[Equest-users] External Light Load

[rakeshdesai at ecpl.co.in]

Hi Nick,

 

In detailed wizard, I entered exterior lighting load which is in kW. I am
attaching snapshot file of the same. I have also made schedule so that it
operates for 12 hours per day.

 

Is it correct?

 

Rakesh 

 

From: Nick Caton [mailto:ncaton at smithboucher.com] 
Sent: 20 January 2012 20:51
To: Daniel Knapp; rakeshdesai at ecpl.co.in
Cc: equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] External Light Load

 

Hi Rakesh,

 

In wizards you are forced to enter exterior lighting in units of W/SF.  In
detailed edits we can more intuitively enter the load in kW units.

 

In wizards, divide watts (8,260W in this case) by the area of the shell
under which you are defining the exterior lighting load - use the area
displayed in the zone/footprint definition screen for reference.  Note with
multiple shells the resulting figure may seem otherwise entirely arbitrary
but this procedure will result in the correct lighting load (slight
deviations of rounding notwithstanding).

 

I would take care to define exterior lighting only once under (i.e. under a
single shell) if you have multiple shells.  You may end up with a multiplier
on your external loads if you copy shells and forget to turn them off after
the first shell.  If you wish to define multiple/distinctly-scheduled
exterior lighting loads, I would wait to do that in detailed edits where
it's (a) more intuitive and (b) you can assign those distinct schedules.

 

~Ncik

 

cid:489575314 at 22072009-0ABB

 

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

 <x-msg://1149/www.smithboucher.com> www.smithboucher.com 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Daniel
Knapp
Sent: Friday, January 20, 2012 9:05 AM
To: rakeshdesai at ecpl.co.in
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] External Light Load

 

The external lighting entry is watts/square foot of floor area, not total
watts.

 

Cheers,

Dan

 

-

Daniel Knapp, PhD, LEEDR AP O+M

danielk at arborus.ca

 

Arborus Consulting

Energy Strategies for the Built Environment

www.arborus.ca

76 Chamberlain Avenue 

Ottawa, ON, K1S 1V9 

Phone: (613) 234-7178 ext. 113

Fax: (613) 234-0740

 

 

 

On 2012-01-20, at 1:11 AM, <rakeshdesai at ecpl.co.in> <rakeshdesai at ecpl.co.in>
wrote:

 

Hi,

 

I put external light of 8.26 kW which is operating for 12 hours per day and
for 365 days in year. As per simple calculation, the energy consumption of
external lighting should be 8.26 kW X 12 Hours X 365 Days = 36179 kWh/annum.

 

However, when I run the model, I got 3046692 kWh/annum. I checked the
schedule and it is ok.

 

What could be wrong?

 

Rakesh

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