Comparison of different modeling approaches for minichannel evaporators under dehumidification
| Autor: | Santiago Martínez-Ballester, José Gonzálvez-Maciá, Abdelrahman Hussein Hassan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Fluid Flow and Transfer Processes
Finance business.industry 020209 energy Two-pahse Pressure drop 02 engineering and technology Condensed Matter Physics Modelling Minichannel evaporator 020401 chemical engineering Heat transfer MAQUINAS Y MOTORES TERMICOS 0202 electrical engineering electronic engineering information engineering Christian ministry Business 0204 chemical engineering |
| Zdroj: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname |
| DOI: | 10.1007/s00231-019-02622-0 |
| Popis: | [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. The authors would like to gratefully acknowledge the financial support from the Spanish Ministry of Economy and Finance to project number ENE2014-53311-C2-1-P. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|