[EnergyPlus_Support] Re: ASHRAE 90.1 compliance for building fabric

["JV Dirkes II" <jvd2pe@xxxxxxx>]

p.s., It just occurred to me to add that my version of 90.1 is the IP
version.  Nonetheless, we agree that there seems to be a U value
that's unexpectedly high for Mass walls.


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "JV Dirkes II" <jvd2pe@...>
wrote:
>
> Dear F,
> 
> My copy of 90.1-2004 shows Assembly Maximum "U" for a "mass"
> above-grade wall = .580 and also that no insulation is required. 
> Might your copy be damaged?  Are you using the proper version? (e.g.,
> 2004)
> 
> For the record, 
> 
> Metal building: U = .113 R=13
> Steel-framed: U = .124 R=13
> Wood-framed: U = .089 R=13
> 
> The "mass" U value does seem a bit out of line, but that may be caused
> by the time-delay impact of the mass.  You may want to ask ASHRAE or
> review some of their standards interpretations online at ashrae.org.
> 
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "mtdagustin"
> <mtdagustin@> wrote:
> >
> > Dear E+ Users,
> > 
> > I am trying to model a non-residential building located at Zone 1 as 
> > defined by ASHRAE 90.1. However, I am not sure if I have
interpreted it 
> > correctly. Table 5.5.1 , "Walls above grade" calls for Assembly
maximum 
> > (Mass) = U-3.292 and insulation R-value is not required. Comparing
this 
> > value with other wall systems i.e. metal building 0.642, steel frame 
> > 0.705 and 0.504 is not comparable.
> > 
> > Could someone enlighten me on this issue.
> > 
> > 
> > regards
> > F
> >
>



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