Experimental analysis of solar thermal storage in a water tank with open side inlets |
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Authors: | E Palacios DM AdmiraalJD Marcos M Izquierdo |
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Affiliation: | a Escuela Universitaria de Ingeniería Técnica Industrial, UPM, Ronda de Valencia 3, 28012 Madrid, Spain b Department of Civil Engineering, University of Nebraska-Lincoln, W181 Nebraska Hall, Ne 68588-0531, Lincoln, NE, USA c Escuela Técnica Superior de Ingeniería Industrial, UNED, Juan del Rosal 12, 28040 Madrid, Spain d Instituto de Ciencias de la Construcción Eduardo Torroja, CSIC, Serrano Galvache 4, 28033 Madrid, Spain e Universidad Carlos III de Madrid, Avenida de la Universidad, 30, 28922 Leganés, Madrid, Spain |
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Abstract: | This paper investigates thermal mixing caused by the inflow from one or two round, horizontal, buoyant jets in a water storage tank, which is part of a thermal solar installation. A set of experiments was carried out in a rectangular tank with a capacity of 0.3 m3, with one or two constant temperature inflows. As a result, two correlations based on temperature measurements have been developed. One of the correlations predicts the size of a zone of homogenous temperature, referred to herein as the mixing zone, which develops when a single hot inflow impinges on the opposite wall of the tank. The other identifies the degree of mixing resulting from the interaction between a hot inflow and a cold inflow located below the hot one. The correlations are combined with energy balances to predict the amount of hot water available in a tank with open side inlets and the corresponding temperatures of the outflows. Outdoor measurements were also performed in a solar installation, in which a commercial water storage tank with a 1.5 m3 capacity, heated by a solar collector array with a useful surface area of 42.2 m2, drives a LiBr-H2O absorption chiller. Comparison of the predicted and measured outflow temperatures under a variety of weather conditions shows a maximum difference of 3 °C. |
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Keywords: | Stratified Thermal storage Jets Solar energy Load management |
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