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숙희 류(유)
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1 19 3 ( ) J Korean Soc Occup Environ Hyg 2009;19(3):240~249 Numerical Study on Ventilation Method for Temperature Control of HRSG Building Chul Hwan Kim Jong Wook Lee Hoon Ki Choi Geun Jong Yoo Dept. of Mechanical Design and Manufacturing Engineering, Changwon National University HRSG(Heat Recovery Steam Generator) building is large enclosed structure included various heat sources. This building needs to appropriately keep internal air temperature for worker's safety and operability of control devices. In this study, ventilation analysis is performed to find proper ventilation method for temperature control. Ventilation analysis is applied to entire internal space of the building with standard k- model and enhanced wall treatment because of large size of the structure. And the ventilation method is considered natural and forced convection with two louver structures which has damper or not. Louver structure affect directly air circulation in near HRSG and lower region of the building. Forced ventilation provides strong inertial force which cause upward airflow. From the analysis, it is found that design requirement for internal air temperature can be satisfied by forced ventilation method with louver structure without damper. Key Words : ventilation, HRSG building, numerical analysis, k- model, louver structure HRSG. HRSG. HRSG. HRSG. HRSG HRSG. HRSG HRSG,. HRSG.,, : , : : ( , Tel : , churani@changwon.ac.kr)

2 241. Chen,, RANS (Chen, 1995) Reynolds (Chen, 1996), LES (Zhang & Chen, 2000). Stavrakakis (2008) RANS. Low-Reynolds.. Blay (1992) LRN(Low-Reynolds number) k-. Yilmaz Fraser(2007) LRN k-.,.., (Kang et al., 2008),.. Kim et al. (2005, 2008).. Kim et al.(2005, 2008) HRSG. (Betts Bokhari, 2000) HRSG. HRSG. HRSG HRSG. HRSG 50 Ra(Rayleigh number) Ra 10 9,. HRSG. (1) Navier-Stokes (2), (3)., Reynolds ( ). k- (Launder & Spalding, 1974)...., (2) ( ).,. Boussinesq, (4) ( ) ( ),.

242.. HRSG. Twolayer (Jongen, 1992) Kader (1981) Enhanced wall treatment (Fluent Inc., 2006).. Fluent v6.3.26. (2) SIMPLE.

3 242.. HRSG. Twolayer (Jongen, 1992) Kader (1981) Enhanced wall treatment (Fluent Inc., 2006).. Fluent v (2) SIMPLE. 1, (Patankar, 1980) PRESTO (Fluent Inc., 2006). HRSG , HRSG Fig m, 112.7m, 39.15m. 3 HRSG,. HRSG, 27.8m, 7.7m. HRSG I (Girder) HRSG. HRSG 3. Fig. 2,. HRSG Fig. 3.

243, Fig. 4.,.. (c),., HRSG. HRSG... HRSG,, HRSG. Cases No.

(kg/s) Tm ( ) Tw,avg ( ) hw (w/m2 ) 1 750 Natural (A) 155.

67 3 485 Natural (A) 155.26 46.44 50.42 5.

4 243, Fig. 4.,.. (c),., HRSG. HRSG... HRSG,, HRSG. Cases No. of Grid (million) Ventilation method Louver structure total (kg/s) Tm ( ) Tw,avg ( ) hw (w/m2 ) Natural (A) Natural (A) Natural (A) Natural (B) Natural (A)

5 , HRSG,,. Table 1, (Case 1~3) 0.1%. 485 (Case 3) 440 ~490. HRSG. Table 2. HRSG (Heat gain) (Heat flux).. (Ventilator) -Table 2 (-) -,. Fig. 5 Components Lower louvers (Natural) Upper louvers (Forced) Ventilator Pressure outlet: Atmosphere; Temperature: 37.2 Pressure outlet: Atmosphere; Temperature: 37.2 Velocity: m/s Boundary Conditions Heat sources etc. structures Walls HRSG, Drums Pumps Heat flux: W/m2 (Heat gain: 2074 kw, Area: m2) Heat flux: W/m2 (Heat gain: 300kW, Area: m2) Adiabatic No-slip

