[Bldg-sim] Missing hourly report values - doe2

[Shaun Martin]

So, what constitutes the system being ON?  Every hour from March to Dec
reports a non-zero value, which suggests that a cycling system is considered
ON. Is it possible it takes from Jan through the end of Feb for the
simulation to stabilize?

I'll check the part-load, maybe there is some threshold before a value is
given.

Shaun
 

-----Original Message-----
From: Joe Huang [mailto:joe at drawbdl.com] 
Sent: Tuesday, November 03, 2009 3:40 PM
To: Shaun Martin
Cc: Bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] Missing hourly report values - doe2

Shaun,

I think you're calling for a hourly value that is computed only when the
system is on. Check the system part-load-ratio to confirm. If you really
need the humidity ratio during those hours, you can take the outdoor HR but
you might need to adjust for the hourly latent heat gain.

Joe

Joe Huang
White Box Technologies, Inc.
346 Rheem Blvd. Suite 108D
Moraga CA 94556
(o) +925 388 0265
(c) +510 928 2683
yjhuang at whiteboxtechnologies.com
www.whiteboxtechnologies.com

Shaun Martin wrote:
> I've never understood why doe2 produces zero values, like in the 
> snippet below. By the time the simulation reached March it reported a 
> good value for every hour through to the end of the year.
> 
> MMDDHH EL1 West   EL1 West
>         Perim Z    Perim Z
>        ZONE       UNIT    
>        TEMP       MIX HUM 
>        F          PERCENT-
>                   RH      
>        ----( 6)   ----(40)
>  1 1 1     69.2     0.0000  <<??
>  1 1 2     70.2     0.0068
>  1 1 3     69.1     0.0000  <<??
>  1 1 4     70.2     0.0066
>  1 1 5     69.5     0.0000  <<??
>  1 1 6     70.2     0.0061
>  1 1 7     69.7     0.0000  <<??
>  1 1 8     70.2     0.0064
> 
> The variable being tracked (mixed air humidity ratio) is supposedly a 
> valid selection for a system type I've used (heat pump).
> 
> Any ideas?
> 
> Thanks,
> Shaun Martin
> 
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