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Study on the reentering rates of individual cooling towers installed on a building roof

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Abstract

In this paper, the averaged reentering rates of the densely built cooling towers, which form banks on the building roof in Seoul, Korea have been predicted by a numerical method according to various summer wind conditions and roof wall types. The averaged reentering rates of all the cooling towers are compared according to two wall types to study the effect of the intake outdoor air louver on the reentering rates. Consequently, two findings are drawn as follows. (1) With a curtain wall, the averaged reentering rates of the total cooling towers against the west and the south wind at ν = 5 m/s are 13.3 and 24.4%, respectively. Therefore, it is strongly needed to find a method to reduce the reentering of the discharged air from the cooling towers. (2) In the case of a louver wall, the averaged reentering rates of the cooling towers with the west and south wind at ν = 5 m/s are 2.5 and 9.74%, respectively, which have been estimated to be lower than those of the curtain wall. Therefore, the louver wall can be suitably adopted to reduce the reentering of the discharged air from the cooling towers in the present study.

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Abbreviations

C μ , C 1ε , C 2ε :

coefficients in the turbulence model

g :

gravity (m/s2)

G k :

generation of turbulent kinetic energy due to mean velocity gradients (kg/m s3)

G b :

generation of turbulent kinetic energy due to buoyancy (kg/m s3)

k :

turbulent kinetic energy (m2/s2)

P :

pressure (Pa)

G :

mass flow rate of air (kg/s)

L :

mass flow rate of circulating cooling water (kg/s)

N b :

number of cooling towers in each bank

N t :

number of total cooling towers

q :

heat flux per unit area (W/m2)

R ct :

reentering rate of individual cooling towers (%)

\( \overline{R} \) :

averaged reentering rate of banked cooling towers (%)

\( \widetilde{R} \) :

averaged reentering rate of total cooling towers (%)

T :

temperature (K)

u, v, w :

velocities in x-, y-, z-directions (m/s)

x, y, z :

Cartesian coordinates (m)

Sc t :

Schmidt number

D :

mass transfer coefficient (m2/s)

NE-, NW-, S-, W:

bank names of cooling tower groups identified by installation location

x :

mole fraction of water vapor [kg/kg Dry air (DA)]

β :

coefficient of volumetric thermal expansion (K−1)

ε :

dissipation rate of turbulent kinetic energy (m2/s3)

μ l :

laminar viscosity (kg/s m)

μ t :

turbulent viscosity (kg/s m)

ρ :

density (kg/m3)

σ t :

turbulent Prandtl number

a:

entering air

i, j :

tensor components

o:

outdoor air or ambient air

w:

circulating cooling water

r:

reentering air

References

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Authors and Affiliations

  1. Department of Mechanical Engineering, Graduate School of Hanyang University, Seoul, 133-791, South Korea

    Sun-Ae Moon, Tae-Gu Lee, Jin-Huek Hur & Ki-Moo Heo

  2. Department of Mechanical Engineering, Soongsil University, Seoul, 156-743, South Korea

    Hoseon Yoo

  3. School of Mechanical Engineering, Hanyang University, Seoul, 133-791, South Korea

    Seung-Jae Moon & Jae-Heon Lee

Authors
  1. Sun-Ae Moon
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  2. Tae-Gu Lee
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  3. Jin-Huek Hur
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  4. Ki-Moo Heo
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  5. Hoseon Yoo
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  6. Seung-Jae Moon
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  7. Jae-Heon Lee
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Correspondence to Jae-Heon Lee.

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Moon, SA., Lee, TG., Hur, JH. et al. Study on the reentering rates of individual cooling towers installed on a building roof. Heat Mass Transfer 44, 1345–1353 (2008). https://doi.org/10.1007/s00231-008-0373-9

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  • DOI: https://doi.org/10.1007/s00231-008-0373-9

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