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Experimental analysis on a novel solar collector system achieved by supercritical CO_2 natural convection

机译：超临界CO_2自然对流实现新型太阳能集热系统的实验分析

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摘要

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 CO_2 natural 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 CO_2 pipe flow with Reynolds number higher than 6700 is found. The CO_2 fluid temperature in the heat exchanger can be as high as 80 ℃ and a stable supply of hot water above 45 ℃ 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.
机译：太阳能收集器已经成为科学研究和工程应用中的热门话题。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，并已成为一个有前途的领域。本研究涉及通过超临界CO_2自然循环实现的新型太阳能热转换和热水器系统。在中国东南部的浙江省（大约N 30.0°，E 120.6°）建立并测试了实验系统。当前的系统设计为在超临界区域运行，因此可以紧凑地制造该系统，并实现平稳的高速率自然对流。在测试过程中，发现雷诺数高于6700的超临界CO_2管道流量。换热器中的CO_2流体温度可以高达80℃，并且可以在45℃以上稳定地供应热水。在季节性测试中，通常可获得高于60.0％的相对较高的收集器效率。利用实验数据进行热和性能分析。本文还对本系统与以前的太阳能热水器进行了比较。

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  • 来源
    《Energy Conversion & Management》 |2014年第1期|173-182|共10页
  • 作者

    Lin Chen; Xin-Rong Zhang;

  • 作者单位

    Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100877, China;

    Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing 100877, China,Beijing Key Laboratory for Solid Waste Utilization and Management, Peking University, Beijing 100871, China;

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

    Solar collector; Supercritical fluid; Natural convection; System efficiency; Carbon dioxide;

    机译：太阳能集热器;超临界流体自然对流;系统效率;二氧化碳;

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