Development of a continuous empirical correlation for refrigerant mass flow rate through non-adiabatic capillary tubes

Rasti, Mehdi; Ban, J H; Jeong, Ji Hwan

doi:10.1016/j.applthermaleng.2017.08.070

Cited by 18 publications

(1 citation statement)

References 20 publications

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“…The diffrences of density will affect on the pressure that occurs in the compressor. Because the relationship between pressure and density is directly proportional, so the change of density will be affect in a change in pressure, and conversely [15]. The graph above shown that the data pressure for each mixing ratio at the pressure point from P1 to P4 has a different pressure.…”

Section: Methodsmentioning

confidence: 93%

Effect of Hydrogen (g) Mixture with Refrigerant on the Pressure of Cooling Machine Components

Praswanto,

Djiwo,

Asroni

et al. 2021

j. of sci. and appl.eng.

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Refrigerant is substance or chemical composition which alternately compressed and condensed into a liquid and then expanded into vapor or gas when pumped through the cooling system. Alternative refrigerants are needed to replace full the halogenated refrigerants which are believed to contribute to ozone depletion in the atmosphere. In the last decade, many research and development of studies on the synthesis and characterization alternative refrigerants have been carried out. With replace a limited Ozone Depleting Substance (ODS) with any alternative can involve major changes in the design of various components such as insulation, lubricants, heat exchangers and motors. The purpose of this research is to determine the effect of hydrogen mixture with refrigerant R134a on the pressure of each component. This research used an experimental method on a direct cooling device. The data which obtained from the experimental results on this cooling machine then will process to determine the pressure that occurs in each component of the cooling machine. Based on the results of this research, the effect of the hydrogen mixture on refrigerant R134a on the performance of the cooling machine is the differences density of each mixture ratio. If more of hydrogen additions there, the density of result mixture also getting smaller. This will affect the pressure that occurs in the compressor because the relationship between density and pressure is directly proportional. The conclusion is the refrigerant from a mixture of hydrogen gas and Freon R134a is suitable for use as a refrigerant for air condition. Because at 60 minutes, the mixture ratio of 85%:15% can reduce the water temperature slowly until 20.2ÂºC. The slow cooling is felt bad when applied on the food preservation.Â

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Section: Methodsmentioning

confidence: 93%

Effect of Hydrogen (g) Mixture with Refrigerant on the Pressure of Cooling Machine Components

Praswanto,

Djiwo,

Asroni

et al. 2021

j. of sci. and appl.eng.

View full text Add to dashboard Cite

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Prediction of steady-state two-phase flow of nitrogen + extinguishant in the pipeline and a correlation for mass flow rate

Liu

Xie

Chen

et al. 2021

J Therm Anal Calorim

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Nitrogen used for pressurization of a fire extinguisher could be partially dissolved in the fire extinguishing agent, forming a binary mixture accompanied by a phase change while flowing inside the pipeline. Notwithstanding the widespread use of fire extinguishing system, an effective method has never been considered to predict two-phase flow performance of nitrogen + extinguishant in the pipeline. This paper presents investigation of the steady-state two-phase flow of extinguishant in the pipeline, including C3HF7 (HFC227ea), CF3I, and C2HF5 (HFC125). The average viscosity of mixture was calculated using six quoted methods (VM-1 to VM-6).Subsequently, inspired by one-dimensional adiabatic isenthalpic flow of refrigerant in a capillary tube, the corresponding prediction models (STFM-1 to STFM-6) for large mass flux nitrogen + extinguishant in a fire extinguishing pipeline were developed based on the VM-1 to VM-6. In comparison with previous experimental and theoretical data, the applicability and accuracy of the proposed mathematical models was examined from two different aspects, mass flow rate and pressure drop. The results indicated that both models, STFM-2 and STFM-3, predicted accurately for mass flow rate, and STFM-2 model predicted accurately for pressure drop. Finally, new correlations for mass flow rate and pressure drop have been established accurately based on summarizing the relevant predicted data, respectively. This work contributes to a good theoretical approach on the analysis of two-phase flow of nitrogen + extinguishant. Keywords: steady-state two-phase flow; adiabatic isenthalpic expansion; average viscosity; mass flow rate; pressure drop Nomenclature T' presumptive temperature r' parameter of the PRμ model defined in Eq. (5) p pressure, Pa μ dynamic viscosity, 10 -7 Pa•s

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A generalized continuous empirical correlation for predicting refrigerant mass flow rates through adiabatic capillary tubes

Rasti

Jeong

2018

Applied Thermal Engineering

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Development of a continuous empirical correlation for refrigerant mass flow rate through non-adiabatic capillary tubes

Cited by 18 publications

References 20 publications

Effect of Hydrogen (g) Mixture with Refrigerant on the Pressure of Cooling Machine Components

Effect of Hydrogen (g) Mixture with Refrigerant on the Pressure of Cooling Machine Components

Prediction of steady-state two-phase flow of nitrogen + extinguishant in the pipeline and a correlation for mass flow rate

A generalized continuous empirical correlation for predicting refrigerant mass flow rates through adiabatic capillary tubes

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