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3. The economics of electricity generation from Gulf Stream currents

Author

Bane, J., de Queiroz, A.R., Neary, V.S., DeCarolis, J.F., Li, B., Keeler, A.G., and He, R.

Abstract

Hydrokinetic turbines harnessing energy from ocean currents represent a potential low carbon electricity source. This study provides a detailed techno-economic assessment of ocean turbines operating in the Gulf Stream off the North Carolina coast. Using hindcast data from a high-resolution ocean circulation model in conjunction with the US Department of Energy's reference model 4 (RM4) for ocean turbines, we examine resource quality and apply portfolio optimization to identify the best candidate sites for ocean turbine deployment. We find that the lowest average levelized cost of electricity (LCOE) from a single site can reach 400 $/MWh. By optimally selecting geographically dispersed sites and taking advantage of economies of scale, the variations in total energy output can be reduced by an order of magnitude while keeping the LCOE below 300 $/MWh. Power take-off and transmission infrastructure are the largest cost drivers, and variation in resource quality can have a significant influence on the project LCOE. While this study focuses on a limited spatial domain, it provides a framework to assess the techno-economic feasibility of ocean current energy in other western boundary currents.

Published
2017
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5. Measuring radio frequency properties of materials in pulsed magnetic fields with a tunnel diode oscillator.

Author

Coffey, T., Bayindir, Z., DeCarolis, J. F., DeCarolis, J.F., Bennett, M., Esper, G., Agosta, C. C., and Agosta, C.C.

Subjects
TUNNEL diode oscillators, RADIO frequency, MAGNETIC fields
Abstract

Tunnel diode oscillators have been used in many types of experiments that measure the properties of materials. We present the details of an apparatus that extend these tunnel diode techniques to measure the properties of materials in pulsed magnetic fields. In the most common version of this method, a sample is placed in the inductor of a small rf tank circuit powered by a tunnel diode and the conductivity, magnetization, or penetration depth is measured. We explain in this article how the sample and configuration of the radio frequency fields determine which property is measured. Our major innovations are to stabilize the tunnel diode oscillator during a magnet pulse by using compensated coils in the tank circuit and the development of two methods, one digital and one analog, to measure the frequency and amplitude shifts in the oscillator during the short (10 s of ms) magnet pulse. We illustrate the power of this new measurement method by showing preliminary results of the superconducting transition and the Shubnikov-de Haas effect in the organic conductor κ-(ET)[sub 2]Cu(NCS)[sub 2]. The Shubnikov-de Haas effect shows particularly high amplitude oscillations due to magnetic breakdown orbits. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]

Published
2000
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