RE: [EnergyPlus_Support] Re: Adding untreated outside air to a zone?

I have tested the use of ventilatin object for your application, using the 3Zone PurchaseAIrTable building with the HVAV removed.

The natural temperature of the zones can reach about 57°C. I set the minimum indoor temperature for the Ventilation to start at 40°C. OA ACH rate was set to 3.0.

You can see from the attached spread sheet that the West Zone temperature was reduced with the ventilation. Because I am using the DesignDay simulatin, the starting and ending values are the same for the day at midnight, therefore the temperature at midnight was high.

When the zone temperatue cools off, the ventilation stopped, and then restarted again at 09:00.

No availibility manager was used.

If you still wanted to use a real fan, it is also possible using availabillity manager to control the fan, based on the zone temperature. You will still need to figure what OA value to use and connect the fan, the zone, and the OA mixer nodes correctly.

. Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: marko.ignjatovic1980@xxxxxxxxx
Date: Wed, 5 Sep 2012 20:44:07 +0000
Subject: [EnergyPlus_Support] Re: Adding untreated outside air to a zone?

Dr Li,

I don't know whether You answered to my or the other post. Since I am beginner in EnergyPlus , a I am not familiar with night schedule and Your problem, but i checked several times. I modified previous deadband and set cooling setpoint above max temperature in the zone. Fan electric consumption was zero so it means it stayed off. When I lowered this setpoint only 1 oC bellow max temperature fan consumption occur and is significantly lower than in first scenario (setpoint 50oC). The way I see it it means that the fan operates only when temp is above the given setpoint. Whether the fan varies outside air volume or not, I haven't checked (is there a way to measure it by output:meter or variable object?).

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
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> I am thinking of a similar situation with night schedule. A server room is usually served with the main HVAC which is turned off at night. When the room temerature is above 30°C, the available manager schedule would turn on a wndow unit to cool it down. I wonder, if the ventilation object can be turned on in the similar way. Dr. Li
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: jeannieboef@...
> Date: Wed, 5 Sep 2012 10:29:12 +0000
> Subject: [EnergyPlus_Support] Re: Adding untreated outside air to a zone?
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> I see your point. I hate to break it to you, but you'll have to delve into the wonderfull world of EMS to do this. It's maybe a bit daughnting, but worth it in the end and actually not that hard. The basic concept is to override schedule values based on logic as the simulation runs.
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