수산해양교육연구 (Journal of Fisheries and Marine Sciences Education)
- 제5권1호
- /
- Pages.31-44
- /
- 1993
- /
- 1229-8999(pISSN)
- /
- 2288-2049(eISSN)
터보 냉동기용 핀튜브에 관한 연구 ( I ) - 응축 열전달에 관하여 -
A Study on Finned Tube Used in Turbo Refrigerator( I ) -for Condensation Hear Transfer-
- Cho, Dong-Hyun (Graduate School, National Fisheries University of Pusan) ;
- Han, Kyu-Il (National Fisheries University of Pusan) ;
- Kim, Si-Young (National Fisheries University of Pusan)
- 발행 : 1993.08.31
초록
Through the early 1900's, the evolution of the surface condenser was closely tied to the development of steam engine and the turbine. As the chemical and petroleum industries evolved in the 1900's, the use of surface condensers in many different processes. Today, industry uses condensers in many shapes and sizes. The actual condensation process occurs on the outside surface of tubes. The nature of this surface geometry affects the condenser's heat transfer performance. The first condensers were built with plain tubes. As tube manufacturing techniques advanced, manufacturers started making tubes with integral fins. In the 1940's, fin densities were limited to about 600 to 700 fins per meter(fpm) because of manufacturing procedure. Today new manufacturing techniques allow production of tubes with fin densities ranging from 750 to 1600 fpm. The integral-fin tubes investigated in this paper are nominally 19 mm diameter. Eight tubes have been used with trapezodially shaped integral-fins having fin density from 748 to 1654 fpm and 10, 30 grooves. For comparison, tests are made using a plain tube having the same inside diameter and an outside diameter equal to that at the root of the fins for the finned tubes. Betty and Katz's theoretical modelis is used to predict the R-11 condensation coefficient on horizontal integral-fin tubes having 748, 1024 and 1299 fpm. Experiments are carried out using R-11 as working fluid. The refrigerant condensates at a saturation state of
키워드