Design of an innovative and simplified polar heliostat for integration in buildings and urban environments

Torres-Roldán, M.; Luque, Rafael; Varo-Martínez, Marta

doi:10.1016/j.solener.2015.06.041

Cited by 16 publications

(8 citation statements)

References 25 publications

(24 reference statements)

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“…1(a) shows the solar vector on an equatorial reference system with the origin in the center of the Earth, the Ox 0 y 0 plane coinciding with the equator plane. Therefore, the Oz 0 axis is parallel to the Earth's rotational axis, and the Oz 0 y 0 plane coincides with the plane of the local meridian (Torres-Roldán et al, 2015). In this coordinate system the hour angle, given by the product of the rotation speed X ¼ 2p=24 rad=hÞ by the time elapsed after the solar midday, and declination d can be represented as the angle u.…”

Section: Astronomical Bases Of Solar Trackingmentioning

confidence: 99%

Mathematical study of the movement of solar tracking systems based on rational models

et al. 2017

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Section: Astronomical Bases Of Solar Trackingmentioning

confidence: 99%

Mathematical study of the movement of solar tracking systems based on rational models

et al. 2017

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“…The algorithm for the calculation of the magnitudes associated to both movements has been described in detail a previous paper [9].…”

Section: Mechanical Principles Of the Proposed Designmentioning

confidence: 99%

Prototype of a simplified polar heliostat suitable for integration in buildings

Roldán¹,

Varo-Martínez²,

López-Luque³

2016

REPQJ

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The increasing improvement of energy sustainability entails a raise in the use of heliostats in small applications. These devices aim to use direct radiation as a source of natural lighting, and they are also used as components for concentration systems in thermal and photovoltaic applications. Most technological developments published about heliostats up to now refer to concentration tower thermosolar power plants. Furthermore, they are orientated towards heliostats of big dimensions with large distances between the reflector and the focus. It is different, however, for urban applications, where smaller heliostats and lower distances travelled by reflected rays are proposed, and, consequently, greater errors in solar tracking are allowed. This paper describes a new simple heliostatic system suitable for small applications. The main feature of this system is the possibility of controlling several heliostats with a unique engine. It must be highlighted that the system proposed uses a simple logic and has an easy electronic controller implementation.

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“…It is therefore necessary to deepen the understanding of the behaviour of heliostats and their possible application as illuminators in buildings. In this context, this paper presents an analysis of the performance of a heliostatic illuminator (based on the single-axis polar heliostat prototype developed by Torres-Roldan et al [2,13]) to improve illumination in a classroom at the Campus of Rabanales of the University of Cordoba (Spain).…”

Section: Introductionmentioning

confidence: 99%

Daylighting system based on single-axis polar heliostat

Ahumada¹,

Torres-Roldán²,

Osuna-Mérida³

et al. 2022

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The fight against climate change makes it necessary, among other measures, to improve the energy efficiency of buildings. One way of doing this is to improve the levels of natural lighting inside buildings. In this sense, this paper analyses the possible use of heliostats as natural illuminators in an educational space. For this purpose, a classroom in the Leonardo da Vinci building of the Rabanales Campus of the University of Cordoba (Spain) and an illuminator system based on a single-axis polar heliostat have been reproduced at a scale of 1:15. These devices have been exposed to the same solar irradiance conditions and the illuminance levels registered inside both devices have been compared. It was found that there is an increase in daylighting levels in the recreated classroom ranging from 70.40% to 242.58% compared to the situation without heliostat illuminators. Therefore, it can be concluded that heliostats can play a fundamental role to improve the efficiency of buildings and, therefore, in the fight against climate change.

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Design of an innovative and simplified polar heliostat for integration in buildings and urban environments

Cited by 16 publications

References 25 publications

Mathematical study of the movement of solar tracking systems based on rational models

Mathematical study of the movement of solar tracking systems based on rational models

Prototype of a simplified polar heliostat suitable for integration in buildings

Daylighting system based on single-axis polar heliostat

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