This paper reports the conceptual design of a household kitchen food waste composter. Several conceptual approaches, such as Quality Function Deployment (QFD), Concept Generation, and Concept of Evaluation using PUGH Method are implemented. The component selection is applied using House of Quality method, and the final design is presented and selected using PUGH Method. Design 1 is selected as the best composter design. The material selection and the cost of the components are also presented. The conceptual design approach highlights its benefit as the preliminary method in designing the food waste composter.
Depletion of fossil fuel caused mankind to look for sustainable and green energy resources. The characteristic of hydrokinetic turbine with ability to operate at low head stream and at low cost made it a good choice for use to harness hydro source of energy. As hydrokinetic turbine gain attention from the industry player, many experimental and Computational Fluid Dynamics (CFD) studies related to hydrokinetic turbine have been carried out. Yet the relationship of flow depth variation and wake recovery behind the turbine is still not fully understood. There is limited study about the effects of flow depth variations on the wake recovery behind the turbine. In this paper, a CFD model investigation was done based on published experimental work. A hydrokinetic water turbine was drawn using the MHKF1-180 and NACA4418 foils dimensions. The transient CFD study was conducted using SST k-w turbulence model and dynamic mesh method. The results showed that in near wake region, the wake at deeper depth will recover faster seemingly due to pressure change at that depth and the faster rate of momentum transfer of the fluid. It can be concluded that the deeper the placement of the turbine inside the water channel, the faster the wake recovers. The wake recovery results as presented in this paper should be considered when placing set of turbines especially in array arrangement to obtain a more efficient energy conversion.
3D-printed coreless generator has been presented for energy harvesting applications using permanent magnet as source of external magnetic field in the rotor. The phototype of proposed coreless generator is built using 3D-printer with Black Polylactic Acid (PLA) as a filament for stator housing, rotor and other parts. The major parts of the proposed coreless generator are the stator, which has four coils of winding copper wire and the rotor with eight permanent magnets which are arranging N and S magnet poles alternately. This research is conducted to determine how much power can be generated from the proposed 3D-printed permanent magnet generator. The prototype permanent magnet generator is tested with rotational speed and load condition. The experimental results have been shown that the coreless generator can generate the electrical energy up to 5 W at 6000 rpm.
Finite Element Analysis is commonly used for product designer to visualize the structural analysis of a product. Not much works done by these designers using Computational Fluid Dynamic, CFD due to the complexity of the application. In this study, the dynamic of the water flow within the turbine had been predicted as the preliminary design steps. Several significant parameters had been reviewed and tested using CFD tool to give better insight of the important components of the turbine on its performance, in terms of the velocity, the pressure and the vorticity of the water. Three different velocities were used which was 5 m/s, 9.9 m/s and 13 m/s. The maximum outlet velocity that can be produced at various inlet velocity were predicted to be 17.09 m/s, 33.79 m/s, and 44.37 m/s. The pressure gradients were 159 kPa, 618 kPa, and 107 kPa. Meanwhile, the vorticities were 48.28 m/s, 91.66 m/s, and 120.5 m/s. Furthermore, the vorticity distribution was observed through the simulated work.
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