[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[EnergyPlus_Support] Merging zones having FCUs (Merging FCUs)
- To: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Subject: [EnergyPlus_Support] Merging zones having FCUs (Merging FCUs)
- From: "hisham.rashrash" <hisham.rashrash@xxxxxxxxx>
- Date: Wed, 18 Sep 2013 10:38:32 -0000
- Delivered-to: mailing list EnergyPlus_Support@xxxxxxxxxxxxxxx
- Delivery-date: Wed, 18 Sep 2013 09:24:59 -0600
- Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoogroups.com; s=echoe; t=1379517887; bh=HXjj/raGJZBs6rRV5vGns66or0x9molpG3ReIjqhlG4=; h=Received:Received:X-Yahoo-Newman-Id:Received:Received:Received:Received:DKIM-Signature:Received:Received:Received:X-Sender:X-Apparently-To:X-Received:X-Received:X-Received:X-Received:X-Received:X-Received:Message-ID:User-Agent:X-Mailer:X-Originating-IP:X-eGroups-Msg-Info:X-Yahoo-Post-IP:From:X-Yahoo-Profile:To:X-eGroups-Approved-By: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=YwkBz3/qjfS+dydhJRRZH0Ca9E/AuV4Ih0lJY/pp0h/PHhnA7u2JeIUWFte5Sm325RnKoJa4vAj8P7D+xWIQ+u6/Ca3qvVvRmygirrOFBvsfPvW0KS+7EveTsggKjY+Xcih8CSssHNCxveXpJrCv15G/o1w1KS8XklXiJxIVBao=
- Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoogroups.com; s=echoe; t=1379517884; bh=7L+rzFjybRXXnDudpyRMIHYI1OUW23iS3P8fCNZ6Cr8=; h=Received:Received:Received:X-Sender:X-Apparently-To:X-Received:X-Received:X-Received:X-Received:X-Received:X-Received:Date:Message-ID:User-Agent:MIME-Version:Content-Type:Content-Transfer-Encoding:X-Mailer:X-Yahoo-Newman-Property:X-Originating-IP:X-eGroups-Msg-Info:X-Yahoo-Post-IP:From:Subject:X-Yahoo-Group-Post:X-Yahoo-Profile:X-YGroups-SubInfo:To:Sender:X-Yahoo-Newman-Property:X-Yahoo-Newman-Id:X-eGroups-Approved-By:X-eGroups-Auth; b=d5MB7tSJVr8mYZRaLGS+NzQr34USTvqkfsTCfTCMidaER5KcbVCEfztw8TVahA27v3GKWAOK+aQnEmBLl+91pnOZXQE3JlNTyGvmvgk8u0IUy/CPWT8P1UOj6GXUWZEMRBYwR5VR5o3ibcnO1I+DdOx/xtjXKj/oomRBotCvMxY=
- Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=echoe; d=yahoogroups.com; b=ZdwQ9bhNaB1ygs+/kMOi+RcXU/oReS9mXHZ0GFeRHRt5VqcuswoIc2i45/bx/2HEVYBBs/EQXg/PBDq83VSVGPWkC2ye9xDblTiGgNL7r2AEjIQsu7cOq5MZpy3aAKH0Nx4o3Mo75XLxL+6ovyfN9K/wQQ390o91/56gpsqvoto=;
- 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
Hi,
For one case, I tried to merge actual zones into larger thermal zones. Now, I have to model FCUs, using TemplateHVAC:Zone:FanCoil objects, in such a way that I put one FCU in each zone that must represent 4, 5 or even 11 real FCUs for example. I used the following approach:
1. I used the formula from DesignBuilder website (http://www.designbuilder.co.uk/programhelp/fans.htm) to find Fan Delta Pressure:
Delta P = 1000 * SFP * Fan total efficiency (SFP: Specific Fan Power [W/(L/s)]
I calculated each real FCU's Fan Delta P and added them up to find the equivalent FCU's fan Delta P.
For example:
I have 4 FCU's one for each of 4 guest rooms that I merged into one large room for simplification, the actual HVAC schedules give the following:
FCU No. Power [kW] Air Flow [L/s]
==================================================
1 0.3 160
2 0.3 145
3 0.3 145
4 0.3 145
Eqv. Delta P= 1000*(300[W]/160[L/s]+3*300[W]/145[L/s])*0.7=5657.33[Pa]
2. I found the equivalent FCU's airflow rate by adding the real FCUs' flow rates:
Eqv. Flow Rate=160+3*145=595[L/s]
I used the above values in the HVACTemplate:Zone:FanCoil object for the corresponding zone. The results were that the equivalent FCU's power calculated is 5 times larger (about 6[kW]) than actual component-FCUs' power when added up: