Cooling heat transfer attributions of supercritical CO2 in a spiral groove tube casing heat exchanger: A numerical investigation

IF 1.6 4区工程技术 Q3 ENGINEERING, MECHANICAL

Journal of Thermal Science and Engineering Applications Pub Date : 2024-06-12 DOI:10.1115/1.4065720

Dong Wang, Sensen Deng, Yinshuang Tao, Tiancheng Jiang, Mengxue Li, Yuehong Lu

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引用次数: 0

Abstract

To improve the performance of the CO2 heat pump water heater, the spiral groove tube casing heat exchanger is used as a gas cooler. At present, the flow mode of supercritical CO2 (SCO2) flows between inner and outer tube channels is mainly adopted. However, the efficiency of the gas cooler was studied rarely when the SCO2 flows in the inner tube channel (ITC). So, the heat transfer of SCO2 in the two flow channels are studied and compared in this paper. A physical model of the cooling heat transfer of SCO2 is established for the spiral groove tube casing. The impact of SCO2 pressure, the mass flow ratios of SCO2 and water on the heat transfer attributions of SCO2 in the tube are analyzed using numerical simulation. The outcomes designate that the flow channel in the exchanger can affect the heat transfer attributions of SCO2. When the mass flow ratio of SCO2 becomes lower, the average heat transfer coefficient (h) of SCO2 flowing between inner and outer tube channels is higher, with about 2.09%. As the mass flow ratio of SCO2 rises, the average h of SCO2 flowing in an ITC is higher, with about 3.90%. Moreover, both the safety of the system operation and the heat transfer attributions of the functioning medium should be considered, the flow mode of SCO2 flows in the ITC is recommended.

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超临界二氧化碳在螺旋槽管套管式热交换器中的冷却传热属性：数值研究

为了提高二氧化碳热泵热水器的性能，螺旋槽管套管热交换器被用作气体冷却器。目前，主要采用超临界二氧化碳（SCO2）在内、外管通道之间流动的模式。然而，很少有人研究过 SCO2 在内部管通道（ITC）流动时气体冷却器的效率。因此，本文对 SCO2 在两个流道中的传热情况进行了研究和比较。本文建立了螺旋槽管壳中 SCO2 冷却传热的物理模型。通过数值模拟分析了 SCO2 压力、SCO2 和水的质量流量比对管内 SCO2 传热属性的影响。结果表明，交换器中的流道会影响 SCO2 的传热属性。当 SCO2 的质量流量比变小时，流经内外管通道的 SCO2 的平均传热系数（h）较高，约为 2.09%。随着 SCO2 质量流量比的升高，流经 ITC 的 SCO2 的平均热传导系数（h）也随之升高，约为 3.90%。此外，考虑到系统运行的安全性和功能介质的传热属性，建议采用 SCO2 在 ITC 中的流动模式。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Thermal Science and Engineering Applications THERMODYNAMICSENGINEERING, MECHANICAL -ENGINEERING, MECHANICAL

CiteScore

3.60

自引率

9.50%

发文量

120

期刊介绍： Applications in: Aerospace systems; Gas turbines; Biotechnology; Defense systems; Electronic and photonic equipment; Energy systems; Manufacturing; Refrigeration and air conditioning; Homeland security systems; Micro- and nanoscale devices; Petrochemical processing; Medical systems; Energy efficiency; Sustainability; Solar systems; Combustion systems