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Experimental investigation of heat and mass transfer in absorber with enhanced tubes

  • Thermal Engineering · Fluid Engineering · Energy and Power Engineering
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Abstract

In this paper, an experimental study of the absorption process of water vapor into lithium bromide solution is reported. For the purpose of developing high performance absorption chiller/heater utilizing lithium bromide solutions as working fluid, it brings the largest contribution to improve the performance of the absorber which normally requires the largest surface area among the four heat exchangers of the system. The performance of four types of absorber tubes; bare tube, bumping bare tube, floral tube and twisted floral tube, have been experimentally evaluated. The results show that the floral tube and the twisted floral tube show about 40% higher heat and mass transfer performance than the bare tube which is conventionally used in absorbers.

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Abbreviations

d :

Tube diameter, m

G R :

Mass flow rate, kg/s

h :

Heat transfer coefficient, kW/(m2·K)

L :

Tube length, m

Ng:

Groove number

Q :

Interchange heating value, kW

ΔTtm :

Log-mean temperature difference, °C

U :

Overall heat transfer coefficient, kW/(m2·K)

C :

Cooling water

i :

Inlet

m :

Average

o :

Outlet

s :

Absorption solution

Γ:

Film flow rate per length, kg/(m·s)

β:

Mass transfer coefficient, m/h

ϱ:

Density, kg/m3

ξ:

Average concentration, wt%

ξ*:

Equilibrium concentration, wt%

Δξ lm :

Log-mean concentration difference, wt%

A :

Absorber

References

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Authors and Affiliations

  1. Department of Refrigeration and Air-Conditioning Engineering, pukyong National University, Pusan, Korea

    Jung-In Yoon

  2. Graduate School, pukyong National University, Pusan, Korea

    Oh-Kyung Kwon & Choon-Geun Moon

Authors
  1. Jung-In Yoon
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  2. Oh-Kyung Kwon
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  3. Choon-Geun Moon
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Yoon, JI., Kwon, OK. & Moon, CG. Experimental investigation of heat and mass transfer in absorber with enhanced tubes. KSME International Journal 13, 640–646 (1999). https://doi.org/10.1007/BF03184574

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  • DOI: https://doi.org/10.1007/BF03184574

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