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Parametric variation studies of experimental flow boiling heat transfer phenomena using R407c inside an enhanced tube

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Abstract

An experimental investigation examines the flow boiling heat transfer phenomena of a vapour compression refrigeration system employing R-407c refrigerant inside a newly configured enhanced horizontally oriented tube with a 20° helix angle and 52° apex angle at ambient pressure. Experiments were conducted on a 1000 mm enhanced tube of copper at saturation temperatures of 15 – 45 °C with input refrigerant heat fluxes of 5—85 kW/m2 and mass fluxes of 100–250 kg/m2s. The heat transfer coefficients for different configurations are obtained and compared with the established correlations for the heat transport phenomena. The experimental Nusselt number defining the convective heat transfer coefficient captured the established correlations with a mean error of 10%. A Nondimensional Jacob number is introduced to signify the sensible heat transfer effects. Local Nusselt varying with location and Jakob subcooling numbers are also introduced. The area ratio is 1.83 for the enhanced tubes concerning the smooth tube specification. Results predicted the 1.45 times enhancement of heat transfer coefficient for the enhanced tubes. Parametric variation is also incorporated to analyse the experimental nature more comprehensively.

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Abbreviations

\(c_{p}\) :

Specific heat capacity, kJ/kgK

\(D_{o}\) :

Outer diameter, mm

\(D_{i}\) :

Inner diameter, mm

\(G\) :

Mass velocity, kg/m2s

\(g\) :

Gravitational acceleration, m/s2

\(h\),\(HTC\) :

Heat transfer coefficient, kW/m2K

\(h_{fg}\) :

Enthalpy of vaporization, kJ/kg

\(I\) :

Current, amp

\(Ja_{sub}\) :

Subcooled Jacob number

\(k\) :

Thermal conductivity, kW/m.K

\(L\) :

Tube length, mm

\(\dot{m}\) :

Mass flow rate, kg/s

\(Nu\) :

Nusselt number

\(P\) :

Pressure, N/m2

\(Q_{p}\) :

Power supplied, kW/m2

\(q\) :

Heat flux, kW/m2

\(R\) :

Desired variable

\(T\) :

Temperature, K

\(U_{R}\) :

Estimated uncertainty

\(U_{{Y_{i} }}\) :

Individual uncertainty

\(V\) :

Voltage, V

\(x\) :

Vapor quality

\(Z\) :

Axial direction, mm

\(\alpha\) :

Apex angle

\(\beta\) :

Helix angle

\(\rho\) :

Density, kg/m3

\(\sigma\) :

Surface tension, N/m

\(\mu\) :

Dynamic viscosity, kg/m.s

\(avg\) :

Average

\(cal\) :

Calculated

\(\exp\) :

Experimental

\(i\) :

Inlet

\(l\) :

Liquid

\(o\) :

Outlet

\(r\) :

Refrigerant

\(s\) :

Surface

\(sat\) :

Saturation

\(sub\) :

Subcooled

\(v\) :

Vapour

\(w\) :

Water

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  1. Department of Mechanical Engineering, National Institute of Technology Agartala, Tripura, 799046, India

    Amit Kumar, Dipak Chandra Das & Pritam Das

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  1. Amit Kumar
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Correspondence to Amit Kumar.

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Kumar, A., Das, D.C. & Das, P. Parametric variation studies of experimental flow boiling heat transfer phenomena using R407c inside an enhanced tube. Heat Mass Transfer 59, 1353–1363 (2023). https://doi.org/10.1007/s00231-023-03343-1

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