A model to predict R134a refrigerant leakage through the radial clearance of rolling piston compressors

Gasche, José Luiz; Andreotti, Thiago; Maia, Cássio Roberto Macedo

doi:10.1016/j.ijrefrig.2012.07.015

Cited by 29 publications

(13 citation statements)

References 4 publications

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“…Refrigerant leakage is a serious source of emissions in the case of the household air conditioning systems. The refrigerant leakage has a direct impact on global warming 16,17) .…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, thermodynamic properties of R32, R134a and R410a are different. Hence, coefficient of performance (COP), leakage rate, and other important parameters are also different which have a significant impact on TEWI 4,17,18) . According to these reports, we calculate the total equivalent warming impact for R134a, R32 and R410A refrigerants, respectively.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Assessment of Environmental Impact for Air-Conditioning Systems in Japan Using HFC Based Refrigerants

Kibria¹,

Islam²,

Saha³

et al. 2019

Evergreen

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Airconditioning system notably contributes to global warming owing to the huge amount of energy consumption. Moreover, this system uses HFC based refrigerants, which have high global warming potential (GWP). This work investigates the direct and indirect impacts of GWP for commercial and residential airconditioning systems considering the three widely used HFC based refrigerants. The warming impacts are assessed in terms of cooling load, coefficient of performance (COP), evaporation temperature, and condensation temperature for three different locations in Japan. The indirect emission of the airconditioning systems (commercial and residential) for different major cities of Japan is estimated in terms of energy demand and hours of operation. The results of this work indicate that the HFC based refrigerants such as R134a and R32 have lower warming impact compared to that of R410A refrigerant. Furthermore, the economic loss due to refrigerant leakage is also assessed.

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“…Refrigerant leakage is a serious source of emissions in the case of the household air conditioning systems. The refrigerant leakage has a direct impact on global warming 16,17) .…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of Environmental Impact for Air-Conditioning Systems in Japan Using HFC Based Refrigerants

Kibria¹,

Islam²,

Saha³

et al. 2019

Evergreen

View full text Add to dashboard Cite

show abstract

“…Rolling piston compressors (RPC) or often referred more generally as stationary vane compressors are mainly applied in low capacity (< 2 kW) household refrigerator, air-conditioning (AC) and heat pump units [1,2]. The widespread interest in the use of the RPCs in small AC's from the early 1970's is the consequence of their high efficiency, compact size, simple construction and smoother and more quiet operation compared to the reciprocating compressors [3][4][5]. Because of the advantageous attributes, the RPC's were considered to be suitable for various other purposes beside the utilization in residential climatization applications.…”

Section: Introductionmentioning

confidence: 99%

Transient 3D CFD Simulation of a Stationary Vane, Oil Free, Rotary Compressor

Farkas

Suda

2019

Period. Polytech. Mech. Eng.

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The evaluation of a newly designed oil-free rotary compressor is presented based on transient 3D Computational Fluid Dynamics (CFD) simulations. The simulations are performed at low compression ratios and low pressure ratios and low rotational speeds. To place the results into context, the data presented in related literature was processed and summarized. The methods related to the CFD model of the newly designed compressor were developed, summarized and evaluated. The accessed CFD data are in good agreement with the results of the former rolling piston compressor related investigations. The oil free operation prevents the contamination of the working fluid from lubricant. Since the compressor is planned to work in open cycle within the sensitive environment of thermal heat sources contamination free operation has to be accomplished. However, oil-free operation also results in significantly lower performance based on the modelling results.

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“…One of the crucial parts in case of volumetric compressor simulations is how the clearance flows are implemented into the model. Several studies [13][14][15] Figure 4. Vane driving mechanism of the parallel compressor unit (on the left) and the simplified AMESim model of the linkage system (on the right).…”

Section: Introduction To Leakage Flow Modelingmentioning

confidence: 99%

Performance analysis of a novel oil-free rotary compressor

Farkas

Suda

2018

Proceedings of the Institution of Mechanical Engineers, Part A:

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A novel rotating piston-type compressor is presented. The conventional rolling piston architecture was redesigned to allow oil-free operation. The spring activated vane was replaced by a directly driven swinging vane to provide constant contact to the rotating piston. The model of the compressor was implemented in the AMESim simulation platform. Experiments were conducted on prototypes and the data were evaluated based on the simulation results. Directly unobservable geometric dimensions were estimated by adjusting the mathematical model parameters to the measured thermodynamic state variables with the use of a multi-parametric genetic algorithm. The simple genetic algorithm proved fast and adequate solutions. According to the collected results, the oil-free rotating piston architecture is significantly more sensitive to the sealing clearances compared to the conventional oil lubricated rolling piston compressors. Therefore, the theoretically estimated performance can only be achieved with extremely small manufacturing tolerances, which has to be maintained during the operation.

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A model to predict R134a refrigerant leakage through the radial clearance of rolling piston compressors

Cited by 29 publications

References 4 publications

Assessment of Environmental Impact for Air-Conditioning Systems in Japan Using HFC Based Refrigerants

Assessment of Environmental Impact for Air-Conditioning Systems in Japan Using HFC Based Refrigerants

Transient 3D CFD Simulation of a Stationary Vane, Oil Free, Rotary Compressor

Performance analysis of a novel oil-free rotary compressor

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