图书馆订阅: Guest
Begell Digital Portal Begell 数字图书馆 电子图书 期刊 参考文献及会议录 研究收集
强化传热期刊
影响因子: 0.562 5年影响因子: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v11.i4.40
pages 275-282

Condensation Heat Transfer and Pressure Drop of R22 in 5-mm Diameter Microfin Tubes

Xiaomin Wu
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, P. R. China
Xiaoliang Wang
Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
Weicheng Wang
Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, P. R. China

ABSTRACT

Condensation heat transfer coefficients and pressure drops of R22 in two microfin tubes with 5-mm outside diameter (OD) and a smooth tube with 5.4-mm OD were experimentally investigated. The main difference in geometries of the two microfin tubes was the helix angle: one had a helix angle of 7°, and the other had a helix angle of 18°. The test section had a length of 3.0 m and was divided into five subsections to achieve the local heat transfer coefficient. The condensation tests were carried out at 45 °C condensation temperature for 200−500 kg/m2s refrigerant mass fluxes with 5−30 °C inlet superheat degrees and 2−3 °C outlet subcooling degrees. The effects of helix angle and mass flux on the heat transfer coefficients and pressure drop are presented and discussed.


Articles with similar content:

REFRIGERANT VAPOUR CONDENSATION ON A HORIZONTAL TUBE BUNDLE
International Heat Transfer Conference 9, Vol.3, 1990, issue
Luisa Rossetto, Giovanni Antonio Longo, Alberto Cavallini
HEAT TRANSFER AND PRESSURE DROP DURING EVAPORATION AND CONDENSATION OF R134a INSIDE TWO MICROFIN TUBES OF NEW DESIGN
International Heat Transfer Conference 13, Vol.0, 2006, issue
Alfonso Niro, Andrea Lucchini, Luigi Pietro Maria Colombo, Adriano Muzzio
PRESSURE DROP DURING CONDENSATION IN SMOOTH TUBES WITH A HELICAL WIRE INSERT
International Heat Transfer Conference 13, Vol.0, 2006, issue
Josua Petrus Meyer, Leon Liebenberg, Tianfu Ji Ji
HEAT TRANSFER AND PRESSURE DROP DURING FLOW BOILING OF R134a AND R404A IN A MICROFIN TUBE AT LOW MASS FLUXES
International Heat Transfer Conference 13, Vol.0, 2006, issue
Hans Mueller-Steinhagen, Klaus K. Spindler
PRESSURE DROP IN R-245FA CONDENSATION IN TUBES FITTED WITH COILED-WIRE INSERTS
Journal of Enhanced Heat Transfer, Vol.21, 2014, issue 6
AJIT KHATUA, Hari Narayan Singh, Parmanand Kumar