Abstract
A Linear Fresnel Reflector (LFR) is a recent technology with good potential in small-scale solar power applications. It is composed of many long rows of mirrors that focus the sunlight onto a fixed elevated tubular receiver. Mirror segments are aligned horizontally and track the sun such that the receiver does not need to be moved. The efficiency with which the LFR can convert solar to thermal energy depends on the accuracy of the sun tracking system. To maximize the degree of sunlight capture, precise solar tracking is needed so that incident solar rays can be adequately focused to the focal point given by the location of the tubular receiver. The tilt angles of each row are relevant for the tracking controller to achieve correct positioning. Encoders are generally employed in closed-loop tracking systems as feedback signals used to inform the controller with the actual position of collector mirrors. Recently, inclinometers have begun to replace encoders as the most viable and cost-effective sensor technology solution; they offer simpler and more precise feedback, as they measure the angle of tilt with respect to gravity and provide the ability to adjust the system to the optimal angle for maximum output. This paper presents the research results on the development of remote measurements for the precise control of an LFR tracking system, by using distributed angle measurements. The applied methodology enables precision measurement LFR inclination angles through the fusion of data from multiple accelerometers, supported by low-cost wireless transceivers in a wireless sensor network, capable of exchanging information in a cloud infrastructure.
Highlights
The Linear Fresnel Reflector (LFR) solar thermal system is a promising technology in solar thermal applications that has attracted significant attention recently, especially for small-scale use with heat output in the range of 150–300 °C [1]
This paper describes a methodology to improve the tracking accuracy of the LFR
In this paper we will deal with a single-axis tracking system where the effective tilt angle is θ
Summary
The Linear Fresnel Reflector (LFR) solar thermal system is a promising technology in solar thermal applications that has attracted significant attention recently, especially for small-scale use with heat output in the range of 150–300 °C [1]. It is arranged in several long rows of flat or slightly concave mirrors that focus the sunlight onto a fixed elevated tubular receiver running parallel to the Proceedings 2019, 42, 58; doi:10.3390/ecsa-6-06534 www.mdpi.com/journal/proceedings. A sun tracking system is provided to allow the mirror segments to rotate around an axis parallel to the receiver. The accuracy of the solar tracker is a key parameter to maximize the solar collector efficiency
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