Wrocław, 01.XII.2000
Wentylacja
Projekt 2
Temat: Metoda Budryka, Crossa
Wykonał: Mariusz Pietruń
METODA BUDRYKA:
Założenia:
Aby dokonać obliczenia strumieni powietrza należało:
oznaczyć kierunki rozpływu strumieni powietrza,
oznaczyć węzły sieci, zgodnie z kierunkami rozpływu,
oznaczyć klasy bocznic sieci,
wykorzystać zależności:
,
,
uwzględniając, że opory bocznic połączonych szeregowo i przekroje bocznic połączonych równolegle można dodać, obliczono zastępczy opór sieci oraz przekrój równoznaczny.
przy obliczaniu rozpływu wykorzystać zależności:
Przykładowe obliczenia:
m2
m2
A7-8 = A7-e-8 + A7-f-8 = 1,4005+1,5215 = 2,922 m2
R 2-9 = R 2-7 + R 7-8 + R 8-9 = 0,34 + 0,1654 + 0,3 = 0,8054
V 7-8 = V 7-e-8 + V 7-f-8 = 16,74+18,18 =34,92
Zestawienie wyników obliczeń:
Bocznica |
klasa 0 |
klasa 1 |
klasa 2 |
klasa 3 |
klasa 4 |
Klasa 5 |
Klasa 6 |
|||||||
|
A |
R |
A |
R |
A |
R |
A |
R |
A |
R |
A |
R |
A |
R |
4b5 |
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1,4411 |
0,6800 |
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4c5 |
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1,3908 |
0,7300 |
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4 5 |
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0,1761 |
2,8319 |
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3 4 |
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0,1900 |
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5 6 |
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0,3000 |
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3c6 |
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1,4561 |
0,6661 |
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3a6 |
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1,2457 |
0,9100 |
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3 6 |
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0,1935 |
2,7018 |
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2 3 |
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0,4900 |
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6 11 |
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0,2900 |
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2a11 |
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1,2044 |
0,9735 |
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2 7 |
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0,3400 |
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7e8 |
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1,4005 |
0,7200 |
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7f8 |
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1,5215 |
0,6100 |
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7 8 |
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0,1654 |
2,9220 |
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8 9 |
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0,3000 |
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9d10 |
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1,6976 |
0,49 |
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9f10 |
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1,5604 |
0,58 |
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9 10 |
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0,1330 |
3,2580 |
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10 11 |
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0,1900 |
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2f11 |
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1,1187 |
1,1284 |
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2 11 |
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0,2617 |
2,3231 |
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1 2 |
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0,0200 |
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11 23 |
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0,1800 |
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1a23 |
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1,7490 |
0,4617 |
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15l16 |
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1,9277 |
0,3800 |
15m16 |
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1,6640 |
0,5100 |
15 16 |
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0,1095 |
3,5918 |
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14 15 |
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0,4100 |
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16 17 |
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0,2000 |
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14m17 |
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1,4010 |
0,7195 |
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14k17 |
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1,6171 |
0,5400 |
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14 17 |
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0,1550 |
3,0181 |
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13 14 |
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0,2500 |
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17 18 |
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0,1800 |
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13m18 |
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1,5537 |
0,5850 |
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13j18 |
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1,6976 |
0,4900 |
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13 18 |
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0,1336 |
3,2513 |
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12 13 |
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0,3000 |
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18 21 |
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0,3900 |
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12m21 |
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1,3094 |
0,8236 |
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19h20 |
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1,3908 |
0,7300 |
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19i20 |
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1,4411 |
0,6800 |
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19 20 |
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0,1761 |
2,8319 |
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12 19 |
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0,4500 |
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20 21 |
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0,3100 |
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12h21 |
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1,2282 |
0,9361 |
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12 21 |
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0,2193 |
2,5377 |
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21 22 |
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0,2500 |
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12m22 |
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1,7347 |
0,4693 |
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12g22 |
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1,2004 |
0,9800 |
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12 22 |
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0,1639 |
2,9351 |
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1 12 |
