针对太阳能空气压气机结构优化问题进行实验研究,测试并分析压缩空气罐内加装扰流风机之后的加热、冷却特性及太阳能利用率的变化情况。实验结果表明,在风机风速2.0~6.7 m/s的变化范围内,存在一个最佳风速使得太阳能热机效率最高,其冷却系数从0.34~0.44提升至0.78~0.84,压气机在冷却之后的吸气能力也显著提升。以名义太阳能利用率来衡量,风机+肋化吸热管结构相比于不设置风机的肋化吸热管或光滑吸热管结构有大幅提高,提高幅度在10.8%~145.8%之间,风机强化传热效果明显。
Abstract
An experimental study on the structural optimization of solar air compressor is conducted. The heating and cooling characteristics as well as the changes of solar energy utilization rate after installing a disturbing fan in the compressed air tank are tested and analyzed. The experimental results show that in the range of speed 2.0-6.7 m/s, there exists an optimal speed, which makes the solar thermal engine have the highest efficiency. Its cooling coefficient increases from 0.34-0.44 to 0.78-0.84, and the absorbent capacity of the compressor after cooling also increases significantly. According to the nominal solar energy utilization rate, compared with the ribbed heat-absorbing tube or smooth heat-absorbing tube without blower, the combined structure of blower and ribbed heat-absorbing tube has a great improvement. The improvement range is between 10.8% and 145.8%. Besides, the heat transfer enhancement effect of blower is obvious.
关键词
太阳能 /
压气机 /
强化传热 /
热效率
Key words
solar energy /
compressor /
heat transfer enhancement /
thermal efficiency
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基金
国家重点基础研究发展（973）计划（2015CB251303）
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