Jim,
I have not mentioned the air flow balancing before because I wanted to emphasize on the specifics of the system. The heat exchanger is HeatExchanger:AirToAir:FlatPlate.
Both you and Linda are right. The ZoneMixing object has its place in the model. The outdoor air needed to maintain the air flow balance in Zone 2 Bathrooms will come from another (third) zone and there I am going to use ZoneMixing object.
Zone 1 Science Labs has separate exhaust system (Ventilation:DesignFlowRate) that balances the air flow.
On 17.04.2012 13:17, Jim Dirkes wrote:
Miroslav,
You will still need to consider the airflow balance between zones.
· Zone 2 Bathrooms has a specific amount of exhaust / extract. It must be replaced by some source of outdoor air
· Zone 1 Science Labs uses outdoor air and must also have that air exhausted / extracted
That said, the HeatExchanger:AirToAir:SensibleAndLatent does not appear to be intended to take air from one zone for exhaust, while supplying outdoor air to another zone. You may want to use the ZoneMixing object any way to accomplish most of your goals. This is an interesting and realistic situation, but I have not attempted to model it. It is very straightforward except for the part about using different zones for outdoor air and exhaust.
The Building Performance Team
James V. Dirkes II, P.E., BEMP , LEED AP
1631 Acacia Drive NW
Grand Rapids, MI 49504
616 450 8653
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Miroslav Bratanov
Sent: Tuesday, April 17, 2012 6:01 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Ventilation System
Thank you for the reply Linda!
I don't have air exchange between the zones, so I think zonemixing would not work for my case.
Probably I did not explain it properly in the first place, so I attached a simple scheme.
My system consists of:
Heat Exchanger
Heating Coil
Supply Fan
Exhaust Fan
The supply side of the system uses outside air which is processed in heat exchanger (primary flow) and heating coil and then fed to Zone 1 Science Labs.
The exhaust side of the system takes air from Zone 2 Bathrooms. The air goes through the heat exchanger (secondary flow) and then it is discharged to the outdoors.
On 16.04.2012 21:01, Linda Lawrie wrote:
Yes, the simplest form of this is called "zonemixing".
Example files that come with EnergyPlus include spreadsheets that illustrate where you can find each object.
At 11:59 AM 4/16/2012, Miroslav Bratanov wrote:Dear EnergyPlus experts,
Is it possible to model a ventilation system in EPlus, which supplies
air to one zone and extracts the same amount of air from another zone?
Is there an example file for such case?
I have science labs zone and bathrooms zone. The ventilation system
supplies air to the science labs and extracts air from the bathrooms.
The science labs use separate exhaust ventilation system.
In other words the same system serves as a supply-only ventilation for
the science labs and exhaust-only ventilation for the bathrooms.
Thank you!
Miroslav
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