TY - JOUR
T1 - A new type of liquid-suction heat exchanger for automotive air conditioning system
AU - Wang, Yan
AU - Yang, Jianfeng
AU - Zeng, Min
AU - Wang, Qiuwang
PY - 2014/5
Y1 - 2014/5
N2 - Liquid suction heat exchangers are commonly installed in refrigeration system with the intent of ensuring proper system operation and increasing system performance. Previous researchers have investigated performance of liquid suction heat exchangers, and some of them have concluded that the relative capacity change index (RCI) will increase with the increasing of heat recovery efficiency for certain refrigerants. In this study, two kinds of liquid suction exchangers set up with different baffles are numerical simulated by ANSYS FLUENT using the refrigerant R404A. They are used in an automotive air conditioning system and almost have the same geometrical parameters. The results indicated that for the same mass flow rate the overall heat transfer rate and average heat transfer coefficient of the shell-and-tube heat exchanger with continuous helical baffles (CH-STHX) are higher than that of the shell-and-tube heat exchanger (STHX) by 32.2% and 41.7%. The shell-side average heat transfer coefficient of the liquid refrigerant in the CH-STHX is about 3.5 times higher than that of the STHX. As the price of heat transfer enhancement, the shell-side pressure drop of the CH-STHX is extremely increasing to 11 times larger than that of the STHX. While the tube-side heat transfer coefficient and pressure drop of the CH-STHX almost keep the same with that of the STHX. And most importantly, the heat recovery efficiency increases from 0.21 to 0.29 for the CH-STHX, by 38.1%.
AB - Liquid suction heat exchangers are commonly installed in refrigeration system with the intent of ensuring proper system operation and increasing system performance. Previous researchers have investigated performance of liquid suction heat exchangers, and some of them have concluded that the relative capacity change index (RCI) will increase with the increasing of heat recovery efficiency for certain refrigerants. In this study, two kinds of liquid suction exchangers set up with different baffles are numerical simulated by ANSYS FLUENT using the refrigerant R404A. They are used in an automotive air conditioning system and almost have the same geometrical parameters. The results indicated that for the same mass flow rate the overall heat transfer rate and average heat transfer coefficient of the shell-and-tube heat exchanger with continuous helical baffles (CH-STHX) are higher than that of the shell-and-tube heat exchanger (STHX) by 32.2% and 41.7%. The shell-side average heat transfer coefficient of the liquid refrigerant in the CH-STHX is about 3.5 times higher than that of the STHX. As the price of heat transfer enhancement, the shell-side pressure drop of the CH-STHX is extremely increasing to 11 times larger than that of the STHX. While the tube-side heat transfer coefficient and pressure drop of the CH-STHX almost keep the same with that of the STHX. And most importantly, the heat recovery efficiency increases from 0.21 to 0.29 for the CH-STHX, by 38.1%.
KW - Computational fluid dynamics
KW - Continuous helical baffles
KW - Heat transfer enhancement
KW - Liquid-suction heat exchanger
KW - Numerical simulation
KW - Turbulent flow
UR - https://www.scopus.com/pages/publications/84901822615
U2 - 10.3969/j.issn.0438-1157.2014.z1.043
DO - 10.3969/j.issn.0438-1157.2014.z1.043
M3 - 文章
AN - SCOPUS:84901822615
SN - 0438-1157
VL - 65
SP - 264
EP - 271
JO - Huagong Xuebao/Journal of Chemical Industry and Engineering (China)
JF - Huagong Xuebao/Journal of Chemical Industry and Engineering (China)
IS - SUPPL.1
ER -