The flow visualization of vertical axis Savonius current turbine has been investigated numerically by using Myring formula n of 1. Computational Fluid Dynamics or CFD approach has been carried out by using Gambit for geometry and ANSYS 17.0 running to solve the incompressible U-RANS. This work has been done by comparing the performance between Myring and conventional Savonius. The y+ in the first layer of blade surface has been made between 30 and 100 with y+ in about 52. The turbulence model will be chosen the Realizable k-epsilon (RKE) for this turbine case. The numerical obtain the torque and power coefficient and the power coefficient called the turbine performance. The numerical simulation has been validated by experimental results towards torque coefficient. The results have indicated that the Myring formula n = 1 have the best performance compared this one by decreasing the pressure in attached flow area.
The study of air velocity inside the cooling tower gives an overview of the process of heat or mass transfer. This study developed mathematical modelling based on the principle of continuity and statistical thermodynamics to track changes in radius, velocity, density, and temperature of droplets and air along with the droplet trajectory or tower height. Before that, the droplet radius range is predicted in advance to get the accuracy of the calculation. Also, water capacity and fan rotation are varied to determine their effect on cooling tower performance. The calculation results showed that 18 Lpm capacity gives efficiencies above 50%, while for 0.5 Lpm capacity, it produces efficiencies in between 25% to 40%. The highest efficiency indicates that the evaporation process occurs most efficiently. Mathematical modelling in calculations can also describe the increase in air temperature, which usually uses numerical simulations.
The livelihoods of the coastal areas of the Indonesian people as large fishermen need adequate fishing vessels and fishing equipment. For this reason, it is necessary to develop technology for the implementation of development methods on cheap, measurable and modern fishing vessels. So that a fishing vessel with a capacity of 30 GT was developed with fiberglass material that could be developed in the fabrication process with planned fabrication techniques. In the process of building fiberglass material has the ease of the process of forming the hull and the process of connecting parts of the fishing vessel to be developed. The method used in ship building activities will refer to the system and procedures for the physical construction of fiberglass boats, in accordance with the structure of the construction and fiberglass laminate schedule which is done carefully so that glass content reaches the range of 30-35%, in accordance with marine standards.
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