6 HRSG.,. HRSG Betts Bokhari(2000). Betts Bokhari(2000) Fig m, 0.76m, 0.52m Ra= (Betts Bokhari, 2000). Fig. 7..,... HRSG. HRSG.. Fig. 8 HRSG. 10m. 10m.. HRSG.. HRSG. HRSG.,,. Fig. 8

7 246 (c). Fr(Froude number), (5)(Blay et al., 1992). Fig. 9 Fr. Fr 2.5

8 , HRSG Fr 0.5. Fig z=15m 41. HRSG. z=30m 50., HRSG. Table Fig. 11 HRSG HRSG HRSG. HRSG HRSG

248. HRSG Fig. 12 Fr 1. Fig. 11 HRSG HRSG.

. Table 1 HRSG 4 HRSG 1 w/m2. HRSG.., HRSG,.

10 249 REFERENCES ; ;, 2005,,, 15(3), B. E. Launder and D. B.Spalding, 1974, The Numerical Computation of Turbulent Flows, Compter methods in Applied Mechanics and Engineering, 3, D. Blay; S. Mergui; C. Niculae, 1992, Confined turbulent mixed convection in the presence of a horizontal buoyant wall jet, ASME Fundamentals of Mixed Convection, 213, G. M. Stavrakakis; M. K. Koukou; M. Gr. Vrachopoulos; N. C. Markatos, Natural cross-ventilation in buildings: Building-scale experiments, numerical simulation and thermal comfort evaluation, 2008 J. J. Costa; L. A. Oliveira; D. Blay, 1999, Test of several versions for k- type turbulence modeling of internal mixed convection flows, Int. J. Heat and Mass Transfer, 42, J. H. Kang; S. J. Lee, 2008, Improvement of natural ventilation in a large factory building using a louver ventilator, Building and Environment, 43, Q. Chen, 1995, Comparison of Different k- Models for Indoor Air Flow Computation, Numerical Heat Transfer, 28, Q. Chen, 1996, Prediction of Room Air Motion by Reynolds-Stress Models, Building and Environment, 31, Wei Zhang, Qingyn Chen, 2000, Large eddy simulation of airflow with a filtered dynamic subgrid scale model, Int. Heat Mass Transfer, 43, P. L. Betts; L. H. Bokhari, 2000, Experiments on turbulent natural convection in an enclosed tall cavity, Heat and Fluid Flow, 21, T. Yilmaz; S. M. Fraser, 2007, Turbulent natural convection in a vertical parallel-plate channel with asymmetric heating, Heat and Mass Transfer, 50, Fluent Inc Fluent 6.3 User's guide,

116 제 2 발표장 (2 일금 ) 특별세션 - 고성능컴퓨팅 박근태 1, 최해천 1*, 최석호 2, 사용철 2, 권오경 3 ANALYSIS AND CONTROL OF TIP-LEAKAGE FLOW IN AN AXIAL FLOW FAN USING LARGE EDDY SI

116 제 2 발표장 (2 일금 ) 특별세션 - 고성능컴퓨팅 박근태 1, 최해천 1*, 최석호 2, 사용철 2, 권오경 3 ANALYSIS AND CONTROL OF TIP-LEAKAGE FLOW IN AN AXIAL FLOW FAN USING LARGE EDDY SI 116 제 2 발표장 (2 일금 ) 박근태 1, 최해천 1*, 최석호 2, 사용철 2, 권오경 3 ANALYSIS AND CONTROL OF TIP-LEAKAGE FLOW IN AN AXIAL FLOW FAN USING LARGE EDDY SIMULATION K. Park, H. Choi *, S. Choi, Y. Sa and O.K. Kwon 1., (tip-leakage