Numerical investigation of CO2 behavior in the internal heat exchanger under variable boundary conditions of the transcritical refrigeration system

Ituna-Yudonago, J.F.; Belman-Flores, J.M.; Elizalde‐Blancas, Francisco; Garcı́a-Valladares, O.

doi:10.1016/j.applthermaleng.2017.01.042

Cited by 23 publications

(6 citation statements)

References 47 publications

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“…The time step independence of the results (Figure 3) is verified by analyzing 4 different time steps (Ituna et al, 2017), for this study the values 5 × 10 −3 s, 1 × 10 −3 s, 5 × 10 −4 s, 1 × 10 −3 s were used. The analysis is based on the case corresponding to the fraction of -25 µm since it was the case that reported the least difference with respect to the experimental data.…”

Section: Resolution By Simulation By Cfd Of the Mathematical Models Corresponding To The Hydrodynamics And Mass Transfermentioning

confidence: 81%

Entropy and Hurst analysis for the determination of two-phase flow time series complexity

Rodrígurez¹,

Vizguerra²,

Corona³

et al. 2023

RMIQ

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Section: Resolution By Simulation By Cfd Of the Mathematical Models Corresponding To The Hydrodynamics And Mass Transfermentioning

confidence: 81%

Entropy and Hurst analysis for the determination of two-phase flow time series complexity

Rodrígurez¹,

Vizguerra²,

Corona³

et al. 2023

RMIQ

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“…However, the mechanical subcooling system without an IHX can also improve the energy efficiency [111]. Furthermore, Ituna-Yudonago et al [112] analyzed the effect of transient thermal effectiveness of an IHX on a CO 2 system, and they reported that increasing the CO 2 temperature by 10 • C at the IHX inlet of the gas cooler side could decrease the COP of about 3% due to reduced HTC and IHX effectiveness.…”

Section: An Auxiliary Component: Internal Heat Exchangermentioning

confidence: 99%

Recent Advances in Transcritical CO2 (R744) Heat Pump System: A Review

et al. 2019

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Heat pump (HP) is one of the most energy efficient tools for address heating and possibly cooling needs in buildings. Growing environmental concerns over conventional HP refrigerants, chlorofluorocarbons (CFCs), and hydrofluorocarbons (HFCs) have forced legislators and researchers to look for alternatives. As such, carbon dioxide (R744/CO2) has come to light due to its low global warming potential (GWP) and zero ozone depleting characteristics. Even though CO2 is environmentally benign, the performance of CO2 HP has been of concern since its inception. To improve the performance of CO2 HP, research has been playing a pivotal role in developing functional designs of heat exchangers, expansion devices, and compressors to suit the CO2 transcritical cycle. Different CO2 HP cycles coupled with auxiliary components, hybrid systems, and refrigerant mixtures along with advanced control strategies have been applied and tested. This paper presents a complete overview of the most recent developments of transcritical CO2 HPs, their components, and applications.

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“…Through numerical modelling, Ituna-Yudonago et al [33] investigated the transient behaviour of the CO 2 flowing in an IHX similar to that shown in Figure 10. The research found that the CO 2 inlet temperature and mass flow rate affect the CO 2 thermophysical properties.…”

Section: Internal Heat Exchangermentioning

confidence: 99%

CO2 Refrigeration and Heat Pump Systems—A Comprehensive Review

2019

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An increased awareness of the impacts of synthetic refrigerants on the environment has prompted the refrigeration industry and researchers worldwide to seek better alternatives in terms of technical, economic and environmental performance. CO2 refrigerant, also known as R744, has re-emerged as a potential alternative to existing refrigerants with its zero ozone depletion potential (ODP) and impressively low global warming potential (GWP). A refrigeration system utilising this refrigerant, however, suffers performance degradation when it operates in warm or hot climatic regions due to its inevitable operation in the supercritical region. In addition, the CO2 refrigerant properties necessitate the need for components designed to withstand very high operating pressures. These challenges have not been let unnoticed; related industries and researchers are actively involved in research and development of various components and systems which in turn encourages increased applications of these systems. In this paper, a comprehensive review of CO2 refrigeration systems and the state of the art of the technology and its applications in various industries is presented. In particular, the paper reviews recent research and developments on various aspects of CO2 systems including cycle modifications, exergy analysis of the systems, system modelling, transcritical operation consideration and various existing and potential applications.

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Numerical investigation of CO2 behavior in the internal heat exchanger under variable boundary conditions of the transcritical refrigeration system

Cited by 23 publications

References 47 publications

Entropy and Hurst analysis for the determination of two-phase flow time series complexity

Entropy and Hurst analysis for the determination of two-phase flow time series complexity

Recent Advances in Transcritical CO2 (R744) Heat Pump System: A Review

CO2 Refrigeration and Heat Pump Systems—A Comprehensive Review

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