Thermodynamic Properties
of 1,1,1,2,2,4,5,5,5-Nonafluoro-4-(trifluoromethyl)-3-pentanone:
Vapor Pressure, (<i>p</i>, ρ, <i>T</i>)
Behavior, and Speed of Sound Measurements, and an Equation of State
- Publication date
- Publisher
Abstract
We report comprehensive
thermodynamic property measurements of
1,1,1,2,2,4,5,5,5-nonafluoro-4-(trifluoromethyl)-3-pentanone. The
(<i>p, ρ, T</i>) behavior was measured from <i>T</i> = (225 to 470) K with pressures up to 36 MPa with a two-sinker
densimeter. These measurements include compressed-liquid states and
states in the extended critical region. The vapor-phase speed of sound
was measured from <i>T</i> = (325 to 500) K with pressures
up to 1.7 MPa with a spherical acoustic resonator. The vapor pressure
was measured in the spherical resonator from <i>T</i> =
(325 to 440) K with a static technique. The density and speed of sound
of the liquid was measured from <i>T</i> = (278 to 308)
K at atmospheric pressure (<i>p</i> = 83 kPa) in a benchtop
instrument employing a vibrating-U-tube densimeter and a time-of-flight
speed-of-sound technique. These data, together with selected data
from the fluid manufacturer, have been used to develop an equation
of state explicit in the Helmholtz energy covering the fluid region.
The equation of state represents the present experimental vapor-pressure
data with an RMS deviation of 0.066 %, the (<i>p, ρ, T</i>) data to 0.067 %, and the speed-of-sound data to 0.029 %. This fluid
is of interest as the working fluid in Rankine-cycle power applications
and as a fire extinguishing agent; it is also known by the trade names
Novec-649 and Novec-1230