[BLDG-SIM] Time Lag and Decrement Factor associated to CTF

[Jeffrey Spitler <spitler@xxxxxxxxxxx>]

Rego,
They came out of the ASHRAE RP-472 work.  You could consult:
1) The final report, available from ASHRAE.
2) Steve Harris' PhD thesis.  (It is available online from UMI
    Proquest Digital Dissertations:
    http://wwwlib.umi.com/dissertations/gateway

Main Author:       Harris, Steven Merrill,
Title:             A study to categorize walls and roofs on the basis of
                      thermal response /
         :         1988

3) There is a 1988 paper by Harris and McQuiston, but at a quick glance, it 
doesn't
     show how the decrement factors were derived:
A study to categorise walls and roofs on the basis of thermal response
AUTHOR: Harris S M., McQuiston F C.
CITATION: ASHRAE Trans. 1988, vol.94, Part 2, 688-715, 4 figs, 6 tabs, refs.
KEYWORDS: Walls, roofs, heat flow, thermal inertia
YEAR: 1988

I hope this helps.

Best wishes,
Jeff Spitler








At 08:36 PM 11/26/2003 +0000, António Rego Teixeira wrote:
> Anyone know how are calculated the time lag (TL) and decrement factor (DF) 
> associated to roof and wall conduction transfer functions, listed in 
> Tables 14 and 19, Chapter 28, 1997 ASHRAE Handbook -- Fundamentals, SI Edition?
>
> Thank you.
>
> Rego Teixeira
> INETI
> Lisbon, Portugal
>
>
>
>
>
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Jeffrey D. Spitler, Ph.D., P.E.
C.M. Leonard Professor
School of Mechanical and Aerospace Engineering
Oklahoma State University

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