Re: [EnergyPlus_Support] BREEAM HEA3 PMV simulations

The thing is the norm is for both physical measurement techniques and simulation. Simulation has its limits regardless what simulation method is used. The method determines the limits and simplifications. The norm does not specify which method you are to use. The requirements you present also don't specify the time point in the year to investigate. So I would assume that using representative zones and representative times are good enough for both dynamic thermal and CFD simulation (your choice).

Personally, I like dynamic thermal simulation for well mixed spaces and binning the time period that fall outside the comfort range. Below 200 to 300 hours is usually good enough depending on how strict the comfort class criteria are.

On 12 Aug 2015 9:44 am, "geert.bellens@xxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:

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Hello,

BREEAM asks for HEA3 (now HEA4) dynamic simulations , with the PMV as results. You have to prove that your zones fall into the range of comfortclass B (-0.5 <PMV>+0.5).

This is mentioned as follow in the BREEAM documentation:

Thermal modelling (or an analytical measurement/evaluation of the thermal comfort levels of the building) has been carried out using the PMV (predicted mean vote) and PPD (predicted percentage of dissatisfied) indices in accordance with ISO 7730:20051Â taking full account of seasonal variations.
Local thermal comfort criteria have been used to determine the level of thermal comfort in the building, in particular internal winter and summer temperature ranges will be in line with the recommended comfort criteria within ISO 7730:2005, with no areas falling within the levels defined as representing local dissatisfaction.
Thermal comfort levels in occupied spaces meet the Category B requirements set out in Table A.1 of Annex A of ISO 7730:2005.
The PMV and PPD indices are reported, via the BREEAM scoring and reporting tool, based on the modeling/measurement above.
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I have sometimes discussion about the phrase "Local thermal comfort criteria have been used to determine the level of thermal comfort in the building". What do they mean with "local thermal comfort criteria" ?

In the ISO 7730 you have the explanation of the PMV calculation, but also the "local discomfort" explanation. You can't really do a simulation to have local discomfort data, without having a CFD of every room for every moment of the day, no ?

So I presume that BREEAM means to calculate the PMV and PPD indices for the different zones.Â

Is this assumption correct?

Geert

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