Heat transfer enhancement analysis of parabolic trough collector with straight and helical absorber tube

Chakraborty, Oveepsa; Das, Biplab; Gupta, R.; Debbarma, Sumita

doi:10.1016/j.tsep.2020.100718

Cited by 34 publications

(18 citation statements)

References 46 publications

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“…The cross-section perpendicular to the concentrator axis is in the form of a parabola. Considering Figure 1, which shows the concentrator cross section in x-y coordinates, the parabolic equation is [18][19][20]…”

Section: Methodsmentioning

confidence: 99%

“…By placing the values of y and x from equation (2) into equation (3), finally, the focal length of the parabola is obtained as follows [9][10][11][12][13][14][15][16][17][18][19][20]:…”

Section: Methodsmentioning

confidence: 99%

“…A large amount of it after passing the aperture of the concentrator hits the parabolic mirror and, after reflecting from the mirror reflection, concentrates on the absorber pipe. The amount of radiation absorbed to the outer surface of the absorber pipe after reflection in the mirror is as follows [18]:…”

Section: Methodsmentioning

confidence: 99%

“…The U I and U C heat transfer coefficients are both defined based on the outer surface of the receiver pipe. On the other hand, due to the fact that the temperature of the fluid increases by dT, then [18][19][20]…”

Section: Methodsmentioning

confidence: 99%

“…The first generations of linear parabolic surfaces were made of 4 mm glass which was heavy and expensive. Recently, new advances have been made to reduce costs and weight and use new methods and materials such as polished aluminum instead of glass mirrors [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Modeling and Analysis of Energy/Exergy for Absorber Pipes of Linear Parabolic Concentrating Systems

Alayi

Mohkam

Monfared

et al. 2021

International Journal of Photoenergy

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In this paper, the physical parameters of the absorber pipe of a linear parabolic collector have been investigated. The types of solar collectors, specifically the linear parabolic collector, have been comprehensively studied. Then, the mathematical model of heat transfer in the absorber pipe of the collector has been presented based on valid references. Numerical solutions of the equations related to the absorber pipe were performed by MATLAB software, and the effects of the physical parameters of the absorber pipe on its efficiency were investigated. The results show that increasing the length of the absorber pipe causes a nonlinear decrease in the efficiency of the absorber pipe. One of the important results is the increase in fluid temperature due to the increase in the diameter of the adsorbent tube, which increases the diameter of the fluid temperature by 60 K, in which the parameter increases the efficiency by 0.38%.

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Section: Methodsmentioning

confidence: 99%

“…By placing the values of y and x from equation (2) into equation (3), finally, the focal length of the parabola is obtained as follows [9][10][11][12][13][14][15][16][17][18][19][20]:…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Modeling and Analysis of Energy/Exergy for Absorber Pipes of Linear Parabolic Concentrating Systems

Alayi

Mohkam

Monfared

et al. 2021

International Journal of Photoenergy

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A Novel Optimized Solar Trough Profile for Better Solar Energy Collection, Storage, and Levelized Cost

