Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 55, Issue 17-18, Pages 4914-4922Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2012.04.061
Keywords
Ammonia-lithium nitrate solution; Subcooled boiling; Saturated boiling; Heat transfer; Fusion plate heat exchanger; Plate generator; Absorption chillers
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Funding
- Spanish Ministry of Education and Science Research [ENE2009-11097, ENE2005-08255-C02-02]
- National Board of Science and Technology
- Instituto Politecnico Nacional of Mexico
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This paper presents the experimental heat transfer evaluation during subcooled and saturated boiling of ammonia-lithium nitrate solution in a fusion plate heat exchanger, acting as a vapor generator under operating conditions representative of single-effect absorption machines. The solution flow rate and outlet temperature were modified in the ranges of 0.041-0.083 kg/s and 78-97 degrees C, respectively. The region where vapor bubbles begin to arise is estimated using a correlation for the wall superheat required for the onset of nucleate boiling. Results show that subcooled boiling is present in the generator. The initial boiling temperature is about 3.1 degrees C lower than the saturation temperature. The influence of the heat and mass fluxes on the boiling heat transfer coefficient is analyzed. The paper offers a correlation for the Nusselt number, including the subcooled and saturated boiling regions. (C) 2012 Elsevier Ltd. All rights reserved.
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