ShareSummary
A model for heat and mass transfer in a coiled tube ammonia-water absorber has been developed. The film thickness and the velocity distribution of the liquid film were obtained by solving the momentum equation for the infinitesimal control volume. The finite volume method with upwind scheme was used to solve the 2-D diffusion and energy equations in the liquid film. A modified Colburn-Drew analysis was used in the vapour phase to determine the heat and mass fluxes at the liquid-vapour interface. The local heat and mass transfer characteristics show different trends because of the different variations of temperature, concentration and pressure of the vapour and liquid film when the vapour flows parallel or counter to the liquid flow. For the conditions considered in the study, water in the liquid film is desorbed near the top of the absorber in counterflow reducing the overall absorber performance.
Details
- Original title: Numerical study of falling-film heat and mass transfer in a coiled tube NH3-H2O absorber.
- Record ID : 2007-0168
- Languages: English
- Source: ACRA-2006. Proceedings of the 3rd Asian conference on refrigeration and air conditioning.
- Publication date: 2006/05/21
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Indexing
- Themes: Absorption and adsorption systems
- Keywords: Mass transfer; Helical tube; Heat transfer; Ammonia-water; Absorption system; Modelling; Falling film; Absorber
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- Author(s) : GOMMED K., GROSSMAN G., KOENIG M. S.
- Date : 2001
- Languages : English
- Source: ASHRAE Transactions. 2001 Winter Meeting, Atlanta, GA. Volume 107, part 1 + CD-ROM.
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Numerical results of falling film absorption wi...
- Author(s) : WASSENAAR R. H., SEGAL A.
- Date : 1998/07/06
- Languages : English
- Source: Thermodynamics, heat and mass transfer of refrigeration machines and heat pumps. Proceedings of the EUROTHERM Seminar 59./ Thermodynamique et transferts de chaleur et de masse dans les machines à froid et pompes à chaleur. Comptes rendus du séminaire EUROTHERM 59.
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An experimental study on heat and mass transfer...
- Author(s) : INOUE N., YAMAMOTO M., GOTO M., et al.
- Date : 2006/05/29
- Languages : English
- Source: 7th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2006). Proceedings
- Formats : PDF
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Thermodynamic data in a falling film absorber o...
- Author(s) : ROMERO R. J., BEST R., HERNÁNDEZ J., et al.
- Date : 1999/03/24
- Languages : English
- Source: Proceedings of the International Sorption Heat Pump Conference.
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Experimental and analytical study of inter-tube...
- Author(s) : SULTANA P., WIJEYSUNDERA N.E., HO J. C.
- Date : 2006/05/21
- Languages : English
- Source: ACRA-2006. Proceedings of the 3rd Asian conference on refrigeration and air conditioning.
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