[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[EnergyPlus_Support] Surface Covection Algorithm - Thermal / Visible Absorptance
- To: EnergyPlus_Support@xxxxxxxxxxxxxxx
- Subject: [EnergyPlus_Support] Surface Covection Algorithm - Thermal / Visible Absorptance
- From: "seanr53" <sean@xxxxxxxxxxxxxxx>
- Date: Thu, 21 May 2009 21:15:27 -0000
- Delivered-to: mailing list EnergyPlus_Support@xxxxxxxxxxxxxxx
- Delivery-date: Thu, 21 May 2009 15:15:54 -0600
- Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yahoogroups.com; s=lima; t=1242940553; bh=W4z8AzU7V6VMgtpzrpkR+5wWmw+dcckoZmIxktYYKLE=; 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=kzSKJRLnZYGi2Fq/Y7onW8qUKOGF3WgHGcfZYF1lQblWMC+pA/PCuEHQBz/4HdOsjTKh511XTlJEQncL9B+A69WSz156iggUaD1sTaXNfdZiAcME7RlDIS3gdGlyiKw5
- Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=lima; d=yahoogroups.com; b=sFkczTVbsP2xuGMBPhbCZ63rjDPHQxHHGtFzUEotYE5ol7/LSwfujJqNM+N8gcKAHs99D99y6ahuWTLcMu1JpfaO3aPHKbbDZfkC54c4m9CyRqAKV3woEQ9/fAVz/Mws;
- 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
I have been attempting to simulate (using designbuilder) the performance of a lightweight, uninsulated, galvanised steel roof with a painting system with the following performance parameters:
Solar absoptance = 0.15
Thermal absoptance = 0.1
The roof is over an an unconditioned, naturally ventilated space. I have made a parametric run, using the same roof construction, but with the following surface characteristics:
Solar absoptance = 0.9
Thermal absoptance = 0.5
I have run the simulations using the detailed convection algorithm option, however, my issue is that, despite the different surface characterisitcs of the two models, the simulation results, with respect to roof fabric gains, and internal radiant temperatures are the same.
How do the EnergyPlus convection algorithms take into account radiant heat transfer, as the algorithms don't seem to account for any variations in solar or thermal absoptance?
Or have I missed something ?
Regards,
Sean
------------------------------------
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 not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
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:
mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx
mailto: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/