ISSN Online: 2377-424X
International Heat Transfer Conference 12
Condensation Heat Transfer and Pressure Drops of Refrigerant R-134a in Annular Helicoidal Pipes
Sinopsis
Condensation heat transfer of environmental friendly refrigerant R-134a in annular helicoidal pipe is of
significant importance to the effective design of helicoidal pipe heat exchangers for refrigeration and air
conditioning and many other applications. This paper presents an experimental investigation on condensation
heat transfer and pressure drop characteristics of R-134a in an annular helicoidal pipe. The average condensation
heat transfer coefficients and pressure drops for R-134a are experimentally determined at three different
saturated temperatures (35, 40, and 46°C) in an annular helicoidal pipe with the helix axial oriented in the same
direction as gravity. The experimental results are compared to the test data available in the open literature for
helicoidal and straight pipes.