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Heat and Mass Transfer

, Volume 55, Issue 1, pp 223–234 | Cite as

Investigation on flow condensation of refrigerant in annulus of smooth and enhanced tube-in-tube heat exchanger

  • Jing-xiang Chen
  • Xu Chen
  • Yan He
  • David KukulkaEmail author
  • Wei Li
  • Li Liu
  • Lianxiang Ma
  • Rick Smith
  • Bin Zhang
Short Communication
  • 110 Downloads

Abstract

An experimental investigation of R22 and R410A condensation outside a horizontal smooth tube, a herringbone tube and a newly developed 3D enhanced heat transfer (1EHT) dimple tube has been conducted. The herringbone tube has a fin root diameter of 11.43 mm, a helical angle of 21.3 °, 48 fins with a fin height of 0.262 mm and an apex angle of 36 °; the 1EHT tube has an inner diameter of 11.5 mm with a dimple enhancement; while the smooth tube has an inner diameter of 11.43 mm; and all the tubes have an outer diameter of 12.7 mm. Experiments were performed for a constant saturation temperature of 45°C; with a constant inlet vapor quality of 0.8 and a constant outlet vapor quality of 0.1; for a mass flux ranging from 5 kg/(m2 s) to 250 kg/(m2 s). In addition, annular side condensation experiments were performed using an outer shell tube with outer diameters of 17 mm and 25.4 mm. Heat transfer performance varied with mass flux. At a low mass flux the enhanced dimple tube had the smallest heat transfer coefficient; while at higher values of mass flux, the smooth tube had the smallest heat transfer coefficient. Finally, the effect of average vapor quality on the heat transfer coefficient was also investigated. Characteristic analysis was performed in order to account for the various phenomena found in this series of experiments. Annular side heat transfer performance combined with pressure drop measurements reveal that the herringbone tube generally had a better heat transfer performance than the other tubes, and can be a good choice for use in annular side condensation applications.

Nomenclature

Afr

nominal inside surface area based on fin root diameter, m2

Ai

inner surface area of the tube, m2

Bo

Bond number, g(ρl-ρv)dh2/σ

cpl

constant-pressure specific heat of liquid, J/kg·K

dfr

fin root diameter, m

di

nominal inside diameter to the fin root, m

e

fin height, m

f

friction factor

G

mass velocity based on the actual cross-sectional area, kg/m2s

g

gravitational acceleration, m/s2

h

heat transfer coefficient, W/m2·K

hlv

latent heat of vaporization, J/kg

I

electric current, A

k

thermal conductivity, W/m·K

L

tube length, m

m

mass flow rate, kg.s−1

Nu

Nusselt number, hd/kl

ns

number of starts

p

axial pitch, m

pf

fin pitch normal to the fins, m

Pr

Prandtl number, cplμ/k

Q

heat flow rate, W

q

heat flux based on the total inner surface area, W/m2

Re

Reynolds number

T

temperature, K

tb

fin base thickness, m

u

axial vapor velocity, m/s

V

electric voltage, V

x

vapor quality

Greek symbols

α

apex angle of the fin, deg

β

helix angle, deg

λ

an experimentally determined factor to account for heat losses of the DC and AC heaters through the insulation

μ

dynamic viscosity, Pa·s

ν

specific volume, m3/kg

ρ

density, kg/m3

σ

surface tension, N/m

φ

complementary angle of the helix angle, deg

ψ

inundation angle, degree

Subscripts

ave.

average

exp.

experimental

f

frictional

g

gas

in

inlet

l

liquid

out

outlet

ph

pre-heater

pre

predicted

ref.

refrigerant

sat

saturated

sup

supposed value

t

total value

ts

test section

w

water wall

Notes

Acknowledgements

This work is supported by the National Science Foundation of China (51506104) and National Natural Science Foundation (No. 51676103).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Energy EngineeringZhejiang UniversityHangzhouPeople’s Republic of China
  2. 2.Department of Energy Engineering, Collaborative Innovation Center of Advanced Aero-EngineZhejiang UniversityHangzhouChina
  3. 3.College of Electromechanical EngineeringQingdao University of Science and TechnologyQingdaoChina
  4. 4.Department of Mechanical Engineering TechnologyState University of New York College at BuffaloBuffaloUSA
  5. 5.VipertexBuffaloUSA

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