Investigación

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Documentos generados por los docentes e investigadores de la Universidad en su labor de investigación científica producida o editada por los departamentos y centros de la Universitat Politècnica de València.

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Browsing Investigación by Sponsor "ACCIONA, S.A."

Now showing 1 - 4 of 4
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    Experimental analysis of a paraffin-based cold storage tank
    (Elsevier, 2013) Torregrosa-Jaime, Barbara; López-Navarro, Alejandro; Corberán, José M.; Esteban-Matías, J. C.; Klinkner, L.; Payá-Herrero, Jorge; ACCIONA, S.A.
    [EN] The aim of this study is to characterize a paraffin-based cold storage tank. Novel experimental results are presented for this system which combines a significant amount of paraffin (1450 kg) immersed around 18 spiral-shaped coils disposed in counter-current flow. The paraffin has a phase-change temperature in the range 4 8 °C as measured by a 3-layer calorimeter. Different tests have been carried out with a constant mass flow rate and supply temperature. Around 31% of the paraffin has hardly any contact with the coils and hereby acts as a dead mass. The results show the importance of natural convection within the phase-change-material, particularly during the melting process. The highest efficiency has been achieved for the lowest supply temperatures and mass flow rates of the heat transfer fluid.
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    Experimental investigation of the temperatures and performance of a commercial ice-storage tank
    (Elsevier, 2012) López-Navarro, Alejandro; Biosca Taronger, Javier; Torregrosa-Jaime, Barbara; Martínez Galván, Israel Octavio; Corberán, José M.; Esteban-Matías, J. C.; Payá-Herrero, Jorge; ACCIONA, S.A.
    [EN] This paper presents the results of an experimental installation with an internal melt-ice-on-coil tank which has a total capacity of 172 kWh. The aim of this work is to analyse the freezing process in a tank with counter-current spiral-shaped coils immersed in around 1855l water. An experimental campaign has been performed with different inlet temperatures and mass flow rates of the heat transfer fluid. This study analyses (i) the chiller performance, (ii) the ice-formation process and (iii) the energy consumption of the installation. Supply temperatures between 2.5 C and 5.2 C have been sufficient to charge the tank without using any nucleating agents. The lowest energy consumption has been achieved for the fastest charging tests.
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    Experimental investigations on the influence of ice floating in an internal melt ice-on-coil tank
    (Elsevier, 2013-02) López Navarro, Alejandro; Biosca Taronger, Javier; Torregrosa Jaime, Bárbara; Corberán Salvador, José Miguel; Bote García, J.L.; Payá Herrero, Jorge; Dpto. de Termodinámica Aplicada; Instituto Universitario de Investigación de Ingeniería Energética; Escuela Técnica Superior de Ingeniería Industrial; ACCIONA, S.A.
    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 ºC to 15 ºC. 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.
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    Performance characterization of a PCM storage tank
    (Elsevier, 2014-04-15) López Navarro, Alejandro; Biosca Taronger, Javier; Corberán Salvador, José Miguel; Peñalosa, C.; Lázaro, A.; Dolado, P.; Payá Herrero, Jorge; Dpto. de Termodinámica Aplicada; Instituto Universitario de Investigación de Ingeniería Energética; Escuela Técnica Superior de Ingeniería Industrial; Ministerio de Ciencia e Innovación; ACCIONA, S.A.
    This paper presents the experimental results of a versatile latent heat storage tank capable of working with organic phase-change materials within a temperature range from -10 °C to 100 °C. The tank contains a paraffin with a phase-change temperature between 3 °C and 8 °C. Firstly, this study focuses on explaining the design criteria which were followed to build the tank. Secondly, a full experimental characterization of the performance has been carried out. The enthalpy temperature curve, the specific heat and density have been measured for the tested paraffin. The performance of the tank has been analyzed in terms of the vertical stratification within the PCM, the effectiveness, the reacted fraction and the total heat transfer of the tank. The results indicate that up to 78% of the maximum capacity is reached within 4 h. The performance is mainly controlled by the supply temperature and the effect of the mass flow rate is almost negligible given that all the tests are in laminar flow.