Next Article in Journal
A Novel Strategy to Reduce Computational Burden of the Stochastic Security Constrained Unit Commitment Problem
Next Article in Special Issue
Numerical Modelling and Experimental Validation of Twin-Screw Expanders
Previous Article in Journal
An Efficient Robust Predictive Control of Main Steam Temperature of Coal-Fired Power Plant
Article

Assessment and Evaluation of the Thermal Performance of Various Working Fluids in Parabolic Trough Collectors of Solar Thermal Power Plants under Non-Uniform Heat Flux Distribution Conditions

1
Department of Mechanical, Aerospace, and Civil engineering, School of Engineering, University of Manchester, Manchester M1 3BB, UK
2
Mechanical Technical Department, Technical Institute of Anbar, Middle Technical University, Baghdad 10074, Iraq
3
Department of Mechanical Engineering, College of Engineering, Khalifa University of Science and Technology, P.O. Box 127788, Abu Dhabi, UAE
*
Author to whom correspondence should be addressed.
Energies 2020, 13(15), 3776; https://doi.org/10.3390/en13153776
Received: 2 June 2020 / Revised: 15 July 2020 / Accepted: 22 July 2020 / Published: 23 July 2020
(This article belongs to the Special Issue Advances in Low-Temperature Solar Organic Rankine Cycle System)
Changing the heat transfer fluid (HTF) is a viable approach to study the corresponding effect on the thermal and hydraulic performances of parabolic trough collectors (PTC). Three categorized-types of pure fluids are used in this study; water, Therminol® VP-1 and molten salt. The parametric comparison between pure fluids is also studied considering the effect of various inlet fluid temperatures and different Reynolds ( R e ) numbers on the thermal performance. Two low-Reynolds turbulence models are used; Launder and Sharma (LS) k-epsilon and Shear Stress Transport (SST) k-omega models. In order to assess the performance of each fluid, a number of parameters are analyzed including average Nusselt ( N u ) number, specific pressure drop distributions, thermal losses, thermal stresses and overall thermal efficiency of the PTC system. Results confirmed that changing the working fluid in the PTC enhances the overall heat transfer thereby improving thermal efficiency. For a temperature-range of (320–500) K, the Therminol® VP-1 performed better than water, resulting in higher N u numbers, lower thermal stresses and higher thermal efficiencies. On the other hand, for the common temperature-range, both Therminol® VP-1 and molten salt preformed more or less the same with Therminol® VP-1 case depicting lower thermal stresses. The molten salt is thus the best choice for high operating temperatures (up to 873 K) as it does not depict any significant reduction in the overall thermal efficiency at high temperatures; this leads to a better performance for the Rankine cycle. For the highest tested Reynolds number for an inlet fluid temperature of 320 K, a comparison of heat transfer performance (Nusselt number) and the overall thermal efficiency between Therminol® VP-1 and water showed that Therminol® VP-1 is the best candidate, whereas the molten salt is the best choice for a higher inlet temperature of 600 K. For example, at an inlet temperature of 320 K, the Nusselt number and overall thermal efficiency of therminol VP-1 were 910 and 49% respectively as opposed to 443 and 38% for water. On the other hand, at the higher inlet temperature of 600 K, these two parameters (Nusselt number and overall thermal efficiency) were recorded as 614 and 41 % for molten salt and 500 and 39 % for Therminol® VP-1. View Full-Text
Keywords: heat transfer fluids; non-uniform heating; Nusselt number; parabolic solar trough collectors; Rankine cycle; solar thermal power plant; thermal and hydraulic performance heat transfer fluids; non-uniform heating; Nusselt number; parabolic solar trough collectors; Rankine cycle; solar thermal power plant; thermal and hydraulic performance
Show Figures

Figure 1

MDPI and ACS Style

Abed, N.; Afgan, I.; Cioncolini, A.; Iacovides, H.; Nasser, A. Assessment and Evaluation of the Thermal Performance of Various Working Fluids in Parabolic Trough Collectors of Solar Thermal Power Plants under Non-Uniform Heat Flux Distribution Conditions. Energies 2020, 13, 3776. https://doi.org/10.3390/en13153776

AMA Style

Abed N, Afgan I, Cioncolini A, Iacovides H, Nasser A. Assessment and Evaluation of the Thermal Performance of Various Working Fluids in Parabolic Trough Collectors of Solar Thermal Power Plants under Non-Uniform Heat Flux Distribution Conditions. Energies. 2020; 13(15):3776. https://doi.org/10.3390/en13153776

Chicago/Turabian Style

Abed, Nabeel; Afgan, Imran; Cioncolini, Andrea; Iacovides, Hector; Nasser, Adel. 2020. "Assessment and Evaluation of the Thermal Performance of Various Working Fluids in Parabolic Trough Collectors of Solar Thermal Power Plants under Non-Uniform Heat Flux Distribution Conditions" Energies 13, no. 15: 3776. https://doi.org/10.3390/en13153776

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop