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A solar receiver for use in a solar energy concentrator

A technology of solar energy and receiver, applied in the field of high temperature solar energy collectors

Inactive Publication Date: 2014-03-19
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This limits the temperature to which the gas and other materials within the device can be heated

Method used

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  • A solar receiver for use in a solar energy concentrator
  • A solar receiver for use in a solar energy concentrator
  • A solar receiver for use in a solar energy concentrator

Examples

Experimental program
Comparison scheme
Effect test

example

[0070] The following examples illustrate the absorption properties of vitreous quartz with high OH content.

example 1

[0072] Two 1 mm thick samples of quartz were obtained with known OH contents of 0.2 and 141 ppm respectively (the former being Philips Quartz product PH300XD and the latter being unbaked Philips Quartz product PH409, both of which are V-type vitreous quartz) . The light transmittance (measured as % of light transmitted) through each sample was measured using a Fourier transform infrared spectrometer over the infrared wavelength range. The results are shown in figure 2 . It can be seen that the OH groups in the quartz absorb in the region of 2680–2800 nm and have an absorption maximum at 2720 nm.

example 2

[0074] Additional values ​​for light transmission were calculated for quartz samples with OH contents of 100, 200, 400 and 800 ppm. image 3 Calculated transmission spectra of quartz with 100, 200, 400 and 800 ppm OH groups are shown.

[0075] image 3 The transmission spectrum of is calculated using equations (1) and (2):

[0076] T=(100-R)*e -A (1)

[0077] in

[0078] R = reflection loss (at each of the two quartz-air interfaces, 3.5%)

[0079] A = absorbance calculated using the Lambert-Beer law (2):

[0080] A=α*n*l (2)

[0081] in

[0082] α = Absorption rate of OH group (mm -1 ppmOH -1 ), calculated according to the experimental results in Example 1 and shown in Figure 4

[0083] n=OH group content (by weight, ppm)

[0084] l=quartz thickness (mm)

[0085] A blackbody at 800°C will emit light across the entire infrared spectrum and about 3% of the emitted light will be in the 2680-2800nm ​​region. Vitreous q...

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Abstract

This application relates to solar receivers and solar energy concentrators, and windows for use therein. The solar receiver comprises a housing (2) and a window (3) disposed in or on a wall (4) of the housing (2), wherein the window (3) comprises vitreous silica having an OH content of 30 ppm or more by weight. In a prior art solar receiver having a high purity vitreous silica window, the window generally requires cooling if the receiver is operated at temperatures above 800° C., which limits the receiver's efficiency. The solar receiver of this application addresses the problem of the limited efficiency of the prior art receivers by using a window comprising vitreous silica having a relatively high OH content of 30 ppm or more by weight.

Description

technical field [0001] The present invention relates to high temperature solar concentrators which can be used to heat materials optionally to temperatures in excess of 800°C. In particular the invention relates to windows for use in solar energy concentrators and solar receivers for use in solar energy concentrators. Background technique [0002] Solar energy is used on a modest scale to generate hot water for domestic use or to generate steam in large parabolic trough installations. In these applications, sunlight falls directly on a dark substrate or is focused via a parabolic trough mirror onto an absorber tube to heat water or oil contained within the tube. Parabolic trough collectors can heat steam, but typically to temperatures less than about 500°C. [0003] High temperature solar concentrators for heating materials to temperatures above about 800°C are known. Examples of such solar concentrators are disclosed in the paper by Räger et al. in Journal of Solar Energ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C3/06F24S20/20F24S23/00
CPCY02E10/41F24J2/07F24J2/505F24S20/20F24S80/52Y02E10/40
Inventor T·范德格拉夫
Owner KONINK PHILIPS ELECTRONICS NV