Experiment of nano-capillary boiling phenomenon of graphene nano-based heat pipe on water as working fluids have been carried out. The coating process is carried out by performing an electrophoretic deposition process using graphene nanofluid. Graphene nanofluid was made by heating and stirring for 15 minutes in a solution consisting of graphene and distilled water with a fraction volume of 1%, then followed by an EPD process by dipping a copper pipe into a nanofluid which was given a platinum anode and 23 volt of electricity for 15 seconds. Boiling phenomena can be observed from the results of data retrieval through high-speed visualization cameras while observing thermal performance through temperature data retrieval. Based on the results obtained, the nanocoated heat pipe thermal performance is better than the uncoated heat pipe. The nanocoated heat pipe could handle higher heat flux as shown by the boiling curve at lower temperature difference between heat pipe surface and the saturated water, higher heat transfer coefficient about 215% than the uncoated heat pipe which indicates that the heat transfer phenomena occurred in nanocoated heat pipe is better than uncoated heat pipe. The bubble diameter that formed in the boiling process of nanocoated heat pipe is smaller and released faster than the uncoated heat pipe.
Performance testing of water-cooled chiller integrated with a heat recovery system has been carried out at a hotel in Bali. After commissioning, testing is carried out for 2 days to determine the readiness of the components in operation. The coefficient of performance which is the reference in this study is used to determine the performance of the system with a capacity of 275 tons of refrigeration which is divided into the coefficient of performance of the refrigeration system and the coefficient of performance of the total integrated system. Data was collected with 8 hour intervals starting at 06.00, 14.00, and 22.00 Wita every day. This condition is based on the prediction of the cycle of changes in energy use in the hotel, which includes breakfast, hotel check-in and bedtime. From the research results, it was found that with the condition and situation of the hotel were not measured properly and the occupancy rate of the hotel which was not yet maximal resulted in a greater refrigeration capacity on the second day, but this was also followed by a large demand for compressor power. Although in the end the coefficient of performance was slightly larger than day 1. It was also found that the greatest need for heat transfer rate is required at 22.00 Wita during the 2-day test. This is possibly due to the need for hot water for hotel guests to shower at night. In general, an increase in the coefficient of performance is still possible if there is an increase in hotel occupancy rates.
Pembangkit Listrik Tenaga Gas (PLTG) merupakan salah satu mesin pembangkit yang digunakan PT. Indonesia Power UP Bali dalam kegiatan industri pembangkit di Indonesia. Dalam pengoperasiannya mulai tahun 1994 hingga sekarang mesin PLTG masih menggunakan minyak solar/HSD sebagai bahan bakar pembangkit.Penelitian ini dimaksudkan untuk menganalisa unjuk kerja sistem PLTG khususnya analisa keekonomian dengan membandingkan penggunaan bahan bakar minyak solar dan gas pada mesin pembangkit. Spesific Fuel Consumption (SFC) adalah rasio perbandingan total konsumsi bahan bakar terhadap daya listrik yang dibangkitkan, SFC digunakan sebagai salah satu cara untuk mengetahui seberapa efisien sebuah mesin pembangkit dan salah satu penentu biaya produksi khususnya biaya bahan bakar yang diperlukan dalam pembangkit.Berdasarkan hasil penelitian dengan harga minyak solar/HSD Rp 7300,- /liter dan gas US $ 11 /mmBTU, didapatkan biaya produksi listrik bahan bakar HSD secara aktual sebesar Rp 2541,86 /kWh, secara teoritis Rp 2336,00 /kWh dan gas secara teoritis Rp 1714,3 /kWh. Jika penjualan listrik Rp 1352,- /kWh, maka dengan menggunakan bahan bakar HSD akan berpotensi rugi sebesar Rp 1189,86 /kWh secara akutal, Rp 984,00 /kWh secara teoritis, dan Rp 362,00 /kWh dengan menggunakan bahan bakar gas. Gas Power Plant (PLTG) is one of the power plant used by PT. Indonesia Power UP Bali in the power plant industry in Indonesia. In operation from 1994 until now the PLTG engine is still using diesel oil / HSD as fuel generator. This research is intended to analyze the performance of PLTG system, especially economic analysis by comparing the use of diesel fuel and gas in generating machine. Specific Fuel Consumption (SFC) is the ratio of total fuel consumption to electric power generated, SFC is used as one way to find out how efficient a generating machine and one determinant of production cost, especially fuel cost required in generating. Based on research results with the price of diesel oil / HSD Rp 7300, - / liter and gas US $ 11 / mm BTU, the actual cost of producing HSD fuel electricity is Rp 2541,86 / kWh, theoretically Rp 2336,00 / kWh and gas theoretically Rp 1714.3 / kWh. If the sale of electricity is Rp 1352, - / kWh, then using HSD fuel will potentially loss as much as Rp 1189.86 / kWh on a theoretical basis, Rp 984.00 / kWh theoretically, and Rp 362.00 / kWh using gas fuel .
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