Heat Transfer Performance Of The Chiller’s Two Heat Exchangers With Sp Low-finned Tubes

Energy is material resources which provide a variety of capabilities and power for production and life of human, and is also the important material foundation for developing a country’s economy and improving people’s living qualities. The development and effective utilization of energy, and the per capita energy consumption have become a measure of a country’s production technology and an important indicator of people’s quality of life. Chiller as an important part of the traditional central air conditioning systems, it has been occupying the dominant position in industry, especially in the size of the market area, holding the main share. Using the efficient longitudinal flow heat exchanger with SP low-finned tube to substitute the traditional baffle plate heat exchanger in Chillers, can reduce the shell-side flow resistance and heat transfer’s dead zone, and can make full use of the heat transfer area, to improve the energy efficiency and reduce the energy consumption.Through the experimental test of the chiller which composed with efficient longitudinal flow heat exchanger with SP low-finned tube, the paper analysis the heat transfer coefficient and flow resistance performance of the flooded evaporator and condenser with SP low-finned tube, and fit the corresponding standards relationship. Then compare its performance with the traditional baffle heat exchangers. The paper also use VB6.0programming language software, combined with group members researches of the SP tube heat exchanger, to develop a SP low-finned tube heat exchanger design software. It not only can save computing time, improve design accuracy, but also provide a valuable experience for subsequent software development.SP low-finned tube is a kind of composite enhanced tube together with fins and twisted. Through the analysis and comparison of the SP tube’s performance with the ordinary pipe find that the heat transfer performance of SP low-finned tube can be improved by21.3%, and its self-supporting institutions can greatly reduce the shell side pressure drop. With same Cooling capacity, the use of SP low-finned tube heat exchanger can decrease the overall consumption of20%. It is a great improvement in the level of energy utilization.