Showing papers in "Solar Energy in 2005"

TL;DR: In this paper, the authors review the underlying science and describes the technological advances in the field of solar thermochemical production of hydrogen that uses concentrated solar radiation as the energy source of high-temperature process heat.

TL;DR: In this article, the use of an electrolyzer for peak shaving is discussed, as well as grid independent and grid assisted hydrogen generation, and integrated systems where electrolytically generated hydrogen is stored and then via fuel cell converted back to electricity when needed.

TL;DR: It has been proven that the transformation and standardization of the original series allow the use of ARMA models and these behave significantly better in the forecast than the persistence model, especially in the longer-term forecasts.

TL;DR: A PV-Diesel system optimised by HOGA is compared with a stand-alone PV-only system that has been dimensioned using a classical design method based on the available energy under worst-case conditions, where the demand and the solar irradiation are the same.

TL;DR: In this paper, the performance of a parabolic trough photovoltaic/thermal collector with a geometric concentration ratio of 37× is described and the impact of non-uniform illumination on the solar cells is investigated using purpose built equipment that moves a calibrated solar cell along the line of the receiver and measures short circuit current.

TL;DR: In this paper, the authors present a review of hydrogen energy technologies, namely technologies for hydrogen production, storage, distribution, and utilization, in parallel with possibilities to use hydrogen to enhance wind power competitiveness.

TL;DR: In this paper, a 3-junction InGaP/InGaAs/Ge concentrator solar cell with an efficiency of 37.4% (AM1.5G, 200-suns) has been fabricated.

TL;DR: In this paper, experiments were performed to find out how the thermal performance of a two-phase thermosyphon solar collector was affected by using different refrigerants, and the experimental results were compared to the results found in the literature and they showed good agreement.

TL;DR: In this paper, a review article deals with the motivation for using nanostructured materials in the field of solar energy conversion, and briefly some recent fundamental observations on supported nanoclusters and optical properties of embedded metallic nanClusters in a dielectric matrix.

TL;DR: In this article, an experimental and numerical investigation of transient forced convective heat transfer between the heat transfer fluid (HTF) with moderate Prandtl numbers and the tube wall, heat conduction through the wall and solid-liquid phase change of the phase change material (PCM), based on the enthalpy formulation, has been presented.

TL;DR: In this article, the authors present results in this field obtained both worldwide and by the authors of this paper, and the factors determining the efficiency of photoelectrolysis and possible ways to increase the photocatalytic activity of semiconductor photo-electrodes are analyzed.

TL;DR: Lack of sunshine duration measurements renders Angstrom’s approach inapplicable; hence the feasibility of applying the ANN models for the calculation of solar radiation in places where there is a lack of sunshineduration measurements is investigated.

TL;DR: In this paper, the thermal performance of a prototype solar cooker based on an evacuated tube solar collector with phase change material (PCM) storage unit is investigated, where solar energy is stored in the PCM storage unit during sunshine hours and is utilized for cooking in late evening/night time.

TL;DR: In this article, the thermal properties of the glazing as well as the optical and thermal properties were presented for the granular aerogels are compared to the values calculated using two different packed bed models.

TL;DR: In this article, the authors proposed the exploitation of solar energy for the dissociation of water and production of hydrogen via an integrated thermo-chemical reactor/receiver system using multi-channelled honeycomb ceramic supports coated with active redox reagent powders.

TL;DR: It is concluded that available assessment and prediction methods are of limited practical use in daylit situations and currently have no provision for integrated systems that combine daylighting and electric lighting.

TL;DR: In this paper, the authors analyzed the energy and exergy of a simple solar parabolic cooker from the perspective of exergy losses, and showed that the exergy loss on any radiating surface should be determined, if the surface absorbs many radiation fluxes of different temperatures.

TL;DR: In this paper, the suitability of high melting point phase change materials for use in new, large scale solar thermal electricity plants is investigated and their operating parameters modeled and analyzed, and the mathematical characteristics of charging and discharging these storage materials are discussed.

TL;DR: In this paper, the thermal performance of a phase change thermal storage unit is analyzed and discussed, based on both experimental results and a theoretical two dimensional mathematical model of the phase change material (PCM) employed to analyse the transient thermal behaviour of the storage unit during the charge and discharge periods.

TL;DR: In this article, a helical tape is inserted in the tube with a view to generating swirl flow that helps to increase the heat transfer rate of the tube, and the experimental data obtained are compared with those obtained from plain tubes of published data.

TL;DR: Results obtained indicate that the proposed model can successfully be used for the estimation of the daily solar radiation data for any locations in Algeria by using as input the altitude, the longitude, and the latitude and can be generalized for any location in the world.

TL;DR: In this article, the authors investigated the possibility of constructing a two-stage solar-to-electric energy converter with high-temperature second stage, having the overall conversion efficiency of 30-40%.

TL;DR: Wang et al. as mentioned in this paper investigated the effect of envelope color and thermal mass on indoor temperatures and showed that the use of lighter surface colour and Thermal mass can dramatically reduce maximum indoor temperatures.

TL;DR: In this article, the authors evaluated the characteristics of water-in-glass evacuated tube solar water heaters including assessment of the circulation rate through single ended tubes and developed a numerical model of the heat transfer and fluid flow inside a single-ended evacuated tube.

TL;DR: Granular phase changing composites for thermal energy storage were made of granular porous materials and organic phase changing materials by means of vacuum impregnation method as discussed by the authors, which is effective in loading porous materials with phase changing material and its setup is simple, cheap and easy of scale-up.

TL;DR: In this paper, a solar chimney system for power production at high latitudes has been designed and its performance has been evaluated and a mathematical model and a code on MATLAB platform have been developed based on monthly average meteorological data and thermodynamic cycle.

TL;DR: In this article, a combined model that takes into account moisture sources and sinks inside a room, input from the envelope due to capillary action, diffusion and vapour absorption and desorption as a response to the exterior and interior climate conditions as well as the well-known thermal parameters is described.

TL;DR: A comprehensive modelling of a compact double-skin facade equipped with a venetian blind and forced ventilation is proposed here, analysing the impact of three parameters on the airflow development: slat tilt angle, blind position and air outlet position.

TL;DR: The simplified building simulation tool gives reliable results compared to detailed tools and needs only few input data to perform a simulation and is therefore useful for preliminary design tasks in the early design stages where rough estimates of the building design are given and rough Estimates of energy use and thermal indoor environment are needed for decision support.

TL;DR: In this article, double glazing combined with phase change materials (PCM) result in daylighting elements with promising properties, which can achieve light transmittances in the range of 0.4 to 0.6 W −m −2 ǫ K −1.