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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Numerical investigation of the natural convective heat loss of a solar central cavity receiver with air curtain
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Numerical investigation of the natural convective heat loss of a solar central cavity receiver with air curtain

机译：空气幕上的太阳中心腔接收机的自然对流热损失的数值研究

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摘要

Central receiver in a solar tower power system absorbs the solar energy and transfers heat to the working fluid. It is of great importance to reduce the heat losses of the receiver. In the present work, a plane air nozzle was installed on top of a solar cavity receiver in order to create an air curtain. The effects of air curtain on the natural convection of the cavity receiver were numerically analyzed. Four parameters of the air nozzle, including the inclination (theta(noz)) the width (L-noz), the outlet temperature (T-o, (noz)) and the outlet velocity (u(o), (noz)), were considered as the factors. The results indicate that the air curtain could effectively prevent the hot air from flowing out of the cavity. It can enlarge the stagnation zone inside the cavity and suppress the natural convection on the internal surfaces. The convective heat loss monotonically decreases with increasing theta(noz). The downward facing (theta(noz) = 90 degrees) air nozzle produced the highest drop in the convective heat loss. A reduction of 28.6% can be achieved when a downward facing nozzle with 600 mm in width is used. The optimal u(o), (noz) decreases with increasing L-noz.
机译：太阳能塔电力系统中的中央接收器吸收太阳能并将热量转移到工作流体。减少接收器的热量损耗是非常重要的。在本作工作中，将平面空气喷嘴安装在太阳能腔接收器的顶部，以便产生空气幕。气帘对腔接收机自然对流的影响在数值上分析。空气喷嘴的四个参数，包括倾斜度（θ（noz））宽度（L-NOZ），出口温度（至（NOZ））和出口速度（U（O），（NOZ））是被认为是因素。结果表明，空气幕可以有效地防止热空气流出腔。它可以扩大腔内的停滞区域，并抑制内表面上的自然对流。随着θ（NOZ）的增加，对流热损失单调减少。向下面向（θ（noz）= 90度）气体喷嘴在对流热损失中产生了最高下降。当使用具有600mm的宽度的向下的面对喷嘴时，可以实现28.6％的减少。随着L-NOZ的增加，最佳U（O），（NOZ）减小。

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