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Dear yun,
- duct_1 looks OK. You will nevertheless get a ***CER***NOTE mentioning duct_1's vertical 3m shaft.
- duct_2 should have Height_to = 11 m.
- crack_1 is OK if you intend to model a vertical leakage pathway from room1 (2 m above the floor in room1) to room2 (2 m above the floor in room2).
- A definition of Height_from and Height_to is given on pages 98-100 of the COMIS 3.1 User's Guide, and in the bubble help-text in COMISexcel.
- Below is a description of Height_from, Height_to, and Own_height_factor, based on the help-text in COMISexcel:
Height_from and Height_to are simply the height of each end of the link above the reference plane of the two connected zones.
Thus, Height_from and Height_to are the same unless:
- the two connected zones have different reference plane heights (e.g. a crack in outer wall of a 2nd floor room),
- or when the link has a vertical component (e.g. vertical shaft).
e.g. For an outside window:
Height_from would be the height between the external node reference plane (i.e. ground level) and the window, and
Height_to would be the height difference between the window and the inside zone reference plane (i.e. floor level).
Height_from would be the height between the external node reference plane (i.e. ground level) and the window, and
Height_to would be the height difference between the window and the inside zone reference plane (i.e. floor level).
Own_height_factor has a misleading name; it is in fact only relevant for slanted windows/doors (e.g. in a pitched roof). In COMISexcel, the name has been corrected to Window_tilt_factor. However, even for links that are not tilted windows/doors this column SHOULD NOT BE EMPTY, even though it is not relevant. Type for example "d" for default, or "1". The Own_height_factor (Window_tilt_factor) is the SIN of the tilt angle of the window's facade relative to horizontal, e.g.
e.g.
Vertical wall (SIN 90°) : Tilt_factor = 1.0 (default)
45° roof (SIN 45°) : Tilt_factor = 0.71
Flat roof (SIN 0°) : Tilt_factor = 0.0
45° roof (SIN 45°) : Tilt_factor = 0.71
Flat roof (SIN 0°) : Tilt_factor = 0.0
Kind regards,
Peter
-----Opprinnelig melding-----
Fra: comisyun [mailto:comisyun@...]
Sendt: 12. desember 2003 02:38
Til: comis@yahoogroups.com
Emne: [comis] Link height of vertical duct
Fra: comisyun [mailto:comisyun@...]
Sendt: 12. desember 2003 02:38
Til: comis@yahoogroups.com
Emne: [comis] Link height of vertical duct
Dear COMIS users
I am struggling with understanding the definition about link height
of vertical duct.
For example,
There are three rooms (H:3, D:5, W:5) in a row vertically.
Therefore the reference heights of room1, room2, room3 are 0, 3,
6m respectively.
I want to install 2 ducts like the followings;
duct1 : any diameter, length:3m, linking the ceiling of room1
and floor of room3.
duct2 : any diameter, length:2m, projected from the ceiling of
room3 like a stack
Then, what values are desirable for the description of each duct?
That is, "Height from", "Height to", "Own height factor".
If I entered <Height from :3, Height to :0, Own height factor:1>
for duct1
and <Height from :3, Height to :2, Own height factor:1> for
duct2 then the error messages were shown from cof file like the
followings.
***CER*** NOTE ***
&-NET-LINks: LinkID=duct_2 Type=DSduct_2 FROM(zone room3)=9.
m TO(zone ext_HS_1)=2.m deltaH=-7.m. ZoneHeight+LinkHeight is
different for sides FROM & TO, like a vertical shaft. Is this
OK ?
-----------------------------------------------------------
***CER*** NOTE ***
&-NET-LINks: LinkID=crack_1 Type=CRcrack_1 FROM(zone room1)=
2.m TO(zone room2)=5.m deltaH=3.m. ZoneHeight+LinkHeight is
different for sides FROM & TO, like a vertical shaft. Is this
OK ?
Is this OK really? I am not sure because there is no
description about it in the User`s guide. Please teach me..
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