Laboratoire Optimisation Of La Conception Et Ingenierie Of Lenvironnement

Le Bourget-du-Lac, France

Laboratoire Optimisation Of La Conception Et Ingenierie Of Lenvironnement

Le Bourget-du-Lac, France
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Bai Y.,Laboratoire Optimisation Of La Conception Et Ingenierie Of Lenvironnement | Fraisse G.,Laboratoire Optimisation Of La Conception Et Ingenierie Of Lenvironnement | Wurtz F.,CNRS Grenoble Electrical Engineering Lab | Foggia A.,CNRS Grenoble Electrical Engineering Lab | And 2 more authors.
Solar Energy | Year: 2011

The solar domestic hot water (SDHW) system is the most highly developed system for use of solar energy. The developments for the thermal regulation of buildings should reinforce this trend given the significant reduction of heating needs. Currently, the design of these SDHW installations is well controlled and the system performance is reasonably good. The annual average solar fraction is consistent with expected level (between 60% and 70%) according to a report of CSTB by evaluating 120 SDHW installations (Buscarlet and Caccavelli, 2006). However, the control mode of conventional SDHWs induces additional costs related to the consumption of auxiliaries and other risks of dysfunction of the circulation pump due to the temperature probes and controller setup which induces low annual productivity of solar collector (200 instead of 400kWh/m2 expected). From this point of view, the photovoltaic pumped system seems suitable since it eliminates the controller and temperature sensors. This paper focuses on an experimental and numerical study of the behavior of a PV-SDHW system, focusing on the start-up phase optimized through various electronic devices. A detailed model of a circulation pump was developed by considering a direct current (DC) circulation pump coupled with various electronic devices (linear current booster and maximum power point tracker). The developed models were then validated experimentally, to reveal the influence of the threshold solar radiation on the circulation pump start-up and the pump flow rate as a function of the solar radiation, and its effects on the annual energy performance of PV-SDHW systems. © 2011 Elsevier Ltd.


Fraisse G.,Laboratoire Optimisation Of La Conception Et Ingenierie Of Lenvironnement | Lazard M.,Institute Superieur Dingenierie Of La Conception | Goupil C.,National Engineering School of Caen | Serrat J.Y.,Laboratoire Optimisation Of La Conception Et Ingenierie Of Lenvironnement
International Journal of Heat and Mass Transfer | Year: 2010

This study presents a new thermoelectric element modelling based on an electrical analogy. The balance equation for a node of the analogical model is equivalent to the local energetic balance of a thermoelectric element. A particular attention is paid on taking into account all the effects Peltier, Joule and Thomson. This approach leads to a noticeable modification of the performances compared to previous estimations obtained by classical approaches where the Thomson contribution is neglected and no thermo-dependence of the thermophysical properties is assumed. This analogical modelling is appropriate for description of steady states but also for transient state and for non-conventional geometries. The general behaviour of a thermoelectric leg under cooling mode is studied and the different possibilities of improving the performances are investigated. The analysis of the thermodynamical behaviour is also presented by separating the contribution of each effect. © 2010 Elsevier Ltd. All rights reserved.

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