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首页> 外文期刊>Energy Conversion & Management >Multi-mode analysis and comparison of four different carbon dioxide-based combined cooling and power cycles for the distributed energy system
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Multi-mode analysis and comparison of four different carbon dioxide-based combined cooling and power cycles for the distributed energy system

机译：多模分析与分布式能源系统四种不同二氧化碳组合冷却和功率循环的比较

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摘要

To meet the diversified demand of power and cooling for the distributed energy system, this paper proposes two combined cooling and power (CCP) systems combining the supercritical carbon dioxide cycles with a carbon dioxide ejector refrigeration cycle, which can switch between full power mode (Mode-P), combined cooling and power mode (Mode-PR), and full refrigeration mode (Mode-R) according to the energy demands of users. In the proposed CCP systems, the recompression cycle and modified dual-stage compression cycle are used to replace the regenerative cycle and basic dual-stage compression cycle in two reference systems respectively. The mathematical models of systems are established and verified. Detailed parametric analysis is conducted to investigate the effects of key parameters on the performances of proposed systems and reference systems. Moreover, the modified systems and reference systems are optimized and compared at three modes. Multi-mode analysis is also applied to study the ability of the four CCP systems to convert power into cooling. Finally, detailed exergy analysis and thermoeconomic analysis are performed for the optimal system. The results show that the modified systems can achieve higher exergy efficiency by recovering partial waste heat before the precooler. Under the refrigeration condition (the evaporation temperature is 0 degrees C), the exergy efficiencies of the modified single-stage compression (M-S) system are 13.71% and 14.08% higher than those of the reference system at Mode-P and Mode-R, respectively. The cooling capacities of the systems at Mode-PR and Mode-R are positively correlated with their power outputs at Mode-P. The M-S system has the best multi-mode performance owing to its highest exergy efficiency (64.01%) at Mode-P, minimal energy loss at Mode-PR, and the maximum cooling capacity to heat input ratio (1.714 at 0 degrees C and 0.964 at -20 degrees C) at Mode-R. Under the freezing condition (the evaporation temperature is -20 degrees C), the single-stage compression systems generally perform better than the dual-stage compression systems. During the process of switching from Mode-P to Mode-R, the total product unit cost of the M-S system increases from 12.24 $.GJ(-1) to 44.74 $.GJ(-1) under the refrigeration condition and from 12.24 $.GJ(-1) to 38.15 $.GJ(-1) under the freezing condition.
机译：为了满足分布式能源系统的电力和冷却的多样化需求，本文提出了两个组合的冷却和功率（CCP）系统，将超临界二氧化碳循环与二氧化碳喷射器制冷循环相结合，可以在全电源模式（模式）之间切换-P），组合冷却和电源模式（MODE-PR），以及根据用户的能量需求的完整制冷模式（MODE-R）。在所提出的CCP系统中，补充循环和改进的双级压缩循环用于分别在两个参考系统中替换再生周期和基本的双级压缩循环。系统的数学模型是建立和验证的。进行详细的参数分析以研究关键参数对所提出的系统和参考系统的性能的影响。此外，修改的系统和参考系统经过三种模式进行了优化。多模式分析也应用于研究四种CCP系统将功率转换为冷却的能力。最后，对最佳系统进行了详细的Deervent分析和热经济分析。结果表明，通过在预冷却器之前恢复部分废热，改进的系统可以实现更高的效率。在制冷条件下（蒸发温度为0℃），改性单级压缩（MS）系统的漏效率高于Mode-P和Mode-R的参考系统的13.71％和14.08％，分别。 MODE-PR和MODE-R在MODE-PR和MODE-R时的冷却能力与MODE-P处的功率输出正相关。由于其在MODE-P处的最高电位效率（64.01％），MODE-PR的最小能量损失以及热量输入比的最大冷却能力（1.714，0摄氏度为0.964，MS系统具有最佳的多模式性能。在-20℃）在mode-r。在冷冻条件下（蒸发温度为-20℃），单级压缩系统通常比双级压缩系统更好地执行。在从MODE-P切换到MODE-R过程中，MS系统的总产品单位成本从制冷条件下的12.24 $ .gj（-1）到44.74 $ .gj（-1）增加到4.24 $在冻结条件下，GJ（-1）至38.15美元$ .gj（-1）。

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  • 来源
    《Energy Conversion & Management》 |2021年第9期|114476.1-114476.19|共19页
  • 作者

    Yuan Jiajia; Wu Chuang; Xu Xiaoxiao; Liu Chao;

  • 作者单位

    Chongqing Univ Sch Energy & Power Engn Key Lab Low Grade Energy Utilizat Technol & Syst Minist Educ Chongqing 400044 Peoples R China;

    Chongqing Univ Sch Energy & Power Engn Key Lab Low Grade Energy Utilizat Technol & Syst Minist Educ Chongqing 400044 Peoples R China;

    Chongqing Univ Sch Energy & Power Engn Key Lab Low Grade Energy Utilizat Technol & Syst Minist Educ Chongqing 400044 Peoples R China;

    Chongqing Univ Sch Energy & Power Engn Key Lab Low Grade Energy Utilizat Technol & Syst Minist Educ Chongqing 400044 Peoples R 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

    Combined cooling and power system; Supercritical carbon dioxide cycle; Ejector refrigeration cycle; Multi-mode; Distributed energy system;

    机译：组合冷却电力系统;超临界二氧化碳循环;喷射器制冷循环;多模;分布式能量系统;

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