00574 Optimization of orientation for higher yield of solar still for a given location

00574 Optimization of orientation for higher yield of solar still for a given location

07 96100566 systems Life cycle analysis of silicon-based photovoltalc Huber, W. and Kolb, G. Solar Energy, Mar. 1995, 54, (3), 153-163. The analy...

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07 96100566 systems

Life cycle analysis of silicon-based photovoltalc

Huber, W. and Kolb, G.

Solar Energy,

Mar. 1995, 54, (3), 153-163.

The analysis focuses on a comparative evaluation of emissions from conventional private passenger vehicles versus the environmental burdens of electric passenger vehicles. The batteries of electric passenger vehicles are loaded during daily working hours partly via silicon-based PV panels covering the vehicle parking areas (solar service stations), and partly via the public electric grid. The data base refers to Western Germany, and the tentative time period is around 2005. The analysis is based on detailed data collections for the fabrication of technical silicon, multi- and monocrystalline standard, MIS-I cells, and amorphous cells.

96100567 Mathematical model for predicting the magnitudes of total, diffuse, and direct-beam Insolation Grindley, P. C. er al., Applied Energy, 1995, 52, (2), 89-110.

Alternative energy sources (solar energy)

96100673 On shadowband correction methods for diffuse It-radiance measurements Batlles, F. J. et al., Solar Energy, Feb. 1995, 54, (2), 105-114. Diffuse irradiance G,, is an important variable in solar resource. assessment. The diffuse irradiance can be worked out from global, G, and direct, G,, irradiance measurements. but this method involves the use of relativelv e$ensive tracking mechanisms. Alternatively, a widely accepted tech: nique uses a pyranometer with a shadowband. Because the shadowband screens the sensor from part of the diffuse radiation coming in from the sky, a correction must be made to the measurements. However, because of the anistropy of diffuse radiation it is difficult to compute an exact theoretical correction. In this study the authors use two data-sets registered in two locations in Spain.

96100574 Optlmlzatlon of orientation for higher yield of solar still for a given location Sin h, A. K. et al., Energy Convers. Mgmt., Mar. 1995, 36, (3), 175-187.

Measured values for the solar irradiance recorded at 1 min time intervals at a rural location near Cambridge, UK, were used to examine the relationship between the fraction of the solar radiation received on a horizontal surface and the diffuse fraction. The measurements corroborate the predictions from the mathematical model, whose validity is thus supported.

In ti?is technical note, an optimization of the orientation for higher yield of a solar still has been carried out in terms of the glass cover inclination. The effect of water depth on the hourly instantaneous cumulative and overall thermal efficiency and internal heat transfer coefficient has also been studied. Numerical computations have been made for Delhi climatic conditions. It is inferred that east-west orientation of a double slope solar still gives the maximum yield for a glass cover inclination at around 55”.

Measuring spectral diffuse solar lrradiance with non-cosine flat-plate diffusers

96100575

96100566

De La Casiniere,

A. er al., Solar Energy, Mar. 1995, 54, (3), 173-182.

In spectral diffuse solar irradiance measurements, when diffusing devices used are neither perfectly Lambertian nor have an ideal cosine response, significant errors may spoil the collected data. An optical method permits the determination of a spectral correction factor (SCF) which fully compensates for the diffusers’ imperfection when the sky radiance is isotropic. A study of the errors introduced when using such a isotropic SCF in anisotropic radiance conditions is presented for two common flat-plate diffusers fitted with a shadow-ring or a tracking disk.

Microprocessor-based cathodic protection system using photovoltalc energy

Organic-inorganic mixtures for solar energy stor-

age systems Tayeb, A. M. Energy Convers. Mgmt., Oct. 1995, 36, (lo), 969-974. Mixtures of organic-inorganic substances are studied for their performance as energy storage media. Use is made of the fact that organic substances give higher amounts of energy but within a wide range of temperature on the one side and the fact that inorganic substances give lower amounts of energy at constant temerature on the other side. Mixtures of both types of substances, in different ratios, are investigated for the object of determining that optimum composition which stores a higher amount of energy and, meanwhile, releases it at a constant temperature or within a narrow range of temperature. The mixtures used are composed of Glauber’s salt and stearic acid in different proportions.

96100569

El Ghitani, H. and Shousha,

Applied Energy, 1995, 52, (2), 299-305.

