[Equest-users] LS-A/ LS-B report shows no space heating load forsome zones

[Sheldon Mendonca]

Hi Maria and Nick,

Thanks, the reports make more sense now.. There is no under-heating or 
under-cooling hours so that answers my question "if the heat is getting 
to the zones". My SS-A report shows that my systems are working fine 
even in the zones the LS-A reports zero load (internal gains and like).

Thanks a lot for taking the time to clarify this non-issue. I have 
breaking my head on this model that seems to work just fine :)...

Best,
Sheldon

On 9/20/2011 4:34 PM, Maria Karpman wrote:
>
> Sheldon,
>
> Loads in LS-A report (and any other "L*-*" report) account only for 
> envelope and internal gains, but not HVAC-related parameters. I 
> wouldn't expect these loads to change as you adjust reheat or 
> thermostat setpoints. You should check SS-A report instead. The 
> Detailed Simulaiton Reports Summary that Nick suggested below is a 
> great resource for interpreting reports correctly.
>
> Good luck,
>
> Maria
>
> -----Original Message-----
> From: equest-users-bounces at lists.onebuilding.org 
> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Nick 
> Caton
> Sent: Tuesday, September 20, 2011 3:12 PM
> To: sheldon at dsmea.com; equest-users at lists.onebuilding.org
> Subject: Re: [Equest-users] LS-A/ LS-B report shows no space heating 
> load forsome zones
>
> Hey Sheldon,
>
> Zeroes are not always a sign something is wrong...
>
> Typical scenario / possible explanation:  A core zone is surrounded by
>
> other zones with heating equipment.  During design day conditions
>
> (coldest day in the winter), this core zone doesn't actually have any
>
> need for heating because there's zero (or close to zero) heat flux
>
> outward, due to the surrounding conditioned spaces.
>
> "...the heat does not seem to be getting to these zones" is a conclusion
>
> that suggests underheated hours however... is that the case?
>
> Adjusting the thermostat/reheat inputs are examples of *possible*
>
> solutions when there is an underheating symptom, but before proceeding
>
> I'd first confirm there's a problem to be fixed, then try to come up
>
> with clues and causes before resorting random fixes.  Note that
>
> undercooled/underheated hours are always the symptom of another problem
>
> (and a vague clue at best).  Your challenge is not to treat the symptom,
>
> but to identify and resolve what's causing the under conditioned hours.
>
> Another suggestion: review the advice/notes for LS-A and LS-B found in
>
> Help > Tutorials and References > Detailed Simulation Reports Summary.
>
> Best of luck!
>
> ~Nick
>
> NICK CATON, P.E.
>
> SENIOR ENGINEER
>
> Smith & Boucher Engineers
>
> 25501 west valley parkway, suite 200
>
> olathe, ks 66061
>
> direct 913.344.0036
>
> fax 913.345.0617
>
> www.smithboucher.com
>
> -----Original Message-----
>
> From: equest-users-bounces at lists.onebuilding.org
>
> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Sheldon
>
> Mendonca
>
> Sent: Tuesday, September 20, 2011 12:52 PM
>
> To: equest-users at lists.onebuilding.org
>
> Subject: [Equest-users] LS-A/ LS-B report shows no space heating load
>
> forsome zones
>
> Hi all,
>
> My model report LS-A and LS-B shows that some zones do not have any
>
> heating peak loads/heat load components...  I have changed options for
>
> re-heat delta T, T-stat and other options but the heat does not seem to
>
> be getting to these zones. However, the zones beside them seem to be
>
> fine.
>
> Any suggestions??
>
> Thanks,
>
> Sheldon
>
> -- 
>
> Energy Engineer/Analyst
>
> DSM Engineering Associates
>
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