The performance of a transcritical CO2 cycle with an internal heat exchanger for hot water heating
The performance of a transcritical CO2 cycle with an internal heat exchanger for hot water heating
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DOI：
10.1016/j.ijrefrig.2005.03.004
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发表时间：
2005-11
期刊：
影响因子：
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通讯作者：
Sung Goo Kim;Y. Kim;Gilbong Lee;Min-Soo Kim
中科院分区：
文献类型：
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作者：
Sung Goo Kim;Y. Kim;Gilbong Lee;Min-Soo Kim
摘要本研究主要目的在探讨具内部热交换器之跨临界二氧化碳循环热水供暖之效能。通过改变蒸发器和气体冷却器入口二次传热流体温度以及排气压力，对跨临界CO2循环进行了性能测试和模拟。给出了不同工况下制冷剂质量流量、压缩机功率、制热量和性能系数随换热器长度的变化规律。已发现模型预测和实验结果之间的定量协议，大多数参数的绝对平均偏差小于4%。随着内部换热器长度的增加，COP提高，但由于内部换热器中的效率和压降之间的权衡，供热能力趋于下降。
The main purpose of this study is to investigate the performance of a transcritical CO2cycle with an internal heat exchanger for hot water heating. Performance test and simulation have been carried out for a transcritical CO2cycle by varying secondary heat transfer fluid temperatures at evaporator and gas-cooler inlets as well as the discharge pressure. Variations of mass flow rate of refrigerant, compressor power, heating capacity, and co-efficient of performance (COP) with respect to the length of an internal heat exchanger are presented at various operating conditions. Good quantitative agreement between model predictions and experimental results has been found; most parameters have absolute average deviations of less than 4%. As the length of the internal heat exchanger increases, COP is enhanced but heating capacity tends to decrease due to the trade-offs between the effectiveness and pressure drop in the internal heat exchanger.