Flow boiling heat transfer of R134a and low GWP refrigerants in a horizontal micro-scale channel

Autor(es)

Sempertegui-Tapia, Daniel Felipe ; Ribatski, Gherhardt

• Tipo de documento: Artigo Científico
• Fonte: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER; v. 108, p. 16-pg., 2017-05-01.

Resumo

The present paper presents an investigation of the effects of the refrigerant type on the heat transfer coefficient during flow boiling inside micro-scale channels. Experimental results for R134a, R1234ze(E), R1234yf and R600a for flow boiling in a circular channel with internal diameter of 1.1 mm are presented. The experimental database comprises 3409 data points covering mass velocities ranging from 200 to 800 kg/m(2) s, heat fluxes from 15 to 145 kW/m(2), saturation temperatures of 31 and 41 degrees C, and vapor qualities from 0.05 to 0.95. The experimental data were parametrically analysed and the effects of the experimental parameters (heat flux, mass velocity, saturation temperature and working fluid) identified. Subsequently, the experimental data were compared against the most quoted predictive methods from literature, including macro and micro-scale methods. Based on the broad database obtained in the present study, an updated version of the predictive method of Kanizawa et al. (2016) was proposed. The updated version provided accurate predictions of the present experimental database, predicting more than 97% and 86% of the results within error bands of 30 and 20%, respectively. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 10/17605-4 - Análise experimental do efeito da geometria do micro canal no padrão de escoamento, coeficiente de transferência de calor e perda de pressão durante a ebulição convectiva
• Beneficiário: Daniel Felipe Sempértegui Tapia
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/50176-2 - Mitigação da emissão de gases de efeito estufa em sistemas de refrigeração mediante a utilização de gases com baixo GWP e a aplicação de micro e nanotecnologias
• Beneficiário: Gherhardt Ribatski
• Modalidade de apoio: Auxílio à Pesquisa - Programa de Pesquisa sobre Mudanças Climáticas Globais - Regular