Investigation of solubilities of carbon dioxide in five levulinic acid-based deep eutectic solvents and their thermodynamic properties

The computation of power cycles employing carbon dioxide as working fluid and extending down to the critical region requires the knowledge of the thermodynamic properties of CO2 within a wide range of pressures and temperatures. Available data are recognized to be insufficient or insufficiently accurate chiefly in the vicinity of the critical dome. Newly published density and specific heat measurements are employed to compute thermodynamic functions at temperatures between 0 and 50 deg C, where the need of better data is more urgent. Methods for the computation of thermal properties from density measurement in the low and in the high temperature range are presented and discussed. Results are reported of the computation of entropy and enthalpy of CO2 in the range 150–750 deg C and 40–600 atm. The probable precision of the tables is inferred from an error analysis based on the generation, by means of a computer program of a set of pseudoexperimental points which, treated as actual measurements, yield useful information about the accuracy of the calculation procedure.

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Choline-Based Deep Eutectic Solvents for Mitigating Carbon Dioxide Emissions

Novel Materials for Carbon Dioxide Mitigation Technology ◽

10.1016/b978-0-444-63259-3.00003-3 ◽

2015 ◽

pp. 87-116 ◽

Cited By ~ 2

Author(s):

Yingying Zhang ◽

Xiaoyan Ji ◽

Xiaohua Lu

Keyword(s):

Carbon Dioxide ◽

Carbon Dioxide Emissions ◽

Deep Eutectic Solvents

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Analysis of operating conditions of a cooling installation with carbon dioxide

E3S Web of Conferences ◽

10.1051/e3sconf/201910000005 ◽

2019 ◽

Vol 100 ◽

pp. 00005

Author(s):

Artur Bieniek ◽

Łukasz Mika ◽

Jan Kuchmacz

Keyword(s):

Carbon Dioxide ◽

Energy Efficiency ◽

High Pressure ◽

Thermodynamic Properties ◽

Ambient Temperature ◽

Air Temperature ◽

Operating Conditions ◽

Efficiency Ratio ◽

Summer Period ◽

International Regulations

In response to international regulations, natural refrigerants such as carbon dioxide are more and more frequently used in the refrigeration industry. Due to thermodynamic properties, R-744 is used in the transcritical cycle as an individual refrigerant. In the hereby article, high pressure of CO2 and air temperature values were analysed. The measurements were conducted on the gas cooler side and involved external air temperature values in the summer period between 1 June to 30 September 2018. The “Booster” installation was used in one of Polish supermarkets. Correlations required to determine the optimal pressure of carbon dioxide depending on ambient temperature were presented in the article. The equations presented hereby allowed to maximize the energy efficiency ratio. An optimal high pressure for one of the correlations from literature was calculated on the basis of the measurement of ambient temperature. Actual and optimal pressure values of carbon dioxide were compared in the analysed period of time.

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Climate Change and Refrigerants: Thermodynamic Properties of Low-GWP Fluids for Domestic Applications and Binary Systems for Low-Temperature Options

Applied Sciences ◽

10.3390/app10062014 ◽

2020 ◽

Vol 10 (6) ◽

pp. 2014 ◽

Cited By ~ 2

Author(s):

Mariano Pierantozzi ◽

Sebastiano Tomassetti ◽

Giovanni Di Nicola

Keyword(s):

Climate Change ◽

Carbon Dioxide ◽

Global Warming ◽

Low Temperature ◽

Thermodynamic Properties ◽

Experimental Research ◽

Binary Systems ◽

Research Activity ◽

Greenhouse Gasses ◽

Low Global Warming Potential

The most commonly used refrigerants are potent greenhouse gasses that can contribute to climate change. Hydro-Fluoro-Olefins are low Global Warming Potential fluids. A summary of our experimental research activity on the thermodynamic properties of two environmentally friendly Hydro-Fluoro-Olefins, namely R1234yf and R1234ze(E), is reported. In particular, the measurements were performed with an isochoric apparatus and the apparatus specifically built to reach temperatures down to about 100 K. The data elaboration confirms the validity of the choice and that R1234yf and R1234ze(E) can be adopted in many domestic applications. Moreover, considering the reduction of the flammability issues of R1234yf and R1234ze(E), the properties of binary systems containing these fluids and carbon dioxide were analyzed. The presented mixtures could be very interesting for low-temperature applications such as cascade cycles.

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