Abstract
The flow condensation heat transfer performances of NCUR01, composed of R1234ze(E) and R152a by mass ratio 40:60, in horizontal smooth tubes with the inner diameter of 4 mm and 6 mm were investigated experimentally. Condensation heat transfer coefficients were measured in the region of mass flux from 100 to 200 kg m−2 s−1, heat flux from 5 to 10 kW m−2, saturation temperature from 303.15 K to 313.15 K and vapor quality from 0.1 to 1. The influence of mass flux, heat flux, saturation temperature, vapor quality and diameter on condensation heat transfer coefficients were analyzed. Experimental values of condensation heat transfer coefficient of smooth tube were also compared to the predicted values obtained by some well-known existing correlations. The mean absolute deviations of six selected correlations, for the condensation heat transfer coefficient of smooth tube, were estimated to be more than 30%. So, based on experimental data and some dimensionless parameters such as equivalent Reynolds number Reeq, condensation number Co and Bond number Bd, a new correlation was proposed to predict the condensation heat transfer coefficients of NCUR01. The mean absolute deviation of the new correlation is only 15.15% and absolute deviation within 30% occurs in 82% of data predicted by the proposed correlation.
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Abbreviations
- Q :
-
Heat transfer rate (W)
- c p :
-
Specific heat capacity at constant pressure (J kg−1 K−1)
- q :
-
Heat flux (kW m−2)
- q v :
-
Volume flow rate (m3 s−1)
- ρ :
-
Density (kg m−3)
- d :
-
Inside diameter (mm)
- d c :
-
Hydraulic diameter
- D :
-
Outside diameter (mm)
- L ef :
-
Effective length of the test tube (mm)
- G :
-
Mass flux (kW m−2 s−1)
- M :
-
Mass flow rate (kg s−1)
- X :
-
Vapor quality
- Δt m :
-
Mean logarithmic temperature (°C)
- T :
-
Temperature (°C)
- A i :
-
Internal surface area (m2)
- A o :
-
External surface area (m2)
- G :
-
Gravitational acceleration, 9.81 m s−2
- H :
-
Surface heat transfer coefficient (W m−2 K−1)
- R :
-
Single error
- Xi :
-
Factor affecting R
- MRD:
-
The mean relative deviation
- MAD:
-
The mean absolute relative deviation
- N :
-
The number of date point
- P :
-
Pressure (KPa)
- h lv :
-
Latent heat of vaporization (J kg−1)
- Re:
-
Reynolds number
- Xtt:
-
Martinelli number
- Pr:
-
Prandtl number
- Co:
-
Condensation number
- S v :
-
Dimensionless specific volume
- λ c :
-
Thermal conductivity of cooper (W m−2 K−1)
- μ :
-
Dynamic viscosity (Pa s)
- δR :
-
Systematic error
- δx i :
-
Value of the factor affecting R
- σ :
-
Surface tension (N m−1)
- δ :
-
Wall thickness (mm)
- w:
-
Cooling water
- out:
-
Outlet
- in:
-
Inlet
- r:
-
Refrigerant
- s:
-
Saturation
- pred:
-
Prediction results
- exp:
-
Experimental data
- l:
-
Liquid
- c:
-
Critical
- v:
-
Vapor
- eq:
-
Equivalent
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Foundation No.22068024)
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Dai, Y., Xu, C., Qiu, K. et al. Condensation heat transfer of R1234ze(E)/R152a in horizontal tube and development of correlation. J Braz. Soc. Mech. Sci. Eng. 44, 464 (2022). https://doi.org/10.1007/s40430-022-03763-w
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DOI: https://doi.org/10.1007/s40430-022-03763-w