Journal
RENEWABLE ENERGY
Volume 170, Issue -, Pages 327-340Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.renene.2021.01.138
Keywords
Solar cascade heat collection; Novel parabolic trough receiver; Inner tube; Wing-like fringe; Overall efficiency
Funding
- National Natural Science Foundation of China [51736004]
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The novel parabolic trough receiver (NPTR) proposed in this work improves heat-collecting efficiency and provides different grades of thermal energy, with β=180 degrees recommended as the suggested design. Compared to conventional receivers, the NPTR effectively reduces heat loss and increases overall efficiency.
In this work, a novel parabolic trough receiver (NPTR) with an inner tube and wing-like fringe was proposed to improve heat-collecting efficiency as well as provide different grades of thermal energy. Thermal oil and water, which flow respectively in absorber and the inner tube, are selected as high and low temperature heat transfer fluids. A three-dimensional computational fluid dynamics model was developed to investigate the performance of the NPTR. Effects of geometrical parameter and thermal conductivity of inner tube on the performance of NPTR were studied in details. Based on the results, the NPTR with beta = 180 degrees is recommended as the suggested design. Moreover, performance of the suggested design under different direct normal irradiances (300-1000 W/m(2)) and inlet temperature of oil (400-650 K) were evaluated. Compared to the conventional parabolic trough receiver, the heat loss of NPTR is effectively reduced by 33.1-50.1%, and the overall efficiency can be improved by 0.61%-7.67%. Moreover, the proportions of oil and water heat gains in the total input solar energy are ranged in-18.8-63.5% and 8.39-77.6%, and the temperature gains of oil and water are ranged in-1.4-19.5 K and 5.4-18.8 K, respectively. (C) 2021 Elsevier Ltd. All rights reserved.
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