基于采用分液冷凝有机闪蒸循环分液干度分析及优化

Analysis and optimization of liquid-separation dryness based on liquid-separation condensation organic flash cycle

中文关键词: 分液冷凝 有机闪蒸循环 换热面积 进口干度 分液干度

英文关键词: liquid-separation condensation  organic flash cycle  heat exchange area  inlet dryness  liquid-separation dryness

中文摘要:

      分液冷凝是一种新兴的强化传热方法，可以显著提高冷凝换热系数。将分液冷凝应用于有机闪蒸循环（OFC），采用R227ea、R236ea、R245fa、R600、R601、R600a、R601a、R1234ze和R1234yf为循环工质，分别研究了进口干度、分液干度、冷却水温升和质流密度对冷凝器换热面积的影响。研究结果表明：当进口干度较大时，换热面积会随着分液干度的增大而先减小后增大；当分液干度较小时，分液干度越接近进口干度换热面积越小。采用分液冷凝后的冷凝器换热面积相对不分液时减少13.2%~55.3%，且相对减少量随着进口干度的增大而减小。

英文摘要:

      Liquid-separation condensation is a new method to enhance heat transfer, which can significantly improve the condensation heat transfer coefficient. In this paper, liquid-separation condensation was applied to organic flash cycle (OFC), R227ea, R236ea, R245fa, R600, R601, R600a, R601a, R1234ze and R1234yf where used as working fluids. The effects of inlet dryness, liquid-separation dryness, temperature rise of cooling water and mass flow density on heat transfer area were studied respectively. The results show that the heat transfer area will first decrease and then increase with the increase of the liquid-separation dryness when the inlet dryness is large. When the liquid-separation dryness is small, the closer the liquid-separation dryness is to the inlet dryness, the smaller the heat transfer area will be. The heat transfer area of the condenser after liquid-separation condensation is reduced by 13.2% to 55.3% relatively compared with that without liquid-separation, and the relative reduction decreases with the increase of inlet dryness.