为了探索不借助外力即可实现跨临界CO_(2)冷热联供系统循环中工质过冷的方法,本文提出了三种采用系统循环内部工质分流实现过冷的跨临界CO_(2)循环系统形式,建立了系统循环热力学模型,通过模拟计算分析不同工况下系统性能变化规律。结...为了探索不借助外力即可实现跨临界CO_(2)冷热联供系统循环中工质过冷的方法,本文提出了三种采用系统循环内部工质分流实现过冷的跨临界CO_(2)循环系统形式,建立了系统循环热力学模型,通过模拟计算分析不同工况下系统性能变化规律。结果表明:在蒸发器与节流阀间分流的系统方案不会提高系统的性能;在气体冷却器与过冷器间分流的系统方案与在过冷器与节流阀间分流的系统方案对系统性能提升的效果相同,相对于在蒸发器与节流阀间分流的系统方案,综合循环性能系数(coefficient of performance,COP)最大可提高17.62%;采用分流过冷会提高压缩机的吸气压力,当气体冷却器出口CO_(2)温度确定时,存在最佳的排气压力使综合COP最高。因此,采用合理的分流过冷循环系统可以使跨临界CO_(2)冷热联供系统仅依靠自身循环实现过冷并提升系统性能。展开更多
A comparison on subcritical and transcritical organic Rankine cycle（ORC） system with a heat source of 110 ℃ geothermal water was presented. The net power output, thermal and exergy efficiencies and the products of ...A comparison on subcritical and transcritical organic Rankine cycle（ORC） system with a heat source of 110 ℃ geothermal water was presented. The net power output, thermal and exergy efficiencies and the products of the heat transfer coefficient（U） and the total heat exchange area（A）（UA values） were calculated for parametric optimization. Nine candidate working fluids were investigated and compared. Under the given conditions, transcritical systems have higher net power outputs than subcritical ones. The highest net power output of transcritical systems is 18.63 k W obtained by R218, and that of subcritical systems is 13.57 k W obtained by R600 a. Moreover, with the increase of evaporating pressure, the thermal and exergy efficiencies of transcritical systems increase at first and then decrease, but the efficiencies of subcritical ones increase. As a result, the efficiencies of transcritical systems cannot always outperform those of the subcritical ones. However, the subcritical systems have lower minimum UA values and lower expansion ratios than the transcritical ones at the maximum net power output. In addition, the transcritical cycles have higher expansion ratios than the subcritical ones at their maximum net power output.展开更多
文摘为了探索不借助外力即可实现跨临界CO_(2)冷热联供系统循环中工质过冷的方法,本文提出了三种采用系统循环内部工质分流实现过冷的跨临界CO_(2)循环系统形式,建立了系统循环热力学模型,通过模拟计算分析不同工况下系统性能变化规律。结果表明:在蒸发器与节流阀间分流的系统方案不会提高系统的性能;在气体冷却器与过冷器间分流的系统方案与在过冷器与节流阀间分流的系统方案对系统性能提升的效果相同,相对于在蒸发器与节流阀间分流的系统方案,综合循环性能系数(coefficient of performance,COP)最大可提高17.62%;采用分流过冷会提高压缩机的吸气压力,当气体冷却器出口CO_(2)温度确定时,存在最佳的排气压力使综合COP最高。因此,采用合理的分流过冷循环系统可以使跨临界CO_(2)冷热联供系统仅依靠自身循环实现过冷并提升系统性能。
基金Project(2012AA053001) supported by the National High Technology Research and Development Program of China
文摘A comparison on subcritical and transcritical organic Rankine cycle（ORC） system with a heat source of 110 ℃ geothermal water was presented. The net power output, thermal and exergy efficiencies and the products of the heat transfer coefficient（U） and the total heat exchange area（A）（UA values） were calculated for parametric optimization. Nine candidate working fluids were investigated and compared. Under the given conditions, transcritical systems have higher net power outputs than subcritical ones. The highest net power output of transcritical systems is 18.63 k W obtained by R218, and that of subcritical systems is 13.57 k W obtained by R600 a. Moreover, with the increase of evaporating pressure, the thermal and exergy efficiencies of transcritical systems increase at first and then decrease, but the efficiencies of subcritical ones increase. As a result, the efficiencies of transcritical systems cannot always outperform those of the subcritical ones. However, the subcritical systems have lower minimum UA values and lower expansion ratios than the transcritical ones at the maximum net power output. In addition, the transcritical cycles have higher expansion ratios than the subcritical ones at their maximum net power output.
