Experiments on boiling/condensation heat transfer and pressure drop of refrigerant HFO1336mzz(E) and the mixture inside a horizontal microfin tube

摘要

This study experimentally investigated the boiling/condensation heat transfer and pressure dropcharacteristics of HFO1336mzz(E) and a mixture of HFO1336mzz(E) and HFO1336mzz(Z), insidea horizontal microfin tube. The test tube was copper, with an outside diameter of 9.52 mm, anequivalent inner diameter of 8.95 mm, fin heights of 0.12 mm, a helix angle of 16.5°, and 65 fins.The experiments were conducted under a mass velocity range from 50 to 300 kgm~(-2)s~(-1) at boiling andcondensation saturated temperatures of 40 °C and 60 °C. The relationship between heat transfercoefficient/frictional pressure drop and vapor quality in boiling and condensation processes wereclarified. The boiling/condensation heat transfer coefficient of HFO1336mzz(E) was lower than thatof R245fa, however the pressure drop of HFO1336mzz(E) was lower than that of R245fa.