 No 02 (2020): Oktober 2020
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v9i02.3345

Abstract

The utilization of solar radiation in the greenhouse effect dryer (ERK) is an alternative to overcome the drying process constraints. The drying process in direct sunlight, which is common in the community, has drawbacks, such as low capacity and takes a long time, and the risk of contamination and disturbance from animals during the drying process. Meanwhile, the quality criteria for coffee beans include physical aspects, taste, and cleanliness as well as uniform and consistent aspects which are largely determined by the treatment at each stage of the production process. The drying process uses ultraviolet plastic (UV solar dryer) to absorb solar radiation and the heat is trapped, then it is used for the drying process of the material. The problem studied is how the performance of the coffee bean drying house through experimental studies using ultraviolet plastic (UV solar dryer) using the forced convection mechanism. The purpose of this study was to determine the efficiency of the coffee bean drying house and the drying rate on the speed of the outflow of air through the exhaust fan. Drying time starts from 11.00 to 15.00 with a total initial coffee weight of 53.37 kg (drying capacity 7.76 kg/m2) and an initial moisture content of 45.5%. From the experimental results, the temperature distribution in the dryer house with an increase in the outflow velocity through the exhaust fan, the air temperature distribution in the dryer house tends to be uniform. However, the variation in flow rate shows the highest coffee bean drying rate at an exit speed of 1.0 m/s, with an efficiency of 9.68% and specific energy consumption of 32799.64 kJ/kg
Studi Eksperimental Rumah Pengering Kopi Menggunakan Plastik Ultra Violet (Uv Solar Dryer) Dengan Mekanisme Konveksi Alamiah Sam Budi; Verdy A. Koehuan; Nurhayati Nurhayati
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 7 No 02 (2020): Oktober 2020
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.1234/ljtmu.v9i02.3346

Abstract

Ultraviolet solar dryer atau biasa disebut juga metode pengeringan dengan menggunakan efek rumah kaca (ERK) merupakan metode pengeringan yang memanfaatkan energi surya sebagai sumber energi utama. Radiasi dari sinar matahari diserap langsung oleh plastik UV yang berfungsi sebagai penghantar dan penahan panas sehingga temperatur didalam suatu tempat atau ruangan yang ditutupi oleh plastik UV ini tetap terjaga. Studi eksperimental rumah pengering kopi menggunakan plastik ultra violet (uv solar dryer) dengan mekanisme konveksi alamiah ini dilakukan dengan menggunakan metode eksperimen. Tujuan untuk mengetahui waktu pengeringan biji kopi terhadap distribusi temperatur ruangan rumah pengering dengan mekanisme konveksi alamiah. Hasil pengujian menunjukkan pengaruh waktu pengeringan biji kopi terhadap distribusi temperatur di dalam ruangan rumah pengering dengan mekanisme konveksi alamiah. Pengaruh waktu pengeringan terhadap distribusi temperatur ruangan rumah pengering terlihat sedikit fluktuatif. Namun rata-rata temperatur ruangan dari beberapa titik pengukuran relatif seragam dengan nilai lebih tinggi dari lingkungan. Nilai kadar air basis basah 3,17 %, basis kering 3,07 % dan rata – rata kadar air akhir biji kopi 20,45%, laju pengeringan 0,77 %bb/jam, dan efisiensi rumah pengering 4,84 %.
Analisis Potensi Angin Sebagai Sumber Penggerak Turbin Angin Savonius Di Kabupaten Timor Tengah Selatan (TTS) Ironis R. Naitio; Arifin Sanusi; Nurhayati Nurhayati
LONTAR Jurnal Teknik Mesin Undana (LJTMU ) Vol 8 No 01 (2021): April 2021
Publisher : Jurusan Teknik Mesin, Fakultas Sains dan Teknik, Universitas Nusa Cendana

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

Abstract

Wind energy is an energy that cannot be separated from our daily lives. Wind is one of the renewable energies that will never run out. In addition, wind energy also does not produce pollution that can disturb the environment. This makes wind energy as one of the alternative energy that has great potential, so it is necessary to conduct research for wider utilization and in long -term use. Savonius wind turbine is one of the vertical shaft turbines (VAWT) where the savonius wind turbine has a main rotor that rotates vertically, and can utilize wind from all directions, and can work/rotate at low wind speeds. The method of data analysis that I can use in this research is to take data directly and simultaneously on wind speed, turbine rotation, and others. The results of data analysis obtained: (1) the highest average wind speed for 1 month is 5.62 m/s with a turbine rotation of 845.36 rpm (2) The highest turbine power is 104 W (3) Turbine effective power is 28.08 W (4) and The highest average efficiency is 23.34 % and the lowest is 8.86 %.
Co-Authors Arifin Sanusi Ironis R. Naitio Riky Yonerto Runesi Sam Budi Verdy A Koehuan