New solar tracker

Poulek, V.; Libra, Martin

doi:10.1016/s0927-0248(97)00276-6

Cited by 68 publications

(25 citation statements)

References 5 publications

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“…The main task of the technology used for both transformations is to do it with as high as possible efficiency and low costs. Solar energy in that way is widely used in many countries all over the globe, particularly in Southern countries and large amount of international experience is collected [1]. Solar panels and collectors produce more energy, if direct solar radiation strikes the working surface perpendicularly during the whole operation time [2].…”

Section: Introductionmentioning

confidence: 99%

Solar tracking stand for solar panels and collectors

Putans

Ziemelis

Pelece

et al. 2018

Engineering for Rural Development

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Abstract. The conversation of solar energy into electricity using photovoltaic panels and into heat energy using solar collectors is the challenge of the time. Presently widely used fossil energy is unfriendly to the earth environment and its amount is limited. Both solar panels and solar collectors produce more energy, if direct solar radiation strikes its working surface perpendicularly during all the operation time. For that special device -the sun tracking stands or trackers, automatically keeping their working surface perpendicular to the sunbeams, are used. Different constructions of solar trackers and actuators are known: trackers based on the clockwork principle, based on the principle of freon evaporation and condensation, based on the principle of spring made of shape-memory alloys and others. The trackers act on a control unit and actuator, changing the position of the panels or collectors in azimuth, or azimuth and zenith plane. Different constructions of the actuators are in operation. Driving mechanisms with one electric motor (turning only in one plane) or with two electric motors (turning in two planes) are widely used. In the Ulbroka Research Centre a solar tracking stand of a new construction has been developed. There only one electric motor with a gearbox and a crank mechanism simultaneously is turning solar panels in two planes (Latvia patent LV 15245 A, 2017). The device has been made, experimentally investigated in field conditions on the roof of a house and positive results have been obtained. The amount of electric energy produced by two solar panels placed on the developed stand during the summer time of 2017 has been compared with the gain of electricity produced by in the same conditions working stationary fixed panels of the same type. Tracking the sun panels had produced around 1.48 times more electric energy than the fix ones, but in September 1.3 times more.Keywords: photovoltaic, panels, electricity, trackers. IntroductionThere are many possibilities of the use of solar energy. One of them is the use it for production of heat and electricity. The conversion of solar energy into electricity using photovoltaic panels and into heat energy using solar collectors can help decrease the consumption of fossil energy, which is widely used up to date but is unfriendly to the earth environment. The technology for production of heat energy from sunlight has been known and used long time ago. The transformation of solar energy into electricity is another possibility to use it for practical needs. The main task of the technology used for both transformations is to do it with as high as possible efficiency and low costs. Solar energy in that way is widely used in many countries all over the globe, particularly in Southern countries and large amount of international experience is collected [1]. Solar panels and collectors produce more energy, if direct solar radiation strikes the working surface perpendicularly during the whole operation time [2]. On cloudy days, if there is no direct radiation, ...

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Section: Introductionmentioning

confidence: 99%

Solar tracking stand for solar panels and collectors

Putans

Ziemelis

Pelece

et al. 2018

Engineering for Rural Development

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“…The passive system uses passive components or physical/mechanical changes of the materials to change the structure of the tracking mechanism for sunlight tracking. However, the active control mechanism needs motor, control IC, tracking program, and sensing elements for tracking the position of the sun [15][16][17][18][19]. Chin et al [20] designed an active single axis solar tracker with two light-dependent resistor (LDR) sensors that are located on the surface of the photovoltaic (PV) panel.…”

Section: Introductionmentioning

confidence: 99%

Biaxial-Type Concentrated Solar Tracking System with a Fresnel Lens for Solar-Thermal Applications

2016

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Abstract:In this paper, an electromechanical, biaxial-type concentrated solar tracking system was designed for solar-thermal applications. In our tracking system, the sunlight was concentrated by the microstructure of Fresnel lens to the heating head of the Stirling engine and two solar cells were installed to provide the power for tracking system operation. In order to obtain the maximum sun power, the tracking system traces the sun with the altitude-azimuth biaxial tracing method and accurately maintains the sun's radiation perpendicular to the plane of the heating head. The results indicated that the position of heating head is an important factor for power collection. If the sunlight can be concentrated to completely cover the heating head with small heat loss, we can obtain the maximum temperature of the heating head of the Stirling engine. Therefore, the temperature of heating head can be higher than 1000˝C in our experiment on a sunny day. Moreover, the results also revealed that the temperature decrease of the heating head is less than the power decrease of solar irradiation because of the latent heat of copper and the small heat loss from the heating head.

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“…The sunlight tailing system, [4,5] by which the position and direction of the lens are changed, has been conventionally used to condense the solar heat, but this system requires mechanically complicated actuators. Traditionally, the condensing methods using a trough [6,7] and a tower have been employed, equipping with a large-scale mechanical movements.…”

Section: Introductionmentioning

confidence: 99%

Using a Water Lens for Light Concentration in Thermoelectric Generation

Ito

Sui

Hakozaki

et al. 2014

Journal of Elec Materi

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A water lens is employed to concentrate sunlight on the surface of a thermoelectric (TE) module in order to heat it. This water lens can change its shape flexibly and adjustable to solar altitudes. The lens shape and light path were simulated for the cases when the light is incident at an angle to the water surface, parallel to the central axis of the half-cylindrical water lens, and when the light is focused on a plate. A condensing ratio larger than 70 is achieved when the incident light is closer to 2 the normal of the water surface and if the optimal lens shape is maintained.

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New solar tracker

Cited by 68 publications

References 5 publications

Solar tracking stand for solar panels and collectors

Solar tracking stand for solar panels and collectors

Biaxial-Type Concentrated Solar Tracking System with a Fresnel Lens for Solar-Thermal Applications

Using a Water Lens for Light Concentration in Thermoelectric Generation

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