[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[EnergyPlus_Support] AFN Node Pressure Distribution & Air Density
- To: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Subject: [EnergyPlus_Support] AFN Node Pressure Distribution & Air Density
- From: "tobiasschulzeoooitu" <tobias.schulze@xxxxxxxxxxxxxx>
- Date: Thu, 22 Apr 2010 12:58:50 -0000
- Delivered-to: mailing list EnergyPlus_Support@xxxxxxxxxxxxxxx
- Delivery-date: Thu, 22 Apr 2010 06:59:34 -0600
- Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoogroups.com; s=lima; t=1271941173; bh=GldEYmt4TWJa0Y87z+4lyPkFXZ8EKm+/jKpDuO/LDuU=; h=Received:Received:X-Yahoo-Newman-Id:X-Sender:X-Apparently-To:X-Received:X-Received:X-Received:X-Received:X-Received:To:Message-ID:User-Agent:X-Mailer:X-Originating-IP:X-eGroups-Msg-Info:X-Yahoo-Post-IP:From:X-Yahoo-Profile:Sender:MIME-Version:Mailing-List:Delivered-To:List-Id:Precedence:List-Unsubscribe:Date:Subject:Reply-To:X-Yahoo-Newman-Property:Content-Type:Content-Transfer-Encoding; b=sXJ6Xd1wf9Venx+93MYy+ewyEFnYO636C++GmKQN7STDHm+KJqgFiamecmSSDq+s2u52JTDolsFEA81YKKCpQWg+i5Na7nRja3CeeoUKvxHqn1i+WSJIarZ/7IIDxCR6
- Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=lima; d=yahoogroups.com; b=mdbcm1hFQvuVVr9s/AaaQbToGy/FjR3cmUAD57AUUpRm8oKpUnxvJL586gJOYJzR3u5S9JyFtZKxtK5pxs42tzI4fNYic4NrSLisuSc3H0C6pcFTDtXq19YqzlyGDH99;
- Envelope-to: linda@xxxxxxxxxxxxxx
- List-id: <EnergyPlus_Support.yahoogroups.com>
- List-unsubscribe: <mailto:EnergyPlus_Support-unsubscribe@yahoogroups.com>
- Mailing-list: list EnergyPlus_Support@xxxxxxxxxxxxxxx; contact EnergyPlus_Support-owner@xxxxxxxxxxxxxxx
- Reply-to: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Sender: EnergyPlus_Support@xxxxxxxxxxxxxxx
- User-agent: eGroups-EW/0.82
Hello,
1) I try to understand how the 'AirflowNetwork Node Total Pressure' is inernally calculated. I undertood the outdoor node Pressure is the sum of static and wind pressure (outdoor static =0 && if CP's = 0 than outdoor wind pressure =0 too). The Zone pressure is only dependent on the difference of static zone- and outdoor-pressure. But how to calc i didn't understand.
Therfore I have some questions... :)
1a) Where is the Zone_Node situated Floor/ceiling/center?
1b) Is there a link to the room-air-model (temperature at a specific height - if not mixed air)?
1c) could you please give the formuala for the zone 'AirflowNetwork Node Total Pressure'? Especially how is the zone static pressure calculated?
2) For the calculation of the air density i used following formula, which wasn't found in the eng.reference - but it gives slightly different results:
ρ=(P_atm (1+W_air))/(461,518(T_air+273,15)(W_air+0,62198)) [kg/m3]
ρ = Air density [kg/m3]
Patm = Outdoor barometric pressure at ground level [Pa]
Wair = Air humidity ratio [kgWater/kgAir]
Tair = Air Temperature [°C]
Can you please specify the formula used in the code?
I hope you can give me further advice here.
Thank you in advance,
Tobias
------------------------------------
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/EnergyPlus_Support/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/EnergyPlus_Support/join
(Yahoo! ID required)
<*> To change settings via email:
EnergyPlus_Support-digest@xxxxxxxxxxxxxxx
EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx
<*> To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/