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Rookgasafvoer
CerapurAero – 6 720 810 567 (2015/07)
22
4.3.3 Bepaling van de lengten van de rookgasafvoerbuis bij en-
kelvoudige aansluiting
Analyseren inbouwsituatie
Uit de inbouwsituatie ter plaatse de volgende grootheden bepalen:
Soort rookgasafvoerbuisinstallatie
Uitvoering conform CEN
Gascondensatieketel
Horizontale rookgasafvoerbuislengte, L
w
Verticale lengte rookgasafvoer, L
s
Aantal extra 90 °-bochten in rookgasafvoerbuis
Aantal van de 15 °-, 30 °- en 45 °-bochten in rookgasafvoerbuis
Bepalen van de kengetallen
Afhankelijk van het rookgasafvoersysteem, het rookgasafvoertracee
conform CEN, gascondensatieketel en de diameter rookgasafvoer-
buis de volgende waarden bepalen ( tab. 15):
Maximale equivalente buislengte L
equiv,max
Equivalente buislengten van de bochten
Eventuele maximale horizontale buislengte L
w,max
Horizontale lengte rookgasafvoerbuis controleren (behalve bij ver-
ticale rookgasafvoersystemen)
De horizontale rookgasafvoerbuislengte L
w
moet kleiner zijn dan de
maximale horizontale rookgasafvoerbuislengte L
w,max
.
Berekenen equivalente buislengte L
equiv
De equivalente buislengte L
equiv
is de som van de horizontale en vertica-
le lengte van de rookgasafvoer (L
w
, L
s
) en de equivalente lengten van de
bochten.
Met de noodzakelijke 90 °-bochten is in de maximale lengte rekening ge-
houden. Bij iedere extra bocht moet met de equivalente lengte rekening
worden gehouden.
De equivalente totale buislengte L
equiv
moet kleiner zijn dan de maximale
equivalente buislengte: L
equiv,max
.
Voordruk voor de berekening
Voorbeeld: rookgasafvoersysteem conform C
93
Afb. 25 Inbouwsituatie van een rookgasafvoersysteem conform C
93
[1] Met de 90 °-bochten op de ketel en steunbochten in de schacht is
al in de maximale lengte rekening gehouden
L
w
Horizontale rookgasafvoerbuislengte
L
s
Verticale rookgasafvoerbuislengte
Uit de getoonde inbouwsituatie en de kengetallen voor C
93
in tab. 15 re-
sulteren de volgende waarden:
L
w
[m] L
w, max
[m] L
w
L
w, max
?
Tabel 16 Controleren horizontale lengte rookgasafvoerbuis
Aantal
Lengte
[m]
Som [m]
Rechte lengte L
W
×=
Rechte lengte L
S
×=
90 °-bochten × =
45 °-bochten × =
Totale equivalente lengte L
equiv
Maximale equivalente buislengte L
equiv,max
L
equiv
L
equiv,max
?
Tabel 17 Berekenen equivalente buislengte
Afb. 25 Tab. 15
Schachtdoorsnede Ø 200 mm L
equiv, max
= 24 m
Horizontale buislengte L
w
= 2 m L
w, max
= 3 m
Verticale buislengte L
s
= 10 m
Extra 90 °-bochten
1)
1) Met de 90 °-bochten op de ketel en steunbochten in de schacht is al in de maxi-
male lengte rekening gehouden.
2 L
equiv
= 2 m
45 °-bochten 2 L
equiv
= 1 m
Tabel 18 Kengetallen voor rookgasafvoer door de schacht conform C
93
L
w
[m] L
w, max
[m] L
w
L
w, max
?
23o.k.
Tabel 19 Controleren horizontale lengte rookgasafvoerbuis
Aantal
Lengte
[m]
Som [m]
Rechte lengte L
W
2 = 2
Rechte lengte L
S
1 × 10 = 10
90 °-bochten 2 × 2 = 4
45 °-bochten 2 × 1 = 2
Totale equivalente lengte L
equiv
18
Maximale equivalente totale buislengte L
equiv,max
24
L
equiv
L
equiv,max
? o.k.
Tabel 20 Berekenen equivalente buislengte
L
W
= 2 m
L
S
= 10 m
Ø 200
6 720 612 662-13.7TT
90°
90°
45°
45°
1
22


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