Investigations into air and refrigerant side heat transfer coefficients of finned-tube CO2 gas coolers

Santosa, I Dewa Made Cipta; Gowreesunker, Baboo Lesh; Tassou, S.A.; Tsamos, Konstantinos M.; Ge, Y.T.

doi:10.1016/j.ijheatmasstransfer.2016.11.011

Cited by 35 publications

(20 citation statements)

References 23 publications

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“…First, installing the eligible gas cooler that can minimize the discharge pressure. Because the transcritical condition of the gas cooler is significantly important to control the discharge pressure, and usually using higher capacity than that the condenser [14]- [16]. Second, other solution, adding the internal heat exchanger that will be conducted in the next study in this research project.…”

Section: Preliminary Results and Discussionmentioning

confidence: 99%

“…In summary, it can be argued that the heat exchanger in discharge pressure especially the condenser/gas cooler is significantly important to improve the performance of the system [14]. Because it works above critical point then the previous researcher indicated the performance of the gas cooler with approach temperature (AT) [20].…”

Section: Preliminary Results and Discussionmentioning

confidence: 99%

“…The compressor performance is determined by the isentropic efficiency. Process 2-3 is heat rejection processed by a gas cooler (cooling in one Fig.1 Schematic diagram of CO 2 refrigeration booster system design phase) due to transcritical condition [14] then the performance parameter used here is approach temperature refer to Eq. (10).…”

Section: Simulation Designmentioning

confidence: 99%

“…Firstly, they concerned about gas cooler/condenser optimization [13][14][15][16], which obtained that the gas cooler design can effect significantly in supercritical condition. Secondly, improvement used application of Internal Heat Exchanger (IHX) [3], [6], [17].…”

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Transcritical Co2 Refrigeration System for Supermarket Application

Santosa¹

2018

GEOMATE

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Environmental issues becomes a priority on the refrigeration system development. The main issues are global warming and ozone depletion which are emitted from the conventional refrigeration system. One of the natural and clean refrigerants is Carbon dioxide (CO 2 ). CO 2 refrigeration system however still has low performance when operating at high ambient temperature. This study aim is to investigate the performance of CO 2 transcritical refrigeration system in high outdoor temperature. The research was carried out by theoretical study and numerical analysis of the refrigeration system using the EES (Engineering Equation Solver) program. Data input and simulation validation were obtained from experimental and secondary data. The result showed that the coefficient of performance (COP) decreased gradually with the outdoor temperature variation increasing. With temperature input increases between 25 o C -45 o C, the performance (indicated by overall COP) decreased by 3.0 %. These results will be significantly important for a preliminary reference to improve the CO 2 refrigeration system design in hot climate temperature application.

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Section: Preliminary Results and Discussionmentioning

confidence: 99%

Section: Preliminary Results and Discussionmentioning

confidence: 99%

Section: Simulation Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Performance Analysis of Transcritical Co2 Refrigeration System for Supermarket Application

Santosa¹

2018

GEOMATE

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“…For tropical climates (hot climate) this system will work in supercritical conditions due to high ambient temperatures. Data from previous studies obtained switch points from sub critical to trans critical in the CO2 Refrigeration system with a booster hot gas bypass with an optimum gas cooler component, occurring at temperatures above 27 o C [1] and of course this condition changes according to the performance of the gas cooler, where this point will be higher when the performance of the gas cooler become better. To get the optimum gas cooler performance, the correlation between ambient temperature and the gas cooler optimum pressure can produce the highest Coefficient of Performance.…”

Section: Introductionmentioning

confidence: 99%

Effectiveness Simulation of Internal Heat Exchanger (IHX) Combination Investigation on CO2 Refrigeration

Santosa¹,

Waisnawa²,

Temaja³

2018

Proceedings of the International Conference on Science and Technology (ICST 2018)

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As natural refrigerant, carbon dioxide has excellent thermo physics, safe, nontoxic and cheap. This reason causes the CO2 becomes the best refrigerant alternatives. However, CO2 refrigeration system still has relatively low performance when operate in hot environment temperature. This study aims is to investigate the performance of CO2 trans critical refrigeration system using Internal Heat Exchanger (IHX) in tropical outdoor temperature and will compare with standard CO2 refrigeration system which has been studied previously. The research will be carried out by theoretical study and numerical analysis of the refrigeration system using the EES (Engineering Equation Solver) program. Data input and simulation validation are obtained from experimental and secondary data. The result shows that the simulation has good agreement with the experimental results. Errors only as much as 1% up to 2 % so it can be argued that the simulation valid for CO2 refrigeration system with IHX combination analysis especially when the system is operated in tropical climate i.e. Indonesia.

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Modelling and Evaluation of the Thermohydraulic Performance of Finned-Tube Supercritical Carbon Dioxide Gas Coolers

Chai

Tsamos

Tassou

2021

Advances in Heat Transfer and Thermal Engineering

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This paper investigates the thermohydraulic performance of finned-tube supercritical carbon dioxide (sCO 2 ) gas coolers operating with refrigerant pressures near the critical point. A distributed modelling approach combined with the ε-NTU method has been developed for the simulation of the gas cooler. The heat transfer and pressure drop for each evenly divided segment are calculated using empirical correlations for Nusselt number and friction factor. The model was validated against test results and then used to investigate the influence of design and operating parameters on local and overall gas cooler performance. The results show that the refrigerant heat-transfer coefficient increases with decreasing temperature and reaches its maximum close to the pseudocritical temperature before beginning to decrease. The pressure drop increases along the flow direction with decreasing temperature. Overall performance results illustrate that higher refrigerant mass flow rate and decreasing finned-tube diameter lead to improved heat-transfer rates but also increased pressure drops. Design optimization of gas coolers should take into consideration their impact on overall refrigeration performance and life cycle cost. This is important in the drive to reduce the footprint of components, energy consumption, and environmental impacts of refrigeration and heat-pump systems. The present work provides practical guidance to the design of finned-tube gas coolers and can be used as the basis for the modelling of integrated sCO 2 refrigeration and heat-pump systems.

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Investigations into air and refrigerant side heat transfer coefficients of finned-tube CO2 gas coolers

Cited by 35 publications

References 23 publications

Performance Analysis of Transcritical Co2 Refrigeration System for Supermarket Application

Performance Analysis of Transcritical Co2 Refrigeration System for Supermarket Application

Effectiveness Simulation of Internal Heat Exchanger (IHX) Combination Investigation on CO2 Refrigeration

Modelling and Evaluation of the Thermohydraulic Performance of Finned-Tube Supercritical Carbon Dioxide Gas Coolers

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