Comparative analysis of various CO 2 configurations in supermarket refrigeration systems

Sharma, Vishaldeep; Fricke, Brian; Bansal, Pradeep

doi:10.1016/j.ijrefrig.2014.07.001

Cited by 96 publications

(50 citation statements)

References 8 publications

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“…Focussing on cascade systems with CO2 as low temperature refrigerant, Sharma et al [4] and Llopis et al [5], using a theoretical approach, concluded that cascade systems using CO2 as low temperature refrigerant are a good alternative to the current R404A direct expansion systems.…”

Section: Introductionmentioning

confidence: 99%

Effects caused by the internal heat exchanger at the low temperature cycle in a cascade refrigeration plant

Llopis

Sanz-Kock

Sánchez

et al. 2016

Applied Thermal Engineering

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This work analyses and quantifies the effects caused by the use of an internal heat exchanger (IHX) at the CO2 subcritical cycle in an HFC134a/CO2 cascade refrigeration plant that incorporates a gas-cooler at the exit of the low temperature compressor. Previous theoretical and experimental studies showed that the IHX reduces the refrigeration capacity and COP of the subcritical cycle, however, it has been seen that it also lowers the heat to be rejected at the condenser. This reduction, when the cycle is a part of a cascade system, allows reducing the heat load of the high temperature cycle, modifying the working conditions of the cascade plant. The modifications result in an increment of the overall coefficient of performance of the cascade system. The analysis here presented is based on the evaluation of an experimental HFC134a/CO2 refrigeration plant, which has been analysed with and without internal heat exchanger in an evaporating temperature range from -40 to -30 ºC and in a condensing one from 30 to 50 ºC. The plant incorporates a gas-cooler at the exit of the CO2 compressor. The experimental results confirm that the IHX slightly reduces the cooling capacity but it can increment the overall COP up to 3.7 %.

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Section: Introductionmentioning

confidence: 99%

Effects caused by the internal heat exchanger at the low temperature cycle in a cascade refrigeration plant

Llopis

Sanz-Kock

Sánchez

et al. 2016

Applied Thermal Engineering

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“…Both cascade types uses subcritical CO2 in direct expansion for low temperature, but the direct one works in direct expansion for medium temperature and the indirect one works with a secondary fluid for medium temperature [O. Abdelaziz (2012); Vishaldeep et al (2014); M. Beshr et al (2015), R. Llopis et al (2015,a)]. …”

Section: Introductionmentioning

confidence: 99%

Energy evaluation of R152a as drop in replacement for R134a in cascade refrigeration plants

Cabello

Sánchez

Llopis

et al. 2017

Applied Thermal Engineering

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An experimental comparison has been performed of a cascade refrigeration facility working with therefrigerant pairs R134a/R744 and R152a/R744. This kind of facility is suitable for industrial and commercial refrigeration applications. The high GWP refrigerant R134a has been substituted with the low GWP refrigerant R152a, in accordance with the new environmental regulations aimed at mitigating the Greenhouse effect. As both refrigerants belong to the family of HFC fluids, the replacement has been carried out as a drop-in. Apart from safety considerations, as R152a is included in the A2 group, the results of the wide range of tests conducted show that no special energy improvement or worsening is achieved, and that the replacement of R134a with R152a is technically and energetically feasible. KEYWORDS

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“…Besides widely used refrigerator-freezer for households, the two-stage compression CO 2 refrigeration cycle with different temperatures also has been getting a growing concern. Sharma et al [16] presented an optimizing analysis on the various multitemperature transcritical cycles including cascaded and secondary loop refrigeration cycle systems which are becoming popular in the supermarket applications.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic analysis of a new dual evaporator CO2 transcritical refrigeration cycle

Abdellaoui¹,

Kairouani²

2017

Archives of Thermodynamics

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In this work, a new dual-evaporator CO2 transcritical refrigeration cycle with two ejectors is proposed. In this new system, we proposed to recover the lost energy of condensation coming off the gas cooler and operate the refrigeration cycle ejector free and enhance the system performance and obtain dual-temperature refrigeration simultaneously. The effects of some key parameters on the thermodynamic performance of the modified cycle are theoretically investigated based on energetic and exergetic analysis. The simulation results for the modified cycle indicate more effective system performance improvement than the single ejector in the CO2 vapor compression cycle using ejector as an expander ranging up to 46%. The exergetic analysis for this system is made. The performance characteristics of the proposed cycle show its promise in dual-evaporator refrigeration system.

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Comparative analysis of various CO 2 configurations in supermarket refrigeration systems

Cited by 96 publications

References 8 publications

Effects caused by the internal heat exchanger at the low temperature cycle in a cascade refrigeration plant

Effects caused by the internal heat exchanger at the low temperature cycle in a cascade refrigeration plant

Energy evaluation of R152a as drop in replacement for R134a in cascade refrigeration plants

Thermodynamic analysis of a new dual evaporator CO2 transcritical refrigeration cycle

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