New enthalpy increment flow calorimeter and measurements on a mixture of 68% methane and 32% propane

Abstract

A new flow calorimeter Ibr measuring isobaric enthalphy increme.lt and JouleThomson efl~:ct was built :rod tested during the period 1987-1993. The calorirneter has several features that reduce the heat leakage better than previous designs: this includes thermal shields cooled by propane, a heat sink, and superinsulation on all piping. The temperature and pressure range covered by the calorimeter is 133 to 343 K and 0.17 to 14 MPa. Measurements on a mixture of 68.32'!/,, methane and 31.68 % propane are presented. The enthalpy increment measurements have an average standard uncertainty of 0.08 kJ-kg ~, or 0.22% of the enthalpy increment.

Isobaric Heat Capacity Measurements of Liquid Methane + Propane, Methane + Butane, and a Mixed Refrigerant by Differential Scanning Calorimetry at High Pressures and Low Temperatures

“…Literature values include the data of Yesavage, Mather, and Manker measured using a freon boil-off total enthalpy flow calorimeter with an estimated relative uncertainty of 3 %, and the data of Grini et al, measured using an electrically heated flow calorimeter with an estimated relative uncertainty of 0.22 % in the measured enthalpy increment. The relative difference between our results and those of Grini et al is less than 2 %, while the data of Yesavage, Mather, and Manker are within 3 % of our data, which is within the combined uncertainty of all of the measurements. The literature data for methane (1) + propane (3) have a relative scatter of about ± 3 % and are approximately centered on the predictions of GERG 2008 .…”

“…This work: ■, x 1 = 0.82, p = 5.2 MPa; ◆, x 1 = 0.81, p = 6.0 MPa; ▲, x 1 = 0.81, p = 4.7 MPa. Literature: Mather: ×, x 1 = 0.88, p = 6.9 MPa; ○, x 1 = 0.88, p = 3.4 MPa; +, x 1 = 0.72, p = 6.9 MPa; □, x 1 = 0.95, p = 1.7 MPa; △, x 1 = 0.95, p = 5.2 MPa; Manker: ∗, x 1 = 0.95, p = 6.9 MPa; Yesavage: ◇, x 1 = 0.49, p = 6.9 MPa; Grini et al: □, x 1 = 0.68, p = 14 MPa. Calculated: - - -, PR-HYSYS, x 1 = 0.82, p = 5.2 MPa, – · −, PR-REFPROP, x 1 = 0.82, p = 5.2 MPa.…”

Enthalpy increment measurements on liquid ethane between the temperatures 146.0 K and 256.2 K, at pressures (≈1.6, 3.20, and 5.07) MPa

“…(1,3) The test loop of the flow calorimeter when used for measurements on liquids is shown in the pressure against enthalpy diagram in figure 1. The measurements of interest are made in the isobaric heating section between points a and b in figure 1.…”

Enthalpy increment measurements on nitrogen between the temperatures 160 K and 260 K, at the pressures ≈(0.3, 3.0, 5.0, and 15.0) MPa

“…The electrically heated flow calorimeter used for the measurements has been described previously, (1,2) together with measurements on (0.68CH 4 + 0.32C 3 H 8 ).…”