Investigation of the Impact Factors on the Optimal Intermediate Temperature in a Dual Transcritical CO2 System with a Dedicated Transcritical CO2 Subcooler
Investigation of the Impact Factors on the Optimal Intermediate Temperature in a Dual Transcritical CO2 System with a Dedicated Transcritical CO2 Subcooler
复制标题
具有专用跨临界CO2过冷器的双跨临界CO2系统最佳中间温度影响因素的研究
DOI：
10.3390/en13020309
复制
发表时间：
2020-01
期刊：
影响因子：
3.2
通讯作者：
Yulong Song;Haidan Wang;F. Cao
中科院分区：
文献类型：
--
作者：
Yulong Song;Haidan Wang;F. Cao
CO2作为一种具有上级环保优势的天然流体，被用来构成双跨临界系统，以减少在高出口温度下的性能恶化。针对系统结构、改进潜力和优化问题，对该系统进行了深入分析，并建立了相应的耦合模型。首先，通过与以前的测量结果进行比较，完全验证了仿真模型的准确性。然后，最佳中间温度的存在被验证，而最佳值被发现随着环境温度和供水温度的增加而增加。此外，夹点对气体冷却器内的传热的负面影响，可以大大减少通过使用双气体冷却器。最后，提出了以环境温度和给水温度为自变量的最佳中间温度确定的预测关联式，为该系统在工业化过程中实现高效控制提供了理论依据。
As a natural fluid with superior environment advantages, CO 2 is used to constitute a dual transcritical system to reduce performance deterioration under high gas-cooler outlet temperature. Aiming at the system configuration, improvement potential, and optimization, the proposed system is deeply analyzed, and corresponding coupling models are presented in detail. First, the veracity of simulation models is completely verified by comparing with previous measurements. Then, the existence of the optimal intermediate temperature is validated, while the optimal values are found to increase with the augmentation in ambient and water-feed temperatures. Moreover, the negative effects of the pinch point on the heat transfer inside the gas cooler could be greatly reduced by using the dual gas cooler. Finally, a predictive correlation for optimal intermediate temperature determination with ambient and water-feed temperature as independent variables is proposed, which provides a theoretical basis for the proposed system to realize efficient control in the industrialization process.