Comparison of different modeling approaches for minichannel evaporators under dehumidification
[EN] This paper firstly presents a comprehensive minichannel evaporator model (MCHX-1D-MB) based on fin theory coupled with the moving boundary technique along fin height. To validate the presented model, experimental data for R-134a and R-744 (CO2) minichannel evaporators were used. The proposed mo...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2019 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/144584 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/144584 |
| Access Level: | acceso abierto |
| Palabra clave: | Minichannel evaporator Modelling Two-pahse, Pressure drop Heat transfer MAQUINAS Y MOTORES TERMICOS |
| Sumario: | [EN] This paper firstly presents a comprehensive minichannel evaporator model (MCHX-1D-MB) based on fin theory coupled with the moving boundary technique along fin height. To validate the presented model, experimental data for R-134a and R-744 (CO2) minichannel evaporators were used. The proposed model successfully predicted the cooling capacity of R-134a and CO2 evaporators with mean absolute error values of +/- 1.8 and +/- 4.3%, respectively. Regarding the outlet air temperature, the mean absolute errors in the estimated results were +/- 0.43 and +/- 0.9 degrees C for R-134a and CO2 evaporators, respectively. Finally, to evaluate the impact of widely used assumption of cut fin on the air-side performance of minichannel evaporators, another model was developed (MCHX-1D-CF). The comparative study revealed that the most remarkable deviations between the two models appear when the evaporator operates under partially wet conditions, which were up to approximate to 12% in the latent heat transfer rate. |
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