| 摘要 |
PROBLEM TO BE SOLVED: To provide a falling film heat exchanger tube on which a stable liquid film can be formed and which is contrived to accelerate heat transfer by increasing its heat transferring area. SOLUTION: This falling film heat exchanger tube is constituted by forming a plurality of rhombic projections 2 in a zigzag grid-like state on the outer peripheral surface of the main body 1 of a heat exchanger tube. When an absorbent liquid diluted with a refrigerant is sprayed upon the main body 1, the liquid flows down along the outer peripheral surface of the main body 1 in the circumferential direction by gravity and flows in grooves formed among the projections 2. At the same time, thin liquid films of the absorbent liquid are formed on the projections 2 by the surface tension of the liquid. Since the liquid films on the projections 2 are thinly formed, the heat transfer between the absorbent liquid and a heating fluid made to flow through the main body 1 is accelerated and the refrigerant contained in the liquid film becomes to evaporate readily. Consequently, the restoration of the concentration of the absorbent liquid is accelerated.
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