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Projecte/Treball Fi de Carrera

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1<br />

0,009<br />

2<br />

3<br />

1<br />

2<br />

1<br />

v = ⋅ Rh ⋅ j<br />

n<br />

Q<br />

v =<br />

s<br />

⋅ 0,005<br />

1<br />

2<br />

2<br />

3<br />

1 ⎛ r ⎞<br />

v = ⋅ ⎜ ⎟ ⋅ 0,005<br />

0,009 ⎝ 2 ⎠<br />

5,95 · 10<br />

v =<br />

2<br />

π ⋅ r<br />

⎛<br />

⎜<br />

⎝<br />

r<br />

2<br />

⎞<br />

⎟<br />

⎠<br />

2<br />

3<br />

⋅r<br />

2<br />

−5<br />

2<br />

3<br />

⎛ r ⎞<br />

⋅⎜<br />

⎟<br />

⎝ 2 ⎠<br />

= 4,68 ⋅10<br />

-4<br />

1<br />

2<br />

⋅π<br />

⋅r<br />

⇒<br />

r<br />

2<br />

1<br />

0,009<br />

= 5,95 · 10<br />

-5<br />

4,68 · 10<br />

⎛<br />

⋅ ⎜<br />

⎝<br />

r<br />

2<br />

⎞<br />

⎟<br />

⎠<br />

⇒<br />

⋅ 2<br />

2<br />

3<br />

⋅ 0,005<br />

8/3 3 / 8<br />

−4<br />

3 / 8<br />

( r ) = ( 7,43<br />

· 10 ) ⇒ r = 0,067 m = 67 mm<br />

8/3<br />

=<br />

-4<br />

2/3<br />

1<br />

2<br />

Annexos Memòria<br />

5,95 ⋅10<br />

=<br />

2<br />

π ⋅r<br />

2<br />

⎛ r ⎞ 3<br />

2<br />

7 , 86 ⋅ ⋅ =<br />

⇒<br />

⎜ ⎟<br />

⎝ 2 ⎠<br />

r<br />

8/3<br />

r<br />

= 7,<br />

43 · 10<br />

-5<br />

5,95 · 10<br />

Es busca el catàleg <strong>de</strong> tubs <strong>de</strong> drenatge comercials per <strong>de</strong>terminar el diàmetre<br />

<strong>de</strong>l tub que més s’aproximi a les necessitats <strong>de</strong>l projecte. El tub seleccionat<br />

compleix les següents característiques:<br />

Canonada <strong>de</strong> PVC perforada corrugada <strong>de</strong> doble paret.<br />

Perforat total (360º)<br />

Diàmetre exterior = 160 mm<br />

Diàmetre interior = 101,5 mm<br />

Comprovació <strong>de</strong> la velocitat <strong>de</strong> l’aigua:<br />

5,95 · 10<br />

v =<br />

2<br />

π ⋅ r<br />

−5<br />

5,95 · 10<br />

=<br />

π · 0,067<br />

−5<br />

2<br />

=<br />

4,22 · 10<br />

És una velocitat molt baixa però acceptable.<br />

-3<br />

m<br />

s<br />

-4<br />

-5<br />

37

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