| Summary: | 碩士 === 國立虎尾科技大學 === 創意工程與精密科技研究所在職專班 === 99 === Air Cooled Heat Exchangers(A.C.H.E) cool down hot process fluid by using forced fans that drive air flowing through finned tube bundles . By controlling air flow one can adjusts outlet process fluid temperature to meet the process requirement.
The A.C.H.Es fan’s performance are unstable in my factory , so that reduce production capacity of process . In my study starts from measure air flow volumes and air pressure during fans work , and compare with the original design , then I find that due to different operating environment , resulting in air flow , air pressure difference.
By change one more powerful fan motor and increase the fan blade attack angle , can upgrade the air flow volumes 9.93% ( from 197440 ft3/min to 216980 ft3/min ), and the A.C.H.E efficacy upgrade from 75.5% to 80% .After increase air flow volumes of the fan , also , this study uses ANSYS(a finite element software)to simulate the fan element behaviors before and after improvement in order to take into account design innovation and stability.
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