Predicting off-design range and performance of refrigeration cycle with two-stage centrifugal compressor and flash intercooler

Turunen-Saaresti, Teemu; Röyttä, Pekka; Honkatukia, Juha; Backman, Jari

doi:10.1016/j.ijrefrig.2010.04.008

Cited by 18 publications

(7 citation statements)

References 11 publications

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“…Zehnder et al [8] 은 저온 의 외기온도에서 고온수를 얻기 위한 이코너마이 저 적용 인젝션 사이클에 대한 연구를 통해 28%와 15%의 용량 및 COP 향상 결과를 얻었다. TurunenSaaresti et al [9] 은 [10] 와 NR GT 101 [11] 의 표준조 건과 고온수 운전 조건 구현 및 성능 측정과 정확 이코너마이저를 적용한 경우에 압축기 출구 및 입구의 시스템 고압 및 저압은 이코너마이저를 적용하지 않은 경우에 비하여 다소 높게 나타났 다 (Fig. 2, 5, 6) 하지만, 이코너마이저를 적용한 경우에 시스템의 냉매 유량이 이코너마이저를 적 용하지 않은 경우에 비하여 커서 압축기 소비전 력은 이코너마이저를 적용한 시스템이 크게 나타 났다 (Fig.…”

Section: 서 론unclassified

The Effect of Load Variation on the Performance of an Injection Heat Pump with an Economizer

Choi¹,

Park²,

Kang

2014

Transactions of the Korea Society of Geothermal Energy Engineer

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Heat pumps have received a fair amount of attention all over the world for their high efficiency and low environmental impact. Employing heat pumps for residential heating and cooling produces only about 2038 kg-CO2/year, an amount which is less than half that of conventional boiler systems. However, the use of single-stage heat pumps becomes uneconomical when they are operated at very low evaporating temperature or high condensing temperature. Two-stage heat pumps systems can be used successfully for low or high temperature applications. In this paper, the experimental study on the performance of two-stage heat pump with an economizer was executed in heating mode. When the secondary fluid inlet temperature to the indoor heat exchanger increased, the COP enhancement rate of two-stage heat pump with an economizer was increased. For all outdoor inlet temperature conditions, the performance of the heat pump with an economizer was higher than it without an economizer.

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Section: 서 론unclassified

The Effect of Load Variation on the Performance of an Injection Heat Pump with an Economizer

Choi¹,

Park²,

Kang

2014

Transactions of the Korea Society of Geothermal Energy Engineer

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“…In this study, instead of simulating the whole multi-stage compressor, CFD numerical methods are used to predict one single counter rotating stage's performance. When multi-stages' performance maps are combined together, the generated map would be shorter according to the study from Saaresti (Turunen-Saaresti et al, 2010). In this investigation, the performance curves of a single stage will be mapped and losses from leakage between shroud and chamber wall are also considered in this simulation; based on the maps, potentials and challenges of utilizing this counter rotating novel impeller to compress water vapor as refrigerant are discussed and it provides important information for multi-stage study in the future.…”

Section: Compressor Cfd Modelmentioning

confidence: 99%

Thermodynamic potential of using a counter rotating novel axial impeller to compress water vapor as refrigerant

Piechna

Müller

2011

International Journal of Refrigeration

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“…[11][12][13][14] For large or middle power compressors, one of the most important ways to save energy is using multistage compression and intercooling. [15][16][17][18][19] The air compressed part ways to the discharge pressure, passed through an intercooler, and then compressed further. To minimize specific work input or power consumption, in two-stage air compression with 100% isentropic efficiency and 100% intercooler effectiveness, is readily seen to require that the stage pressure ratio rise should be the square root of overall pressure ratio in the more restrictive perfect gas model.…”

Section: Introductionmentioning

confidence: 99%

Modeling and optimization of industrial multistage compressed air system using actual variable effectiveness in hot regions

Azizifar

Banooni

2016

Advances in Mechanical Engineering

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In this article, modeling and optimization of power consumption of two-stage compressed air system have been investigated. To do so, the two-stage compressed air cycle with intercooler of Fajr Petrochemical Company was considered. This cycle includes two centrifugal compressors, a shell, and a tube intercooler. For modeling of power consumption, isentropic efficiencies of actual compressors and thermal effectiveness of intercooler are calculated from experimental data. In these equations, isentropic efficiency of compressors is a function of the inlet temperature, and thermal effectiveness of the intercooler is a function of the inlet air temperature, inlet water temperature of the intercooler, and inlet volumetric flow rate of the cycle. For optimization of power consumption, the Lagrangian method is used. Power consumption and isentropic efficiency of the first-and second-stage compressors, thermal effectiveness of the intercooler, and entropy generation of compressors are considered as the objective function and optimization conditions, respectively. In comparison with the experimental data, the modeling provided suitable accuracy. The optimization effectively reduced the power consumption of the cycle, especially in summer, in a way that the minimum and maximum reductions were 2.9% and 9.6%, respectively.

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Predicting off-design range and performance of refrigeration cycle with two-stage centrifugal compressor and flash intercooler

Cited by 18 publications

References 11 publications

The Effect of Load Variation on the Performance of an Injection Heat Pump with an Economizer

The Effect of Load Variation on the Performance of an Injection Heat Pump with an Economizer

Thermodynamic potential of using a counter rotating novel axial impeller to compress water vapor as refrigerant

Modeling and optimization of industrial multistage compressed air system using actual variable effectiveness in hot regions

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