Experimental investigation of gas cooler/condenser designs and effects on a CO 2 booster system

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

doi:10.1016/j.apenergy.2016.03.004

Cited by 29 publications

(12 citation statements)

References 13 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%

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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%

“…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%

Performance Analysis of Transcritical Co2 Refrigeration System for Supermarket Application

Santosa¹

2018

GEOMATE

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“…Impact of tube curvature on buoyancy, natural circulation, pressure drops, charge reduction and fins or foam inside tubes on performance of supercritical CO 2 heat transfer systems . The integration of gas coolers, ejectors, and boosters is under extensive research to increase performance of subcritical, transcritical, and supercritical CO 2 systems for residential, commercial, and industrial applications …”

Section: Sun Powered Co2 Systemsmentioning

confidence: 99%

Review of carbon dioxide (CO ₂ ) based heating and cooling technologies: Past, present, and future outlook

2019

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Summary Refrigerants bearing high global warming potential (GWP) and ozone depletion potential (ODP) were outlawed or facing time‐beared permission under the Montreal (1987), Kyoto (1997) protocols, F‐Gas law (2015), Paris Accord (2016), and recent Kigali Amendment to Montreal Protocol (2019). In order to modify followed by the paradigm shift of existing heating and cooling systems, American Society of Heating, Refrigeration, and Air‐Conditioning Engineers (ASHRAE) envisaged natural and synthetic refrigerants (Synrefs) are under investigation globally. Carbon dioxide (CO2) is a popular natural refrigerant (Natref) replacing Synrefs used in commercial heating, ventilation, air conditioning, and refrigeration (HVAC&R) systems globally. A rampant rise is observed in markets of Asia (Japan and China), North America (the United States and Canada), the Australian continent, and Africa (South Africa) by reaching 20 000 CO2‐stores around the globe. The European markets are leading the utilization of CO2 in the heat pump, and refrigeration, CO2 based markets estimate 14% of the total food retail stores (400 m2). Japan is the second leading market of CO2 heat pump and refrigeration with more than 10 200 CO2 condensing units. CO2 transcritical systems have a share of more than 10% in only European market (large stores); however, their share is less than 10% of total stores in other major markets of the world. New pump and compressor‐driven transcritical CO2 systems integrate ejectors, condensers, and booster systems to reduce energy consumptions, enhance efficiency, efficacy, and coefficient of performance. This article reports a critical review of the CO2 based heating, cooling, and refrigeration system and presents updated literature along with barriers and challenges on commercial use of Natref‐based heating and cooling applications worldwide.

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“…Figure 1 shows the schematic diagram and p-h diagram of R744/R717 CRS (BASE). 45,46 Figure 3 describes the schematic diagram and p-h diagram of R744/R744 CRS assisted with HTC expander (CE). 34,35,44 As illustrated in Figure 1A, BASE consists of HTC compressor, high-pressure heat Figure 1B.…”

Section: System Description and Modelingmentioning

confidence: 99%

Comparative analysis of thermodynamic performance of CO ₂ cascade refrigeration system assisted with expander and mechanical subcooling

Sun

Wang

et al. 2019

Int J Energy Res

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Summary In order to discuss the feasibility of using R744/R744 cascade refrigeration system (CRS) instead of R744/R717 CRS, six configurations of R744/R744 CRS assisted with expander and mechanical subcooling system (MS) are analyzed. Based on the thermodynamic analysis, the results show that the high pressure, the condensing temperature of the low‐temperature cycle (LTC), and the degree of subcooling of LTC and the high‐temperature cycle (HTC) are three important operating parameters with an optimum value corresponding to the maximum coefficient of performance (COP). Compared with other CRSs, CRS with HTC throttling valve and MS of HTC (CTSH) and CRS with HTC expander and MS of HTC (CESH) show an excellent performance. CESH has the highest COP and is improved by an average of 13.8% compared with the COP of R744/R717 CRS. The COP of CTSH is improved by an average of 4.2% compared with the COP of R744/R717 CRS. In conclusion, it is an efficient way to improve performance that CRS combines MS in HTC and HTC expander. And it is possible R744/R744 CRS instead of R744/R717 CRS.

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Experimental investigation of gas cooler/condenser designs and effects on a CO 2 booster system

Cited by 29 publications

References 13 publications

Performance Analysis of Transcritical Co2 Refrigeration System for Supermarket Application

Performance Analysis of Transcritical Co2 Refrigeration System for Supermarket Application

Review of carbon dioxide (CO ₂ ) based heating and cooling technologies: Past, present, and future outlook

Comparative analysis of thermodynamic performance of CO ₂ cascade refrigeration system assisted with expander and mechanical subcooling

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Experimental investigation of gas cooler/condenser designs and effects on a CO 2 booster system

Cited by 29 publications

References 13 publications

Performance Analysis of Transcritical Co2 Refrigeration System for Supermarket Application

Performance Analysis of Transcritical Co2 Refrigeration System for Supermarket Application

Review of carbon dioxide (CO 2 ) based heating and cooling technologies: Past, present, and future outlook

Comparative analysis of thermodynamic performance of CO 2 cascade refrigeration system assisted with expander and mechanical subcooling

Contact Info

Product

Resources

About

Review of carbon dioxide (CO ₂ ) based heating and cooling technologies: Past, present, and future outlook

Comparative analysis of thermodynamic performance of CO ₂ cascade refrigeration system assisted with expander and mechanical subcooling