本文在传统的复叠式空气源热泵中增加一个双螺旋盘管形式的蓄热器,并测量蓄热器内不同位置水温及蓄热器进出口制冷剂温度变化。研究了当室内侧模拟工况干球温度为22℃±0.1℃,相对湿度为50%±3%,室外侧模拟工况干球温度为-12℃&...本文在传统的复叠式空气源热泵中增加一个双螺旋盘管形式的蓄热器,并测量蓄热器内不同位置水温及蓄热器进出口制冷剂温度变化。研究了当室内侧模拟工况干球温度为22℃±0.1℃,相对湿度为50%±3%,室外侧模拟工况干球温度为-12℃±0.1℃时,蓄热器在蓄热模式、间断制热蓄能除霜模式、不间断制热蓄能除霜模式下的蓄放热特性。结果表明:该蓄热器有良好的蓄热能力及在不同低位热源条件下的放热能力。在间断和不间断制热蓄能除霜过程中,蓄热器的释热量分别为1 642.7 k J和1 892.4 k J,可以满足除霜的要求和部分室内供热需求。展开更多
为高效合理地利用液化天然气(LNG)动力船上LNG气化释放的冷能,本文以某超大型油船为例,构建了一种发电与制冷相结合的冷能梯级利用系统。本文以甲烷和乙烷的混合物(质量比为50︰50)为发电工质、以R410A和R134a分别为冷库工质和空调工质...为高效合理地利用液化天然气(LNG)动力船上LNG气化释放的冷能,本文以某超大型油船为例,构建了一种发电与制冷相结合的冷能梯级利用系统。本文以甲烷和乙烷的混合物(质量比为50︰50)为发电工质、以R410A和R134a分别为冷库工质和空调工质,设计了该系统的工艺参数,对该系统进行热力性能计算。结果表明,LNG作为船舶动力燃料时,其冷量梯级回收方案可行。在满足船舶制冷需求的基础上,利用Rankine发电循环可回收约102.6 k W电量,LNG梯级利用系统的冷?效率为54.43%。展开更多
A new cleaner power generation system(IPGS) is proposed and investigated in this paper. Integrating combined cycle with supercritical water gasification of coal, the thermodynamic energy of the produced syngas is casc...A new cleaner power generation system(IPGS) is proposed and investigated in this paper. Integrating combined cycle with supercritical water gasification of coal, the thermodynamic energy of the produced syngas is cascade utilized according to its temperature and pressure, both sensible and latent heat of the syngas can be recycled into the system, and thereby the net power efficiency can be about 6.4 percentage points higher than that of the traditional GE gasification based power plant(GEPP). The exergy analysis results show that the exergy efficiency of the proposed system reaches 52.45%, which is 13.94% higher than that of the GEPP, and the improvement in exergy efficiency of the proposed system mainly comes from the exergy destruction decline in the syngas energy recovery process, the condensation process and the syngas purification process. The syngas combustion process is the highest exergy destruction process with a value of 157.84 MW in the proposed system. Further performance improvement of the proposed system lies in the utilization process of syngas. Furthermore, system operation parameters have been examined on the coal mass fraction in the supercritical water gasifier(GF), the gasification temperature, and the gasification pressure. The parametric analysis shows that changes in coal concentration in the GF exert more influence on the exergy efficiency of the system compared with the other two parameters.展开更多
文摘本文在传统的复叠式空气源热泵中增加一个双螺旋盘管形式的蓄热器,并测量蓄热器内不同位置水温及蓄热器进出口制冷剂温度变化。研究了当室内侧模拟工况干球温度为22℃±0.1℃,相对湿度为50%±3%,室外侧模拟工况干球温度为-12℃±0.1℃时,蓄热器在蓄热模式、间断制热蓄能除霜模式、不间断制热蓄能除霜模式下的蓄放热特性。结果表明:该蓄热器有良好的蓄热能力及在不同低位热源条件下的放热能力。在间断和不间断制热蓄能除霜过程中,蓄热器的释热量分别为1 642.7 k J和1 892.4 k J,可以满足除霜的要求和部分室内供热需求。
文摘为高效合理地利用液化天然气(LNG)动力船上LNG气化释放的冷能,本文以某超大型油船为例,构建了一种发电与制冷相结合的冷能梯级利用系统。本文以甲烷和乙烷的混合物(质量比为50︰50)为发电工质、以R410A和R134a分别为冷库工质和空调工质,设计了该系统的工艺参数,对该系统进行热力性能计算。结果表明,LNG作为船舶动力燃料时,其冷量梯级回收方案可行。在满足船舶制冷需求的基础上,利用Rankine发电循环可回收约102.6 k W电量,LNG梯级利用系统的冷?效率为54.43%。
基金the financial support of the National Key Research and Development Program of China(Grant No.2016YFB0600105)。
文摘A new cleaner power generation system(IPGS) is proposed and investigated in this paper. Integrating combined cycle with supercritical water gasification of coal, the thermodynamic energy of the produced syngas is cascade utilized according to its temperature and pressure, both sensible and latent heat of the syngas can be recycled into the system, and thereby the net power efficiency can be about 6.4 percentage points higher than that of the traditional GE gasification based power plant(GEPP). The exergy analysis results show that the exergy efficiency of the proposed system reaches 52.45%, which is 13.94% higher than that of the GEPP, and the improvement in exergy efficiency of the proposed system mainly comes from the exergy destruction decline in the syngas energy recovery process, the condensation process and the syngas purification process. The syngas combustion process is the highest exergy destruction process with a value of 157.84 MW in the proposed system. Further performance improvement of the proposed system lies in the utilization process of syngas. Furthermore, system operation parameters have been examined on the coal mass fraction in the supercritical water gasifier(GF), the gasification temperature, and the gasification pressure. The parametric analysis shows that changes in coal concentration in the GF exert more influence on the exergy efficiency of the system compared with the other two parameters.
