Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

FLOW CONDENSATION HEAT TRANSFER CHARACTERISTICS OF METHANE AND ETHANE

Get access (open in a dialog) DOI: 10.1615/IHTC16.cod.022811
pages 2369-2376

Abstrakt

Hydrocarbons, with zero ozone depleting potential, low global warming potential and high thermodynamic performance, are good alternative refrigerants in refrigerators and heat pump systems. Methane (R50) and ethane (R170) are the important components of Mixture Joule-Thomson Refrigeration cycle (MJTR) and the dominated components of natural gas. Accurate knowledge of the condensation heat transfer of R50 and R170 is necessary for the nature gas liquefaction technology. In this study, an experimental investigation was carried out to study the saturated flow condensation heat transfer coefficients of R50 and R170 in a horizontal smooth tube with inner diameter of 4 mm. The experiments were implemented at mass flux of 100-250 kg/m2 s, saturation pressure of 2.5 MPa with the vapor quality from 0 to 1. Based on the experimental data of R170, the sensitivity of mass flux was determined, h ∝ m0.9. Under the same experimental conditions, the flow condensation heat transfer coefficients of R50 are always higher than that of R170. The analysis results indicated that the different thermodynamic properties (density, thermal conductivity, viscosity) contribute to these differences. An improved condensation heat transfer correlation for annular flow was proposed and predicted the experimental results well with a mean absolute relative deviation of 7.21%.