Get your tubes wet: capillary-assisted thin-film evaporation of water for adsorption chillers
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Date
2018Type
- Conference Paper
ETH Bibliography
no
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Abstract
The power density of water based adsorption chillers can be increased by thin-film evaporators. Thin-film evaporation is efficient, as it requires only low superheats. Here, the thin film is maintained by capillary action on copper tubes. We experimentally determine the overall heat transfer at evaporator temperatures of 10, 15 and 20°C with varied driving force at all filling levels. Our experiments show that good tubes remain fully wetted even at high driving force. Furthermore, we show that high porosity, surface extension and roughness promote the creation of a thin film and increase the heat transfer UA-value of the investigated
tubes up to a factor of 10. Show more
Publication status
publishedBook title
Proceedings of the Heat Powered Cycles Conference 2018Pages / Article No.
Publisher
Heat Powered CyclesEvent
Subject
Capillary action; Copper coating; Overall heat transfer coefficient; TubeOrganisational unit
09696 - Bardow, André / Bardow, André
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ETH Bibliography
no
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