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Parametric study of a Novel Hybrid Solar Variable Geometry Ejector cooling with Organic Rankine Cycles

机译：具有有机朗肯循环的新型混合晒太阳可变几何喷射器冷却的参数研究

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摘要

The effect of ejector area variation to account for the unsteadiness of the driving low-grade solar energy source on the cycle performance of a combined variable geometry solar ejector cooling Organic Rankine Cycle under different operating conditions was studied. An Organic Rankine Cycle was combined with the ejector cooling cycle to utilize the excess solar heat in peak hours and to generate power. Simulation and modeling of the system were conducted using the Engineering Equation Solver and Ebsilon Software. Conservation principles and laws of mass and energy transfer were applied to all components of the system and a one-dimensional thermodynamic model was used to model the ejector. It was found that the effect of the ejector area ratio and evaporator pressure were more predominate on the cycle performance than that of the generator pressure. An improvement of 78% of the system coefficient of performance compared to the standard ejector cooling cycle could be achieved using the Variable Geometry Ejector. In addition, further enhancement in the system coefficient of performance could be achieved by regulating the generator and evaporator pressures. The Organic Rankine Cycle efficiency was found to be 5.8% with a total system efficiency of 11.35%. The system cooling capacity was improved by 81% compared to the standard ejector cooling cycle. The proposed system was found economically feasible in countries, where the electricity price is higher than 15 c$/kWh.
机译：喷射器面积的变化，以考虑的晃动上组合的可变几何形状喷射器太阳能不同操作条件下冷却有机朗肯循环的循环性能的驱动低档太阳能电源的效果进行了研究。将有机朗肯循环与喷射器冷却循环组合以在高峰时段利用过量的太阳能热量并产生功率。使用工程方程求解器和EBSILON软件进行系统的仿真和建模。将质量和能量转移的保护原理和规律应用于系统的所有组分，用一维热力学模型用于模拟喷射器。结果发现，喷射器面积比和蒸发器压力的效果比发电机压力的循环性能更偏向。与标准喷射器冷却循环相比的78％的系统性能系数的改善可以使用可变几何喷射器实现。此外，通过调节发电机和蒸发器压力，可以实现系统性能系数的进一步增强。发现有机朗肯循环效率为5.8％，总系统效率为11.35％。与标准喷射器冷却循环相比，系统冷却能力提高了81％。在电力价格高于15吨/千瓦时，拟议的系统被发现经济上可行。

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