Actions for OTEC performance tests of the Carnegie-Mellon University vertical fluted-tube evaporator [electronic resource].

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OTEC performance tests of the Carnegie-Mellon University vertical fluted-tube evaporator [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1979.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: 33 : digital, PDF file
Additional Creators
Argonne National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
Performance tests were conducted with the Carnegie-Mellon University (C-MU) vertical fluted-tube evaporator. Under nominal operating conditions (3200 gpm water flow, 3.2 million Btu/hr heat duty, and 100 gpm ammonia feed rate), the overall heat transfer coefficient (U/sub 0/) was 825 Btu/hr ft/sup 2/ /sup 0/F and the ammonia-side and water-side heat transfer coefficients were 1800 and 2610 Btu/hr ft/sup 2/ /sup 0/F, respectively. The water-side pressure drop was 3.2 psi. Tests were conducted at heat duties ranging from 2.4 million to 4.0 million Btu/hr and ammonia feed rates from 30 to 110 gpm. Over these ranges, U/sub 0/ increased with ammonia feed rate and decreased with heat duty. For all runs the quality of the ammonia vapor leaving the evaporator exceeded 99.9%. The measured U/sub 0/ values were very stable and repeatable for any continuous run at fixed operating conditions; however, they were not always repeatable following operating state changes or shutdown of the ammonia feed. These repeatability problems were attributed to variations in tube wetting and to the poor design of the ammonia applicator. Test results suggested that to ensure sufficient wetting and good thermal performance, the system should be started with a high ammonia feed rate and then cut back to the desired operating value.
Report Numbers
E 1.99:anl/otec-ps-5
anl/otec-ps-5
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
07/01/1979.
"anl/otec-ps-5"
Lorenz, J J; Yung, D T; Hillis, D L; Sather, N F.
Funding Information
W-31-109-ENG-38
View MARC record | catkey: 14798820