skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Splayed mirror light pipes

Abstract

An expression is given for the transmission of the rectangular-section mirror light pipe. The expression is used to model throughputs for simulated solar conditions over a calender year. It is found that the splaying of a mirror light pipe results in a significant increase in throughputs particularly in winter months. (author)

Authors:
 [1]
  1. School of Physical Sciences, Dublin City University, Dublin 9 (Ireland)
Publication Date:
OSTI Identifier:
21285647
Resource Type:
Journal Article
Resource Relation:
Journal Name: Solar Energy; Journal Volume: 84; Journal Issue: 2; Other Information: Elsevier Ltd. All rights reserved
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; VISIBLE RADIATION; MIRRORS; LIGHT PIPES; SIMULATION; DAYLIGHTING; TRANSMISSION; RECTANGULAR CONFIGURATION; Mirror light pipes

Citation Formats

Swift, P.D. Splayed mirror light pipes. United States: N. p., 2010. Web. doi:10.1016/J.SOLENER.2009.10.008.
Swift, P.D. Splayed mirror light pipes. United States. doi:10.1016/J.SOLENER.2009.10.008.
Swift, P.D. 2010. "Splayed mirror light pipes". United States. doi:10.1016/J.SOLENER.2009.10.008.
@article{osti_21285647,
title = {Splayed mirror light pipes},
author = {Swift, P.D.},
abstractNote = {An expression is given for the transmission of the rectangular-section mirror light pipe. The expression is used to model throughputs for simulated solar conditions over a calender year. It is found that the splaying of a mirror light pipe results in a significant increase in throughputs particularly in winter months. (author)},
doi = {10.1016/J.SOLENER.2009.10.008},
journal = {Solar Energy},
number = 2,
volume = 84,
place = {United States},
year = 2010,
month = 2
}
  • This paper derives expressions for the transmission of mirror light pipes (MLP) with cross sections exhibiting congruent symmetry. These include rectangular, triangular, rhombic and hexagonal cross sections. For the case of rectangular MLP the transmissions calculated by this method are the same as the transmissions calculated by integrated ray trace methods. Measurements of the transmission of rectangular and triangular MLP were made and compared with calculated transmissions. It is shown that calculated transmissions are consistent with measured transmissions provided a reflectance that varies with incidence angle on the aperture of the MLP is used. A simple expression for this variationmore » was found from the experimental measurements. (author)« less
  • The efficiency of conical light pipes for collecting and transmitting light between plastic scintillators and photomultiplier tubes was investigated. (C.E.S.)
  • Pinning by splayed defects created by 3.9GeV {sup 197}Au{sup 29+} ions is studied using transport measurements of vortex motion perpendicular and parallel to the splay plane in untwinned crystals of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} . We compare the transport properties of the crystals and demonstrate (i) a new 1/H dependence of the vortex liquid pinning energy, (ii)a crossing of the irreversibility lines before and after irradiation, and (iii)a stronger temperature dependence of the critical current for vortex motion perpendicular to the splay plane than for motion parallel to the splay plane. {copyright} {ital 1998} {ital The American Physical Society}
  • Strong vortex pinning by fission-induced uniformly splayed columnar tracks in anisotropic mercury cuprates is demonstrated to result from (re)scaling of the pinning landscape by a large superconducting anisotropy. The effective {open_quotes}narrowing{close_quotes} of the splay distribution restores variable range vortex hopping (VRH) motion expected for nearly parallel pins. VRH emerges as a distinctive peak in the vortex creep rate ({approximately}12{percent} at low fields at T/T{sub c}{approximately}0.5 ) of the most anisotropic HgBa{sub 2}Ca {sub 2}Cu{sub 3}Othinsp{sub 8+{delta}} , a peak well described by a glassy dynamics with the characteristic exponent {mu}{approximately}1/3 . {copyright} {ital 1998} {ital The American Physical Society }