Performance Analysis of Transcritical Co2 Refrigeration System for Supermarket Application

Santosa, I Dewa Made Cipta

doi:10.21660/2018.50.ijcst1

Cited by 9 publications

(6 citation statements)

References 14 publications

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“…Compared to standard designs (without internal heat exchangers) that have been studied previously, the design consists of 14 state points [2,13] with sub cooled degrees in the saturated position (without sub-cooled). Previous studies also show that sub cooling degrees are very significant to improve the performance of CO2 refrigeration systems up to 30% [9][10][11].…”

Section: Resultsmentioning

confidence: 99%

“…It is found that COP varies with ambient temperature and work pressure, the higher the external environment temperature, the lower the COP, so it is very clear that application to high temperature environments requires design modifications to increase the COP of the system [2]. Tsamos et al [3] examined several system configurations to be tested at ambient temperatures (warm climate).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

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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“…With annual leak rates up-to 30%, HFC systems release greenhouse gases that deplete stratospheric ozone (Besher et al, 2015). CO 2 has a much lower GWP than HFC, so is the preferred refrigerant for retail in terms of net zero goals (Santosa et al, 2018;Dilshad et al, 2019;Efstratiadi et al, 2019;Yu et al, 2019). However, CO 2 -based systems are less efficient than HFC systems in hot climates (Fricke et al, 2019), implying a trade-off between the implications for net zero goals and climate mitigation, and for climate adaptation.…”

Section: Implications Of Adaptation Measures For Net Zeromentioning

confidence: 99%

Climate Science, Solutions and Services for Net Zero, Climate-Resilient Food Systems

2024

Frontiers Research Topics

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Frontiers is more than just an open access publisher of scholarly articles: it is a pioneering approach to the world of academia, radically improving the way scholarly research is managed. The grand vision of Frontiers is a world where all people have an equal opportunity to seek, share and generate knowledge. Frontiers provides immediate and permanent online open access to all its publications, but this alone is not enough to realize our grand goals. Frontiers journal seriesThe Frontiers journal series is a multi-tier and interdisciplinary set of openaccess, online journals, promising a paradigm shift from the current review, selection and dissemination processes in academic publishing. All Frontiers journals are driven by researchers for researchers; therefore, they constitute a service to the scholarly community. At the same time, the Frontiers journal series operates on a revolutionary invention, the tiered publishing system, initially addressing specific communities of scholars, and gradually climbing up to broader public understanding, thus serving the interests of the lay society, too. Dedication to qualityEach Frontiers article is a landmark of the highest quality, thanks to genuinely collaborative interactions between authors and review editors, who include some of the world's best academicians. Research must be certified by peers before entering a stream of knowledge that may eventually reach the public -and shape society; therefore, Frontiers only applies the most rigorous and unbiased reviews. Frontiers revolutionizes research publishing by freely delivering the most outstanding research, evaluated with no bias from both the academic and social point of view. By applying the most advanced information technologies, Frontiers is catapulting scholarly publishing into a new generation. What are Frontiers Research Topics?Frontiers Research Topics are very popular trademarks of the Frontiers journals series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area.

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“…Refrigeration system has developed both in term of component development and in term of being environmentally friendly, since the refrigeration system contribute to increased CO2 levels in atmosphere and can also damage the ozone which protects earth living from dangerous radiation of the sun shine [1,2]. However, natural refrigerant such as carbon dioxide (CO2-R744) is certainly excellent for the environment friendly but at present it still has several weaknesses, especially in term of high-pressure safety and efficiency of the system [3], so that investment and operation are still more expensive being compared with the conventional refrigerant such as, R134a, R600a.…”

Section: Introductionmentioning

confidence: 99%

CFD Air Flow Evaluation of Finned Tube Evaporator for Refrigerated Display Cabinet Application

I Dewa Made Cipta Santosa,

I Gede Nyoman Suta Waisnawa,

Putu Wijaya Sunu

et al. 2024

CFDL

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This study is aimed to develop a simulation to improve the performance of the finned tube evaporator which is applied to the refrigerated display cabinet. CFD model was developed to be able to analyse the characteristics of air flow inside the fin gap and air side heat transfer coefficient. Geometry of the model of overall finned tube evaporator is considered covering two aluminium wavy fins with an air flow in between, combination of staggered cooper tubes with refrigerant flow inside. Fin gap is designed 4 mm to anticipate frost on the fin surface that can block air flow. Turbulence models used in the study is the realizable k-ε turbulence which had the best performance turbulence model and it was validated with secondary data from previous studies and shows the lowest error only 5.9 %. The use of CFD was found to be sufficiently representative of the heat transfer characteristics of evaporators, and acted as an effective simulation tool to determine the heat transfer coefficient in order to improve efficiency in terms of improved design. The characteristics of air flow between the fin gap and around the tube was obtained various and complex. In the case study the entry velocity of 1.7 m /s at the highest turbulence condition of the first row can reach speeds of 2.75 m/s. Hight turbulence regime in flow can indicate higher the heat transfer coefficient of the evaporator.

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Performance Analysis of Transcritical Co2 Refrigeration System for Supermarket Application

Cited by 9 publications

References 14 publications

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

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

Climate Science, Solutions and Services for Net Zero, Climate-Resilient Food Systems

CFD Air Flow Evaluation of Finned Tube Evaporator for Refrigerated Display Cabinet Application

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