Cathodic protection (CP) is a means of rendering a metal immune from corrosive attack by utilizing an external direct current to op ose the discharge of corrosion current from the anodic areas of the meta P. IIC structure. The variation of the surrounding medium’s resistivity due to changes in climatic conditions makes it difficult to stop the corrosion completely. So, the development of an automaic CP system is necessary to overcome this difficulty. The work aims to automate the conventional manually used impressed current method for buried steel pipelines. The CP pipeline-tosoil potential difference will be adjusted automatically and continuously using an electronic control system.

96100570

Modeling the dynamics of the mixed layer in solar

ponds Sreenivas,

K. R. er al., Solar Energy, Mar. 1995, 54, (3), 193-202.

A new model is proposed to explain the Nielsen’s equilibrium condition. This model takes into account the effects of both turbulent entrainment and diffusion on the growth/erosion of the gradient zone. The existing turbulent entrainment model is modified to make it applicable near the equilibrium condition. The new model predictions indicate the dependence of the equilibrium condition on the mixed layer depth, apart from he salinity and temperature gradients in the gradient zone.

96100576 Outlook for high efficiency solar cells to be used with and without concentration %;r;;; V. K. et al., Energy Convers. Mgmr., Apr. 1995, 36, (4), The paper is in continuation of an earlier research paper on stand alone photovoltaic systems designed to provide energy to villages and isolated communities, especially in rural areas of developing countries. This paper on photovoltaic technology has been devoted to the review of literature concerning the development of solar cells with high conversion efficiency to be used both with and without concentration.

The oven receiver: An approach toward the revival of concentrating solar cookers

96100577

Habeebullah, M. B. et al., Solar Energy, Apr. 1995, 54, (4), 227-237. Concentrating type solar cookers are expected to demonstrate high performance because of the large collection area employed. However, the net amount of heat used is still low. This is greatly attributed to the large amount of heat losses from the bare food pots used. Introducing the oven type concept as an alternative approach for collecting the concentrated solar energy would drastically boost the overall cooker efficiency. In this work, the transient heat balance equations were developed for predicting the thermal behaviour of an oven type conentrating solar cooker. 96100576

Parametric analysis of a suspended flat plate solar

air heater

96100571 A new method to determlne Angstrom’s turbidity coefflclent: Its application for Valencla Pinazo, J. M. et al., Solar Energy, Apr. 1995, 54, (4), 219-226. Traditionally the Angstrom turbidity coefficient has been derived from either spectral direct solar radiation measurements or broadband direct solar radiation and precipitable water measurements. The new method for calculating the Angstrom turbidity coefficient presented in this paper is based on the ratio of direct solar radiation to global solar radiaton on a horizontal surface and on the ‘C’ model of Iqbal. For this method, it is not necessary to know the precipitable water and the ozone content of the atmosphere.

New resource for learning about renewables MPS, Modern Power Sysrems, Oct. 1995, 15, (lo), 27, 29.

96100572

With increasing pressures on conventional energy sources and the newfound maturity of some renewables, the future would seem to be at least partly solar. There is a need, therfore, for resources to educate people about both inside and outside utilities. these new generating possibilities, Describes a new resource pack which seems to fill this gap.

Yadav, Y. P. et al., Energy Convers. Mgmr., May 1995, 36, (S), 325-335. Parametric analysis of a suspended flat plate solar air heater is presented following a transient approach. An explicit expression for air temperature has been derived as a function of time and the space coordinate. Apart from this, explicit expressions are also presented for the glass cover temperature, absorber plate temperature, useful energy and efficiency of the proposed system.

Performance analysis of a high temperature solar distillation system

96100579

Yadav, Y. P. and Prasad, A. S. Energy Convers. Mgmr., May 1995, 36, (5), 365-374. A solar still integrated with a parallel flat plate solar collector is employed to perform distillation at a relatively high temperature and is, therefore, referred to as a high temperature solar distillation system. The performance analysis of this system is reported, and closed form solutions are obtained for the temperatures of various components of the system, the distillate outout and the efficiencv as a function of the still and collector oarameters apart fom the meteorological and heat and mass transfer parameters. For appreciation of the analytical results, numerical calculatrons have been carried out incorporating the meteorological parameters of a typical day in Delhi.

Fuel and Energy Abstracts January 1996 36