Abstract
A multitude of the researches focus on the factors of the thermal efficiency of a parabolic trough solar collector, that is, the optical-thermal efficiency. However, it is limited to a single or double factors for available system. The aim of this paper is to investigate the multifactors effect on the system’s efficiency in cold climate region. Taking climatic performance into account, an average outlet temperature of LS-2 collector has been simulated successfully by coupling SolTrace software with CFD software. Effects of different factors on instantaneous efficiency have been determined by orthogonal experiment and single factor experiment. After that, the influence degree of different factors on the collector instantaneous efficiency is obtained clearly. The results show that the order of effect extent for average maximal deviation of each factor is inlet temperature, solar radiation intensity, diameter, flow rate, condensation area, pipe length, and ambient temperature. The encouraging results will provide a reference for the exploitation and utilization of parabolic trough solar collector in cold climate region.
Highlights
With the increasing attention of the international community about energy problem, solar energy and the other renewable energies rise gradually on large-scale application [1]
Effects of different factors on instantaneous efficiency have been determined by orthogonal experiment and simulated for each group of experiments
Taking climatic performance into account, effects of different factors on instantaneous efficiency have been determined by orthogonal experiment and single factor experiment
Summary
With the increasing attention of the international community about energy problem, solar energy and the other renewable energies rise gradually on large-scale application [1]. Under this background, the solar energy converting technology, especially concentrating light technology, has a broad prospect. There are several common concentrating collectors, such as trough type, dish type, and tower type. Compared with the other two collectors, the trough solar energy collector has been widely used. Based on the above characteristics, a multitude of the researches focus on the factors of the thermal efficiency of a parabolic trough collector from a view of the optical and thermal properties
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