Comparative study of transcritical vapor compression configurations using CO2 as refrigeration mode base on simulation

Pérez-García, V.; Belman-Flores, J.M.; Navarro-Esbrí, Joaquin; Rubio-Maya, Carlos

doi:10.1016/j.applthermaleng.2012.10.018

Cited by 31 publications

(17 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The performance of trans-critical CO 2 cooling system, however, is lower than that of conventional air-conditioners, due to large expansion losses and high irreversibility during the gas-cooling process (Aprea and Maiorino 2009a, b;Pérez-García et al 2013). Therefore, many researchers analyzed the performance of the transcritical CO 2 refrigeration cycle, in order to identify opportunities to improve the energy efficiency of the system .…”

Section: Introductionmentioning

confidence: 99%

An experimental study on charge optimization of a trans-critical CO2 cycle

Aprea

Greco

Maiorino

2014

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

The phasing out of hydrochlorofluorocarbon and chlorofluorocarbon fluids and further environmental problems arising from new, synthetic working fluids stimulate a continuously rising interest on natural candidates. The nontoxic and nonflammable CO 2 impacts neither on ozone depletion nor on global warming if leaked to the atmosphere. The critical temperature of CO 2 (31.1°C) is almost ambient and, therefore, it undergoes a transcritical refrigeration cycle. In cooling mode operation, a trans-critical CO 2 system, as compared to conventional airconditioners, has a lower performance which, contrary to conventional systems, strongly depends on the refrigerant charge. In this paper, the performance of the trans-critical system was evaluated experimentally under different refrigerant charge amounts. The influence of charge on coefficient of performance (COP), cooling capacity, compression ratio, suction line superheat was analyzed in detail. The experimental results indicate that the COP of the trans-critical cycle attains a maximum at optimal refrigerant charge. By varying the charge the cooling capacity attains a maximum, as well, that corresponds to the optimal charge. In order to understand the effect of refrigerant charge on the performance of each device of the plant, an exergetic analysis based on the experimental data was carried out. The analysis shows that the exergy flow destroyed in the compressor is one of the major causes of overall exergy destruction. At the optimal refrigerant charge, the compression losses attain a minimum.

show abstract

Section: Introductionmentioning

confidence: 99%

An experimental study on charge optimization of a trans-critical CO2 cycle

Aprea

Greco

Maiorino

2014

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…This is because the added capacity no longer compensates for the additional work required for the compression. Hence, there is an optimum high pressure at which the system yields the best COP, such that identifying this optimum high pressure corresponding to the maximum COP is very important to the design of a trans-critical CO 2 refrigeration cycle [8,9]. In general, the optimum high pressure varies depending on the fluid temperature prior to throttling.…”

Section: Re-liquefaction Cyclementioning

confidence: 98%

Compressor selection methods for multi-stage re-liquefaction system of liquefied CO2 transport ship for CCS

Jeon

Kim

2015

Applied Thermal Engineering

View full text Add to dashboard Cite

“…In this context, the field of refrigeration has been affected, mainly, because of two issues that are currently under study: the reduction of energy consumption, and the decrease of greenhouse gas emission. Thus, different and new alternatives to reduce energy consumption or achieve more efficient systems [1,2], are an important investigation subject in this field. In the same way, the use of environment friendly refrigerants [3e5] has become an area of great research.…”

Section: Introductionmentioning

confidence: 99%