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0,0300 |
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22 23 |
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0,3100 |
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1m23 |
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1,6740 |
0,5039 |
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1 23 |
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0,1205 |
3,4230 |
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23 24 |
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0,0200 |
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1 24 |
3,1700 |
0,1405 |
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bocznica |
klasa 0 |
klasa 1 |
klasa 2 |
klasa 3 |
klasa 4 |
klasa 5 |
klasa 6 |
||||||||||||||
|
A |
V[%] |
V |
A |
V[%] |
V |
A |
V[%] |
V |
A |
V[%] |
V |
A |
V[%] |
V |
A |
V[%] |
V |
A |
V[%] |
V |
cała |
3,1700 |
100,00 |
116,28 |
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1 2 |
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8,4028 |
0,551 |
64,01 |
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2 7 |
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2,0380 |
0,546 |
34,92 |
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7e8 |
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1,4005 |
0,479 |
16,74 |
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7f8 |
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1,5215 |
0,521 |
18,18 |
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8 9 |
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34,92 |
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9d10 |
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1,6976 |
0,521 |
18,20 |
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9f10 |
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1,5604 |
0,479 |
16,73 |
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2 3 |
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1,6976 |
0,454 |
29,09 |
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3 4 |
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2,7262 |
0,686 |
19,97 |
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4b5 |
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1,4411 |
0,509 |
10,16 |
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4c5 |
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1,3908 |
0,491 |
9,81 |
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5 6 |
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19,97 |
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3a6 |
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1,2457 |
0,314 |
9,12 |
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6 11 |
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29,09 |
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10 11 |
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34,92 |
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11 23 |
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64,01 |
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1 12 |
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6,8609 |
0,449 |
52,27 |
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12 19 |
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1,7715 |
0,449 |
15,12 |
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19h20 |
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1,3908 |
0,491 |
7,43 |
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19i20 |
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1,4411 |
0,509 |
7,70 |
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12 13 |
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2,1696 |
0,551 |
18,52 |
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13 14 |
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2,3767 |
0,583 |
10,81 |
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14 15 |
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1,8559 |
0,534 |
5,77 |
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15l16 |
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1,9277 |
0,537 |
3,10 |
15m16 |
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1,6640 |
0,463 |
2,68 |
16 17 |
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5,77 |
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14k17 |
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1,6171 |
0,466 |
5,03 |
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17 18 |
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10,81 |
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13j18 |
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1,6976 |
0,417 |
7,72 |
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18 21 |
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18,52 |
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20 21 |
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15,12 |
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21 22 |
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33,65 |
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12g22 |
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1,2004 |
0,356 |
18,62 |
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22 23 |
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52,27 |
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23 24 |
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116,28 |
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Obliczanie strumienia wpływającego:
[m3/s]METODA CROSSA:
Założenia:
Aby dokonać obliczenia strumieni powietrza należało:
oznaczyć kierunki rozpływu strumieni powietrza,
oznaczyć węzły sieci, zgodnie z kierunkami rozpływu,
oznaczyć oczka niezależne,
oszacować strumienie powietrza przy założeniu, że strumień wpływający równy jest 100
liczyć do czwartej poprawki,
Przykładowe obliczenia:
Δpc1 = - 0,00028 ×
3 + 0,0017 ×
2 - 1,5
+ 370 = -0,00028×1003+0,0017×1002-1,5+370 = -43
δpc1 = - 0,00028 × 3
2 + 0,0017 × 2
- 1,5 = -0,00028×3×1002+0,0017×2×100-1,5 = -9,56
Pierwsza poprawka dla oczka pierwszego:
Zestawienie wyników:
Zestawienie strumieni objętości powietrza dla kolejnych bocznic:
Bocznica |
R |
|
|
|
|
|
1 2 |
0,02 |
100 |
77,0032 |
67,4037 |
62,9035 |
60,7041 |
2 3 |
0,07 |
70 |
52,6471 |
40,7101 |
35,2877 |
32,6914 |
2 5 |
0,09 |
30 |
24,3561 |
26,6937 |
27,6157 |
28,0126 |
3 6 |
0,30 |
30 |
26,4596 |
23,1226 |
20,3438 |
19,0825 |
3 4 |
0,05 |
40 |
26,1875 |
17,5874 |
14,9440 |
13,6089 |
4 6 |
0,04 |
20 |
19,8225 |
13,1339 |
10,3553 |
8,9740 |
6 7 |
0,03 |
50 |
46,2821 |
36,2566 |
30,6990 |
28,0565 |
4 5 |
0,03 |
20 |
6,3650 |
4,4535 |
4,5887 |
4,6349 |
5 7 |
0,02 |
50 |
30,7212 |
31,1472 |
32,2044 |
32,6475 |
7 8 |
0,02 |
100 |
77,0032 |
67,4037 |
62,9035 |
60,7041 |
Zestawienie poprawek dla sieci wentylacyjnej:
Poprawka |
I |
II |
III |
IV |
|
17,3529 |
11,9370 |
5,4223 |
2,5963 |
|
3,7179 |
10,0255 |
5,5575 |
2,6425 |
|
-3,5404 |
-3,3369 |
-2,7789 |
-1,2612 |
|
-22,9968 |
-9,5995 |
-4,5003 |
-2,1994 |
Zestawienie spiętrzeń
pc1 |
-43,0000 |
136,7301 |
190,8727 |
212,6796 |
222,5743 |
δpc1 |
-9,5600 |
-6,2190 |
-5,0872 |
-4,6099 |
-4,3890 |
pc2 |
88,3000 |
91,3822 |
90,1841 |
89,6820 |
89,4604 |
δpc2 |
-0,6060 |
-0,4907 |
-0,5352 |
-0,5540 |
-0,5623 |
Wzory do naliczania poprawek:
Bocznica |
Poprawka |
1 2 |
|
2 3 |
|
2 5 |
|
3 6 |
|
3 4 |
|
4 6 |
|
6 7 |
|
4 5 |
|
5 7 |
|
7 8 |
|
Przykładowe obliczenie poprawki pierwszej dla bocznicy 2-5