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Experimental Investigation of a Two-Phase Thermosyphon Heat Exchanger


Veröffentlichungsart
Beitrag auf Tagung

Fakultät/Einrichtung
Natur und Technik

Verfasser
Smolen, Slawomir, Prof. Dr.-Ing.

Jahrgang
2009

Name(n), Titel

Weitere Informationen zur Veranstaltung
Fifth Heat Powered Cycles Conference,
Conference Proceedings Published by HPCconference,
Innovationszentrum Energie,
Technische Universität Berlin,

Veranstaltungsort
Berlin

Datum
2009


Experimental Investigation of a Two-Phase Thermosyphon Heat Exchanger
A special design of a two-phase thermosyphon heat exchanger has been proposed. The prototype heat exchanger consists of two horizontal cylindrical vessels connected by two risers and a downcomer. Tube bundles placed in the lower and upper cylinder work as an evaporator and a condenser, respectively. Because the operation of a two-phase thermosyphon is determined first of all by the evaporator performance an experimental investigation has been conducted to examine the influence of the evaporator tube pitch, the initial liquid level above the top tube row and the kind of working fluid on heat flux transferred in a two-phase thermosyphon heat exchanger for an evaporator tube bundle made of smooth and enhanced (corrugated and porous coated) tubes. An experimental investigation was carried out making use of six prototype heat exchangers specially designed for this purpose. As working fluids distilled water, methanol and refrigerant R-141b were utilized. The obtained results indicate better performance of the two-phase thermosyphon heat exchanger with evaporator bundle built of porous coated tubes than corrugated and smooth tubes. It has been observed that the evaporation heat transfer coefficient is strongly influenced by the initial liquid level above the top tube row.

 

 

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