Enhancing the thermal efficiency of parabolic trough collector using rotary receiver tube

Reddy, N. Sreenivasalu; Subramanya, S. Gowreesh; Vishwanath, K. C.; Karthikeyan, M.; Kanchiraya, S.

doi:10.1016/j.seta.2021.101941

Cited by 8 publications

(4 citation statements)

References 47 publications

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“…Additionally, the average surface temperature of the tube decreased by 60 K. The collector's efficiency can vary based on the chosen rotational speed for each Reynold's number, either increasing or decreasing. In their research, N. Sreenivasalu Reddy et al [6] conducted an experimental study on the performance of a parabolic trough collector with a rotating motion applied to the receiver tube. The tube is subjected to two distinct speeds: 2 revolutions per minute (rpm) and 4 rpm, in addition to a study where the tube remains motionless.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Parabolic Trough Solar Collector Efficiency through Absorber Tube Rotation: A Computational Study

Mohan Das A N, Sudeep Kumar T

2024

pst

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This work uses CFD simulations to examine how absorber tube rotation affects parabolic trough solar collector performance, including output temperature, thermal efficiency, and surface temperature distribution. Simulation results are closely matched to experimental data, with variances ranging from 0.54% to 4.63%. It examines how mass flow rates (0.01 kg/s, 0.015 kg/s, and 0.02 kg/s) and input temperatures (32°C to 38°C) affect system performance in stationary and rotational modes at 1 and 2 rpm. Tube rotation considerably improves thermal mixing in the heat transfer fluid (HTF), resulting in more equal temperature distribution and possibly improved heat transfer efficiency. Increased rotational speed causes complicated dynamics that slightly impair thermal efficiency due to centrifugal forces affecting fluid flow patterns. The study shows that thermal efficiency peaks in the morning, emphasizing the importance of climatic and operational factors on collector performance. DOI: https://doi.org/10.52783/pst.276

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Section: Introductionmentioning

confidence: 99%

Enhancing Parabolic Trough Solar Collector Efficiency through Absorber Tube Rotation: A Computational Study

Mohan Das A N, Sudeep Kumar T

2024

pst

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“…Further, under the working temperature between 290 and 550 °C, the heat loss of the multi-division approach was decreased by 29%, also the thermal performance was improved by 4% 35 . Subramanya et al 36 studied experimentally the performance of the PTC, operating a rotational receiver tube by velocity from 0 to 4 rpm, various inner temperatures, and flow rates. Multiple parameters are examined, such as thermal performance, temperature boost, and friction characteristics.…”

Section: Introductionmentioning

confidence: 99%

A novel dual feedwater circuit for a parabolic trough solar power plant

Al-Maliki

Alsaedi

Khafaji

et al. 2023

Sci Rep

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The validated dynamic model of a parabolic trough power plant (PTPP) is improved by the combination of a new feedwater circuit (feedwater/HTF circuit) and a reference feedwater circuit (feedwater/steam circuit) as well as the development of the steam turbine model. Such design represents the first effort of research to utilize a dual feedwater circuit inside the PTPP to increase the power output in the daylight from 50 to 68 MWel and raise night operating hours at a lower cost. The purpose of increasing the operating night hours at a power (48 MWel) as in the reference PTPP is to get rid of the fossil fuel backup system and rely only on the absorbed solar energy and the stored energy in the molten salt. During daylight hours, the feedwater circuit is operated using Feedwater/HTF. In the transient period, the feedwater/HTF circuit will gradually be closed due to a decrease in solar radiation. Furthermore, the rest of the nominal feedwater mass flow rate (49 kg/s) is gradually replenished from the feedwater/steam circuit. After sunset, the entirety of the feedwater is heated based on the steam extracted from the turbine. The purpose of this improvement is to raise the number of nightly operational hours by reducing the nominal load from 61.93 to 48 MWel as a result of low energy demand during the evening hours. Therefore, a comparison study between the reference model and this optimization (optimization 2) is conducted for clear days (26th–27th/June and 13th–14th/July 2010) in order to understand the influence of dual feedwater circuit. The comparison indicates that the operational hours of the power block (PB) will be obviously increased. Moreover, this improvement reduces based on the fossil fuel system at night. As the last step, an economic analysis was performed on the costs of the referenced and the optimized PTPP as a function of the levelized energy cost (LEC). The results illustrate that the specific energy cost of a PTPP with 7.5 h of storage capacity is lowered by about 14.5% by increasing the output of the PTPP from 50 to 68 MWel.

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“…Their numerical results show that the triangular wire coil inserts improve the mixing of fluids inside the receiver, resulting in a decrease in the circumferential temperature gradient of the tube. Sreenivasalu Reddy et al 20 investigated experimentally a rotary receiver in PTC technology. They reported that a rotary receiver increases the PTC overall performance compared with the conventional tube.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of an enhanced PTC absorber tube using cylindrical inserts

Haddouche

2023

Heat Trans

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The main purpose of this study is to investigate numerically the thermal performance of a parabolic trough solar collector's absorber tube that contains a novel kind of inserts with the objective to improve the heat transfer between the heat transfer fluid and the absorber tube. In the first part of this paper, the diameter and the length of the cylindrical inserts are investigated based on finite volume method and Monte Carlo ray tracing method for Reynolds number ranges from 2.36 × 10 4 to 7.09 × 10 4 . In the second part, the eccentricity of the cylindrical inserts is investigated under the same operating conditions. The Thermi-nol®VP1 is the HTF that is used in this investigation's intermediate fluid. The numerical simulation indicates that the perturbators enhance the thermal behavior of the receiver and reduces the absorber tube's temperature difference.

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Enhancing the thermal efficiency of parabolic trough collector using rotary receiver tube

Cited by 8 publications

References 47 publications

Enhancing Parabolic Trough Solar Collector Efficiency through Absorber Tube Rotation: A Computational Study

Enhancing Parabolic Trough Solar Collector Efficiency through Absorber Tube Rotation: A Computational Study

A novel dual feedwater circuit for a parabolic trough solar power plant

Numerical investigation of an enhanced PTC absorber tube using cylindrical inserts

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