airpak常见问题问与答(一)建模基础.docVIP

airpak常见问题问与答（一）建模基础 1. My model is very complicated, what is the best way to build it??? t. o# ]1 @! W# N9 R/ k2 ]2. How can I simplify my model???: s$ I/ x4 O- _ _/ S5 M3. How often shall I save???! r5 h1 B6 y N1 L% K% o4. I am making models with only small changes between them, shall I save them under different names or get different solutions under the same name???2 s) I |+ A8 d! v; i( \1 N5. My area of interest is not surrounded by walls on all sides, is it OK to use the room walls or should I put openings on these walls???$ F??}, ]9 R( w, c0 s# q; f( M2 q- p* ]??h6. Should I include the effect of gravity in my model???, K% w) w2 J: r6 X7. Should I include the effect of radiation in my model? ??C% M, i M% S+ f0 k4 Y! o! \8. The calculation for the view-factor matrix is taking too long, what is happening? 1 g5 K, N A: L# b9. How do I decide whether the flow is turbulent or laminar???2 B. } C; h( F H/ `10. Is is easier to import a model from a CAD package or construct the model inside Airpak???6 V f$ \# X! N, t4 T: r% L11. What are the CAD package files I can import into Airpak???4 x6 b5 F5 L9 |0 S12. What units should I use???6 w- a* N( n. T# F7 k13. How do I take the effect of elevation into account???/ ~( W+ v* e8 A* T$ G; ~0 B14. My model is symmetric but my solution is not, what is the reason? ( A L) v8 `( x$ {* j8 _15. What is a typical magnitude of flow velocity due to (pure) natural convection? . V a7 X3 j I2 H8 e5 q( o16. Can I predict condensation in a room? 0 ~* T6 }# o, i. {4 J/ \( k! s( v Q: e% e--------------------------------------------------------------------------------2 u; O9 n; B4 f% n% h0 n+ p9 ~ @0 B @1 m: b* v??G/ _7 S2 q1 f% `6 X# T; D! ?7 q% ]6 c9 S9 K! j4 wMy model is very complicated, what is the best way to build it ?; ~??H0 R; Q- A5 u3 O/ b% SStart simple. First include the most important items such as the cabinet, big power devices, fans, vents and openings, if any. For first level analysis, ignore small details.