A large capacity sodium-immersed self-cooled electromagnetic pump (LEMP) was developed for application to the main circulation pumps of FBR. This advanced LEMP is a submergible annular linear induction pump designed to be self-cooled by immersing into sodium and applying high temperature electrical insulation. Almost all the internal electrical losses were transferred to the surrounding sodium, which can be recovered as electricity by turbine generators. The LEMP having specifications of 160 m 3 /min flow rate, 0.28 MPa head and more than 40% efficiency at the rating was designed, fabricated and tested in the sodium pump test facility. The test involves magnetic field measurement in the air and a variety of sodium tests during 2,550 h, which demonstrated good pump performance and flow controllability, and satisfied the design target. The boundary between flow stability and instability of the LEMP operation could be defined by peak position of the Q-H curve, which was specified by Re m ÂS (magnetic Reynolds' number times slip) of 1.4 to 1.5 at 335 C. Based on the test results, the applicability of the LEMP for the FBR was confirmed.
Synopsis: This study evaluated the lifecycle reduction potential and the payback time of CO 2 originated from general detached household electricity consumption by introducing the DC LED lighting system utilizing photovoltaic power generation and storage battery. Among various DC LED lighting systems, the system with storage battery capacity adjusted to night lighting power demand showed relatively high CO 2 reduction potential. In the system with storage battery capacity extended to whole daytime surplus power generation, shortening of battery lifetime caused by repeated complete discharge should affect lifecycle CO 2 increase of the system. The CO 2 payback time of DC LED lighting system varied between 1.5 and 2 years according as several regional characteristics such as electrical grid CO 2 emission factor, photovoltaic power condition and storage battery lifetime related to the required capacity.
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