is water loop inter-acting with air loop?

[geshen516]

In IES ApachHVAC, the water loop is defined with "chilled water loop"

The air loop is building by draging, droping and definding the loop.

A very interesting thing is whether the water loop is interacting with air loop? say, when we define a small chiller, and a proper air side (FCU or AHU), what will happen?
I tried for a small room. The result is not so encouraging. When the cooling coil size is correct, no matter what the chiller size is, the internal temperature will be held around design temperature.
When the air side is under sized, the temperature can not be held.

Does this mean the chilled water loop is just used to calculate the pump energy and chiller energy? and they do not interact with actual building load and air side.

Hope I am wrong and looking forward to get reply regarding this.

[myope]

Very nice question !!!
I got same results a few time.
We are waitting for new release that contents HVAC waterside for real interact between both sides.

[luanaepb]

Hi,

Do you have any news about this matter?

I'm working on a project in which I want to analyse the effect of changing the chiller's operational points and what are the impacts in the air side (higher/lower power/flow needed, for example). For example, if the chiller's temperatures are 7C-12,5C or 11C-16,5 I guess the water/air changes would not be the same.

Do you know if ApHVAC is sensible to this matters?

Thanks a lot!

[geshen516]

Hi,

Do you have any news about this matter?

I'm working on a project in which I want to analyse the effect of changing the chiller's operational points and what are the impacts in the air side (higher/lower power/flow needed, for example). For example, if the chiller's temperatures are 7C-12,5C or 11C-16,5 I guess the water/air changes would not be the same.

Do you know if ApHVAC is sensible to this matters?

Thanks a lot!

IES is only a calculator which you get the result after you input reasonable parameters.
chiller efficiency is varying under different boundary, and you need to have these curves or data in hand before turnning to iES