Comparison of Two Sun Tracking Methods in the Application of a Heliostat Field
Author:
Chen Y. T.1, Kribus A.2, Lim B. H.1, Lim C. S.1, Chong K. K.1, Karni J.3, Buck R.4, Pfahl A.4, Bligh T. P.5
Affiliation:
1. Institute of Energy and Environment, Malaysia University of Science and Technology, C901, Kelana Square, No. 17, Jln SS7/26, Kelana Jaya, 47301 Petaling Jaya, Selangor, Malaysia 2. Dept. of Fluid Mechanics and Heat Transfer, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel 3. Environmental Science and Energy Research Department, Weizmann Institute of Science, Rehovot 76100, Israel 4. Institute of Technical Thermodynamics, German Aerospace Center (DLR), Pfaffenwaldring 38-40, Stuttgart 70569, Germany 5. Department of Engineering, University of Cambridge, Trumpington Street, Cambridge, CB2 1PZ, United Kingdom
Abstract
The basic mathematics and structure of heliostat have remained unchanged for many decades. Following the challenge first made by Ries et al., the non-imaging focusing heliostat recently proposed by Chen et al. provides an alternative in the field of concentrated solar energy. This paper investigates the performance of a heliostat field composed of the newly proposed heliostats. In contrast to the dynamic curvature adjustment proposed in our previous work for a solar furnace, a fixed asymmetric curvature is used here with the spinning-elevation tracking method. This restriction is intended to equalize the manufacture cost of the new heliostat with that of traditional heliostats with azimuth-elevation tracking and spherical curvature. Fixing the curvature results in only partial aberration correction, compared to full correction using the dynamic adjustment of curvature. Nevertheless, the case studies presented in this paper show that the new heliostat design can reduce the receiver spillage loss by 10–30%, and provide a much more uniform performance without large variations with time of day.
Publisher
ASME International
Subject
Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment
Reference10 articles.
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