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

[Maria Karpman]

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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