I'm wondering what is the best way to model exposed thermal mass roof in a room
Can you just remove the ceiling tiles/plaster from the construction?
It doesn't look like it has an effect when I look at the derived parameters there appears to be no difference.
Cheers
Exposed thermal mass
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Complex Potential
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Re: Exposed thermal mass
Removing the plaster from the construction works fine. You'll also want a decent night vent to see the benefit.
Re: Exposed thermal mass
Thanks,
I'm really struggling to get some classrooms to meet BB101 there only 55m2 but still being assessed with an occupancy of 32 people. Not sure if night purge is an option, at present I'm at 10% opening with no luck.
On a side note do you normally use Air temparature or dry resultant for BB101?
I'm really struggling to get some classrooms to meet BB101 there only 55m2 but still being assessed with an occupancy of 32 people. Not sure if night purge is an option, at present I'm at 10% opening with no luck.
On a side note do you normally use Air temparature or dry resultant for BB101?
-
Complex Potential
- VE Expert
- Posts: 467
- Joined: Wed Jan 09, 2013 11:57 am
- Location: Bristol, UK
Re: Exposed thermal mass
From memory, BB101 should be air temperature I think.
The 32C limit can be tough to comply with in nat vent classrooms, especially if you are using the CIBSE London weather file since the external dry bulb peaks at over 32C.
If you have no night purge then the exposed ceilings are going to be of little help.
Of course, with BB101 you only have to comply with 2 out of 3 of the criteria, so technically you could exceed 32C and still comply on the 120 hours above the average difference between internal and external (although that last one requires some "imaginative" interpretation of the wording).
Frankly though, if a nat vent classroom is going over 32C for whatever reason, then it's not really acceptable for teaching and, IMHO, should be cooled.
On a side note, I think BB101 is being / has been replaced by a new adaptive comfort scale under which you may do better.
The 32C limit can be tough to comply with in nat vent classrooms, especially if you are using the CIBSE London weather file since the external dry bulb peaks at over 32C.
If you have no night purge then the exposed ceilings are going to be of little help.
Of course, with BB101 you only have to comply with 2 out of 3 of the criteria, so technically you could exceed 32C and still comply on the 120 hours above the average difference between internal and external (although that last one requires some "imaginative" interpretation of the wording).
Frankly though, if a nat vent classroom is going over 32C for whatever reason, then it's not really acceptable for teaching and, IMHO, should be cooled.
On a side note, I think BB101 is being / has been replaced by a new adaptive comfort scale under which you may do better.