WUFI

Hi,

I’m writing because I’m a bit confused about some input data for inner climate in WUFI +

In the section, “Zone - General – Inner Climate” I can chose between (i) Calculate (ii) Design conditions (iii) Optional Climate. I assume that if I tick “Design conditions” the inner climate will be the one according to inputs entered in the section below “Design Conditions” such as temperature, relative humidity and CO2 concentration. On the other hand, and it’s particularly what I’m trying to do, if I want to define an optional climate from an external file (namely temperature), do I have to tick :
- “optional climate” in the Zone or
- “Design Conditions” and add my external temperature choosing “use data from extern file” in the temperature tab ? and in this case do I have to put it in the “max” or “min” ?

Another question, quite close to the previous one : if I tick “Calculate”, I don’t know whether or not I have to enter something regarding temperature, RH or CO2 concentration in the “design Conditions” section and above all if WUFI takes those values into account or not ? As for CO2 concentration, the same occurs in “Design Conditions” and “Inner loads/occupancy” which appears to have to be inputted twice…

I tried to be as clear as possible, I hope I have made my point. Thank you in advance for your help !

Hi,

to set up a file based indoor climate, both choices which you have described are possible. I would prefer the file based "optional climate". If there is no relative humidity within your external file, please check the default value for it.

If you choose "design conditions", the minmal conditions are used. But with Version 2.5.1.0 there might be an error (e.g. if the maximal conditions is below the minimal). This will be fixed in the upcoming release version. If you have only temperatures within the external file, you can design the relative humidity with the periode-day-profile instead of a constant value defined with the optional climate.

Ordinary, if you "calculte" the indoor climate the design conditions are the set points for the hvac systems. For example: if the indoor temperature would sink below the minimal design condition (without hvac). If you have defined a hvac device for space heating, the necessary heating power will be calculated to hold the minimal design temperature, as long as the space heating capablility is sufficient. This is quite equal with the other design conditions and hvac devices.

Thank you for your fast and clear answer !