Heat transfer model for thermal performance analysis of parabolic trough solar collectors using nanofluids

Tagle-Salazar, Pablo D.; Nigam, K.D.P.; Rivera-Solorio, Carlos I.

doi:10.1016/j.renene.2018.02.069

Cited by 69 publications

(13 citation statements)

References 43 publications

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“…While some research has a negligible enhancement compared with base fluid, where this enhancement did not exceed 0.033%. it is depending on the use of an un-evacuated tube, and the accuracy of measuring test [25]. The achieved overall thermal efficiency using nanofluid flow inside the vacuumed copper tube showed high enhancement results compared with the unvacuumed tubes for the same nanofluid concentration.…”

Section: Nanofluid Experimental Workmentioning

confidence: 99%

Recent experimental enhancement techniques applied in the receiver part of the parabolic trough collector – A review

Al–Oran

Lezsovits

2020

IRASE

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Recently, the thermal performance of the parabolic trough collector (PTC), augmented to be more applicable and efficient, received intensive research. These studies aimed to improve heat transfer in the receiver part, in order to decrease the heat loss, and enhance the heat transfer to the thermal fluid. Many previous review papers focused on the numerical sides rather than the experimental side. Several research papers recommended doing more research in the experimental field; in order to decrease the gap between the numerical and experimental results, as well as increase the confidence level of what has been done in the theoretical field researches. Regarding the recommendations of the recent papers to decrease the gap between numerical and experimental aspects, this review paper focused on the recent experimental research related to thermal enhancement performance in the receiver part of the parabolic solar collector. In this research, different categories of the enhancement methods are discussed in detail through this review, namely nanofluids, surface modifications, and inserts models or the two categories combined together. We discussed these categories for different parabolic troughs considering only the recent experimental research between the period from 2014 up to 2019. Some parameters were discussed, such as the main dimensions of the examined receiver and parabolic collector. Moreover, types of nanoparticle specifications and preparation methods with different base fluids were highlighted. In addition, we discussed different aspects of using inserts models and inlet and outlet surface modification methods. Finally, the main thermal efficiency and thermal performance enhancement results for each work were presented.

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Section: Nanofluid Experimental Workmentioning

confidence: 99%

Recent experimental enhancement techniques applied in the receiver part of the parabolic trough collector – A review

Al–Oran

Lezsovits

2020

IRASE

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“…Roldán et al considered water/steam as working fluid and analyzed the behavior of the receiver. Tagle‐Salazar et al and Qiu et al used alumina‐water nanofluid and supercritical CO 2 as HTF to improve the performance of the receiver. Kumaresan et al dealt with the enhancement of heat transfer in the receiver by use of nanofluid, turbulators, and selective coatings.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer analysis of receiver for large aperture parabolic trough solar collector

2019

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Summary Parabolic trough solar collector (PTSC) is one of the most proven technologies for large‐scale solar thermal power generation. Currently, the cost of power generation from PTSC is expensive as compared with conventional power generation. The capital/power generation cost can be reduced by increasing aperture sizes of the collector. However, increase in aperture of the collector leads to higher heat flux on the absorber surface and results in higher thermal gradient. Hence, the analysis of heat distribution from the absorber to heat transfer fluid (HTF) and within the absorber is essential to identify the possibilities of failure of the receiver. In this article, extensive heat transfer analysis (HTA) of the receiver is performed for various aperture diameter of a PTSC using commercially available computational fluid dynamics (CFD) software ANSYS Fluent 19.0. The numerical simulations of the receiver are performed to analyze the temperature distribution around the circumference of the absorber tube as well as along the length of tube, the rate of heat transfer from the absorber tube to the HTF, and heat losses from the receiver for various geometric and operating conditions such as collector aperture diameter, mass flow rate, heat loss coefficient (HLC), HTF, and its inlet temperature. It is observed that temperature gradient around the circumference of the absorber and heat losses from the receiver increases with collector aperture. The temperature gradient around the circumference of the absorber tube wall at 2 m length from the inlet are observed as 11, 37, 48, 74, and 129 K, respectively, for 2.5‐, 5‐, 5.77‐, 7.5‐, and 10‐m aperture diameter of PTSC at mass flow rate of 1.25 kg/s and inlet temperature of 300 K for therminol oil as HTF. To minimize the thermal gradient around the absorber circumference, HTFs with better heat transfer characteristics are explored such as molten salt, liquid sodium, and NaK78. Liquid sodium offers a significant reduction in temperature gradient as compared of other HTFs for all the aperture sizes of the collector. It is found that the temperature gradient around the circumference of the absorber tube wall at a length of 2 m is reduced to 4, 8, 10, 13, and 18 K, respectively, for the above‐mentioned mass flow rate with liquid sodium as HTF. The analyses are also performed for different HTF inlet temperature in order to study the behavior of the receiver. Based on the HTA, it is desired to have larger aperture parabolic trough collector to generate higher temperature from the solar field and reduce the capital cost. To achieve higher temperature and better performance of the receiver, HTF with good thermophysical properties may be preferable to minimize the heat losses and thermal gradient around the circumference of the absorber tube.

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“…Therefore, mathematical models are required. Some mathematical modeling of the PTC [44,45] and absorption chiller [46] are developed respectively for applicability illustration.…”

Section: Introductionmentioning

confidence: 99%

Mathematical modeling and performance analysis of an integrated solar heating and cooling system driven by parabolic trough collector and double-effect absorption chiller

Zheng

Shi

Wang

et al. 2019

Energy and Buildings

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With the increasing concerns on energy conservation and environmental protection, solar heating and cooling (SHC) system represents an attractive candidate in building sector. In this paper, an integrated SHC system driven by parabolic trough collector (PTC) and double-effect H2O/LiBr absorption chiller was presented. The energy generated by solar collectors was supplied to the absorption chiller during the cooling period, and was directly used for space heating with the integration of plate heat exchanger during the heating period. The mathematical models of the whole system 2 including the collector, the double-effect absorption chiller and the plate heat exchanger were established and were validated by field tests. Based on the proposed models, comparison of the SHC system and the conventional gas-driven absorption heating and cooling system was carried out by case study. The annual performances as well as energetic, economic and environmental assessments of the proposed system were investigated. Results show that, 21.3% of the primary energy consumption and 18.8% of the CO2 emission can be reduced in SHC system. Therefore, the proposed integrated solar heating and cooling system has a promising application prospect in sustainable development in view of its considerable energy saving benefits, potential economic viability and environmental friendly characteristics.

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Heat transfer model for thermal performance analysis of parabolic trough solar collectors using nanofluids

Cited by 69 publications

References 43 publications

Recent experimental enhancement techniques applied in the receiver part of the parabolic trough collector – A review

Recent experimental enhancement techniques applied in the receiver part of the parabolic trough collector – A review

Heat transfer analysis of receiver for large aperture parabolic trough solar collector

Mathematical modeling and performance analysis of an integrated solar heating and cooling system driven by parabolic trough collector and double-effect absorption chiller

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