Experimental determination of the optimum intermediate and gas-cooler pressures of a commercial transcritical CO2 refrigeration plant with parallel compression

Nebot‐Andrés, Laura; Sánchez, Daniel; Calleja-Anta, Daniel; Cabello, R.

doi:10.1016/j.applthermaleng.2021.116671

Cited by 30 publications

(10 citation statements)

References 19 publications

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“…Nebot-Andrés et al have conducted an experimental study to investigate the vapour compression refrigeration system using two compression stages, and to determine the optimal operating situations. The authors have concluded that there is a correlation between the COP value and the intermediate pressure, and if it decreases or increases, the COP value decreases [11].…”

Section: Kim and Bullard Have Conducted An Experimental Study To Anal...mentioning

confidence: 99%

The Effect of Condenser Type and Refrigerant Type on the Two-Stage Vapour Compression Refrigeration System: An Experimental Study

ÇAKIR¹,

TUNÇİL²

2023

Politeknik Dergisi

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In this study, the effects of refrigerants and condenser type on the coefficient (COP) of performance value in a two-stage intercooled vapour compression refrigeration system have been investigated experimentally with the designed device. There is a total of eight configurations designed for experiments, and these are compared with each other. During the experiments, a copper tube condenser, a micro-channel condenser, and R404A and R449A refrigerants were used in the designed device. The main focus of this study is to investigate the effect of condenser type, refrigerants, and the number of compressors on the COP in a vapor compression refrigeration system. In this study, it was concluded that designs using a micro-channel condenser have a higher COP than designs using a copper tube condenser, and the most efficient design for the system is the one using the micro-channel condenser and working with R449A refrigerant.

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Section: Kim and Bullard Have Conducted An Experimental Study To Anal...mentioning

confidence: 99%

The Effect of Condenser Type and Refrigerant Type on the Two-Stage Vapour Compression Refrigeration System: An Experimental Study

ÇAKIR¹,

TUNÇİL²

2023

Politeknik Dergisi

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“…In order to evaluate the unavoidable exergy destruction of components in the system, further exergy analysis was carried out. The ratio exergy of refrigerants at each point of state can be defined as [20] : (12) where subscript j represents the exergy state points 1-15 in Figure 1, and 0 represents the reference state point of the system (T0 and P0). The reference state is generally set to the ambient temperature, the specific enthalpy and specific Entropy of refrigerant at = 298.15K and = 101.325kPa.…”

Section: Conventional Exergy Analysis Modelmentioning

confidence: 99%

“…It was found that the performance of the new cycle introduced after adjusting the different system parameters is 20-80% higher than that of the conventional cycle [11] . Nebot et al [12] sought a high performance refrigeration system to optimize the performance of the system in actual operation. The experiments validated the existence of the optimum intermediate pressure and the optimum pressure of the gas cooler in the novel transcritical CO2 refrigeration system.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the ejector two-stage compression refrigeration cycle with work performance from energy, conventional exergy and advanced exergy perspectives

Xie

Yang

Zhu

et al. 2022

Preprint

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Low temperature cold chain is the top priority of logistics development at this stage. CO2 (carbon dioxide) refrigeration system is widely used. However, the low efficiency of CO2 refrigeration system is the biggest obstacle to its development. In this research work, a novel trans-critical CO2 refrigeration cycle with ejector for cryogenic storage is proposed. The energy and traditional exergy model of the system are established, and the advanced exergy model is established based on the traditional exergy model, and the actual performance of the system is analyzed. The results show that the exergy destruction of each component of the ejector is the largest in the system, and the optimization potential is the highest in both traditional and advanced exergy models. After studying the influence of main parameters in the system cycle on the system performance and performance, it is found that there is an optimum intermediate pressure and gas cooler pressure in the system to maximize the system performance and efficiency. According to the influence of the change of system parameters on the system, it is found that the outlet temperature of gas cooler has the greatest influence on the optimization of ejector.

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“…The five controlled devices target values can be regulated steplessly within the adjustment range to obtain any experimentally required operating conditions. Laura Nebot-Andr´es et al 19 established the experimental CO 2 plant used to obtain optimal operating conditions at gas cooler exit temperatures of 27.5 °C, 32.5 °C and 37.5 °C and evaporation levels of −15.0 °C, −10.0 °C and −5.0 °C. In 19, the devices were regulated singly.…”

Section: Introductionmentioning

confidence: 99%

Application of PLC and HMI in the CO2 transcritical refrigeration experimental platform

Gao

Wang

Xie

2022

Sci Rep

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The paper adopted SIMATIC PLC as the control center and cooperates with SIMATIC KTP900 basic touch screen and GRM533YW-C IOT module to design a CO2 transcritical refrigeration experiment platform (EXP). The EXP acquired analog signals from sensors through PLC expansion modules. The PLC communicated with the touch screen and the IoT module through PROFINET to achieve data interaction. In the EXP, the touch screen and the remote devices had separate control interfaces, both of which can perform system control and real-time data display. The control strategy and abnormal alarm of CO2 transcritical refrigeration system was accomplished in PLC. In the cooling experiment, the maximum deviation value of temperature was less than 0.4 °C in the refrigeration container. In the 750 W load step experiment, the static error of the temperature was ± 0.2 °C in the refrigeration container, and the static error of the superheat was ± 0.17 K. This indicated that the EXP had excellent control quality. The different control strategies for the compressor, gas cooler fan, auxiliary cooler fan, EEV and pressure regulating valve can be realized in the EXP. Therefore, the performance optimization of CO2 transcritical refrigeration system in different operating conditions can be studied.

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Experimental determination of the optimum intermediate and gas-cooler pressures of a commercial transcritical CO2 refrigeration plant with parallel compression

Cited by 30 publications

References 19 publications

The Effect of Condenser Type and Refrigerant Type on the Two-Stage Vapour Compression Refrigeration System: An Experimental Study

The Effect of Condenser Type and Refrigerant Type on the Two-Stage Vapour Compression Refrigeration System: An Experimental Study

Evaluation of the ejector two-stage compression refrigeration cycle with work performance from energy, conventional exergy and advanced exergy perspectives

Application of PLC and HMI in the CO2 transcritical refrigeration experimental platform

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