Two-fluid modeling of direct steam generation in the receiver of parabolic trough solar collector with non-uniform heat flux

Pal, Ram Kumar; Kumar, K. Ravi

doi:10.1016/j.energy.2021.120308

Cited by 31 publications

(12 citation statements)

References 28 publications

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“…According to this equation, the heat transfer coefficient between two cylinders in a vacuum is determined 32

h_{t - c} = \frac{λ}{\frac{D_{t - o}}{2 \ln (\frac{D_{c - in}}{D_{t - o}})} + bq (\frac{D_{t - o}}{D_{c - in}} + 1)} .

λ (\frac{w}{normalm . normalK})

is thermal conductivity, q and b are mean‐free‐path collisions of a molecule and interaction coefficient, which are equal to 88.67 cm and 1.571 for air at a pressure of 0.03 Pa, and a temperature of 30°C 32 …”

Section: The Daptc Specification Of This Study and Methodologymentioning

confidence: 99%

Multi‐objective assessment of a DAPTC based on 4E analysis: Water‐energy‐environment nexus

Saray

Heyhat

2022

Intl J of Energy Research

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Summary This study aims to thermodynamic analysis and optimizes the performance of a nanofluid‐based direct absorption parabolic trough collector (DAPTC) using a non‐dominated sorting genetic algorithm (NSGA‐II). For this purpose, silicon carbide (SiC) and copper oxide (CuO) at three different volume fractions (0.01%, 0.05%, and 0.1%) are used as the nanoparticles and water as the base fluid. The results obtained using the method presented in the current study are verified through experimental results, which are in good agreement with those. A comprehensive analysis is conducted to determine the effect of operating conditions and geometric dimensions on the energy and exergy efficiencies and economic performance of the DAPTC. In addition, an environmental investigation is performed to determine the effect of using nanofluids on CO2, NOx, and SOx reduction. Under the operating conditions, the cost of energy production, when SiC/water and CuO/water nanofluids are utilized instead of the base fluid, is reduced by 31.08% and 47.92%, respectively. The use of SiC/water and CuO/water nanofluids can reduce CO2 emissions by 216.18 and 332.55 kg and also water consumption by 968.1 and 1489.1 m3, respectively. The optimum energy and exergy efficiencies are 65.53% and 38.97%, respectively. Also, the SiC/water and CuO/water nanofluids have a 35% and 67.35% environmental impact, respectively. Highlights Multi‐objective optimization of a DAPTC using the NSGA‐II algorithm. The energy, exergy, economic, and environment of solar collectors were analyzed. The 547.86 MJ energy and 1489.1 m3 water were saved by the exploitation of CuO/water nanofluid. The 316.15 MJ energy and 968.1 m3 water were saved by the exploitation of SiC/water nanofluid. CO2 emissions decreased by 332.55 and 216.18 kg using CuO/water and SiC/water.

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“…According to this equation, the heat transfer coefficient between two cylinders in a vacuum is determined 32

h_{t - c} = \frac{λ}{\frac{D_{t - o}}{2 \ln (\frac{D_{c - in}}{D_{t - o}})} + bq (\frac{D_{t - o}}{D_{c - in}} + 1)} .

λ (\frac{w}{normalm . normalK})

Section: The Daptc Specification Of This Study and Methodologymentioning

confidence: 99%

Multi‐objective assessment of a DAPTC based on 4E analysis: Water‐energy‐environment nexus

Saray

Heyhat

2022

Intl J of Energy Research

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“…The various types of TPF patterns may exist in the receiver [13][14][15]. The quantity and quality of steam at the solar field outlet depends on the inlet flow conditions and solar radiation.…”

Section: Introductionmentioning

confidence: 99%

“…The homogeneous equilibrium multiphase model of STAR-CCM+ computed pressure drops with accuracy within 10% [18]. Pal and Kumar [15] investigated the circumferential temperature distribution, pressure drop, and VVF using Eulerian TFM. Li et al [19] developed an improved SIMPLE algorithm to realize the transient characteristics of the DSG process in once through solar collector rows.…”

Section: Introductionmentioning

confidence: 99%

Effect of position of heat flux profile on the absorber surface of parabolic trough solar collector for direct steam generation

