Performance and economic evaluation of CO2 (R744) air conditioning system driven by compressed air engine
Performance and economic evaluation of CO2 (R744) air conditioning system driven by compressed air engine
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压缩空气发动机驱动的CO2(R744)空调系统性能及经济评价
DOI：
10.1016/j.ijrefrig.2021.12.026
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发表时间：
2022-01
影响因子：
3.9
通讯作者：
ZHANG Xin-Rong
中科院分区：
文献类型：
--
作者：
WANG Lei;ZHU Shi-Liang;ZHANG Xin-Rong
传统的建筑空调使用电能或热能来驱动制冷循环。压缩空气膨胀释放的能量也可用于驱动制冷循环。此外，膨胀后的低温空气也可用于空调系统。本文设计了3种新型往复活塞式压缩空气发动机驱动的CO2空调系统，即EAGC（Exhaust Air for Gas Cooler）、EAS（Exhaust Air for Sub-cooler）和EASC（Exhaust Air for Space Cooling），并结合压缩空气储能技术分析了CO2空调系统的性能和经济性。在中国不同气候区域选取了27个典型城市，对不同电价和室外温度变化下的系统性能和运行成本进行了评估。结果表明，与电驱动CO2空调系统相比，三种系统均能显著提高系统COP（性能系数），但仍达不到传统氟利昂制冷系统的性能水平。但是，在北京、上海等峰谷电价差较大的城市，EASC系统相比电驱动的R410 A空调系统运行费用更低，平均每小时运行费用分别可节省11.96%和16.35%。这意味着采用压缩空气储能技术的CO2空调系统具有一定的经济应用价值，可以在合理的场合推广。这种创新的系统设计有助于解决建筑能源的供需矛盾，实现休闲能源消费，降低需求侧能源消费的经济成本。
Traditional building air conditioning uses electricity or thermal energy to drive the refrigeration cycle. The energy released by the expansion of compressed air can also be used for driving the refrigeration cycle. Moreover, the expanded low-temperature air can be used in the air conditioning system too. In this paper, three forms of CO2air conditioning systems driven by novel reciprocating piston compressed air engines were designed, namely EAGC (Exhaust Air for Gas Cooler), EAS (Exhaust Air for Sub-cooler), and EASC (Exhaust Air for Space Cooling), to analyze the performance and economics of CO2air conditioning systems combined with compressed air energy storage technology. Twenty-seven typical cities were selected in different climate regions in China to evaluate the systems' performance and running cost under outdoor temperature changes and different electricity prices. The results show that compared with the electricity-driven CO2air conditioning system, the three systems can greatly improve the system COP (Coefficient of Performance) but still cannot reach the performance level of the conventional freon refrigeration systems. However, in cities like Beijing and Shanghai with the large peak-to-valley electricity price difference, EASC system compared to the electricity-driven R410A air conditioning system running costs are lower, the average running cost per hour can be saved 11.96% and 16.35%, respectively. This means that the CO2air conditioning system with compressed air energy storage technology has a certain economic application value and can be popularized on reasonable occasions. This innovative system design can help solve the contradiction between supply and demand of building energy, realize leisure energy consumption, and reduce the economic cost of energy consumption on the demand side.
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