Experimental analysis on a novel solar collector system achieved by supercritical CO2 natural convection
Experimental analysis on a novel solar collector system achieved by supercritical CO2 natural convection
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DOI：
10.1016/j.enconman.2013.08.059
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发表时间：
2014
影响因子：
10.4
通讯作者：
Lin Chen;Xin‐Rong Zhang
中科院分区：
文献类型：
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作者：
Lin Chen;Xin‐Rong Zhang
太阳能集热器已成为科学研究和工程应用的热点。在各种应用中，热水供应需求占社会能源消耗的很大一部分，已成为一个很有前途的领域。研究了一种新型的超临界CO2自然循环太阳能热转换热水系统。在中国东南部的浙江省（约N30.0 °，E120.6 °）建立了实验系统并进行了测试。本系统设计为在超临界区操作，因此系统可以被紧凑地制造并实现平稳的高速自然对流。试验中发现，超临界CO2管流雷诺数大于6700，换热器内CO2流体温度可达80 °C，并能稳定供应45 °C以上的热水。在季节性试验中，获得了较高的集热效率，一般在60.0%以上。结合实验数据进行了热分析和性能分析。本文还将本系统与以往的太阳能热水器进行了比较。
Solar collector has become a hot topic both in scientific research and engineering applications. Among the various applications, the hot water supply demand accounts for a large part of social energy consumption and has become one promising field. The present study deals with a novel solar thermal conversion and water heater system achieved by supercritical CO2natural circulation. Experimental systems are established and tested in Zhejiang Province (around N 30.0°, E 120.6°) of southeast China. The current system is designed to operate in the supercritical region, thus the system can be compactly made and achieve smooth high rate natural convective flow. During the tests, supercritical CO2pipe flow with Reynolds number higher than 6700 is found. The CO2fluid temperature in the heat exchanger can be as high as 80 °C and a stable supply of hot water above 45 °C is achieved. In the seasonal tests, relative high collector efficiency generally above 60.0% is obtained. Thermal and performance analysis is carried out with the experiment data. Comparisons between the present system and previous solar water heaters are also made in this paper.