Analysis of optical and thermal factors’ effects on the transient performance of parabolic trough solar collectors

Xu, Long; Sun, Feihu; Ma, Linrui; Li, Xiaolei; Lei, Dongqiang; Yuan, Guofeng; Zhu, Huibin; Zhang, Qiangqiang; Xu, Erqi; Wang, Zhifeng

doi:10.1016/j.solener.2018.12.070

Cited by 29 publications

(8 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…𝑄 𝑐 𝑎−𝑔 and 𝑄 𝑟 𝑎−𝑔 are the energies lost from absorber into glass cover by convection and radiation respectively. The convection heat transfer in annulus and mainly depending on the pressure in annulus, where at pressure less than (1torr), the collisions seldom occur between molecules of gas in annulus, therefore the heat transmits by free-molecular convection Xu et al (2019); Yunus A. Çengel (2015).…”

Section: ‫البيضاء‬ ‫جامعة‬ ‫مجلة‬mentioning

confidence: 99%

Mathematical Model of Parabolic Trough Collector with Fresnel Lens as Second Collector

Al-Salihi,

Yehya

2024

BUJ

View full text Add to dashboard Cite

Parabolic trough collectors (PTCs) have came out as a promising technology for harnessing solar energy for various applications including electricity generation and thermal heating. However, improving their thermal performance remains a critical challenge to maximize energy conversion efficiency. This paper presents a mathematical model for enhancing the thermal performance of PTCs by using a curved Fresnel lens as a second collector over the top side of the receiver. This enhancing has taken advantage of the space above the top side of receiver and increased the thermal efficiency of PTCs. The unsteady heat transfer equations with one dimension are used to simulate the effect of Fresnel lens on the receiver components beside the heat transfer fluid and compared with that without Fresnel lens. The results of this model are based on parameters of LS-2 model and environment of installation place whereas the water was chosen as heat transfer fluid with physical properties depending on Temperature. Al-Baydha city in Yemen is chosen as an installation place taking in consideration the variation of environment temperature in each month of the year and the inlet temperature of water and receiver‘s components are taken as the minimum temperature of the air. Keywords: Mathematical Model; Parabolic Trough Collector; Fresnel Lens ; Solar

show abstract

Section: ‫البيضاء‬ ‫جامعة‬ ‫مجلة‬mentioning

confidence: 99%

Mathematical Model of Parabolic Trough Collector with Fresnel Lens as Second Collector

Al-Salihi,

Yehya

2024

BUJ

View full text Add to dashboard Cite

show abstract

“…Recently, Xu et al introduced a mathematical model to study the unsteady thermal performance of the PTC under different fluid inlet temperatures and DNIs. It was concluded that the working fluid motion has no strong effect on the receiver temperatures.…”

Section: Literature Review Of Ptcsmentioning

confidence: 99%

An extensive review of various technologies for enhancing the thermal and optical performances of parabolic trough collectors

Abed

Afgan

2020

Int J Energy Res

View full text Add to dashboard Cite

A wide range of engineering industrial applications require both the thermal and optical efficiencies of the system to be maximized with a reasonable low penalty for the friction factor and subsequently low losses in pressure. Among the family of concentrated solar power systems, parabolic trough collectors (PTCs), which have recently received significant attention, face similar challenges. The current work presents an extensive review of the PTC systems comparing recent and past technologies, which are widely being used to improve and enhance the thermal and optical efficiencies. Furthermore, the techniques used for single and two-phase flow modeling in numerical simulations, design variables, and experimental processes have been discussed in detail. The article also presents different numerical methods and analytical approaches of implementing the nonuniform solar distribution with different design parameters. Four main technologies are comprehensively addressed to effectively enhance the thermal performance of the PTCs; changing working heat transfer fluids, replacing the working fluids by nanofluids (single and hybrid) that have higher thermal-physical properties than those of base working fluids, inserting different tabulators with various design configurations, and finally combining the advantages of nanofluids and swirl generators in the same application. The article also critically summarizes the studies investigating the enhancement of thermal performance: use of novel design of PTCs and passive heat transfer enhancement techniques. Finally, a wide range of numerical and experimental studies are proposed for the future work related to the aforementioned main technologies. K E Y W O R D Sheat transfer enhancements, nanofluids, parabolic trough solar collectors, solar thermal energy, tabulators, thermal and optical performances

show abstract

“…An investigation on the transient thermal performance of SPTC has been conducted using a mathematical model for experimental data collected from the 600-m-long SPTC collectors. Both the optical and thermal performance of the system have been investigated for better output with respect to various operating conditions [25]. An experimental study has been carried out for finding the effect of the absorber tube displacement in parabolic trough collectors using a novel approach with respect to the vertical and lateral displacement of the tubes [26].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Optical Design and Performance of a Single-Axis-Tracking Solar Parabolic trough Collector with a Secondary Reflector

Subramaniyan¹,

Subramani²,

Kalidasan³

et al. 2021

Sustainability

View full text Add to dashboard Cite

The design of solar concentrating collectors for the effective utilization of solar energy is a challenging condition due to tracking errors leading to different divergences of the solar incidence angle. To enhance the optical performance of solar parabolic trough collectors (SPTC) under a diverged solar incidence angle, an additional compound parabolic concentrator (CPC) is introduced as a secondary reflector. SPTC with CPC is designed and modeled for a single axis-tracking concentrating collector based on the local ambient conditions. In this work, the optical performance of the novel SPTC system with and without a secondary reflector is investigated using MATLAB and TRACEPRO software simulations for various tracking errors. The significance parameters such as the solar incidence angle, aperture length, receiver tube diameter, rim angle, concentration ratio, solar radiation, and absorbed flux are analyzed. The simulation results show that the rate of the absorbed flux on the receiver tube is significantly improved by providing the secondary reflector, which enhances the optical efficiency of the collector. It is found that the optical efficiency of the SPTC with a secondary reflector is 20% higher than the conventional collector system for a solar incidence angle of 2°. This work can effectively direct the choice of optimal secondary reflectors for SPTC under different design and operating conditions.

show abstract

Analysis of optical and thermal factors’ effects on the transient performance of parabolic trough solar collectors

Cited by 29 publications

References 18 publications

Mathematical Model of Parabolic Trough Collector with Fresnel Lens as Second Collector

Mathematical Model of Parabolic Trough Collector with Fresnel Lens as Second Collector

An extensive review of various technologies for enhancing the thermal and optical performances of parabolic trough collectors

Investigation on the Optical Design and Performance of a Single-Axis-Tracking Solar Parabolic trough Collector with a Secondary Reflector

Contact Info

Product

Resources

About