Experimental and techno-economic analysis of transcritical CO2 heat pump water heater with fin-and-tube and microchannel heat exchanger

Wang, Yikai; Zong, Shuo; Song, Yulong; Cao, Feng; He, Ya‐Ling; Gao, Qiang

doi:10.1016/j.applthermaleng.2021.117606

Cited by 41 publications

(5 citation statements)

References 36 publications

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“…用，Pettersen 等 [40] 提出了 CO2"平行流"或"微通道"式气体冷却器的概念。其结构图如图 9(a)所示，由集液管、多孔扁管以及扁管间的折叠翅片构成，其中通道的尺寸越小，单位体积的传热面积越大，传热系数越高。Wang 等 [41] 人发现微通道式换热器比传统的翅片管式换热器更适合跨临界 CO2…”

Section: 然而，大量经验关联式的方法仍然无法解决普遍性问题。为了精确地控制最优压力，许多学者unclassified

跨临界二氧化碳热泵研究进展与应用综述

梅申功,

刘中毅,

刘夏

2023

Journal of Clean Energy Science and Technology

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热泵技术是一种能够高效利用低品位能源的节能技术，在建筑供暖、工业余热利用、新能源等领域具有广阔的应用前景。然而，传统的热泵系统使用的制冷剂对环境有着严重的负面影响，亟需寻找一种安全、环保、高效的替代制冷剂。CO2作为一种天然制冷剂，具有良好的物理和化学特性，且非常适合作为跨临界循环的工质，在热泵技术领域显示出了巨大的优势。目前对CO2热泵的研究已经取得了一定的进展，但关于CO2热泵在不同应用场合的研究现状和发展趋势的综述较少，因此，本文系统地总结了跨临界CO2热泵在不同应用领域的最新研究成果，指出其在系统设计和运行过程中存在的压力较高，运行效率低等困难，并总结出最新的系统部件、循环结构、混合制冷剂和控制策略几方面的优化研究，结果表明了各优化方式对系统性能都有明显的提升，其中混合制冷剂是最简单的优化方式。最后，对CO2热泵技术提出展望，随着政策的扶持和技术的进步，更全面、节能和智能的CO2热泵技术将持续地发展和创新。

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Section: 然而，大量经验关联式的方法仍然无法解决普遍性问题。为了精确地控制最优压力，许多学者unclassified

跨临界二氧化碳热泵研究进展与应用综述

梅申功,

刘中毅,

刘夏

2023

Journal of Clean Energy Science and Technology

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“…The smaller the size of the channel, the larger the heat transfer area per unit volume and the higher the heat transfer coefficient. Wang et al [41] found that microchannel heat exchangers are more suitable for transcritical CO2 heat pumps than traditional finned tube heat exchangers. They not only have better performance, but are also more energy-saving, environmentally friendly, and cost-effective.…”

Section: Heat Exchangementioning

confidence: 99%

Research progress and applications of transcritical carbon dioxide heat pumps: A review

Mei,

Liu,

Liu

2023

Clean Energ. Sci. Tech.

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Heat pump technology is an energy-saving technology that can efficiently utilize low-grade energy. It has broad application prospects in building heating, industrial waste heat utilization, new energy and other fields. However, the refrigerants used in traditional heat pump systems have serious negative impacts on the environment, and there is an urgent need to find a safe, environmentally friendly, and efficient alternative refrigerant. As a natural refrigerant, CO2 has good physical and chemical properties and is very suitable as a working fluid in transcritical cycles, showing great advantages in the field of heat pump technology. At present, research on CO2 heat pumps has made certain progress, but there are few reviews of the research status and development trends of CO2 heat pumps in different applications. Therefore, this article systematically summarizes the latest research results of transcritical CO2 heat pumps in different application fields, pointing out the difficulties such as high pressure and low operating efficiency in system design and operation. It also summarizes the latest optimization research on system components, cycle structure, mixed refrigerants and control strategies. The results show that each optimization method can significantly improve system performance, among which mixed refrigerant is the simplest optimization method. Finally, the outlook for CO2 heat pump technology is put forward. With policy support and technological advancement, more comprehensive, energy-saving, and intelligent CO2 heat pump technology will continue to develop and innovate.

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“…Therefore, the heat pump's working conditions are limited. For these reasons, many efforts have been made to improve various aspects of the heating Energies 2023, 16, 5889 2 of 19 performance [6][7][8][9][10][11]. Chiriboga et al [12] and Lim et al [13] proposed a geothermal-source heat pump that aimed to produce a heating temperature of 50-70 • C. Their technique was based on the fact that the available heat source temperature is quite high; hence, the compression pressure ratio of the compressor (PR comp ) is decreased, which results in lower electricity consumption and a lower compressor discharge temperature.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Improvement Potential of a Heat Pump Equipped with a Two-Phase Ejector

2023

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In this paper, an experimental investigation of the performance improvement of a heat pump equipped with a two-phase ejector, called an “ejector–expansion heat pump (EEHP)”, is proposed. The system performance of the EEHP is compared with that of a vapor-compression heat pump (VCHP). The improvement potential is determined and discussed. The heat pump test system based on a water-to-water heat pump that can experiment with both the EEHP and the VCHP is constructed. A two-phase ejector with a cooling load of up to 2500 W is installed for the experiment. The results show that the EEHP always produces a higher heating rate and COPHP than the VCHP under the specified working conditions. The heating COPHP is increased by 5.7–11.6% depending on the working conditions. It is also found that, under the same heat sink and heat source temperature, the EEHP can produce a lower compressor discharge temperature and a lower compressor pressure ratio than the VCHP. This is evidence that the two-phase ejector can provide the compressor with better working characteristics, which yields a longer compressor lifetime. It is demonstrated that the expansion pressure ratio is key to the performance of the EEHP. A larger expansion pressure ratio yields greater improvement potential when compared with the VCHP.

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Experimental and techno-economic analysis of transcritical CO2 heat pump water heater with fin-and-tube and microchannel heat exchanger

Cited by 41 publications

References 36 publications

跨临界二氧化碳热泵研究进展与应用综述

跨临界二氧化碳热泵研究进展与应用综述

Research progress and applications of transcritical carbon dioxide heat pumps: A review

Experimental Investigation of the Improvement Potential of a Heat Pump Equipped with a Two-Phase Ejector

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