[Bldg-sim] Missing hourly report values - doe2

[Joe Huang]

Shaun,

In DOE-2 lexicon, ON means there was a load requiring the system to be 
turned on at some point during that hour, the amount is indicated by the
part-load-ratio, 1.0 meaning completely on, 0.0 meaning completely off 
that hour. I'm sure the hourly cycling you're seeing is NOT for the
simulation stabilizing. I have seen such cycling on occasion, but
mostly with ventilation, not heat pump operations. What did you put
for the throttling range?

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:
> 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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> 
>