along with technological development and the increase in human population, the electricity needs are increasing every year. However, 94% of a power plant in Indonesia still using fossil fuels that are a pollutant and non-renewable. In addition, NASA said that the earth's temperature had risen by 1°C since 1880 and the current carbon dioxide level was the highest in the last 650,000 years. Therefore, Indonesia needs to improve, in fact, Indonesia is one of the highest emission contributors in the world. Indonesia is not yet 100% electrified, there are still 2,519 villages without electricity. Gravitational Water Vortex Power Plant (GWVPP) is a micro hydro-power plant may answer the problem because it is easy renewable energy to be made and utilized in the NIZ (not interconnected zones) region. This study will examine the changes in the number and shape of the blade, as well as the length of the chord, to know the effect on turbine power so that it can produce higher efficiency at GWVPP. Propeller turbine with a Gottingen 428 airfoil analyzed using Computational Fluid Dynamics (CFD) method. The results show that the number of blades and the length of the chord is inversely proportional to the efficiency of the turbine, and the shape of the blade is more efficient when it's twisted.

To give a considerable time reduction in the calculation of the vortex velocity and in the CPU time, discrete vortex modelling of flows using overlapping grid system for two tandem cylinders is carried out. This simple and time efficient method gives a better scatter of surface vorticity as the vortices around the body are now calculated on grid point. This research is to simulate the loading on structural elements of the structures due to their interaction with anodes or with other members. To show the flow phenomena and interactions involved, the in-line and transverse force coefficients are presented. The comparison of the results with experimental and numerical results and the range for good results is presented.

Indonesia's annual marine fish potential of 6.5 million tons is spread over the waters of Indonesia's Exclusive Economic Zone. The constraint of which are often faced by fishermen is the decay that occurs during the storage process in which the fish becomes less fresh when it comes to the fish auction. The decomposition rate of fish after fishing is strongly influenced by fishing techniques, handling techniques, and onboard storage. The cooling or freezing process is the best method chosen for handling the catched fish to maintain its quality and freshness. This study was conducted by modifying the insulation material of purse seine cargo hold using a coolbox made of insulated materials from coconut coir and Palm Fiber. The purpose of this study is to know the influence of coconut coir and Palm Fiber composite insulation to temperature and cooling time in which will be compared with styrofoam insulated coolbox. The study was conducted by testing some specimens which will be selected with the thermal conductivity and lowest density. The compositions which is chosen were coconut coir and Palm Fiber composite that is mixed with polyurethane glue 4:4:1 ratio, having a thermal conductivity of 0.4643 W/mK and a density of 0.18 g/cm 3. Coolbox's test using coconut coir and Palm Fiber composite insulation was done using a 400 gram fish as a cooling load and ice that had been destroyed weighing 2 kilograms as a cooling source. Coolbox with coconut coir and Palm Fiber composite insulation has the lowest fish temperature of 0.7 o C, while the coolbox with styrofoam insulation has the lowest fish temperature of 1.8 o C. In addition, coconut coir and Palm Fiber composite coolbox is able to keep temperature below 20 o C for 16,5 hours, while with the same treatment styrofoam insulated coolbox is only able to keep the temperature below 20 o C for 16 hours. So it can be concluded the use of coconut coir and Palm Fiber composite is effective as insulation material because it can offset the performance of the insulation styrofoam .

Selama beberapa dekade, negara-negara Asia seperti Korea, Jepang dan China telah memimpin industri pembuatan kapal sejak kemunduran di Eropa dan Amerika. Namun, beberapa negara berkembang seperti Indonesia, India, Brazil, dan lain-lain akan masuk juga ke industri perkapalan.Negara-negara berkembang ini menemukan mitra teknis atau penyedia informasi karena mereka berada dalam situasi pengalaman dan teknologi kecil. Kini, perusahaan pengembang galangan kapal dari negara-negara maju pembuatan kapal mendapatkan kesempatan untuk melakukan bisnis rekayasa melawan negara-negara berkembang tersebut......seperti rencana pemodelan klaster industri perkapalan di Surabaya dan sekitarnya.Titik awal dari model bisnis ini adalah untuk pembangunan galangan kapal baru. Model bisnis ini diawali dengan desain layout galangan kapal. Untuk pelaksanaan desain tata letak galangan kapal, dibutuhkan empat jenis komponen rekayasa.Komponen tersebut adalah teknik sipil, teknik bangunan, rekayasa utilitas dan teknik tata letak produksi. Di antara bagian-bagian ini, teknik tata letak produksi paling penting karena hasilnya adalah pondasi dari bagian teknik lainnya dan ini menentukan kapasitas galangan kapal selama siklus operasi kapalUntuk desain tata letak galangan kapal berada di luar jangkauan persyaratan bisnis karena sebagian besar kasus penelitian hanya ada sedikit pertimbangan tentang perkapalan yang nyata.Dalam tulisan ini, desain tata letak galangan kapal untuk tahap awal dilakukan untuk target galangan kapal yang baru direncanakan dengan metode terpadu yang mampu menangani data master aktual dari galangan kapal.Tulisan / penelitian, metode perancangan tata letak ini dibedakan dari penelitian terdahulu karena data produk aktual dari kapal dan data operasi pembuatan kapal aktual digunakan untuk estimasi area.

The thermal oil system is one type of heater that widely used on ships. The system is an important system used to heat fuel that will be used for the operation of the main engine, auxiliary engine, and boiler. This system has been installed on 17500 LTDW Product Oil Tanker, MT. Parigi, but not yet tested so that it does not know whether the system is able or not to transfer heat from heating equipment (boiler and economizer) to each fuel tank in accordance with the desired value. Therefore, this research performs an engineering evaluation in term of heat transfer analysis to ensure that the heat transfer process of thermal oil from heating equipment to the fuel tanks is already meeting the required temperature or not. This analysis is done by using thermodynamic equation, namely heat balance equation and heat loss equation. The result shows that the heat transfer of thermal oil to each fuel tank corresponds to the desired value, namely 180 o C for the thermal oil inlet temperature to each fuel tank and 140 o C for the thermal oil re-enter temperature to the heating equipment.