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<p>The U.S. Navy is constantly looking toward using more lightweight and compact heat exchangers. One of the areas of interest is the use of enhanced boiler tubes in the evaporator of a refrigerator plant, thereby cutting down on the number of tubes needed. The present research is a continuation of work done at NPS concentrating on the boiling characteristics from small tube bundles sitting in a pool of pure R-114, simulating the evaporator in such a heat exchanger. Two types of commercially available enhanced boiler tubes were used, namely High Flux and Turbo-B. In addition, the effect of adding up to 6% of oil to the R-114 (simulating typical amounts found in a real evaporator) during Turbo-B tube experiments was studied to see how much the heat transfer performance of the tubes decreased. All tests were conducted at 2.2 C corresponding to typical working pressures in a Navy evaporator. The results using pure R-114 indicated that the heat transfer performance for both types of tube were similar and outperformed smooth and finned tube bundles by a factor of up to 5 and 3 respectively. The effectiveness of the Turbo-B tube bundle degraded with increased amounts of oil.
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<br>Subjects: Mechanical engineering; Heat; Transmission; Thermodynamics.; Heat Transfer; Pool Boiling</div>
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Eraydin, Hakan</div>
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