Showing papers in "Solar Energy in 2007"

TL;DR: With the incorporated HSWSO model, the sizing optimization of hybrid solar-wind power generation systems can be achieved technically and economically according to the system reliability requirements.

TL;DR: In this article, a European solar radiation database was developed using a solar radiation model and climatic data integrated within the Photovoltaic Geographic Information System (PVGIS) during the years 2001-2005, which consists of monthly and yearly averages of global irradiation and related climatic parameters, representing the period 1981-1990.

TL;DR: In this paper, the simultaneous impact of glazing area, shading device properties and shading control on building cooling and lighting demand was calculated using a coupled lighting and thermal simulation module, and the simulation results indicated that, if an integrated approach for automatic control of motorized shading is used in conjunction with controllable electric lighting systems, substantial reduction of energy demand for cooling in perimeter spaces, depending on climatic conditions and orientation.

TL;DR: In this article, the spectral properties and thermal performance of 10 prototype cool colored coatings, developed at the National and Kapodistrian University of Athens, using near-infrared reflective color pigments in comparison to color-matched, conventionally pigmented coatings are reported.

TL;DR: In this article, the effect of the street vertical profile, including asymmetrical canyon shapes, the use of galleries and further shading devices on the facades, arranged in various orientations are assessed.

TL;DR: In this paper, the authors investigated seven solar radiation models implemented in four building energy simulation codes: (1) isotropic sky, (2) Klucher, (3) Hay-Davies, (4) Reindl, (5) Muneer, (6) 1987 Perez and (7) 1990 Perez models.

TL;DR: In this paper, the effects of non-uniform solar irradiation distribution on energy output of different interconnected configurations in photovoltaic (PV) arrays are investigated, and a PV module model is developed to find which configuration is less susceptible to mismatch effects.

TL;DR: In this paper, the authors investigated the performance of two low cost heat extraction improvement modifications in the channel of a PV/T air system to achieve higher thermal output and PV cooling so as to keep the electrical efficiency at acceptable level.

TL;DR: In this paper, the authors investigated a method of enhancing the thermal conductivity of paraffin wax by embedding aluminum powder in it, which reduced the charging time by approximately 60%.

TL;DR: In this paper, experimental and numerical results from the investigation of cascaded latent heat storages with alkali nitrate salts like NaNO 3, KNO 3 and others more are reported.

TL;DR: In this article, the thermal environment of major cities in Greece (Athens, Thessaloniki, Patra, Volos and Heraklion) is examined using satellite images provided by the Landsat Enhanced Thematic Mapper (ETM+) sensor on board Landsat 7 satellite corresponding to the daytime and warm period when the surface urban heat island (SUHI) phenomenon is best observed.

TL;DR: In this article, a new type of hybrid photovoltaic/thermal (PV/T) collector with dual heat extraction operation, either with water or with air circulation is presented.

TL;DR: In this article, the phase change behavior of organic phase change materials (PCMs) in porous building materials was investigated using differential scanning calorimetry (DSC) and phase change composites.

TL;DR: A fully automated performance check has been developed to assure maximum energy yields and to optimize system maintenance for small grid-connected PV systems within the EU project PVSAT-2 and presents results of an 8-months test phase with 100 PV systems in three European countries.

TL;DR: Two fundamental conclusions are derived from this study: (1) the buck–boost DC/DC converter topology is the only one which allows the follow-up of the PV module maximum power point regardless of temperature, irradiance and connected load and (2) the connection of a buck– boost DC/ DC converter in a photovoltaic facility to the panel output could be a good practice to improve performance.

TL;DR: In this article, the carotenoids, crocetin (8,8′-diapocarotenedioic acid) and crocin (crocetin-di-gentiobioside), were used as sensitizers for dye-sensitized solar cells.

TL;DR: In this paper, the authors presented a mathematical model for the thermal performance of unglazed transpired solar collectors over a wide range of design and operating conditions, including porosity, airflow rate, solar radiation, and solar absorptivity/thermal emissivity.

TL;DR: In this article, three aspects of producing hydrogen via renewable electricity sources are analyzed to determine the potential for solar and wind hydrogen production pathways: a renewable hydrogen resource assessment, a cost analysis of hydrogen production via electrolysis, and the annual energy requirements for producing hydrogen for refueling.

TL;DR: A survey of the different automatic control techniques that have been applied to control the outlet temperature of solar plants with distributed collectors during the last 25 years is presented.

TL;DR: In this paper, a mixed mode type forced convection solar tunnel drier was used to dry hot red and green chillies under the tropical weather conditions of Bangladesh, and the drier consisted of transparent plastic covered flat-plate collector and a drying tunnel connected in series to supply hot air directly into the drying tunnel using two fans operated by a photovoltaic module.

TL;DR: In this paper, an attempt has been made to review on element geometries used as artificial roughness in solar air heaters in order to improve the heat transfer capability of solar air heater ducts.

TL;DR: In this paper, a radial distribution probabilistic load flow (PLF) program that has been developed by using Monte Carlo techniques has been used to solve the load flow problem in distribution networks with photovoltaic (PV) DG.

TL;DR: In this article, the available worldwide cooling technologies for agricultural greenhouses and discusses the representative applications of each technology are discussed, as per the collected information, the pros and cons of each technologies are also discussed.

TL;DR: A survey of the different advanced automatic control techniques that have been applied to control the outlet temperature of solar plants with distributed collectors during the last 25 years.

TL;DR: In this paper, a 16kWt liquid desiccant system was installed at the Energy Engineering Center at the Technion, in the Mediterranean city of Haifa, where LiCl-water is employed as the working fluid.

TL;DR: In this paper, the authors presented a study of the free cooling of a low-energy building using a latent-heat thermal energy storage (LHTES) device integrated into a mechanical ventilation system.

TL;DR: In this article, a localized spectral analysis based on wavelet bases rather than on periodic-ones has been applied to decompose the instantaneous clearness index signal into a set of orthonormal subsignals.

TL;DR: In this paper, a photovoltaics/thermal (PV/T) collector combined with a solar water heating collector and PV cells was used to limit the rise of the cell operating temperature.

TL;DR: In this article, the authors used an Artificial Neural Network (ANN) model to predict location specific hourly temperatures for London, taking into account radial distance from central London, hourly air temperature measured at the meteorological station and associated synoptic weather data.

TL;DR: Five simple algebraic methods addressed to predict this behaviour in Mediterranean climates have been empirically validated and show that crystalline silicon PV module outdoors performance may be described with sufficient accuracy.