Atmosphere Water Harvester (AWH) was investigated to get water collected from air in elevated performance. Improvement was performed by introducing a series-arrangement of two evaporators. Air flew through the evaporators in cross-flow. This arrangement would influence performance of the AWH system in title of COP, MHI, and specific energy consumption. The AWH was designed using vapor compression refrigeration system. Parameter measured to the system were refrigerant temperature in suction and discharge line, inlet and outlet pipe wall temperatures at evaporator and condenser, air velocity enter into evaporator, and electrical energy consumption. Instrument used in this research were refrigerant pressure-temperature gauge, K-type digital thermometer, digital fan anemometer, thermo-hygro meter, and kWh meter. Air temperature and RH data were 36,5 oC, 40%, and 19 oC, 42 % for inlet and outlet air stram at evaporator, subsequently. With air velocity 1.5 m/s, the COP of the system was 3.7. Water collected from AWH was 1.1 litres/hour with energy consumption of 1.24 kWh. The AWH could be considered as a water harvester with value of specific energy of 1.13 kWh/litre and MHI of 0,2.
Cooling tower is a heat exchanger used to cool water from the condenser. The process is carried out by contacting water with air directly and discharged into the atmosphere using air fluid that is flowed naturally or flowed by a fan. Cooling tower type used in PLTP Kamojang Unit 5 is Induced draft Counter Flow. This equipment more important in increasing turbine efficiency, therefore special treatment is needed by knowing and observing the performance of the Cooling tower so that it can be analyzed in actual conditions and make decision steps in carrying out further repairs and maintenance, this is the basis of research that will be carried out by looking for value and the Cooling tower performance trendline. The calculation method uses the standard ASME PTC 23-2003 and CTI ATC-105 where the results are the calculation baseline and the historical trendline of Cooling tower performance based on the parameters of the 3-cell Cooling tower operating conditions. The parameters tested are by taking 5 valid data on PLTP KMJ Unit 5, then the Tower Capability performance values are obtained as follows, namely in the initial commissioning conditions the performance value is 92,1%, Q1 2021 is 78,8%, Q3 2021 is 74, 3%, Q4 2021 is 84,7%, and Q1 2022 is 83,8%. There was a decrease in Q3 2021. Then there was an increase in the trend in Q4 2021 due to previous overhaul activities on the Cooling tower. Keywords: Cooling tower, trendline, overhaul, tower capability
Di Indonesia, proses panen garam dari meja garam dilakukan oleh manusia dengan menggunakan sekop. Proses tersebut tidak produktif karena keterbatasan tenaga manusia yang melakukan di bawah lingkungan panas terik matahari. Untuk itu, konsep desain mesin panen garam dikemukakan dan dievaluasi. Metode dalam mengonsep desain mesin panen garam merujuk pada metode desain rekayasa dari Pahl dan Beitz, yang dimulai dari dekomposisi fungsi hingga keputusan memilih konsep desain terbaik. Konsep desain mengarah bahwa mesin panen garam tersebut digunakan untuk mengambil garam dari meja garam dan memindahkannya kedalam karung. Semua fungsi dilakukan dalam satu mesin dan digerakkan oleh suatu penggerak mula. Sedangkan pengendalian terhadap jalannya mesin dilakukan oleh manusia atau operator. Beberapa kriteria desain mesin diantaranya adalah kapasitas 25 kg garam per batch, dan berat mesin yang didukung oleh meja garam tidak lebih dari 30 kg untuk menjamin geoisolator meja garam tidak rusak. Tujuan dari evaluasi ini untuk mendapatkan konsep desain mesin terbaik yang produktif dan memenuhi kriteria. Tahap evaluasi desain meliputi dekomposisi fungsi, pengembangan konsep dengan bantuan matriks morfologi dan evaluasi kelayakan, yang menentukan apakah desain tersebut lolos atau tidak dengan menggunakan matriks keputusan. Secara teknis, beberapa konsep desain diajukan dan kemudian dikembangkan dengan dasar kriteria atau batasan-batasan desain. Hasilnya adalah suatu konsep desain mesin panen garam yang efisien, produktif, dan ramah lingkungan, yang direkomendasikan untuk selanjutnya dibuat prototipe virtual dan diuji.
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