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Lopez-Navarro A.,Institute Ingenieria Energetica IIE | Biosca-Taronger J.,Institute Ingenieria Energetica IIE | Torregrosa-Jaime B.,Institute Ingenieria Energetica IIE | Corberan J.M.,Institute Ingenieria Energetica IIE | And 2 more authors.
Energy and Buildings | Year: 2013

In this paper, the discharge of an experimental ice-storage tank is analyzed. The storage tank is an internal melt-ice-on-coil system. The discharge process has been studied for different mass flow rates and supply temperatures in the range from 10 °C to 15°C. The results indicate that once the ice breaks and floats toward the top of the tank, convection in the ice/water mixture is enhanced and the heat transfer fluid in the top coils becomes colder than in the bottom coils. Thus, an increase of the cooling power is generally observed around the ice-breaking point. Two correlations have been developed to reproduce the effect of the mass flow rate and supply temperature on the discharge duration and the mean cooling power. © 2012 Elsevier B.V.

Ortiz M.,University Miguel Hernández | Valero S.,University Miguel Hernández | Gabaldon A.,Technical University of Cartagena | Alvarez C.,Institute Ingenieria Energetica IIE
International Journal of Power and Energy Systems | Year: 2013

This work presents a mathematical tool applicable to the characterization and classification of power system events. Disturbances without a periodic pattern or with a nonlinear pattern require a more suitable tool than the Fourier series (Fast Fourier or Windowed Fourier Transforms). To overcome the difficulties, other tools have been broadly used in the past years, such as the Wavelet Transforms. However, these transforms have also some drawbacks that the Hilbert Huang Transform technique could mitigate. In the paper the technique is applied to create the input vector database suitable for using a neural network methodology.

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