CO_2跨临界热泵系统的优化与实验研究Optimization and Experimental Study on Transcritical CO_2 Heat Pump System
杨俊兰;马一太;冯刚;李敏霞;
摘要(Abstract):
为了提高CO2跨临界循环的性能,对系统每个部件以及整个系统的优化研究是非常必要的。因此提出了以基于系统的优化目标函数对CO2换热器的结构敏感性进行优化计算,分析了优化目标函数COPm随气体冷却器和蒸发器管径和管长的变化。计算结果表明,CO2跨临界循环系统应选择小管径和长管长。同时对优化后的新系统进行了模拟计算,其COP和制冷量分别比原系统提高了15%和18%。根据优化结果以及原有系统存在的问题,对换热器及相关部件进行了设计加工,进而建立了新的CO2跨临界水水热泵实验系统。结果显示,新系统的COP和制冷量提高了30%左右。总之,实验测试数据验证了模拟计算结果的正确性,所得结果有助于对CO2跨临界水-水热泵系统进行改善。
关键词(KeyWords): CO2;跨临界循环;优化;实验研究
基金项目(Foundation): 国家自然科学基金项目(50506019);; 天津市高等学校科技发展基金项目(20071116)
作者(Author): 杨俊兰;马一太;冯刚;李敏霞;
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