[Equest-users] External Light Load

[Nick Caton]

Hi Rakesh,

 

Noting that you've entered 6.41 kW instead of 8.26 mentioned earlier, it
looks like you're using the correct detailed mode inputs.

 

I can't qualify whether 12 hrs every day is "correct" (a fair enough
approximation if everything is 100% photocell controlled*), but you've
recognized to assign a custom schedule as well  so assuming that's put
together correctly (as described previously) you should find your annual
consumption to be 6.41*12*365 = 28,075 kWh

 

If it still turns out lower, I'd verify the schedule has accounted for
holidays/weekends and is in fact 100% for 12 hours daily.

 

~Nick

 

* PS:  Those interested can create a set of photocell-based schedules to
import into their projects that will vary exterior lighting sensitive to
the changing day lengths over the year.  I've posted instructions in a
thread that can be found within the archives.  Search for
"PHOTOCELL-CTRL problem"

 

 

 

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

 

From: rakeshdesai at ecpl.co.in [mailto:rakeshdesai at ecpl.co.in] 
Sent: Sunday, January 22, 2012 10:19 PM
To: Nick Caton; 'Daniel Knapp'
Cc: equest-users at lists.onebuilding.org
Subject: RE: [Equest-users] External Light Load

 

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

 



 

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 <x-msg://1149/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, LEED(r) 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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