Chillers Load calculation in IES?

[ColinR]

Hi,

Brief query about the assessing the cooling load.

I've run a sim with a a mech. vent. system using a constant temp. profile of 19oC for the air supplied, rather than changing the system to "air-conditioned". That's all fine no problem.howver, when it comes to checking the loads, the systems are showing me that the aux vent sensible cooling load plus the aux vent latent cooling load (5.1687 MWh, 70kW peak) is less than the chillers load (4.7859 MWh, 49kW peak).


Anyone any idea how the "chillers load" is calculated in IES? I'm struggling to understand how my cooling fresh air load is using over 5MWh but my chiller is only using 4.7MWh. Is ther some default efficiency that is applied in IES to calculate the chillers load?

Any thoughts?

Cheers,

C