Measurement and correlation of the (p, ρ, T) behavior of liquid propylene glycol at temperatures from (272.7 to 393.0) K and pressures up to 91.4 MPa

Sampson, Catherine C.; Yang, Xiaoxian; Xu, Jin; Richter, Markus

doi:10.1016/j.jct.2018.10.016

Cited by 13 publications

(22 citation statements)

References 123 publications

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“…Both apparatus parameters are known from calibration measurements with the reference fluids helium and water, using a polynomial based model by Outcalt and McLinden [104] (see Eqs. 2-4) as discussed in our previous works [100,101,107]. However, various further models are provided by May et al [105] or the manufacturer of the VTD [106], a systematical review by Yang et al [107] confirmed that the best regression is provided by the model by Outcalt and McLinden [104], as long as comprehensive calibration data are available over the entire temperature and pressure range.…”

Section: Calibrationmentioning

confidence: 96%

“…The density measurements were carried out using a modified commercially available Vibrating Tube Densimeter (VTD). The experimental setup was described in detail within our previous works [100,101,107]; however, a brief summary and further small adjustments are presented here. Li The essential component of the VTD (Anton Paar, Austria, type: DMA HPM) is the insulated measuring cell that is heated up or cooled down with a circulating bath thermostat (Huber, Germany, type: ministat 125-cc-NR).…”

Section: Apparatus Descriptionmentioning

confidence: 99%

“…In contrast, high-purity water was decanted into a stainless steel sample cylinder that could be attached to the sample manifold of the VTD, as illustrated in Fig. 2 and was further degassed by several freeze-pump-thaw cycles, as described in previous works [100][101][102][103]107]. Liquid nitrogen was used to freeze the sample, while several impurities remain gaseous, and were evacuated before the sample was thawed again and the cycle could be repeated.…”

Section: Experimental Materialsmentioning

confidence: 99%

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Measurement of the (p, ρ, T) Behavior of Liquid MEA and DEA at Temperatures from (293.15 to 423.15) K and Pressures up to 90 MPa

Scholz

2021

Int J Thermophys

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Densities in the homogeneous liquid phase of (mono-)ethanolamine (MEA) and diethanolamine (DEA) were investigated using a commercially available high-pressure vibrating-tube densimeter (VTD). Due to the melting point of the experimental materials, the setup of the VTD had to be modified by an insulated housing of the entire piping including the pressure pump. The insulated housing could be heated up by a temperature-controlled heating fan. The liquid samples with a purity of (0.9994 or 0.9950) mole fraction, respectively, were decanted within an inert protective argon atmosphere and further degassed by several freeze–pump–thaw cycles. Density measurements were carried out at temperatures between (293, respectively, 313 and 423) K and at pressures between (5 and 90) MPa. The resulting 140, respectively, 120 (p, ρ, T) data points, explicitly extend the published database for MEA and DEA, with regards to pressure. A comparison with the currently used equations of state for MEA and DEA revealed a maximum relative deviation of – 0.18 % for MEA and – 0.41 % for DEA, each at the highest investigated temperature and pressure. Considering the measurement uncertainties in temperature, pressure, and oscillation period, as well as uncertainties resulting from the calibration and from the impurities of the sample, the combined expanded relative uncertainty (k = 2) in density varied from (0.1027 to 0.1038) % and from (0.1104 to 0.1130) %, respectively. The VTD was previously calibrated by comprehensive measurements of water and helium and had been further validated by measurements with pure propane.

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Section: Calibrationmentioning

confidence: 96%

Section: Apparatus Descriptionmentioning

confidence: 99%

Section: Experimental Materialsmentioning

confidence: 99%

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Measurement of the (p, ρ, T) Behavior of Liquid MEA and DEA at Temperatures from (293.15 to 423.15) K and Pressures up to 90 MPa

Scholz

2021

Int J Thermophys

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“…Here, we demonstrate the advantages of applying optimal experimental design (OED) in the process of planning measurement series for thermodynamic properties with the goal to deliberately reduce the experimental effort, thus, decreasing the overall time for model development. Therefore, the issue with typical experimental design and the approach of OED will be explained using our density data of ethylene glycol published by Yang et al [1] and the density data of propylene glycol measured with the same instrument published by Sampson et al [2].…”

