Resumen
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 °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 °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.
Idioma original | Inglés |
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Páginas (desde-hasta) | 4914-4922 |
Número de páginas | 9 |
Publicación | International Journal of Heat and Mass Transfer |
Volumen | 55 |
N.º | 17-18 |
DOI | |
Estado | Publicada - ago. 2012 |