Fisier propriu pentru calcule rapide-Marius Tanasescu THE POWER OF SCIENCE
1.Stabilire debite masice/volumice de apa in functie de fluxul de caldura transportat la tevi PPR+AL:
] W [ , Q 100000 100000 100000 100000
] C ˚ [ , t θ
] C ˚ [ , r θ
] C ˚ [ , r θ t θ = θ Δ
90 9 0 7 70 0 6 60 0 7
70 50 40 12
20 20 20 5
207000
7
12
5
i ] e c p e e a i s / e t i a d g e a ] d ( θ K l a [ e ³ i , c m h e m i f a m = i / p m G c r a θ a a g u r e t c r i u ] p r a u K [ a t s s t e m C a ˚ a t e a r ρ a p C a r : , m r e [ t i e i e 2 u m ° t p : / x s p d i d ) e g n l b m a r t e e m a k e e p θ / e m C a J T a + D t l D 80 971.72 4185.85 1.1945 60 983.21 4174.98 1 1..19761 50 988.063 4170 1.19904 9.5 999.7704 4193 4.76985 9.5
999.7704
4193
9.8736
2.Calcul densitate apa in functie de temperatura: e i d ] C e ˚ , m [ 2 / a r ) r u θ t a + r e t θ p : ( m a = e p m T a θ
60
3 6 8 9 , 3 m θ
56
2 ↑ ) 3 6 8 9 , 3 -
m θ (
3138
4 9 , 8 8 2 + m θ
3 6 9 2 1 , 8 6 + m θ
348.94 128.12963
m θ ( x ) 4 9 , 2 8 ) ↑ 8 3 2 6 + 8 m 9 , θ 3 (
6 9 2 1 , 8 6 + m θ ( * 2 , 9 2 9 8 0 ) 5 3
1094811 65208910
a ³ ] l i m e / p g a a K a r u [ e t m t a : ρ a r t i e i e s p d n m e e e m D t
983.211
] h / ³ m [ , h
c i m ] u c l o e v / s t L i b [ , e h D G 1.22926 1.21806 1.21353 4.77095
G c i m u l o v t i b e D 4.42535 4. 4 4..38502 4.3687 17.1754
9.87587
35.5531
Caldura specifica a apei la diferite temperaturi: emperatura,[˚C}
0
5
10
15
18
20
25
30
Caldura
4218
4200.9
4188.4
4180
4176
4175.57
4170.8
4168.71
Tabel 1 Unitati de masura pentru presiune si valoarea lor echivalenta in [Pa]:
1 bar 1 kgf/m kgf/cm²(a Pa(N/m²)
10⁵
9.81
98100
1 torr
1 mmH2O
133,32
9.81
1 ft H2O
1 psi
3,34 / 10⁴ 1,45 / 10⁴ psi=pounds/inch²
x= y=
10197.2 mmH2O 1 bar 100000 Pa y x 9807 .=> 1mH2O=9806.6 Pa 0.098 .=> 1mH2O=0.098066 bari=98.066 mbari
10.1972 mH2O 1 mH2O
Viteza de circulatie a apei , in [m/s],prin conducta de PPR cu insertie de
) m m 4 , 4 1 = t n i Φ ( 0 2 Φ
) m m 8 1 = t n i Φ ( 5 2 Φ
) m m 3 2 = t n i Φ ( 2 3 Φ
0 4 Φ
0.0288
) m m 2 , 6 3 = t n i Φ (
) m m 6 , 5 4 = t n i Φ (
) m m 2 , 4 5 = t n i Φ (
0.0362
0.0456
0.0542
0 5 Φ
3 6 Φ
5 7 Φ
0.0144
0.0180
0.0002074
0.000324
0.000529 0.00083
0.00131044
0.00208
0.00294
7.5518014 7.4829816 7.4551206 29.309622
4.833153 4.789108 4.771277 18.75816
2.960192 2.933216 2.922295 11.48893
1.88795 1.87075 1.86378 7.32741
1.194973856 1.18408402 1.179675378 4.637864551
0.75309 0.74623 0.74345 2.92284
0.53306 0.5282 0.52624 2.06889
0.00987587 60.670918
38.82939
23.78208 15.1677
9.600379621
6.05029
4.28259
] s / ³ m [ ,
0.0230
) m m 8 , 8 2 = t n i Φ (
h
G c i m u l o v t i b e D 0.00122926 0.00121806 0.00121353 0.00477095
Viteze recomandate in [m/s] pentru circulatia apei prin conducte din otel negre,conform I13/2002,tabel 17.2 pag 88 Diametrul nominal (inch sau Retele Retele mm) interioare exterioare
3/8" 1/2" 3/4" 1"
0,2…..0,35
0,3…..0,6
0,4…..0,7
11/4" 11/2" 2"
0,5…..0,65
0,5…..0,75
0,5…..0,7
0,5…..0,8
0,5…..0,8
0,55…..1
63…..76
0,5…..0,9
0,6…..1,10
83…..95
0,65…..1,10 0,7…..1,15
102…..127
0,7…..1,15
0,9…..1,35
133…..152
0,9…..1,35
1,2…..1,7
168…..219
1,2…..1,7
1,4…..2,0
0,2…..0,4 0,3…..0,45
x x x
35
40
45
55
60
65
70
75
4167.88
4167.88
4168.71
4172.48
4174.98
4177.49
4180.49
4182.93
aluminiu:
) m m 0 , 5 6 = t n i Φ ( 0 9 Φ
) m m 6 , 9 7 = t n i Φ ( 0 1 1 Φ
0.0650
0.07960
0.00423
0.00634
0.37064 0.36726 0.36589 1.4385
0.24714 0.24489 0.24398 0.9592
2.97769
1.98554
80
85
4185.85
4188.75