Section: Introductionmentioning

confidence: 99%

“…relative uncertainty of 0.151 %). To model the experimental data, Yang et al [1] fitted two empirical Schilling-type correlation equations [3]: one of the same form (same number of terms, same exponents) as for propylene glycol in the work of Sampson et al [2], and one using the "artificial intelligence powered" software tool Eureqa [4,5]. Eureqa is one of many tools that perform machine learning-based symbolic regression.…”

Section: Introductionmentioning

confidence: 99%

Planning of Measurement Series for Thermodynamic Properties Based on Optimal Experimental Design

2021

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Decreasing the time required for accurate thermodynamic property measurements is extremely desirable for model development that can respond to the needs of science and industry within a short time frame. Here, we demonstrate the application of optimal experimental design to measurements of thermodynamic properties. The technique is explored using the fitting of a Schilling-type equation from published $$(p, \rho , T)$$ ( p , ρ , T ) -measurements of ethylene glycol and propylene glycol. The analysis shows that a fixed-exponent fit using (p, T)-measurements along the five most informative isotherms produces models of relative density errors comparable to those obtained using the data along all investigated isotherms, i.e., eight or nine. It is also argued that a calculation of optimal isotherms prior to the measurement series can further increase the precision at no additional experimental effort.

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Measurement and Correlation of the (p, ρ, T) Behaviour of Liquid R-1243zf at Temperatures from (203 to 293) K and Pressures up to 15 MPa

et al. 2022

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The (p, ρ, T) behaviour of liquid 3,3,3-trifluoropropene (R-1243zf) was investigated in the temperature range from T = (203.23 to 293.72) K at pressures from p = (1.04 to 15.22) MPa utilizing a vibrating-tube densimeter. This work extends measurements of the refrigerant R-1243zf by 109 data points into the low-temperature and high-density region. A physically based and a polynomial model were used to calculate density from the measured values (temperature, pressure and oscillation period). The physically based model was used to present the densities while the polynomial model contributes to the estimate of their uncertainty. The combined expanded uncertainty (k = 2) of the experimental densities was estimated to be 1.7 kg·m−3. The reference equation of state of R-1243zf as implemented in NIST’s REFPROP 10.0 database deviates from the experimental data up to 2.0 %. To improve upon this representation, a genetic programming based symbolic regression approach was used to correlate data reported in the literature and measured in this work for liquid R-1243zf in the density range between (700 and 1240) kg·m−3. The new density correlation agrees with the experimental data within 0.2 %.

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Measurement and correlation of the (p, ρ, T) behavior of liquid propylene glycol at temperatures from (272.7 to 393.0) K and pressures up to 91.4 MPa

Cited by 13 publications

References 123 publications

Measurement of the (p, ρ, T) Behavior of Liquid MEA and DEA at Temperatures from (293.15 to 423.15) K and Pressures up to 90 MPa

Measurement of the (p, ρ, T) Behavior of Liquid MEA and DEA at Temperatures from (293.15 to 423.15) K and Pressures up to 90 MPa

Planning of Measurement Series for Thermodynamic Properties Based on Optimal Experimental Design

Measurement and Correlation of the (p, ρ, T) Behaviour of Liquid R-1243zf at Temperatures from (203 to 293) K and Pressures up to 15 MPa

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Measurement and correlation of the (p, ρ, T) behavior of liquid propylene glycol at temperatures from (272.7 to 393.0) K and pressures up to 91.4 MPa

Cited by 13 publications

References 123 publications

Measurement of the (p, ρ, T) Behavior of Liquid MEA and DEA at Temperatures from (293.15 to 423.15) K and Pressures up to 90 MPa

Measurement of the (p, ρ, T) Behavior of Liquid MEA and DEA at Temperatures from (293.15 to 423.15) K and Pressures up to 90 MPa

Planning of Measurement Series for Thermodynamic Properties Based on Optimal Experimental Design

Measurement and Correlation of the (p, ρ, T) Behaviour of Liquid R-1243zf at Temperatures from (203 to 293) K and Pressures up to 15 MPa

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Product

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Measurement and correlation of the (p, ρ, T) behavior of liquid propylene glycol at temperatures from (272.7 to 393.0) K and pressures up to 91.4 MPa