[Equest-users] How to do LPD calculations in eQUEST

[via Equest-users]

I’d also insert:

 

1.       There is no functional or accuracy advantage to entering lighting loads as an LPD once you know and have entered the loads as kW.  In fact, there is the possibility you’ll accidentally leave both inputs entered, which will end up doubling the lighting loads (these inputs are additive).  

2.       If your purpose is to determine the lighting power density for the entire building, here’s the method I presently use as a balance of efficiency/accuracy:

a.       File à Export File àSpace Loads Report (CSV)  [and Open it when the dialog comes up]

b.      Note the Activity Description column, if your project was generated via the Wizards, you should probably observe a consistent marker for your plenum spaces: “(unknown)”

c.       Use some if/then logic in excel to sum lighting power installed outside plenums, and then divide by the associated sum area.  (note space area is a separate column available).

 

Best of luck!

 

~Nick

 

 

Nick Caton, P.E.

  Senior Energy Engineer
  Energy and Sustainability Services
  North America Operations
  Schneider Electric

D  913.564.6361 
M  785.410.3317 
E  nicholas.caton at schneider-electric.com <mailto:nicholas.caton at schneider-electric.com> 
F  913.564.6380

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

 

 

 

From: Equest-users [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Rathna Shree via Equest-users
Sent: Monday, June 27, 2016 6:34 AM
To: Sharad Kumar; equest-users; equest-users-request at lists.onebuilding.org
Subject: Re: [Equest-users] How to do LPD calculations in eQUEST

 

Hi Sharad,

 

Alternatively, once you enter the lighting power KW, you can just use the user expression : LOCAL("LIGHTING-KW")*1000/LOCAL("AREA"), the LPD will get updated by itself.

 

Regards,

Rathnashree

 

On Saturday, 18 June 2016 8:37 PM, Sharad Kumar via Equest-users <equest-users at lists.onebuilding.org> wrote:

 

Dear equest users,

 

Today morning after doing the LPD calculation in excel i discovered something that is LPD calculation in eQUEST 3.65 which can be new for few or many people.

 

This can be implemented when one know the Lighting power of the fixture and number of fixtures.

 

There is a very innocent way to do it that is we can multiply the number of fixtures and lighting power in calculator and then input the lighting load in kW in the internal load where there is space for lighting power.

 

Then we can come up with the lighting power density in the corner space of the same window.

 

After this one can remove the lighting loads in kW and put in watts per square feet that is the lighting power density.

 

I will have the snapshot of the same dialogue.

 

 

 

 

 

 

We can come up with the above snapshot that the 0.012 kW results in 0.044 watts per square feet of LPD which can be treated as LPD calculation by me. The actual area in the model calculates it.

 

 

Thanks,

Sharad.Kumar|Engineer.

Green Horizon Consulting LLP.

Gurgaon.

India.

 


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