Ammonia Condensation Experiments at Oak Ridge National Laboratory

摘要

During the past year, work in ocean thermal energy conversion (OTEC) centered around the examination of heat transfer enhancement obtained for ammonia condensing on the outside of four aluminum tubes of three distinct types. These include a smooth tube, a single (external) fluted tube, and two double (internal/external) fluted tubes. Composite heat transfer coefficients (coefficients that include vapor-side plus wall resistance) are reported for a smooth tube condensing horizontally and at various tilt angles, and for a single-fluted tube condensing vertically. Overall heat transfer data are given for both double-fluted tubes. Various comparisons are made between the fluted tubes tested in this study and other tubes tested in earlier studies. Finally, a comparison is made with condenser tube bundle data obtained by Argonne National Laboratory. (ERA citation 81:025313)