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

机译：具有非均匀热通量的抛物面槽太阳能收集器接收机直接蒸汽发电的两种流体建模

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In this study, the thermo-hydrodynamics of direct steam generation in the receiver of parabolic trough solar collector have been investigated using a two-fluid modeling approach. The numerical models for solving the conservation equations, turbulence parameters, phase change, boiling heat transfer, and heat loss from the receiver have been discussed in detail. The three-dimensional governing equations are solved for 12 m length of the parabolic trough solar collector using ANSYS Fluent 2020R1. The receiver is modeled with and without considering the glass envelop. The thermal-hydraulics of the direct steam generation process is studied at solar noontime and 2 h before and after solar noon with direct normal irradiance (DNI) of 750 W/m2. Further, the effect of inlet mass flow rates and operating pressures have been investigated. The simulations are performed for mass flow rates 0.3 kg/s to 0.6 kg/s and operating pressure 30 bar–100 bar. The simulation results have shown that the vapor volume fraction at the absorber outlet varies in the range of 0.30–0.58 without considering the heat losses. The absorber's outer surface temperature reached the maximum temperature of 526.5 K, 568.1 K, and 603.4 K, respectively for operating pressures 30 bar, 60 bar, and 100 bar at solar noon. The maximum circumferential temperature difference is observed 16 K during the solar noon. The increments in mixture velocity from inlet to outlet are observed as 0.76 m/s, 0.41 m/s, and 0.26 m/s, respectively for operating pressure 30, 60, and 90 bar at the solar noon. The relative velocity between the liquid and vapor phase have been predicted. The higher pressure drops are observed at the lower operating pressures. The average heat loss from the receiver is observed as 95 W/m2 for operating pressure 30 bar and MFRs 0.3 kg/s to 0.6 kg/s and the absorber surface temperature varies between 506 K and 525 K. Further the comparison of thermal-hydraulic parameters with and without considering the glass envelop is presented. The comparison of thermal-hydraulic parameters for solar heat flux corresponding to solar noon and 2 h before and after the solar noon are presented.
机译：在该研究中，使用双流体建模方法研究了抛物线槽太阳能收集器的接收器中的直接蒸汽发生的热流体动力学。已经详细讨论了求解保护方程，湍流参数，相变，沸腾传热和从接收器的热损失的数值模型。使用ANSYS流畅的2020R1，解决了三维控制方程的12米长的抛物面槽太阳能收集器。接收器采用和不考虑玻璃包围的建模。直接蒸汽发电过程的热液压在太阳能中午和2小时内和太阳中午之前和2小时，直接正常辐照度（DNI）为750W / m 2。此外，研究了入口质量流量和操作压力的效果。对质量流量的模拟0.3kg / s至0.6kg / s和操作压力30 bar-100ab。模拟结果表明，在不考虑热损失的情况下，吸收器出口处的蒸汽体积分数在0.30-0.58的范围内变化。吸收器的外表面温度分别达到526.5 k，568.1k和603.4 k的最高温度，用于操作压力30 bar，60 bar，以及在太阳日中午100巴。在太阳中午16 k观察到最大周向温度差。从入口到出口的混合速度的增量分别观察为0.76m / s，0.41m / s和0.26 m / s，用于在太阳日中的工作压力30,60和90巴。已经预测了液体和气相之间的相对速度。在较低的操作压力下观察到较高的压降。从接收器的平均热损失为65W / m 2，用于操作压力30巴，MFRS 0.3kg / s至0.6kg / s，吸收器表面温度在506k和525k之间变化。进一步比较热液压提出了具有和不考虑玻璃包封的参数。介绍了对应于太阳中午和太阳中午2小时的太阳能热通量的热液压参数的比较。

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