Author
G. W. Treadwell
Bio: G. W. Treadwell is an academic researcher. The author has contributed to research in topics: Solar mirror & Parabolic reflector. The author has an hindex of 1, co-authored 1 publications receiving 35 citations.
Papers
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01 Jul 1976
TL;DR: In this article, the authors present in some detail the various significant factors which influence the design of parabolic-cylindrical solar collectors, and present a survey of the most important factors.
Abstract: This report presents in some detail the various significant factors which influence the design of parabolic-cylindrical solar collectors.
35 citations
Cited by
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TL;DR: In this paper, a different approach to evaluate the heat loss factor of a tubular absorber with a concentric glass cover, often employed as the target of a linear solar concentrator, is proposed.
117 citations
TL;DR: In this article, the effect of parameters such as absorber tube coating and design parameters on the performance of parabolic trough collectors (PTCs) is discussed and passive methods for heat transfer enhancement in PTCs are investigated.
Abstract: Improving the performance of solar collectors has been recently a subject of intense research because of its advantages such as a decrease in the size and cost of systems and an increase in the thermal performance. Among solar collectors, parabolic trough collectors (PTCs) are of great importance because of their applicability. PTCs are widely used in Concentrated Solar Power Plants (CSP), and Industrial Process Heat (IPH), which demand high and low-temperature heat, respectively. Thermal oils have been extensively utilized as the working fluids in solar thermal electric plants (STE) with PTCs. However, their operating temperature limitation and environmental pollution have caused employing alternative working fluids. The present study is conducted to evaluate the thermal efficiency enhancement methods in PTCs. The effect of parameters such as absorber tube coating and design parameters on the performance of PTCs is also discussed. Moreover, passive methods for heat transfer enhancement in PTCs are investigated and the effect of using nanofluids as a working fluid is reviewed. This review can open new horizons for further investigations in this field.
107 citations
Journal Article•
TL;DR: In this paper, a semiinite analytical formulation is presented to facilitate the efficient numerical computation of the concentrated radiant flux on receiver surfaces in the parabolic trough concentrator, and the concentrated flux density is integrated to yield the interceptance ratio for the collector.
Abstract: A semifinite analytical formulation is presented to facilitate the efficient numerical computation of the concentrated radiant flux on receiver surfaces in the parabolic trough concentrator. The concentrated flux density is integrated to yield the interceptance ratio for the collector. By including models for the incident-angle dependent envelope transmittance and receiver absorptance, the concentration ratio for absorbed radiation is also calculated and integrated to yield the optical efficiency. Flux distribution results from this detailed analysis are compared with a point source model, and the optical efficiency results are compared with a first-order model. Since this model includes both a realistic nonuniform solar modeling as well as models for imperfect reflection, transmission, and absorption, it is capable of estimating the optical efficiency of practical collectors.
98 citations
TL;DR: In this article, a semiinite analytical formulation is presented to facilitate the efficient numerical computation of the concentrated radiant flux on receiver surfaces in the parabolic trough concentrator, and the concentrated flux density is integrated to yield the interceptance ratio for the collector.
98 citations
TL;DR: In this paper, a comparison of the advantages and disadvantages of concentrating collectors against conventional flat-plate collectors is presented, followed by the design of a parabolic-trough solar collector system, due consideration having been given to collector-aperture and rim-angle optimisation, together with the receiver-diameter selection.
97 citations