Use of Artificial Neural Networks for Prediction of Convective Heat Transfer in Evaporative Units
Convective heat transfer prediction of evaporative processes is more compli- cated than the heat transfer prediction of single-phase convective processes. This is due to the fact that physical phenomena involved in evaporative pro- cesses are very complex and vary with the vapor quality that increas...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2014 |
| País: | México |
| Institución: | Universidad Autónoma de San Luis Potosí |
| Repositorio: | Redalyc-UASLP |
| OAI Identifier: | oai:redalyc.org:40429649009 |
| Acceso en línea: | https://www.redalyc.org/articulo.oa?id=40429649009 |
| Access Level: | acceso abierto |
| Palabra clave: | Ingeniería artificial neural network thermal system heat transfer evaporative processes |
| Sumario: | Convective heat transfer prediction of evaporative processes is more compli- cated than the heat transfer prediction of single-phase convective processes. This is due to the fact that physical phenomena involved in evaporative pro- cesses are very complex and vary with the vapor quality that increases gradu- ally as more fluid is evaporated. Power-law correlations used for prediction of evaporative convection have proved little accuracy when used in practical cases. In this investigation, neural-network-based models have been used as a tool for prediction of the thermal performance of evaporative units. For this purpose, experimental data were obtained in a facility that includes a counter-flow con- centric pipes heat exchanger with R134a refrigerant flowing inside the circular section and temperature controlled warm water moving through the annular section. This work also included the construction of an inverse Rankine refrig- eration cycle that was equipped with measurement devices, sensors and a data acquisition system to collect the experimental measurements under different operating conditions. Part of the data were used to train several neural-network configurations. The best neural-network model was then used for prediction purposes and the results obtained were compared with experimental data not used for training purposes. The results obtained in this investigation reveal the convenience of using artificial neural networks as accurate predictive tools for determining convective heat transfer rates of evaporative processes. |
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