Carbon Dioxide Turbine Expander Plant Producing Liquid and Gaseous Carbon Dioxide

Овсянник, А. В.

doi:10.21122/1029-7448-2019-62-1-77-87

Cited by 9 publications

(2 citation statements)

References 2 publications

(5 reference statements)

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“…Note: 1: refrigerating machine, 2: condensers (gas coolers), 3: pipelines, 4: automation, 5: refrigerant, 6: installation), in rubles at the rate of $1 = 76 rubles Analysis of the consumer refrigeration market shows that despite the high cost of production of refrigerating machines based on carbon dioxide, as well as due to the restrictions of the world environmental oversight organizations, the popularity of CO2 as a refrigerant is increasing every year [17,18].…”

Section: Resultsmentioning

confidence: 99%

“…Figure 2. Comparative data on capital expenditures for the design of systems based on traditional refrigerants and carbon dioxideDespite the positive data on the environmental side, the design of systems based on carbon dioxide is more expensive than the design of refrigerating machines running on most other refrigerants.Analysis of the consumer refrigeration market shows that despite the high cost of production of refrigerating machines based on carbon dioxide, as well as due to the restrictions of the world environmental oversight organizations, the popularity of CO2 as a refrigerant is increasing every year[17,18].The European and American markets for the production and consumption of refrigeration actively use carbon dioxide as an alternative to traditional refrigerating agents. The demand for CO2 cooling systems based on transcritical cycles has been…”

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Development of an Energy Efficient Refrigeration Unit Using Carbon Dioxide as a Natural Refrigerant

Neverov,

Korotkiy,

Korotkih

et al. 2023

IJHT

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Refrigeration units, ubiquitous in various industrial applications, necessitate refrigerants for effective heat transfer. The end of service life for these agents, predominantly fluorocarbon-based, poses significant environmental hazards, necessitating safer alternatives. To mitigate fluorine-based environmental pollution, several solutions are under exploration, with a key proposal being the utilization of natural substances, such as carbon dioxide (R744), as refrigerants. This study introduces a novel design for a refrigeration unit operating on carbon dioxide. Distinctively, the proposed unit incorporates a series of nozzles in the refrigerator compartment that spray the refrigerant directly onto the food items, thereby expediting the cooling process. The operation principle of this unit, based on direct contact between carbon dioxide and the food products, is its primary novelty. A calculation technique is proposed for the selection of unit components, enhancing the cooling efficiency by facilitating direct heat exchange between the refrigerant and the product. The design includes a 3D model of the unit, developed in accordance with the sizes of currently manufactured equipment, and a layout that ensures mobility. The implementation of a recuperation principle in the unit allows a 20% reduction in refrigerant mass consumption, while the direct contact method increases the freezing rate by 30%. The proposed utilization of R744 as a refrigerant could significantly attenuate the emission of ozone-depleting substances, thereby contributing positively to the current environmental situation.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Development of an Energy Efficient Refrigeration Unit Using Carbon Dioxide as a Natural Refrigerant

Neverov,

Korotkiy,

Korotkih

et al. 2023

IJHT

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Thermodynamic analysis and optimization of low-boiling fluid parameters in a turboexpander

Ovsyannik

Kliuchinski

2020

J. Phys.: Conf. Ser.

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The influence of the initial parameters of a low-boiling working fluid on the thermodynamic efficiency for two turbo-expander cycles (with a heat exchanger at the outlet of the turbo-expander and without a heat exchanger) is considered. For each of the studied cycles, the dependences of the exergy efficiency on the temperature of the low-boiling working fluid before the turboexpander at a constant pressure and the dependence of the exergetic efficiency on the pressure of the low-boiling working fluid before the turbo-expander at a constant temperature were obtained. The dependences of exergy losses on the elements of the studied cycles on the parameters of a low-boiling working fluid are constructed and their analysis is carried out. For the considered schemes, the dependences of the exergy efficiency on pressure are constructed at various temperatures of the low-boiling working fluid in front of the turboexpander. An analysis of the results showed that at any temperature of a low-boiling working fluid, it is possible to determine the pressure at which the exergy efficiency of the investigated circuit will be maximum. Graphic dependencies are obtained that are characterized, from a thermodynamic point of view, by the optimal parameters of a low-boiling working fluid. Comparison of these dependences revealed that, over the entire range of studied temperatures (from 100 °C to 300 °C), a cycle with a heat exchanger at the outlet of the turboexpander has a large exergy efficiency. These graphical dependencies make it possible to determine the optimal parameters of the working fluid in the turboexpander cycle, as well as to predict the change in the exergy efficiency of the installation with changing parameters of the working fluid.

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Thermodynamic Analysis of Ozone-Safe Low Boiling Working Media for Turbo-Expander Plants

Овсянник

Ключинский

2020

Izv. vysh. ucheb

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The article considers 46 low-boiling working media (LBWM) with zero potential for ozone layer destruction. Out of them, 14 ones are single-component hydrofluorocarbon refrigerants, 28 ones are multi-component mixtures of hydrofluorocarbon refrigerants, and the four ones are native refrigerants. Thermodynamic analysis of working media based on the classical turbo-expander scheme with a heat exchanger designed to cool the superheated LBWM that has left the turbo-expander has been performed. For this scheme, a cycle is constructed in T–s-coordinates. The LBWM was compared using the exergetic coefficient of efficiency (KE). In the course of the study, it was found that for some LBWM, the sequence of location of the exergetic efficiencydependences on temperature at thermodynamically optimal working medium pressures is preserved over the entire temperature range under study (from 100 to 300 оC). In other words,if the working medium has the highest exergetic efficiency coefficient, then this property is inherent in it at any temperature in a given interval. It is proposed to perform the analysis of the LBWM for exergetic efficiency at an arbitrarily selected temperature (250 оC). The study demonstrated that the highest exergetic efficiency of natural refrigerants is R600A (50.25 %), among single component hydrofluorocarbon refrigerants – R245FA (50.00 %), R1233ZD(E) (49.91 %), R236EA (49.59 %), among multi-component mixtures of hydrofluorocarbon refrigerants – R429A (47.92 %), R430A (47.49 %) and R423A (47.47 %). Out of the all examined refrigerants, the following ones have the highest exergetic efficiency of all the considered LBWM: R600A, R245FA, R1233ZD(E), R236EA, R1234ZE(Z), R236FA. They belong to both natural refrigerants (hydrocarbons) and single-component hydrofluorocarbons. It should be noted that each of these working media has its drawbacks: some have a high potential for global warming, others are explosive, and others have a high cost.

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Carbon Dioxide Turbine Expander Plant Producing Liquid and Gaseous Carbon Dioxide

Cited by 9 publications

References 2 publications

Development of an Energy Efficient Refrigeration Unit Using Carbon Dioxide as a Natural Refrigerant

Development of an Energy Efficient Refrigeration Unit Using Carbon Dioxide as a Natural Refrigerant

Thermodynamic analysis and optimization of low-boiling fluid parameters in a turboexpander

Thermodynamic Analysis of Ozone-Safe Low Boiling Working Media for Turbo-Expander Plants

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