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September, 2002 PHOENICS Conf Moscow1 Modeling Performance of WECS Installed in Residential Towers M.A. Serag-Eldin American University in Cairo.

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Presentation on theme: "September, 2002 PHOENICS Conf Moscow1 Modeling Performance of WECS Installed in Residential Towers M.A. Serag-Eldin American University in Cairo."— Presentation transcript:

1 September, 2002 PHOENICS Conf Moscow1 Modeling Performance of WECS Installed in Residential Towers M.A. Serag-Eldin American University in Cairo

2 September, 2002 PHOENICS Conf Moscow2 INTRODUCTION-I It has been proposed to exploit high building structures in windy areas to install WECS

3 September, 2002 PHOENICS Conf Moscow3 INTRODUCTION-II Advantages: l Saving in WECS tower cost l Saving of land required for wind- farms l Saving of energy transmission costs l Possibility of increasing wind speed due to funneling effect

4 September, 2002 PHOENICS Conf Moscow4 OBJECTIVES l Present a computer model for WECS confined amidst building blocks. l Reveal how the model is implemented in PHOENICS l Demonstrate the application of the model, and reveal its use as a design tool

5 September, 2002 PHOENICS Conf Moscow5 Modeling Wind Flow l Domain assumed entirely in constant stress layer, with neutral stability l k- model of turbulence l governing equations expressing mass conservation, momentum balance in 3D, transport of k and l eqns of form:. ( V ) =. ( ) + S where any dependent variable, V = u i + v j + w k and S are the diffusion coefficient and source term, respectively, for

6 September, 2002 PHOENICS Conf Moscow6 Source term expressions S u- p/ x+ ( e u/ x)/ x+ ( e v/ x)/ y+ ( e w/ x)/ z v- p/ y+ ( e u/ y)/ x+ ( e v/ y)/ y+ ( e w/ y)/ z w- p/ z+ ( e u/ z)/ x+ ( e v/ z)/ y+ ( e w/ z)/ z kG k * - C 1 /k.G k * - C 2 2 /k *G k = t {2[( u/ x) 2 + ( v/ y) 2 +( w/ z) 2 ] + ( u/ y+ v/ x) 2 + ( u/ z+ w/ x) 2 + ( v/ z+ w/ y) 2 }, t C k 2 / l standard (k- ) model coefficients

7 September, 2002 PHOENICS Conf Moscow7 WECS model & BCs l WECS characteristics displayed as : power/thrust.vs.w l thrust effect introduced implicitly through w source-term l Inflow B.C.s: Undisturbed Atmospheric Flow, i.e. u = v = 0 w = 1 /. ( s / ) 1/2 ln(y/y o ) k= s /( C 1/2 ) =( s / ) 3/2 / y

8 September, 2002 PHOENICS Conf Moscow8 Boundary-Conditions-II l Top boundary: undisturbed atmospheric flow. l Outflow boundary: constant press, zero gradients l Ground boundary: u s = v s = w s = 0 s = [ /ln(y/y o )] 2 (w 2 + u 2 ) k = s /( C 1/2 ) = ( s / ) 3/2 / y l Side boundaries: symmetry boundary and undisturbed atmospheric flow

9 September, 2002 PHOENICS Conf Moscow9 CASE I : Rectangular Blocks w/o Bottom Pass

10 September, 2002 PHOENICS Conf Moscow10 TOP VIEW OF BUILDING Wind direction

11 September, 2002 PHOENICS Conf Moscow11 Cross-sectional elevation

12 September, 2002 PHOENICS Conf Moscow12 Grid at WECS k-plane

13 September, 2002 PHOENICS Conf Moscow13 Grid Enlargement

14 September, 2002 PHOENICS Conf Moscow14 Grid at Cowl Entrance

15 September, 2002 PHOENICS Conf Moscow15 Grid in Hub j-plane Wind direction

16 September, 2002 PHOENICS Conf Moscow16 Grid in Symmetry Plane Wind direction

17 September, 2002 PHOENICS Conf Moscow17 Flow in Symmetry Plane

18 September, 2002 PHOENICS Conf Moscow18 Enlargement of Flow

19 September, 2002 PHOENICS Conf Moscow19 Pressure in symmetry plane

20 September, 2002 PHOENICS Conf Moscow20 Flow in Hub1 j-plane

21 September, 2002 PHOENICS Conf Moscow21 Pressure in Hub Plane

22 September, 2002 PHOENICS Conf Moscow22 Case II: Open Pass

23 September, 2002 PHOENICS Conf Moscow23 Flow in Symmetry Plane

24 September, 2002 PHOENICS Conf Moscow24 Pressure in symmetry plane

25 September, 2002 PHOENICS Conf Moscow25 Case III : convergent-divergent blocks

26 September, 2002 PHOENICS Conf Moscow26 Flow in Hub 1 j-plane

27 September, 2002 PHOENICS Conf Moscow27 Flow in Hub 3 j-plane

28 September, 2002 PHOENICS Conf Moscow28 Flow in symmetry plane

29 September, 2002 PHOENICS Conf Moscow29 Pressure in Hub1 j-plane

30 September, 2002 PHOENICS Conf Moscow30 Case IV: Turbine 2 out of service

31 September, 2002 PHOENICS Conf Moscow31 Pressure distribution

32 September, 2002 PHOENICS Conf Moscow32 Case V: Roof Turbine

33 September, 2002 PHOENICS Conf Moscow33 Flow in symmetry plane

34 September, 2002 PHOENICS Conf Moscow34 Pressure in symmetry plane

35 September, 2002 PHOENICS Conf Moscow35 Pressure in Turbines plane

36 September, 2002 PHOENICS Conf Moscow36 Summary of Results for 5 Cases

37 September, 2002 PHOENICS Conf Moscow37 Summary & Conclusion l The predictions revealed that there is a gain in speed for all cases which varied from case to case, albeit not very spectacular; best results require careful design of building shape, however this must be developed in conjunction with architectural requirements l the number of variables that need to be investigated are enormous, including: various building shapes and dimensions, HAWT character-istics and location, wind speed and direction, upstream wind profile and presence of nearby flow obstacles; all of which may be readily investigated with the aid of the present model.


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