The study examined the flow characteristics within an LNG cargo pump, specifically focusing on how variations in the geometry of the inducer and inducer casing affect pump performance. LNG cargo pumps are essential for transferring LNG from carriers' storage tanks to onshore facilities. The inducer significantly influences the pump's suction performance, making it crucial for efficient LNG transfer. Given that the inducer often operates under challenging conditions, computational fluid dynamics (CFD) analysis was conducted on various geometric configurations. The analyses assessed velocity, pressure, efficiency, head, and pressure loss coefficient. Among the configurations studied, Case 4 exhibited the lowest efficiency and head, although the differences compared to other cases were minimal. Notably, Case 4 demonstrated more uniform pressure distributions and stable velocity profiles. Additionally, its pressure loss coefficients were 34.9% and 10.9% lower than those of Case 1 and Case 2, respectively, indicating enhanced flow stability and reduced energy loss. Overall, within the design parameters of this study, Case 4 emerged as the most optimized configuration for stable LNG transport.

Power electronic systems have been widely applied in both industrial and domestic applications in the modern society for controlling and converting electrical energy. Due to their characteristics, such as excellent performance, low cost, high reliability, and low weight and size, power semiconductors, including insulated-gate bipolar transistors (IGBTs) dominate the market of power converters. The technical progress and development trend of IGBT for industrial applications are primarily driven by five aspects influenced by each other to an extent, including operating temperature, efficiency, dimension, reliability, and cost. Liquid cooling systems surpass the air cooling systems by supplying heat transfer coefficient, which is several orders of magnitude higher. Thus, using liquid cooling system enables much higher power densities of power modules and more compact converter solutions.

The high voltage direct current (HVDC) device has been used to transmit electrical power with an advanced technology of semiconductors. The sustainable energy generation technologies of solar power and windmills are demanding that the HVDCs have high performance and reliability. In this regard, the cooling performance of the HVDC becomes a significant research topic because the temperature increase affects the operation of the device. The evaluation system to assess the cooling performance has been developed and is proposed in this paper. The experimental apparatus is presented in detail. Our experiments have shown the accuracy of flow rates, pressure drops, and the temperatures in the desired measurement points. We have successfully developed an evaluation system of the cooling performance of the HVDC device which has 2.48 kW of heat dissipation.