[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[EnergyPlus_Support] CTF calculation with multilayer assemblies

Hello -

I've been looking into the conduction transfer equations, and I have a quick question which I hope someone can clarify.

The engineering reference (p.23 of v.4) refers to a wall assembly and treats it as a two-node circuit connected to internal and external temperatures.  This, I believe, assumes a homogeneous wall assembly because C is rho*Cp*l*A/2 (half of the assembly for each side).  My question is: when E+ gets a multi-layer assembly does it string together a line of these resistance/capacitance circuits - or does it calculate an equivalent bulk resistance and capacitance for the assembly and use the two-node model?  Looking at the Surface Output Variables in the InputOutput reference I see outputs for surface inside temperature and surface outside temperature, but not for temperatures at interior layers of the assembly.  If it does make the full string of resistance-capacitance nodes - how can we access the internal temperatures of the assembly?

cheers

dave


David Bosworth
Research Assistant
Program in Computer Graphics
Cornell University
Ithaca, New YOrk


------------------------------------

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/