FLOW BOILING OF REFRIGERANT R134a INSIDE A MICROFIN TUBE: EXPERIMENTAL TESTS AND PREDICTION

摘要：

This paper reports the heat transfer coefficients measured during vaporisation of refrigerant R134a inside a microfin tube. This same tube was already tested during condensation of R134a. The experimental runs are carried out at 30 ℃ saturation temperature, with mass velocity ranging from 200 to 600 kg m-2 s-1 and heat flux from 42 to 86 kW m-2. The present data covers a vapour quality range between 0.08 and 0.93. The effects of vapour quality, mass velocity and heat flux on the heat transfer coefficient are investigated. The experimental data is compared to the condensation tests carried out on the same tube. This data is also compared to the prediction obtained by Cavallini et al. 1 model.

作者: A.CAVALLINI D.DEL COL A.PADOVAN L.ROSSETTO

作者单位: Dipartimento di Fisica Tecnica, University of Padova, Via Venezia 1 35313 Padova, Italy

会议类型: 国际会议

会议名称: The 22nd International Congress of Refrigeration(第22届国际制冷大会)

会议地点: 北京

会议语种:英文

在线出版日期: 2007-08-21（万方平台首次上网日期，不代表论文的发表时间）