[esp-r] Re: esp-r and thermal lag

[Geissler Achim]

Hi Pat,

 

as far as I know, the combination of 1 and 2 you state is the only current possibility: You create the individual layer properties in an insulating glazing unit in Win5 or WIS - that is absorption, reflection and transmittance. Then you use these individual layer properties to build an advanced optical database entry for optical properties. The materials in the constructions database are for thermal properties only. In other words, ESP-r needs both databases for the full description of a TMC. The optical entry is linked to the thermal entry.

 

The argon or whatever is simply entered by setting the cavity resistance (in the constructions data base) to the according value (the value that leads to your desired U-value).

 

The other question you had in regard to stud walls: The simple approach is to enter the construction without the studs with a U-value that reflects the actual mean U-value including the studs. The next detailing step is to split the wall in appropriate fractions and enter the constructions accordingly (X % unstudded wall with the uncorrected-for-studs U-value and Y% Stud-region). The most detailed method would be to use the "3d-capability" of ESP-r (however, that is one of the more obscure capabilities and I have no idea if it still works. Some versions ago I did succeed in getting an example that uses that feature to run, though ... see thesis by Abdullatif E. Nakhi)

 

Best regards

Achim Geissler

 

________________________________

From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of pat mc cormack
Sent: Wednesday, May 30, 2007 3:07 PM
To: esp-r at lists.strath.ac.uk
Subject: [esp-r] esp-r and thermal lag

 

Thanks for all the help to date folks,
Couple of more questions,
Is it possible to use esp-r to calculate the thermal lag of a multilayer wall section? Perhaps someone could point me at some literature on it? 
also 
I'm trying to take glazing information from LBNL's window program Win 5.2 into esp-r. There are some version 4 instructions that I read but I can't find them again! Any pointers?

As a general rule is it better to: 
1) use something like win5 to calculate the properties of a multilayer assembly - in this case triple glazed lo-e argon gap- and then inject the whole assembly into esp-r? or:
2) create the construction in the constructions database in esp-r having put the individual elements' properties in the advanced optics database in esp-r. In the second case how do I select argon/krypton etc as the gap? 

Thanks
Pat McCormack

-- 
"Government is not reason, it is not eloquence, it is force; like fire, a troublesome servant and a fearful master. Never for a moment should it be left to irresponsible action." 
-- George Washington
(1732-1799) Founding Father, 1st US President, 'Father of the Country'
Source: in a speech of January 7, 1790 

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