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Heat and Mass Transfer

, Volume 44, Issue 4, pp 437–444 | Cite as

Heat and mass transfer characteristics of a horizontal tube falling film absorber with small diameter tubes

  • Jung-In YoonEmail author
  • Thanh Tong Phan
  • Choon-Geun Moon
  • Ho-Saeng Lee
  • Seok-Kwon Jeong
Original

Abstract

This paper presents experimental results of the heat and mass transfer characteristics of a water–LiBr horizontal tube absorber made of small diameter tubes. The experimental set up includes a tube absorber, a generator, solution distribution system and cooling water system. Three different tube diameters of 15.88, 12.70 and 9.52 mm have been installed inside the absorber to investigate the effect of the tube diameter on the absorber performance. The experimental results show that the heat and mass transfer performance of the absorber increases as the tube diameter decreases. A comparison of the heat and mass transfer coefficients of the present study agree reasonable well with that of the previous studies.

Keywords

Transfer Coefficient Heat Transfer Coefficient Cooling Water Mass Flux Mass Transfer Coefficient 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

A

heat transfer area (m2)

C

LiBr concentration (wt%)

cp

specific heat at constant pressure (J/kg K)

d

tube diameter (m)

h

heat transfer coefficient (W/m2 K)

hmass

mass transfer coefficient (m/s)

k

thermal conductivity (W/m K)

L

tube length (m)

M

mass flow rate (kg/s)

Nu

Nusselt number

n

number of tube

OD

outer diameter (m)

Pr

Prandtl number

Q

heat transfer rate (W)

Re

Reynolds number

T

temperature (K)

U

overall heat transfer coefficient (W/m−2 K)

u

velocity (m/s)

Greek letters

μ

dynamic viscosity (kg/m s)

ν

kinematic viscosity (m2/s)

ρ

density (kg/m3)

Γ

liquid mass flow rate per unit width (kg/m s)

Subscripts

c

cooling water

i, in

inside

in

Inlet

lm

logarithmic mean temperature or concentration difference

o, out

outside

out

outlet

s

solution

v

vapor

References

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Jung-In Yoon
    • 1
    Email author
  • Thanh Tong Phan
    • 2
  • Choon-Geun Moon
    • 2
  • Ho-Saeng Lee
    • 2
  • Seok-Kwon Jeong
    • 2
  1. 1.College of Engineering, School of Mechanical EngineeringPukyong National UniversityPusanSouth Korea
  2. 2.Department of Refrigeration and Air-conditioning EngineeringPukyong National UniversityPusanSouth Korea

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