Pal

Kumar

2022

Journal of Energy Systems

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The overall performance of parabolic trough solar collector (PTSC) based power plants could be improved by introducing the Direct steam generation (DSG) in the receiver of the solar collector. However, the thermalhydraulic instability induced in the DSG process is a severe issue for the commercial application of the technology. The concentrated solar flux falling on the dry portion of the absorber before or after solar noon generates a high circumferential thermal gradient in the stratified flow region. In this work, numerical analysis of thermo-hydrodynamics of DSG has been performed to study the effect of position of solar flux profile using CFD solver ANSYS Fluent 2020R1. The TPF in the solar collectors is modeled through two-fluid modeling approach. The inlet mass flow rate and operating pressure for PTSC are considered as 0.6 kg/s, and 100 bar, respectively. The solar beam radiations are considered as 750 W/m2 and 1000 W/m2. The obtained results revealed that temperature distribution at the absorber outer surface varies in the range of 585 K to 643 K. The maximum circumferential temperature difference is observed as 55.5 K. The volume fraction of vapor at the absorber outlet are found as 0.31 and 0.37 respectively for DNI 750 W/m2 and 1000 W/m2. The corresponding pressure losses are 316 Pa and 350 Pa, respectively. The obtained results could be employed to characterize the thermal behavior of the DSG solar collectors. The model is useful to configure the solar field operation for optimum performance.

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“…The parameters of the thermal-hydraulic system with solar heat flux at noon and 2 hours before and after were presented. 17 An analytical dynamic model of a PTC system was presented to study the characteristics of the system. The presented results showed that the system's processes could be captured with the model, which allowed to design and test the controllers of the PTC system.…”

Section: Introductionmentioning

confidence: 99%

“…A 3‐D thermo‐hydrodynamic model of a steam‐generated plant with PTC using an approach of two‐fluid modeling was carried out. The parameters of the thermal‐hydraulic system with solar heat flux at noon and 2 hours before and after were presented 17 . An analytical dynamic model of a PTC system was presented to study the characteristics of the system.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and performance testing of a novel parabolic trough collector

Chargui

Tashtoush

Awani

2021

Intl J of Energy Research

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Summary This work presents an experimental evaluation of a new design of a parabolic trough solar collector (PTC). To maximize the energy yield, a solar tracking system is implemented. The thermal performance of the PTC at three outdoor test methods is evaluated. The new design essentially affects the balloon, the trunk, the insulation, the inner reflector, the glass, the upper plane reflector, and the cover. The system performance with bi‐axial orientation and an absorber with a glass‐covered envelope is compared with two other designs of mono‐ and bi‐axial orientation without a glass‐covered envelope. The tests of the PTC with an aperture area of 2.88 m2 were conducted in Tunisian weather conditions, and the results are compared with similar systems already published data in the literature. A dynamic simulation with TRNSYS software is developed to evaluate the system performance based on experimental results. An economic study to evaluate the system's feasibility is conducted. The results showed that the new design achieved a maximum temperature of 179°C in comparison to 134 and 120°C for the mono‐ and bi‐axial orientation without a glass‐covered envelope, respectively. Furthermore, in the new PTC design, the useful daily energy gain increased by 33% and 15%, and the system thermal efficiency increased by 8.9% and 5.8% in summer and winter, respectively, in comparison to the case of mono‐axial orientation without a glass envelope. Besides, the maximum useful energy gain and the instantaneous thermal efficiency in the new design were 22.6 MJ and 73.45%, respectively, in comparison to 17.93 MJ and 67.41% for the mono‐axial orientation without a glass‐covered envelope. The gross payback period of the system was found to be 3.3 years with an NPV of €5257 over the lifetime of the system.

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Two-fluid modeling of direct steam generation in the receiver of parabolic trough solar collector with non-uniform heat flux

Cited by 31 publications

References 28 publications

Multi‐objective assessment of a DAPTC based on 4E analysis: Water‐energy‐environment nexus

Multi‐objective assessment of a DAPTC based on 4E analysis: Water‐energy‐environment nexus

Effect of position of heat flux profile on the absorber surface of parabolic trough solar collector for direct steam generation

Experimental study and performance testing of a novel parabolic trough collector

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