Fisier propriu pentru calcule rapide-Marius TanasescuTHE POWER OF SCIENCE

1.Stabilire debite masice/volumice de apa in functie de fluxul de caldura transportat la tevi PPR+AL:

Q,[

W]

θt,[

˚C]

θr,[

˚C]

100000 90 70 20 80 971.72 4185.85 1.194501 1.229264 4.425351100000 70 50 20 60 983.21 4174.98 1.197611 1.218062 4.385022100000 60 40 20 50 988.063 4170 1.199041 1.213527 4.368696100000 7 12 5 9.5 999.7704 4193 4.769855 4.77095 17.17542

207000 7 12 5 9.5 999.7704 4193 9.873599 9.875866 35.55312

2.Calcul densitate apa in functie de temperatura:

θm-3

,986

3

(θm

-3,9

863)

↑2

θm+

288,

94

θm+

68,1

2963

5089

29,2

*(θm

+68

,129

63)

Δθ=

θt-θ

r,[˚

C]

Tem

pera

tura

med

ie a

pa:

θ

m=

(θt

+θr

)/2,

[˚C

]

Den

sita

tea

apei

la

tem

pera

tura

m

edie

:ρm

[Kg/

m³]

Cal

dura

spe

cific

a a

apei

la

tem

pera

tura

med

ie

J/kg

x°C

Deb

it m

asic

Gh,

[Kg/

sec]

Deb

it vo

lum

ic

Gh,

[L/s

ec]

Deb

it vo

lum

ic

Gh,

[m³/

h]

Tem

pera

tura

med

ie a

pa:

θm=

(θt

+θr

)/2,

[˚C

]

(θm

+28

8,94

) x

(θm

-3,

9863

)↑2

Den

sita

tea

apei

la

tem

pera

tura

m

edie

:ρm

[Kg/

m³]

60 56.01 3138 348.94 128.12963 1094811 65208910 983.2107

Caldura specifica a apei la diferite temperaturi:

0 5 10 15 18 20 25 304218 4200.9 4188.4 4180 4176 4175.57 4170.8 4168.71

Tabel 1Unitati de masura pentru presiune si valoarea lor echivalenta in [Pa]:

1 bar 1 torr 1 psi

9.81 98100 133,32 9.81

1 bar 100000 Pa y x

x= 9807y= 0.0981

Temperatura,[˚C}:Caldura specifica J / kg x˚C:

1 kgf/m²1 kgf/cm²(at) 1 mmH2O 1 ft H2O

Pa(N/m²) 10⁵ 3,34 / 10⁴ 1,45 / 10⁴

psi=pounds/inch²

10197.2 mmH2O 10.1972 mH2O1 mH2O

.=> 1mH2O=9806.6 Pa

.=> 1mH2O=0.098066 bari=98.066 mbari

Viteza de circulatie a apei , in [m/s],prin conducta de PPR cu insertie de aluminiu:

0.0144 0.0180 0.0230 0.0288 0.0362 0.0456 0.0542 0.0650

0.0002074 0.000324 0.000529 0.000829 0.00131044 0.002079 0.002938 0.004225

0.00122926 7.5518014 4.8331529 2.9601919 1.88795 1.1949738558 0.753088 0.533061 0.3706370.00121806 7.4829816 4.7891082 2.9332156 1.870745 1.1840840202 0.746225 0.528203 0.3672590.00121353 7.4551206 4.7712772 2.9222945 1.86378 1.179675378 0.743447 0.526237 0.3658920.00477095 29.309622 18.758158 11.488929 7.327406 4.6378645511 2.922843 2.068886 1.438495

0.00987587 60.670918 38.829387 23.782082 15.16773 9.6003796208 6.050285 4.282595 2.977686

Φ20

(Φin

t=14

,4m

m)

Φ25

(Φin

t=18

mm

)

Φ32

(Φin

t=23

mm

)

Φ40

(Φin

t=28

,8m

m)

Φ50

(Φin

t=36

,2m

m)

Φ63

(Φin

t=45

,6m

m)

Φ75

(Φin

t=54

,2m

m)

Φ90

(Φin

t=65

,0m

m)

Deb

it vo

lum

ic

Gh,

[m³/

s]

Viteze recomandate in [m/s] pentru circulatia apei prin conducte din otel negre,conform I13/2002,tabel 17.2

pag 88

3/8" 0,2…..0,35 x1/2" 0,2…..0,4 x3/4" 0,3…..0,45 x1" 0,3…..0,6 0,4…..0,7

11/4" 0,5…..0,65 0,5…..0,7511/2" 0,5…..0,7 0,5…..0,82" 0,5…..0,8 0,55…..163…..76 0,5…..0,9 0,6…..1,1083…..95 0,65…..1,10 0,7…..1,15102…..127 0,7…..1,15 0,9…..1,35133…..152 0,9…..1,35 1,2…..1,7168…..219 1,2…..1,7 1,4…..2,0

35 40 45 55 60 65 70 75 804167.88 4167.88 4168.71 4172.48 4174.98 4177.49 4180.49 4182.93 4185.85

Diametrul nominal (inch sau mm)

Retele interioare

Retele exterioare

Viteza de circulatie a apei , in [m/s],prin conducta de PPR cu insertie de aluminiu:

0.07960

0.006336

0.2471440.2448910.243980.9592

1.985544

Φ110(

Φin

t=79

,6m

m)

854188.75