Analysis of the heat transfer area distribution in a frosted plain fin-and-tube geometry
| Autor: | Juan M. Belman-Flores, O.M. Chapa-Contreras, S. Méndez-Díaz, A. Morales-Fuentes |
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| Rok vydání: | 2017 |
| Předmět: |
Pressure drop
Imagination Materials science Flow distribution 020209 energy Mechanical Engineering media_common.quotation_subject Airflow Geometry 02 engineering and technology Building and Construction 021001 nanoscience & nanotechnology Air temperature Heat transfer Heat exchanger 0202 electrical engineering electronic engineering information engineering Relative humidity 0210 nano-technology media_common |
| Zdroj: | International Journal of Refrigeration. 75:26-37 |
| ISSN: | 0140-7007 |
| DOI: | 10.1016/j.ijrefrig.2017.01.016 |
| Popis: | The development of frost is a phenomenon that deteriorates thermohydraulic performance on heat exchangers. In this study, several heat-transfer area distributions on a fin-and-tube geometry are proposed and their performances as frost develops are compared using simulation. The frost development at a specific location is determined using a segment analysis. In each segment, a semiempirical model to predict the frost growth based on air temperature, velocity, relative humidity and surface temperature is applied. The analysis considers airflow redistribution among channels, leading to changes in heat transfer and frosting rates with time. Results show that a geometry that allows even flow distribution along the operation time is less sensitive to thermohydraulic deterioration. An area distribution with larger fin spacing and fin length presents an advantage, particularly on the pressure drop, which allows longer operation time between defrost cycles. |
| Databáze: | OpenAIRE |
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