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Title: Optimization of a compact falling-droplet absorber for cooling power generation
Authors: Cola, Fabrizio
Romagnoli, Alessandro
Heng Kiat, Jonathan Hey
Keywords: Refrigeration
DRNTU::Engineering::Mechanical engineering
Issue Date: 2017
Source: Cola, F., Romagnoli, A., & Heng Kiat, J. H. (2017). Optimization of a compact falling-droplet absorber for cooling power generation. Energy Procedia, 143, 354-360. doi:10.1016/j.egypro.2017.12.696
Series/Report no.: Energy Procedia
Abstract: Refrigeration has become a necessary component for comfort living. Absorption refrigeration is a valid option for waste-heat-to cool conversion. Coupling this technology with cheap heat energy sources is an interesting prospect, however downsizing of this type or chiller for small environments has been proven difficult, especially regarding the absorber. Large interface area between the two operating fluids returns higher absorption rates, but lack of control on the fluid distribution results in an inefficient use of the space available. This study proposes a space-efficient design based on finned-plate technology coupled with a droplet flow regime. Manufacturing through 3D printing technique is used to study the effect of fins shape. Droplet behaviour is firstly studied with an analytical model based on the variational approach. Experimental results were obtained using a high speed camera employed to validate the analytical results and obtain qualitative and quantitative data to complete the analysis. The results show that the analytical model reproduces with sufficient accuracy the droplet dynamics in some regions. The rhomboidal geometry with 120° angle proved able to produce the smallest droplets without allowing merging of more droplets, ensuring the maintenance of droplet flow. Disturbances in the droplet profiles were observed, caused by the pin-droplet interaction. Further study is required to refine the model (to account for these disturbances) and obtain a more precise prediction of the droplet sizes.
ISSN: 1876-6102
DOI: 10.1016/j.egypro.2017.12.696
Schools: School of Mechanical and Aerospace Engineering 
Rights: © 2017 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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