Shaaban

2022

Energy Tech

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Clean and sustainable renewable energy resources provide a feasible solution for electrical power generation nowadays. This encourages many countries around the world to increase their renewable energy share. In a reference case, Egypt aims at increasing its renewable energy share in electricity generation from 9% in 2014 to 25% in 2030. [1] High rates of solar energy are available most of the year in Egypt. According to the solar atlas of Egypt, [2] the annual averaged direct normal irradiance (DNI) in Egypt is 292 W m À2 while the monthly averaged maximum DNI reaches 450 W m À2 . Moreover, Egypt has 2554 and 2208 kWh m À2 of available solar energy for concentrated solar power (CSP) and photovoltaic (PV), [2] respectively. Therefore, both the CSP and PV technologies are implemented in Egypt. While PV is cheaper than CSP, the latter is fully dispatchable. [3] Moreover, a PV with storage batteries is more expensive than a CSP with thermal energy storage (TES). [3] Therefore, recent investigations show that CSP and PV are complementary technologies rather than competitive ones. [3][4][5] However, Egypt has not integrated CSP and PV technologies in commercial power plants so far. CSP is a good choice for Egypt due to the high DNI and the hot climate conditions. Accordingly, Egypt has constructed a CSP plant in Kuraymat (100 km south of Cairo). The solar field in Kuraymat implements parabolic trough collectors (PTCs) with a total field aperture area of 130 800 m 2 . [6] Figure 1 shows the main components of the parabolic trough collector (PTC). A parabolic-shaped reflector collects the sun's rays and reflects them through a glass tube onto a receiver tube. The receiver tube absorbs the incident and reflected solar radiation and utilizes this energy to increase the temperature of a heat transfer fluid (HTF) that flows inside the receiver tube. The levelized cost of energy (LCOE) is one of the most significant parameters that indicate the feasibility of an electrical power generation technology. It is always desired to reduce the LCOE of every power generation technology to make it commercially competitive. Reducing the LCOE of the CSP plants with PTC technology can be attained by increasing the overall thermal efficiency while reducing the capital and running costs. El Hamdani et al. [7] estimated the impact of the DNI, solar multiple, mirrors efficiency, cycle efficiency, and absorber efficiency on the reduction of the LCOE of a 1MWe parabolic trough plant at different sites in Morocco. Aseri et al. [8] investigated the possibility of reducing the high capital cost of PTCs. They attained a 29.9% reduction in capital cost by implementing large aperture area PTCs with molten salt as both HTF and storage medium. Lopes et al. [9] showed a 6.3% reduction in LCOE when applying the HitecXL molten salt in a 50 MWe/7.5 h-of-storage power plant. They simulated the plant performance using NREL's System Advisor Model (SAM) software. [10] Tahir et al. [11] estimated the minimum LCOE for a 100 MW PTC power plant in six different ...

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Performance of parabolic trough collector having rotating receiver: Effect of elliptical insert and hybrid nanofluid

Chakraborty

Das

Gupta

2022

Intl J of Energy Research

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Summary This study considers three parabolic trough collector models with rotating receiver tubes and elliptical inserts of two orientations and one with a smooth receiver tube. Hybrid nanofluid is considered as a working medium by mixing copper oxide and aluminum oxide nanoparticles in water. Computational experiments are performed with a 1% concentration in terms of vol. of hybrid nanofluids by considering a mixture of copper oxide and aluminum oxide nanoparticles in water (aluminum oxide 25%‐ copper oxide 75%, aluminum oxide 50%‐ copper oxide 50%, and aluminum oxide 75%‐ copper oxide 25%). Rate of flow for the simulation is considered to vary from 0.016 to 0.033 kg/s. Again, this study focuses on utilizing rotating receiver tubes with a varying velocity of 0‐15 rad/s to overcome the stratification of high temperature at the surface. Results show that enhanced values for the temperature at outlet, heat transfer coefficient, and thermal efficiency are noted for a model with elliptical inserts of major diameter 28 mm (longitudinal orientation) at 15 rad/s receivers speed for nanofluid‐1 (aluminum oxide 75%‐ copper oxide 25%) at 0.033 kg/s. The highest increment in heat transfer coefficient, as well as thermal efficiency for the model with a 28 mm major diameter elliptical insert (longitudinal orientation), is 44.21% and 29.21% respectively. Highlights Use of a spinning receiver reduces the problem of uneven temperature distribution at receiver surface. Maximum 375 K outlet temperature is noted at 15 rad/s for elliptical insert of diameter 28 mm (longitudinal orientation) at 0.016 kg/s. The elliptical insert received the maximum thermal efficiency rating of 82.03%. An elliptical insert in receiver increases pump work by 18.13% than smooth receiver.

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Heat transfer enhancement analysis of parabolic trough collector with straight and helical absorber tube

Cited by 34 publications

References 46 publications

Modeling and Analysis of Energy/Exergy for Absorber Pipes of Linear Parabolic Concentrating Systems

Modeling and Analysis of Energy/Exergy for Absorber Pipes of Linear Parabolic Concentrating Systems

A Novel Optimized Solar Trough Profile for Better Solar Energy Collection, Storage, and Levelized Cost

Performance of parabolic trough collector having rotating receiver: Effect of elliptical insert and hybrid nanofluid

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