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Isochoric Heat Capacities of Ethanol-Water Mixtures at Temperatures from 280 K to 420 K and Pressures to 30 MPa

Published

Author(s)

Hiroshi Kitajima, Noboru Kagawa, Harumi Endo, Seizo Tsuruno, Joe W. Magee

Abstract

Specific heat capacity at constant volume is one of the most important thermodynamic properties to develop and evaluate thermodynamic equations of state. With this viewpoint, isochoric heat capacities of ethanol-water mixtures have been measured with a twin-cell type adiabatic calorimeter developed at the National Defense Academy. Temperatures were measured with a platinum resistance thermometer on the bottom of each cell and were reported on the ITS-90. Sample pressure measurements were made with a quartz crystal transducer. Densities were calculated from the volume of the calorimeter cell and sample mass. The experimental expanded uncertainty (with a coverage factor k=2) of temperature measurements is plus or minus} 13 mK, and that of pressure measurement is plus or minus} 8 kPa. The expanded relative uncertainty for isochoric heat capacity is estimated to be plus or minus} 2 % for liquid phase measurements, and for density it is plus or minus} 0.16 %. The present measurements for xC2H5OH + (1-x) H2O} with x = (0.104, 0.253, 0.498 and 0.755), were obtained at temperatures ranging from 280 to 420 K and at pressures up to 30 MPa.
Proceedings Title
Asian Conf. on Refrigeration and Air Conditioning, Proc.
Conference Location
Kobe, 1, JA
Conference Title
Asian Conf. on Refrigeration and Air Conditioning

Citation

Kitajima, H. , Kagawa, N. , Endo, H. , Tsuruno, S. and Magee, J. (2003), Isochoric Heat Capacities of Ethanol-Water Mixtures at Temperatures from 280 K to 420 K and Pressures to 30 MPa, Asian Conf. on Refrigeration and Air Conditioning, Proc., Kobe, 1, JA (Accessed April 18, 2024)
Created December 31, 2002, Updated October 12, 2021