[EnergyPlus_Support] Re: OutdoorAir:Mixer questions

["Jean marais" <jeannieboef@xxxxxxxxx>]

Dr Li is pointing at one of the fundimentals of building energy simulation.
--Simulation is a good way of comparing stradegies and learning from the effects which are better combinations than others.
--Simulation is bad at replicating reality to come up with realistic results within 10% of the real world measurements. This is because of unknown usage types, patterns and schedules of the building to a large extent.

Unfortuanately, the latter is always the expectation in the mind of the client. As everybody knows, the best ideas in the world don't get used if they don't get sold. A good example of this is a simulation building's geometry and zone division simplification. The client will want to see what the 3D simulated building looks like. When the pictures look bad, you won't sell him believability of the simulation.

In my case I have a working EMS now to control my dampers with regard to the CO2 levels in the spaces and are playing with control stradegies. What has become apparent is the combination of the link between combating CO2 loads with this technology and at the same time retaining the room set point temperatures. The two do not always co-exist peacefully. They also have an upto 10% impact on my peak cooling load which is the main question from the client.

The client was quite insistant that the CO2 DCV is simulated and prooves effective, because it helps justify his having sold the idea to his client.

Never forget that the building industry is a very political place.

As for my system and the suggestion of my ODA, I have it easy in that the fan volume capacities are known from the installed systems. It is a DOAS and so when my dampers open and close they directly change the ODA. I have suppressed mixing by setting the ODA fraction schedule in the ODA Controller to always-1.



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