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

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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.

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Abbreviations

A :

heat transfer area (m2)

C :

LiBr concentration (wt%)

c p :

specific heat at constant pressure (J/kg K)

d :

tube diameter (m)

h :

heat transfer coefficient (W/m2 K)

h mass :

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)

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)

c:

cooling water

i, in:

inside

in:

Inlet

lm:

logarithmic mean temperature or concentration difference

o, out:

outside

out:

outlet

s:

solution

v:

vapor

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Authors and Affiliations

  1. College of Engineering, School of Mechanical Engineering, Pukyong National University, San 100, Yongdang-dong, Nam-gu, Pusan, 608-739, South Korea

    Jung-In Yoon

  2. Department of Refrigeration and Air-conditioning Engineering, Pukyong National University, San 100, Yongdang-dong, Nam-gu, Pusan, 608-739, South Korea

    Thanh Tong Phan, Choon-Geun Moon, Ho-Saeng Lee & Seok-Kwon Jeong

Authors
  1. Jung-In Yoon
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  2. Thanh Tong Phan
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  3. Choon-Geun Moon
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  4. Ho-Saeng Lee
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  5. Seok-Kwon Jeong
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Corresponding author

Correspondence to Jung-In Yoon.

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Yoon, JI., Phan, T.T., Moon, CG. et al. Heat and mass transfer characteristics of a horizontal tube falling film absorber with small diameter tubes. Heat Mass Transfer 44, 437–444 (2008). https://doi.org/10.1007/s00231-007-0261-8

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  • DOI: https://doi.org/10.1007/s00231-007-0261-8

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