IES-VE User Forum

Dear all,

This is a building services question regarding achieving BREEAM credits - I am hoping someone could maybe shade some light in this area, here is my question:

Can IES be used to carry out dynamic thermal modelling to demonstrate that the building design and services strategy can deliver thermal comfort levels in occupied spaces? The purpose of this simulation is to produce evidence in order to achieve the "Hea03: Thermal Comfort" credit for BREEAM. If this is possible, which simulation do I need to run on IES and how do I go about extracted the results?

Thank you

Sinan

Hi I am currently carrying out the same simulations.

<My understanding is as follows.

Set up the model for a full dynamic simulation i.e.

Internal gains, heating, cooling, ventilation etc etc

Are you are looking at PMV and PPD??

If this is the case go to "vista" to view your results from the simulation.

Once in vista, on the top tool bar you will see an icon which looks like a question mark and a tick beside it.

Here you will define your activity level in met, your clothing level in clo, and your air velocity in m/s.

All of the above inputs along with your room temperature will define your PMV.

your PPD is then calculated based on the PMV.

So the aim of the dynamic simulation is to find out what the room air temp will be in each room.

when setting up each room you will find an option in the room query called "simulation heating capacity".

If this is set to "unlimited" is means that there is unlimited capacity in the heating source to reach your defined temperature.

Which is not really the case.

What would happen is that there is a rad in there with a specific output.

So, un tick unlimited and enter the actual output of the rad.

The room temperature will then be based on whether or not the rad is big enough to maintain a specific room temp.

If its too small, then you will see that people are cold resulting in a "minus" result and the PMV scale.

So maybe you might want to increase the pre heat period if this was the case??

Thats my imput on it anyway, someone correct me if im wrong!!

I have recently performed an assessment of this BREEAM credit using IES, and what wyliecoyote has explained is the same approach I took. Except there is a BREEAM navigator which produces a detailed report for assessing BREEAM thermal comfort credit. You can use this report as part of the submission.