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- W2313443382 abstract "Flexible two-phase thermosyphons are devices that can transfer large amounts of heat flux with the boiling and condensation of the working fluid resulting from small temperature differences. A flexible two-phase thermosyphon consists of the evaporators with metal with foams, an insulation unit, and the condensers with internal fins and external plate fins. The working fluid inside the evaporator with metal foam is evaporated by the heating of the evaporator in the lower part of the flexible two-phase thermosyphon and the evaporated steam rises to the condenser with with internal fins and external plate fins in the upper part to transfer heat in response to the cooling fluid outside the tube. The resultant condensed working fluid flows downward along the inside surface of the tube due to gravity. These processes form a cycle. In the present study, a flexible two-phase thermosyphon heat exchanger which is 480mm wide, 68mm long, and 1,000mm high was used. The heat transfer pipes in the heat exchanger were 15mm in diameter and 1,000mm in length and 98 heat transfer pipes were installed in the heat exchanger. The inside of the condenser was composed of heat transfer pipes installed with with internal fins and external plate fins to increase the heat transfer surface area of the heating media in the heat transfer pipes and low fin shapes were engraved with rolling to increase the heat transfer surface area for the fluid inside the cylinder. Using refrigerant R134a as a working fluid for the loop type flexible two-phase thermosyphon heat exchanger to conduct heat transfer performance experiments for changes in the temperature of the cooling air outside the condenser and changes in the mass flow rate. According to the results of the present experiments, as the spaces between internal discontinuous pins decreased, pressure drops increased. Changes in the temperatures at the outlet of the condenser were shown to be a little smaller. Therefore, it can be seen that as the spaces between internal discontinuous pins decreased, the heat transfer performance increased. As the temperature of the air flowing in the condenser with internal fins and external plate fins increased, the condensation heat transfer rate of the thermosyphon heat exchanger increased. As the condenser refrigerant inflow temperature increased, the condensation heat transfer rate of the condensers with internal fins and external plate fins of the thermosyphon heat exchanger increased." @default.
- W2313443382 created "2016-06-24" @default.
- W2313443382 creator A5033444661 @default.
- W2313443382 date "2015-12-19" @default.
- W2313443382 modified "2023-09-23" @default.
- W2313443382 title "A Study on the Condensation Heat Transfer Performance of Condensers with Internal Fins and External Plate Fins of Loop Type Two Phase Thermosyphon Heatexchangers" @default.
- W2313443382 cites W1976215972 @default.
- W2313443382 cites W2243588585 @default.
- W2313443382 doi "https://doi.org/10.14257/astl.2015.120.140" @default.
- W2313443382 hasPublicationYear "2015" @default.
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