Simulation of Transcritical CO<sub>2</sub> Refrigeration System with Booster Hot Gas Bypass in Tropical Climate

Santosa, I Dewa Made Cipta; Sudirman,; Waisnawa, I Gede Nyoman Suta; Sunu, Putu Wijaya; Temaja, I Wayan

doi:10.1088/1742-6596/953/1/012044

Cited by 5 publications

(2 citation statements)

References 11 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%

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%

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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“…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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Exploring refrigeration system performance with solar-powered mechanical porous sub-cooling

Tarawneh,

AL-Shorman,

Yaseen

2024

J Therm Anal Calorim

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Simulation of Transcritical CO₂ Refrigeration System with Booster Hot Gas Bypass in Tropical Climate

Cited by 5 publications

References 11 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

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

Exploring refrigeration system performance with solar-powered mechanical porous sub-cooling

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Simulation of Transcritical CO2 Refrigeration System with Booster Hot Gas Bypass in Tropical Climate

Cited by 5 publications

References 11 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

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

Exploring refrigeration system performance with solar-powered mechanical porous sub-cooling

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Product

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Simulation of Transcritical CO₂ Refrigeration System with Booster Hot Gas Bypass in Tropical Climate