Abstract
To achieve sufficient air conditioning of large buildings, reasonable air distribution in indoor spaces is an effective method for creating stratified air conditioning. Therefore, optimizing the air distribution in large buildings is extremely significant. In this paper, we expound on a new method for air distribution design and optimization based on target value evaluation and summarize the relevant design processes based on an orthogonal test and by decoupling the effects of the size of the tuyère, airflow temperature, air-supply angle and velocity on air distribution. Then, we present a design case. To optimize the distribution of a lateral air supply in winter, the deflection angle, velocity and temperature of the air supply can be determined in turn. For the large and tall building types addressed in this paper, the optimal air-supply angle is 2°, the optimal air-supply velocity is 8 m/s, and the optimal air-supply temperature is 19 °C.
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Abbreviations
- a :
-
outlet dimensionless turbulence coefficient
- Ar :
-
Archimedes number
- Ar m :
-
Archimedes number of model situations
- Ar p :
-
Archimedes number of actual situations
- Cg:
-
free fall acceleration similarity scale
- C 1 :
-
length similarity scale
- \({C_{\Delta {T_0}}}\) :
-
temperature difference similarity scale
- C q :
-
air-supply volume similarity scale
- C q :
-
heat similarity scale
- \({C_{{T_{\rm{u}}}}}\) :
-
temperature similarity scale
- \({C_{{u_0}}}\) :
-
velocity similarity scale
- d 0 :
-
air inlet diameter (m)
- g :
-
free fall acceleration (m/s2)
- G k :
-
generated turbulence kinetic energy due to the mean velocity gradients
- k :
-
turbulent kinetic energy (m2/s2)
- m j :
-
jth simulated value (m/s)
- n 1 :
-
number larger than the number of test points for the target value
- n 2 :
-
number smaller than the number of test points for the target value
- S :
-
the modulus of the mean rate-of-strain tensor
- T :
-
target value
- T 0 :
-
jet outlet temperature (K)
- T n :
-
ambient air temperature (K)
- T x :
-
axial temperature of jet x at the outlet (K)
- T u :
-
thermodynamic temperature (K)
- t i :
-
jth experimental value (m/s)
- u 0 :
-
air-supply velocity (m/s)
- u x :
-
axial velocity starting from the pole to a distance of x from the calculated section (m/s)
- x :
-
distance from the pole to the calculated section (m)
- x i :
-
horizontal jet distance (m)
- y i :
-
longitudinal deflection distance of the jet (m)
- α :
-
air expansion coefficient
- β :
-
angle between the jet and the horizontal plane (°)
- δ :
-
deviation between the experimental value and the simulated value
- α k :
-
turbulent Prandtl numbers for k
- α ε :
-
turbulent Prandtl numbers for ε
- ε :
-
turbulent dissipation rate (m2/s3)
- ΔT 0 :
-
temperature difference (K)
- μ :
-
molecular viscosity
- μ t :
-
turbulent viscosity
- ρ :
-
fluid density (kg/m3)
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Acknowledgements
This research project was sponsored by the National Key R&D Program of China (No. 2017YFC0702800), the National Natural Science Foundation of China (No. 51878533 and No. 51508442), the Natural Science Foundation of Shaanxi Province (No. 2019JM-233), and the Industrialization Fund of the Shaanxi Provincial Department of Education (No. 19JC023).
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Gao, R., Zhang, H., Li, A. et al. Research on optimization and design methods for air distribution system based on target values. Build. Simul. 14, 721–735 (2021). https://doi.org/10.1007/s12273-020-0679-1
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DOI: https://doi.org/10.1007/s12273-020-0679-1