TM52 Adaptive Comfort: Criteria failing

[Ornella_05]

Hi everybody,

I am a beginner with Thermal Comfort assessment using the option CIBSE TM52 Adaptive Comfort.

I cannot realize why the analysis always gives me the following result (all the three criteria failing).

Room Name Room ID Occupied days (%) Criteria 1 (%Hrs Top-Tmax>=1K) Criteria 2 (Max. Daily Deg.Hrs) Criteria 3 (Max. DeltaT) Criteria failing
Zona Cafe ZN000000 100.0 0.0 0.0 0.0 -
Zona Cafe_StSulspice 1 100.0 0.0 0.0 0.0 -
Zona Cafe_corridoio ZN000001 100.0 0.0 0.0 0.0 -


Has anyone the same problem?

Many thanks

Ornella

[Ornella_05]

I cannot realize why the analysis always gives me the following result (all the three criteria failing).

Sorry for the mistake.

The error is not about failing, but with all the values equal to 0, as if IES VE has not calculated them.

Anyone can suggest me hot to fix it?

Many thanks

Ornella

[Wasted Energy]

Two things to check;

Firstly that the you have run the simulation from 1st May to 30th September (this is the minimum data set required).

Secondly that the rooms you want to analyse have a defined occupancy, (only occupied rooms are analysed by TM52)

Wasted

[Complex Potential]

Sorry, ignore me, I just re-read it.

[Ornella_05]

Thank you Wasted.

But yes, I have run simulation annually and the three rooms posted are occupied (setting People as internal gains).

Is there such a way to select a specific period for the adaptive comfort calculation?

Ornella

[Wasted Energy]

Mmmm...

That is a puzzle.

But one way forward, which also addresses your second question to some extent, is to use Vista to find the peak temperatures (funny looking 'clock' button) and then to use the range test ('?' to the left) to find temperatures which are hours over, say, 28 deg C.

This will firstly test that there is valid data from the Apache Sim to analyse, and that there hasn't been some kind of hiccup at this state, and secondly it will give a an idea of when overheating is occurring and by how much.

This is effectively the method previously advocated by CIBSE before the publication of TM52, and although it is less sophisticated in terms of predicting discomfort, it is better at pinpointing the 'when and where' of overheating (bearing in mind that overheating does not necessarily equate to discomfort).

W

[Ornella_05]

Thank you Wasted,

I checked with the Ta you said, and there are no hours with Ta>28°C (the building is in Montreal, with a huge openable and shaded skylight).

Given the following recommendation from the CIBSE TM52 Comfort Analysis of IES VE manual:

"A room or building that fails any two of the three criteria is classed as overheating"

could a verification of max Ta be sufficient to state that the room is not overheated?

Many thanks

Ornella

[Complex Potential]

There are a few issues here.

The first is that the results are returning zeros which actually means the rooms pass perfectly. This in itself is a little suspect for a naturally ventilated building, although never exceeding 28C might be normal for that part of the world.

The second is that the building is in Montreal and I have a hunch that TM52 is only applicable to UK CIBSE DSY weather data which might explain why the results are not being calculated.

Just my two cents.

CP

[jholgate]

Are you sure your applied systems isn't cooling?