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Combined heat loss analysis of solar parabolic dish - modified cavity receiver for superheated steam generation

机译：太阳能抛物面抛物面修正腔接收器过热蒸汽的组合热损失分析。

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摘要

In this article, a 3-D numerical modeling is carried out to determine combined convection and surface radiation heat losses from a modified cavity receiver of parabolic dish collector used as mono-tube boiler for sub-cooled, saturated and superheated steam generation conditions. The forced convection heat loss from the modified cavity receiver is estimated using Nusselt number correlation developed for the modified cavity receiver. The effect of receiver inclination (beta), operating temperature (T-w), emissivity of the cavity cover (epsilon), thickness of insulation (t(ins)) on the combined heat losses from the modified cavity receiver is investigated. The boundary conditions for wall temperature and insulation thicknesses are chosen to match the three steam generation conditions. It is found that the natural convection heat losses are higher at beta = 0 degrees (receiver facing sideward) and lower at beta = 90 degrees (receiver facing down) whereas the forced convection heat loss is higher at beta = 90 degrees and lower at beta = 0 degrees. The variation of radiation heat losses is marginal for all values of beta and vary with T-w. The effect of various parameters such as receiver inclination, wind direction (phi), wind speed and diameter ratios on forced convection heat loss from the receiver has also been studied. The forced convection heat loss at lower wind speeds (<2.5 m/s) is lower than the natural convection heat losses. The maximum heat losses occur at side-on wind direction (phi = 0) followed by head-on wind directions (phi = 30 90 degrees) and back-on wind directions (phi = -90 degrees to -30 degrees). The heat losses vary with diameter ratios for different configurations of the receiver. The forced convection heat loss is 1.2-9 times higher than natural convection heat loss for diameter ratio (ratio of cavity diameter to aperture diameter, d/D) = 0.4 at 5 m/s and receiver inclinations varying from 0 degrees to 90 degrees. Nusselt number correlations have been proposed based on the numerical analysis to estimate the combined convective and radiative heat loss. The present study attempts to estimate natural convection, forced convection and surface radiation heat losses from the modified cavity receiver under various conditions. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在本文中，进行了3​​-D数值建模，以确定抛物面集热器的改进型腔体接收器的对流和表面辐射的综合热损失，该接收器用作过冷，饱和和过热蒸汽产生条件的单管锅炉。使用为改进型腔体接收器开发的Nusselt数相关性估算改进型腔体接收器的强制对流热损失。研究了接收器倾斜度（β），工作温度（T-w），腔体盖的发射率（ε），绝缘厚度（t（ins））对改进型腔体接收器的综合热损失的影响。选择壁温和绝缘厚度的边界条件以匹配三种蒸汽产生条件。发现自然对流热损失在β= 0度时较高（接收器朝向侧面），在β= 90度时（接收器朝下）较低，而强制对流热损失在β= 90度时较高，而在β时较低= 0度。辐射热损失的变化对于所有β值都是很小的，并且随T-w变化。还研究了各种参数（例如接收器的倾斜度，风向（phi），风速和直径比）对接收器强制对流热损失的影响。在较低风速（<2.5 m / s）下的强制对流热损失低于自然对流热损失。最大热量损失发生在侧向风向（phi = 0），然后是正面风向（phi = 30 90度）和反向风向（phi = -90度至-30度）。对于接收器的不同配置，热损失随直径比而变化。在5 m / s和接收器倾斜度从0度到90度变化的情况下，直径比（腔直径与孔径直径的比，d / D）= 0.4时，强制对流热损失比自然对流热损失高1.2-9倍。已经基于数值分析提出了Nusselt数相关性，以估计对流和辐射热损失的总和。本研究试图估计各种条件下改进型腔体接收器的自然对流，强制对流和表面辐射热损失。 （C）2015 Elsevier Ltd.保留所有权利。

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  • 来源
    《Solar Energy》 |2015年第11期|78-93|共16页
  • 作者

    Reddy K. S.; Vikram T. Srihari; Veershetty G.;

  • 作者单位

    Indian Inst Technol Madras, Dept Mech Engn, Heat Transfer & Thermal Power Lab, Madras 600036, Tamil Nadu, India;

    Indian Inst Technol Madras, Dept Mech Engn, Heat Transfer & Thermal Power Lab, Madras 600036, Tamil Nadu, India;

    Indian Inst Technol Madras, Dept Mech Engn, Heat Transfer & Thermal Power Lab, Madras 600036, Tamil Nadu, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Solar parabolic dish; Modified cavity receiver; Combined convection and radiation heat losses; Numerical modeling;

    机译：太阳抛物面碟;改进的腔体接收器;对流和辐射相结合的热损失;数值模拟;

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