Energy analysis of alternative CO 2  refrigeration system configurations for retail food applications in moderate and warm climates

Tsamos, Konstantinos M.; Ge, Y.T.; Santosa, I Dewa Made Cipta; Tassou, S.A.; Bianchi, Giuseppe; Mylona, Zoi

doi:10.1016/j.enconman.2017.03.020

Cited by 111 publications

(41 citation statements)

References 16 publications

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“…This assumption has the same order of magnitude as in some other research works including (Tsamos et al, 2017) and (Lozza et al, 2007). This value is also assumed as 3% of gas cooler design capacity in Pack Calculation Pro software, which compares the annual energy use of different refrigeration systems (IPU, 2017).…”

Section: Energy Efficiency Calculations a Computer Model In Ees (Engisupporting

confidence: 50%

State-of-the-art integrated CO2 refrigeration system for supermarkets: A comparative analysis

Karampour

Sawalha

2018

International Journal of Refrigeration

133

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This paper investigates the integrated and state-of-the art features of CO 2 trans-critical booster systems. The main objective is to identify the most promising solutions in terms of energy efficiency impacts.First, the performance of modified features and integrated functions have been compared with the standard CO2 system and alternative heating and air conditioning solutions. Subsequently, the performance of the defined state-of-the-art CO 2 system is compared to natural refrigerant-based cascade and HFC/HFO-based DX and indirect refrigeration solutions operating in cold and warm climates.The results indicate that two-stage heat recovery, flooded evaporation, parallel compression and integration of air conditioning are the most promising features of the state-of-the-art integrated CO2 system. This compact and environmentally friendly system is the most energy efficient solution in cold climates, and is also an efficient solution in warm climates, with comparable efficiency to cascade and HFC/HFO DX systems, but with no existing or potential limitations.

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Section: Energy Efficiency Calculations a Computer Model In Ees (Engisupporting

confidence: 50%

State-of-the-art integrated CO2 refrigeration system for supermarkets: A comparative analysis

Karampour

Sawalha

2018

International Journal of Refrigeration

133

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“…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). The results obtained show that a CO2 booster system with hot gas bypass can provide the best performance with 5.0% energy savings for warm climates and 3.65% for moderate climates, followed by an integrated cascade of all CO2 systems with gas bypass compressors, with 3, 6% and 2.1% savings on the reference system for each warm and moderate climate.…”

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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“…Tsamos [12] compared the performance between booster system with gas bypass compressor and other design (i.e. cascade system with gas bypass), it was found that the booster system gets 5% energy saving in a warm climate.…”

Section: Introductionmentioning

confidence: 99%

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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Energy analysis of alternative CO 2 refrigeration system configurations for retail food applications in moderate and warm climates

Cited by 111 publications

References 16 publications

State-of-the-art integrated CO2 refrigeration system for supermarkets: A comparative analysis

State-of-the-art integrated CO2 refrigeration system for supermarkets: A comparative analysis

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

Performance Analysis of Transcritical Co2 Refrigeration System for Supermarket Application

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