BRUKL and Vista BER and TER Discrepancy

[CTurner]

Hi there,

I'm running a simulation of a simple small drive through fast food stand. When I run an ApacheSIM Part L compliance test, my BER and TER in the BRUKL are almost double that of my carbon summary in the Compliance report.

I understand that there are adjustment factors to take into account, but these are usually based off the ADL2a Table 2. I don't understand what is causing the carbon summary BER and TER (which are sensible numbers, based off an existing model with new efficiency values that add up) and the BRUKL output which is approximately 1.9 times larger.

Any help is much appreciated!

Cheers

[CTurner]

To answer my own question, I figured out the problem.

The building was single story with a sloped roof. This was modelled as an internal void or warm roof, with no heating or cooling and no internal loads, just normal infiltration.

When I ran VE Compliance, Vista would display the total model area under 'Total building floor area', 'actual conditioned floor area' and 'notional conditioned floor area'. It really should have displayed different values for 'total' and actual conditioned'. The BER was calculated by dividing the total carbon emissions for the building by only the 'actual conditioned' floor area, whilst the carbon summary seemed to divide it by the 'total' floor area, which included the roof space.

I'm not quite sure why it does this but by removing the roof from the analysis the carbon summary and the BER match up. So if anyone else has this problem check the project details under Compliance report.

[pratikz]

Hey CTurner,

I am also facing the same issue. My conditioned floor area are different in Vista for Actual and Notional Building. Also, the Carbon emission in Carbon summary and TER are both different in Vista results. Not sure where I am going wrong.

Any suggestions will be much appreciated.

Thank you.