Development and validation of a micro-fin tubes evaporator model using R134a and R1234yf as working fluids |
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| Affiliation: | 1. Interdisciplinary Professional Unit of Engineering Campus Guanajuato, National Institute Polytechnic, Av. Mineral de Valenciana 200 Fracc, Industrial Puerto Interior, Silao de la Victoria, Mexico;2. Department of Metal-Mechanical, Technological University of Guanajuato Southwest, Valle-Huanimaro km. 1.2, Valle de Santiago, Gto., Mexico;3. Department of Mechanical Engineering, Engineering Division, Campus Irapuato-Salamanca, University of Guanajuato, Salamanca, Gto., Mexico;4. Department of Mechanical Engineering and Construction, Campus de Riu Sec, University Jaume I, Castellon, Spain;1. University of Padova, Department of Management and Engineering, I-36100 Vicenza, Italy;2. The Catholic University of America, School of Engineering, Washington, DC, USA;1. Dipartimento di Ingegneria Industriale, University of Padova, via Venezia 1, 35131 Padova, Italy;2. Dipartimento di Tecnica e Gestione dei Sistemi Industriale, University of Padova, Stradella San Nicola 3, 36100 Vicenza, Italy |
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| Abstract: | This paper presents a model of shell and tube evaporator with micro-fin tubes using R1234yf and R134a. The model developed for this evaporator uses the ε-NTU method to predict the evaporating pressure, the refrigerant outlet enthalpy and the outlet temperature of the secondary fluid. The model accuracy is evaluated using different two-phase flow boiling correlations for micro-fin tubes and comparing predicted and experimental data. The experimental tests were carried out for a wide range of operating conditions using R134a and R1234yf as working fluids. The predicted parameter with maximum deviations, between the predicted and experimental data, is the evaporating pressure. The correlation of Akhavan– Behabadi et al. was used to predict flow boiling heat transfer, with an error on cooling capacity prediction below 5%. Simulations, carried out with this validated model, show that the overall heat transfer coefficient of R1234yf has a maximum decrease of 10% compared with R134a. |
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| Keywords: | Flow boiling Micro-fin tubes R1234yf R134a Numerical model Ebullition en écoulement Tubes à micro-ailettes R1234yf R134a Modèle numérique |
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