Condensation heat transfer and pressure drop of R-134a saturated vapour inside a brazed compact plate fin heat exchanger with serrated fin

This paper presents the experimental heat transfer coefficient and pressure drop measured during R-134a saturated vapour condensation inside a small brazed compact plate fin heat exchanger with serrated fin surface. The effects of saturation temperature (pressure), refrigerant mass flux, refrigerant...

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Bibliographic Details
Published in:Heat and mass transfer 2017, Vol.53 (1), p.331-341
Main Authors: Ramana Murthy, K. V., Ranganayakulu, C., Ashok Babu, T. P.
Format: Article
Language:English
Subjects:
Coefficient of friction
Condensation
Correlation analysis
Dependence
Engineering
Engineering Thermodynamics
Forced convection
Heat and Mass Transfer
Heat exchangers
Heat flux
Heat transfer
Heat transfer coefficients
Industrial Chemistry/Chemical Engineering
Kinetic energy
Original
Plate-fin heat exchangers
Pressure drop
Pressure effects
Product testing
Refrigerants
Saturation
Sensitivity
Simulation
Surface properties
Thermodynamics
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Summary:This paper presents the experimental heat transfer coefficient and pressure drop measured during R-134a saturated vapour condensation inside a small brazed compact plate fin heat exchanger with serrated fin surface. The effects of saturation temperature (pressure), refrigerant mass flux, refrigerant heat flux, effect of fin surface characteristics and fluid properties are investigated. The average condensation heat transfer coefficients and frictional pressure drops were determined experimentally for refrigerant R-134a at five different saturated temperatures (34, 38, 40, 42 and 44 °C). A transition point between gravity controlled and forced convection condensation has been found for a refrigerant mass flux around 22 kg/m 2 s. In the forced convection condensation region, the heat transfer coefficients show a three times increase and 1.5 times increase in frictional pressure drop for a doubling of the refrigerant mass flux. The heat transfer coefficients show weak sensitivity to saturation temperature (Pressure) and great sensitivity to refrigerant mass flux and fluid properties. The frictional pressure drop shows a linear dependence on the kinetic energy per unit volume of the refrigerant flow. Correlations are provided for the measured heat transfer coefficients and frictional pressure drops.
ISSN:0947-7411
1432-1181
DOI:10.1007/s00231-016-1827-0