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Saturday, February 1, 2020 | History

2 edition of Non-imaging concentrators for wide angle collection of solar energy ... found in the catalog.

Non-imaging concentrators for wide angle collection of solar energy ...

Roland Winston

Non-imaging concentrators for wide angle collection of solar energy ...

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  • 40 Currently reading

Published by Energy Research and Development Administration, Division of Solar Energy, for sale by the National Technical Information Service in [Washington], Springfield, Va .
Written in English

  • Solar collectors.

  • Edition Notes

    Statement... Roland Winston ... J.J. O"Gallagher.?
    ContributionsO"Gallagher, J J , joint author., United States. Energy Research and Development Administration. Division of Solar Energy
    The Physical Object
    Paginationv. :
    ID Numbers
    Open LibraryOL22440594M

    The tower is planned to be 1. The shade regions receiving the output of the light harvester gave a reading of as measured on the ground. Figure 4 shows a picture of such a system with the secondary reflector and absorber tube glowing brightly at the top of the frame, and the planar mirrors appearing at the bottom of the frame. Collector and Thermal Storage The collector is basically a large green house.

    De Pascale et al. Their system is expected to be much cheaper and easier to build and maintain than conventional propeller turbines. Instead of light being confined by two reflective surfaces, it is confined by a reflective surface and a caustic of the edge rays. It is termed a "prototype" trough because, although it is not a commercially available product, it does contain features of many of the commercial troughs currently under development. The slave mirrors of row 1, 2, 4 and 5 are attached to the heliostat frame in such a way that they can turn about their own pivot point P1, P2, P4 and P5, respectively.

    In these cases the invented devices will cross the construction roof. This decreases the effectiveness of the method, but allows for simpler optics. As early asit is projected that This angle covers the declination of the sun from summer to winter solstices 2 X Two systems may be identified: i Dish-Stirling systems: a Stirling motor coupled to a generator is placed at the receiver end.

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Non-imaging concentrators for wide angle collection of solar energy ... book

Similarly, improving irradiation of plant tissue by pruning may not have the overall benefits expected because the amount of photosynthetically active plant tissue has been decreased.

Concentrators of the type shown in Figure 3. Ackermann and British physicist Sir Charles Vernon Boys ,[ citation needed ] developed an improved system using mirrors to reflect solar energy upon collector boxes, increasing heating capacity to the extent that water could now be used instead of ether.

It can therefore be concluded that the maximum concentration ratio for two-axis tracking collectors is much higher. A Dish — Stirling system, Schiel, W.

Design - Many of the design tradeoffs discussed above for the prototype trough were also examined in the design of the Shenandoah dish. The normal chosen for point T0 must be perpendicular to curve a.

Moreover, they possess several advantages which make them ideally suited for desert environments. Karpinski, S. The spacing between individual plants significantly controls the amount of effective light reaching different parts of the plant.

The diffused light provides light to drive photosynthesis as well as light to influence multiple photomorphogenetic systems. The mean roof height was 1.

They are also cheaper to manufacture than conventional glass mirror heliostats but are less resistant to wind and sand erosion and more difficult to clean and maintain.

In the case of our heliostat, it is convenient to use square mirror. The lines 54 represent the acceptance limits of the CPC, and these limits define the acceptance angle Because, the three dimensional structure of fruit creates self-shading.

Parabolic trough

Baranov 3; 5 obtained Soviet patents on several CPC configurations. It basically consists of rows of cylindrical parabolic mirrors which collect solar radiation and focus it on a line, along which lies an absorber tube.

Reading assignment Book chapter: Duffie, J. Whereas the light harvester collects solar radiation from a relatively large area the surface area of the harvester and concentrates it into the smaller area of the transmitter e. Figure 6. Moreover since air temperature rise is the main factor affecting plant performance, and not ground temperature, the effect of cooler ground temperatures during night time on plant performance is partially offset by cooler external air temperatures.

Since these may be arbitrary rays crossing c, it may be concluded that the optical path length between w1 and w2 is the same for all rays perpendicular to incoming wavefront w1 and outgoing wavefront w2.

Collector and Thermal Storage The collector is basically a large green house. Now ray r2 coming from w3 is refracted at B2 and, with the optical path length S 23, a new point T2 and its normal is obtained on the top surface.

CPCs are the most common seen nonimaging optics. Although not obvious on this curve, the short circuit current increases slightly with temperature.

Not only does it follow the most efficient thermodynamic cycle, but it also employs an external heat source which allows it to operate with a hybrid heat receiver. These collectors are more useful as linear or trough-type concentrators.

Instead of light being confined by two reflective surfaces, it is confined by a reflective surface and a caustic of the edge rays. In this example shown in the figure, the optic has a left-right symmetry and, therefore, points B2 T2 B4 T4 B6 can also be obtained by symmetry about the vertical axis of the lens.

Nonimaging optics

Here the light source is the sun moving in the sky. It is known that shading has particularly negative effects on fruit coloration. In this example the optic is a lens an RR optic with two refractive surfaces, so its refractive index must also be specified.

Floating solar chimneys are lighter than air structures that can be as tall as 1.This, together with economy of scale when solar energy technologies have spread widely, should pave the way for solar energy plants to gradually replace conventional and nuclear plants whose technologies have already matured so that further improvements are limited, and whose total construction and running costs are by: 2.

Journal of Photonics for Energy Neurophotonics Optical Engineering Ebooks Advanced Search > Home > Proceedings > Volume Optics & Energy Concepts, Paul-Gerhardt-Allee 42, D Munich, Germany Optical In-Situ Assessment of a Nonimaging Secondary Concentrator in a Solar Tower A method for remote optical measurement of the geometry of nonimaging concentrators is presented.

A concentrator installed in a solar tower was measured by observation of. The sunlight is concentrated on the tube and the fluid heated to a high temperature by the energy of the sunlight.

The hot fluid can be piped to a heat engine, which uses the heat energy to drive machinery, or to generate electricity. This solar energy collector is the most common and.

Get this from a library! Non-imaging concentrators for wide angle collection of solar energy. [Roland Winston; J J O'Gallagher; United States. Energy Research and. The thermodynamic limits of light concentrators G. Smestad * Hewlett Packard Company, Optoelectronic Division, W.

Trimble Road, San Jose, CAregards to use in solar energy and solar concentrators. or non-imaging con- centrator [1,]. The CPC is .