Heat transfer characteristics of R410A-oil mixture flow boiling inside a 7mm straight smooth tube

Hu, Haitao; Ding, Guifu; Wei, Wenjian; Wang, Zhence; Wang, Kaijian

doi:10.1016/j.expthermflusci.2007.10.003

Cited by 34 publications

(13 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The poor predictability of the Zurcher et al (1998b) correlation may be due to the fact that: 1) it is not enough to attribute the influence of oil presence on heat transfer only to viscosity change, because other properties, such as density, heat conductivity, surface tension, etc., are also important factors that effect the heat transfer coefficient, 2) the databank of the Zurcher (1998b) model comes from large tubes with an inside diameter of 10.92 mm, and this heat transfer model should be modified for small tubes, and 3) the heat transfer model should consider the effect of oil on flow pattern of a R-410A/oil mixture. Figure 6e shows that the deviation of the Hu et al (2008a) correlation is within -40%-50%. The poor predictability of the Hu et al (2008a) correlation may be due to the fact that the databank of this model comes from large tubes with an outside diameter of 7.0 mm.…”

Section: Local Heat Transfer Coefficient Correlations Predictability mentioning

confidence: 91%

“…Figure 6e shows that the deviation of the Hu et al (2008a) correlation is within -40%-50%. The poor predictability of the Hu et al (2008a) correlation may be due to the fact that the databank of this model comes from large tubes with an outside diameter of 7.0 mm. The heat transfer model should be modified for small tubes.…”

Section: Local Heat Transfer Coefficient Correlations Predictability mentioning

confidence: 91%

“…Two-phase heat transfer performances of a R-410A/oil mixture flow boiling inside horizontal tubes have been reported by Hu et al (2008a and2008b). The tube diameters in the above studies are larger than 6 mm.…”

Section: Introductionmentioning

confidence: 87%

“…The third category is different from the first two and is developed based on refrigerant-oil mixture properties (Hu et al 2008a;Wei et al 2007b;Hambraeus 1995;Zurcher et al 1998b). The mixture properties are used to replace the pure refrigerant properties to address oil influence on heat transfer.…”

Section: Local Heat Transfer Coefficient Correlations Predictability mentioning

confidence: 99%

“…The local vapor quality of a refrigerant-oil mixture is based on the total weight of the refrigerant-oil mixture and is calculated by using the enthalpy of the refrigerant-oil mixture (Hu et al 2008a). …”

Section: Local Vapor Qualitymentioning

confidence: 99%

See 4 more Smart Citations

Measurement and Correlation of Flow-Boiling Heat Transfer of a R-410A/Oil Mixture Inside a 4.18 mm Straight Smooth Tube

Hu¹,

Ding²,

Huang

et al. 2009

HVAC&R Research

Self Cite

View full text Add to dashboard Cite

Two-phase flow patterns and heat transfer characteristics of a R-410A/oil mixture flow boiling inside a horizontal straight smooth tube with the inside diameter of 4.18 mm were investigated experimentally. The flow pattern observations for a R-410A/oil mixture match well with the flow pattern map of Wojtan et al. (2005) by using the refrigerant-oil properties instead of pure-refrigerant properties. The test results show that the heat transfer coefficient of a R-410A/oil mixture increases with mass flux of a refrigerant-oil mixture; the presence of oil enhances the heat transfer by a maximum of 60% at the range of low and intermediate vapor qualities. There is a peak of local heat transfer coefficient at about 2%-5% nominal oil concentration at higher vapor qualities, and the peak shifts to lower nominal oil concentration with the increase of vapor qualities. Higher nominal oil concentration gives a more detrimental effect at high vapor qualities. A new correlation to predict the local heat transfer of a R-410A

show abstract

Section: Local Heat Transfer Coefficient Correlations Predictability mentioning

confidence: 91%

Section: Local Heat Transfer Coefficient Correlations Predictability mentioning

confidence: 91%

Section: Introductionmentioning

confidence: 87%

Section: Local Heat Transfer Coefficient Correlations Predictability mentioning

confidence: 99%

Section: Local Vapor Qualitymentioning

confidence: 99%

See 3 more Smart Citations

Measurement and Correlation of Flow-Boiling Heat Transfer of a R-410A/Oil Mixture Inside a 4.18 mm Straight Smooth Tube

Hu¹,

Ding²,

Huang

et al. 2009

HVAC&R Research

Self Cite

View full text Add to dashboard Cite

show abstract

Boiling heat transfer coefficient of R22 and an HFC/HC refrigerant mixture in a fin‐and‐tube evaporator of a window air conditioner

Raj

Lal

2010

Heat Trans. Asian Res.

View full text Add to dashboard Cite

The commonly used refrigerant in unitary type air conditioners is R22 and its phase out schedule in developing countries is to commence from 2015. Many alternatives to R22 are found in published literature in which R407C has similar characteristics to those of R22 except for its zeotropic nature. However, R407C which is an HFC is made compatible with the mineral oil lubricant in the system compressor by the addition of 20% of HC. This HFC/HC mixture called the M20 refrigerant mixture is reported to be a retrofit refrigerant for R22. Though its latent heat value is greater than that of R22, its refrigerating capacity is lower when it is used to retrofit R22 window air conditioners. Hence, a heat transfer analysis was conducted in the evaporator of a room air conditioner, for practically realized heat flux conditions during standard performance testing. The tests were conducted as per the BIS and ASHRAE standards. Kattan-Thome-Favrat maps are used to confirm the flow patterns, which prevail inside the fin-and-tube evaporator in the tested operating conditions. It is revealed that the heat transfer coefficient/heat fluxes are poorer for M20 because of the lower mass flow rate and higher vapor fraction at the entry of the evaporator than that of R22 in the prevailing operating conditions. The heat transfer coefficients of the M20 refrigerant mixture under various test conditions are lower in the range of 14% to 56% than those of R22.

show abstract

Flow Maps in the Boiling Process in Domestic Refrigerators

Toapanta-Ramos

Nieto-Londoño

Suquillo-Goméz

et al. 2021

Communication, Smart Technologies and Innovation for Society

View full text Add to dashboard Cite

Heat transfer characteristics of R410A-oil mixture flow boiling inside a 7mm straight smooth tube

Cited by 34 publications

References 28 publications

Measurement and Correlation of Flow-Boiling Heat Transfer of a R-410A/Oil Mixture Inside a 4.18 mm Straight Smooth Tube

Measurement and Correlation of Flow-Boiling Heat Transfer of a R-410A/Oil Mixture Inside a 4.18 mm Straight Smooth Tube

Boiling heat transfer coefficient of R22 and an HFC/HC refrigerant mixture in a fin‐and‐tube evaporator of a window air conditioner

Flow Maps in the Boiling Process in Domestic Refrigerators

Contact Info

Product

Resources

About