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Abstrak :
Pada penelitian ini dilakukan analisis potensi optimasi pada sistem pengkondisian udara (chiller) untuk mengatur temperatur dan humidity ruang pengecatan mobil (top coat booth) di salah satu industri otomotif terbesar di Indonesia. Analisis optimasi yang dilakukan meliputi analisis penggunaan thermal storage tank (cold water storage), potensi penurunan cooling load pada top coat booth, analisis computional fluid dynamic (CFD) untuk aliran udara dingin pada top coat booth dan optimasi total exergy destruction dari keseluruhan sistem sekaligus total product component and energy cost keseluruhan sistem (multi objective optimization). Dari hasil optimasi didapatkan bahwa sistem chiller dapat berjalan lebih optimal dengan tanpa thermal storage yang berdimensi terlalu besar serta tedapat potensi penghematan energi sebesar 2646.4 kW cooling load. Dengan merubah desain sisi masuk top coat booth bisa juga didapatkan cooling load yang lebih kecil. Dari multi objective optimization didapatkan pula nilai variabel-variabel penting sehingga sistem chiller dapat berjalan lebih optimal secara termodinamika (minimal exergy destruction), optimal secara ekonomi (minimal component and energy cost) dan optimal secara termodinamika sekaligus juga ekonomi. Dari nilai-nilai variabel optimal tersebut didapatkan equivalent cooling cost sebesar 621.02 (Rp/kWh) untuk base case, 588.86 (Rp/kWh) untuk economic optimized, 611.50 (Rp/kWh) untuk thermodynamic optimized dan 595.72 (Rp/kWh) untuk multi objective optimized. ......The optimization of the air temperature- and humidity conditioning of a top coat booth at one of the biggest automotive industry in Indonesia has been considered. The optimization analysis consists of the thermal storage utilization analysis (cold water storage), the potential of cooling load reduction at top coat booth, the computational fluid dynamic (CFD) analysis for air flow in top coat booth and the multi-objective optimization (optimization of the total exergy destruction of the system simultaneously with the total product component and energy cost of the system) The results have shown that without the large thermal storage tank, the chiller could save 2646.4 kW of cooling capacity. By redesign the inlet- and outlet side of top coat booth, the cooling load could be also significant reduced. Three optimized values of decision variables for a single objective thermodynamic optimized, a single objective economic optimized and a multi objective optimized are also obtained. From the optimized values of decision variables, it could be obtained the equivalent cooling cost of 621.02 (Rp/kWh) for base case, 588.86 (Rp/kWh) for economic optimized, 611.50 (Rp/kWh) for thermodynamic optimized and 595.72 (Rp/kWh) for multi objective optimized.

Abstrak :
Penelitian ini membahas optimasi sistem ventilasi dan tata udara untuk Instalasi Penyimpanan Sementara Bahan Bakar Nuklir Bekas dari Reaktor Riset G.A. Siwabessy. Keterbaruan dari penelitian ini adalah didapatkannya beberapa persamaan yang diperlukan. Optimasi yang dilakukan pada penelitian ini selain untuk Instalasi Penyimpanan Sementara Bahan Bakar Nuklir Bekas yang sudah ada juga untuk Instalasi Penyimpanan Sementara Bahan Bakar Nuklir Bekas tipe kering yang saat ini belum dibangun. Hasil dari penelitian ini menunjukkan bahwa beberapa persamaan yang dikembangkan pada penelitian ini bisa dibuktikan mendekati hasil eksperimen.

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This study discusses an optimization of ventilation and air conditioning systems for the Interim Storage of Spent Nuclear Fuel Fuel from the G.A Siwabessy Research Reactor. The novelty of this research is to gain several equations needed for the optimization. The optimization in this study is in addition to the existing wet interim storage also for a dry storage that is currently still not built. The results of this study indicate that the equations developed in this study are consistent with the experimental results.

Abstrak :
This study proposes a method of optimizing the dry storage design for nuclear-spent fuel from the G.A. Siwabessy research reactor at National Nuclear Energy Agency of Indonesia (BATAN). After several years in a spent fuel pool storage (wet storage), nuclear spent fuel is often moved to dry storage. Some advantages of dry storage compared with wet storage are that there is no generation of liquid waste, no need for a complex and expensive purification system, less corrosion concerns and that dry storage is easier to transport if in the future the storage needs to be sent to the another repository or to the final disposal. In both wet and dry storage, the decay heat of spent fuel must be cooled to a safe temperature to prevent cracking of the spent fuel cladding from where hazardous radioactive nuclides could be released and harm humans and the environment. Three optimization scenarios including the thermal safety single-objective, the economic single-objective and the multi-objective optimizations are obtained. The optimum values of temperature and cost for three optimization scenarios are 317.8K (44.7°C) and 11638.1 US$ for the optimized single-objective thermal safety method, 337.1K (64.0°C) and 6345.2 US$ for the optimized single-objective cost method and 325.1K (52.0°C) and 8037.4 US$ for the optimized multi-objective method, respectively.