The power harvester unit from flow-induced vibration (FIV) was designed to harness energy from low flow velocity based on the magnetostrictive effect on the galfenol (Fe – Ga alloy) strip induced by the oscillating bluff body. This study aimed to investigate the cross-section variation’s effect on the FIV characteristics and the magnetostrictive material’s performance for the bladeless power generator. The generator model’s vibration characteristics and performance tests were conducted in the wind tunnel test using the wind-receiving unit (WRU) variation. The results showed that the resonance reduced-velocity (Vr) were around 3.7 and 4.0 for rectangular and circular cylinders, respectively. Furthermore, the effect of rectangular depth variation on the power generation output is linear to the test models’ displacement rate and vibration frequency. The harvester’s maximum power generation was 5.25 mW, achieved using the rectangular prism with depth D = 0.4H. The power coefficient was also evaluated for different wind-receiving models. The harvester model lit up 54 LED lamps in the wind tunnel test. The voltage output is sufficient to provide electric power resources for an IoT system, sensor, and wearable or wireless devices. The harvester model successfully generated a voltage signal under the initial field test with an ambient wind velocity of 0.9 – 2.71 m/s. Therefore, this study recommends the development of bladeless power generators in the future.

La Hasanudin 1,Yuspian Gunawan 2, Ridway Balaka 3, Agustinus Lolok 4, Budiman Sudia 5, Aminur 6, Al Ichlas Imran 7, Salimin 8, Samhuddin 9, Prinob Aksar 10 Teknik Mesin Universitas  Halu OleoTeknik Elektro Universitas Halu OleoTeknik Mesin Sekolah Tinggi Mekongga Kolaka                                                    Email :      La.hasanudin@uho.ac.id                        Email : Agustinus.gio@yahoo.co.id ABSTRAK Konsumsi bahan bakar spesifik (SFC) dalam pembangkit listrik tenaga uap sangat penting untuk diketahui karena terkait dengan perbandingan total konsumsi bahan bakar, di mana Pembangkit Listrik Tenaga Uap Nii Tanasa menggunakan bahan bakar batubara terhadap tenaga listrik yang dihasilkan oleh generator listrik. Hal ini dilakukan untuk mengetahui seberapa efisien pembangkit listrik di industri pembangkit listrik di pembangkit listrik tenaga uap di Nii Tanasa dan juga untuk kemungkinan nilai kalor bahan bakar yang akan digunakan untuk pembakaran. Tujuan dari penelitian ini adalah untuk menganalisis Konsumsi Bahan Bakar Spesifik yang dibutuhkan dalam pembangkit listrik tenaga uap. Metode yang digunakan adalah metode langsung, input yang diperlukan adalah Gross kWh, Net kWh, penggunaan bahan bakar batubara. Jenis bahan bakar yang digunakan adalah lignit rendah kalori. Hasil Konsumsi Bruto pada bulan Januari terlihat 1,08 kg / kWh sedangkan Konsumsi Bahan Bakar Bersih adalah 1,25 kg / kWh. Pada bulan Desember nilai Konsumsi Bahan Bakar Spesifik Bruto adalah 1,04kg / kWh sedangkan jumlah Konsumsi Bahan Bakar Spesifik adalah 1,17kg / kWh. Nilainya relatif tinggi pada kapasitas ≤ 100 MW.Kata Kunci: Specific fuel consumption, Tenaga Uap, batu bara, Listrik, Pembakaran

This study aims to: (1) determine the heat transfer process of the room area; (2) to determine the effect of sensible heat load on the performance of air conditioner / AC. This study used an experimental method to obtain data on the temperature of the external coolant load, the load on the inner cooler, the area of the room and the surface area data for each cooling load. The results of this study indicate that: the heat load greatly affects the performance of the air conditioner (AC) in producing a comfortable temperature in the room, such as in the meeting room of the BNN Province of SULTRA using 2 PK AC capacity with a total cooling load of 34,979 Btu / hr or 8,744.75 kcal, so that you have to add an AC unit with a minimum capacity of 2 PK to obtain the calorific value that can be moved by the AC (Q1) is greater than the heat load generated by the room (Q2), which is 36,000 Btu / hr> 34,979 Btu / hr or 9,000 kcal> 8,744.75 kcal so that comfortable conditions will be obtained.

The furnace is a device used to convert potential energy into heat energy. Furnace for the community is one of the important tools for cooking. Combustion is the reaction of a substance with oxygen (O2 ). Combustion is one of the most widely used biomass energy conversions because it produces direct thermal energy. The purpose of this research is to analyze the number of holes and analyze the comparison of burning briquette stoves with kerosene stoves. The data collection method is carried out by direct observation of the community and collecting references from related books and journals. Analysis conducted on the number of holes in the briquette stove (21, 33 and 43) shows the most effective results in the use of briquette stoves are briquette stoves which have 43 holes. The time to heat the water is 15 minutes with the same amount of water and fuel volume, the water volume is 500 ml and 600 grams of fuel and the final temperature is 100 oC. The heating time of kerosene stove is 12 minutes and the heating time of briquette stove is 15 minutes.Keywords: Briquette stove, hole variation, design, combustion, efficiency

Net heat plant race (NPHR) adalah jumlah energi input yang dibutuhkan untuk menghasilkan energi listrik dari pembangkit, semakin tinggi nilai NPHR, semakin rendah efisiensi termal pembangkit listrik tenaga uap. Penelitian ini bertujuan untuk menganalisis nilai perlombaan panas pembangkit listrik netto (NPHR) dari pembangkit listrik tenaga uap. Metode yang digunakan dalam penelitian ini adalah dengan menggunakan metode Direct(Langsung), yaitu bahan bakar akan dibandingkan langsung dengan energi output yang dihasilkan. Hasil penelitian menunjukkan Net Race Heat Value (NPHR) Nilai rata-rata 4.986,87 kkal / kWh pada Januari 2018 dan nilai rata-rata 5.080,40 kkal / kWh pada Juni 2018. Ini menunjukkan bahwa nilai tersebut relatif tinggi untuk kapasitas daya ≤ 100 MW .