Experiment and simulation on the performance of an autocascade refrigeration system using carbon dioxide as a refrigerant

Kim, S.G; Kim, M.S

doi:10.1016/s0140-7007(01)00110-4

Cited by 111 publications

(24 citation statements)

References 3 publications

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“…However, air source heat pumps with rotary compressors will face dramatically degradation as applied in cold regions [1]. Aimed at this problems, considerable research has been carried out and a series of solutions, including economizer technology [2], have been raised. At present, the economizer technology has proved an important technical solution to avoid the rapid performance degradation of heat pump in cold regions [3][4].…”

Section: Introductionmentioning

confidence: 99%

A novel vapor injection structure on the blade of a rotary compressor

Liu

Wang

Shi

et al. 2016

Applied Thermal Engineering

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Heat pumps with rotary compressors operating in low temperature ambient will face heavy performance degradation. A novel vapor injection structure on the blade for the rotary compressor has been proposed in this paper to overcome the back-flowing drawback of the traditional cylinder injection structure and enlarge the injection area. Based on a verified numerical model, the performance of a rotary compressor with the blade injection structure has been investigated. The results indicate that: the proposed vapor injection structure can eliminate the back-flowing of the injected refrigerant; compared to the traditional injection structure, the new structure can enhance the volumetric efficiency and injection mass flow-rate by 1.8~2.7% and 26.6~57.2%, respectively; and compared to the traditional injection structure, the new structure can increase the heating capacity and COP by 23.1~48.9% and 3.2~8.0%, respectively.

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Section: Introductionmentioning

confidence: 99%

A novel vapor injection structure on the blade of a rotary compressor

Liu

Wang

Shi

et al. 2016

Applied Thermal Engineering

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“…Inagaki et al (1997) found that, for a two-stage CO 2 air-conditioning cycle, capacity and COP are improved by 35 and 20 %, respectively, at moderate ambient temperature and by 10 and 5 %, respectively, at high ambient temperature. Halozan and Rieber (2000) and Kim and Kim (2002) studied the performance of an auto-cascade refrigeration cycle using CO 2 as a working fluid. Huff et al (2002) compared the performance of a two-stage CO 2 cycle with that of a conventional one by means of a simplified model.…”

Section: Introductionmentioning

confidence: 99%

An experimental study on charge optimization of a trans-critical CO2 cycle

Aprea

Greco

Maiorino

2014

Int. J. Environ. Sci. Technol.

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The phasing out of hydrochlorofluorocarbon and chlorofluorocarbon fluids and further environmental problems arising from new, synthetic working fluids stimulate a continuously rising interest on natural candidates. The nontoxic and nonflammable CO 2 impacts neither on ozone depletion nor on global warming if leaked to the atmosphere. The critical temperature of CO 2 (31.1°C) is almost ambient and, therefore, it undergoes a transcritical refrigeration cycle. In cooling mode operation, a trans-critical CO 2 system, as compared to conventional airconditioners, has a lower performance which, contrary to conventional systems, strongly depends on the refrigerant charge. In this paper, the performance of the trans-critical system was evaluated experimentally under different refrigerant charge amounts. The influence of charge on coefficient of performance (COP), cooling capacity, compression ratio, suction line superheat was analyzed in detail. The experimental results indicate that the COP of the trans-critical cycle attains a maximum at optimal refrigerant charge. By varying the charge the cooling capacity attains a maximum, as well, that corresponds to the optimal charge. In order to understand the effect of refrigerant charge on the performance of each device of the plant, an exergetic analysis based on the experimental data was carried out. The analysis shows that the exergy flow destroyed in the compressor is one of the major causes of overall exergy destruction. At the optimal refrigerant charge, the compression losses attain a minimum.

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“…Some of the generally used refrigerants are ammonia, sulphur dioxide and propane (non-halogenated hydrocarbon). The best refrigerant [22][23][24][25] exhibits a positive thermodynamic nature, with features like [26,27],  Non-corrosive to mechanical parts  Should be safe [28]  Free from toxicity and flammability  Does not cause ozone depletion [29]  Does not cause changes in climate [30] As many fluids possess the required qualities and behaviour in various aspects, the selection of liquids is an issue of substitution.…”

Section: Refrigerantmentioning

confidence: 99%

Display Water Cooler

Kasuba¹,

Kalva²,

Kumar³

et al. 2017

SIJST

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Industries, colleges, restaurants, etc., includes canteens which use refrigerators, water coolers and air conditioners to generate heat during the process of refrigeration. This heat energy is usually wasted. But in this project, we have utilized this heat, to heat the water without an external source of power. The purpose of the project is that, the heated water can be utilized to wash hands and clean utensils in the canteens. Heating the water involves many types of sources like electric heaters, fire, etc. In this project, we use a water-cooled condenser as a heating source to heat the water. During the compression phase of the refrigerant, the refrigerant delivers large amount of heat. This heat is utilized and made as an external water-cooled condenser with a refrigerant coil in the refrigerator along with an air-cooled condenser as a sub-cooler. During this process of refrigeration, only the compressed refrigerant transfers the heat to the water, saves power and thereby produces hot water that finds it to have a good temperature sufficient enough to kill bacteria present in hand and also to wash the utensils in the canteens.

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Experiment and simulation on the performance of an autocascade refrigeration system using carbon dioxide as a refrigerant

Cited by 111 publications

References 3 publications

A novel vapor injection structure on the blade of a rotary compressor

A novel vapor injection structure on the blade of a rotary compressor

An experimental study on charge optimization of a trans-critical CO2 cycle

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