[Equest-users] Process Equipment Power Consumption

[Carol Gardner]

Whenever you have an equipment, aka process, load it is proper to apply
first a diversity factor, aka % on at one time, and then a schedule. Whether
your building is new or existing doesn't matter. This is an Art not a
Science. Experience is the primary teacher. You can always ask us old farts.
We are relevant and have information that one only can get with time. Yours
to chose to listen to or not.

Peace out,
Carol

On Mon, May 3, 2010 at 9:20 PM, Gaurav Mehta <gmehta75 at gmail.com> wrote:

> Please refer to the Chapter 18, Nonresidential Cooling and Heating Load
> Calculations of the 2009 ASHRAE Handbook of Fundamentals.
>
>
> Best regards,
>
> Gaurav Mehta
>
> Stantec
>
>
> --------------------------------------------------
> From: "Walson, Kristy" <kristy.walson at tlc-eng.com>
> Sent: Monday, May 03, 2010 11:29
> To: <omoltay at mimtarch.com>; <equest-users at lists.onebuilding.org>
> Subject: Re: [Equest-users] Process Equipment Power Consumption
>
>
>  Hi Omer,
>>
>> On recent projects, I have had to pay more attention to the process loads
>> for the types of equipment you mentioned below.  In the past, I would just
>> ensure that my process energy cost was 25% of the total energy cost because
>> I knew that the types of buildings I was modeling (commercial offices,
>> mostly) would never have an actual process load even close to 25%.
>>
>> However, recently I have been modeling process loads in a more exact way.
>> What I do is I take the kW rating of the equipment, then I talk to the
>> electrical engineer to get an idea of whether that equipment will ever run
>> at its rated load and, if not, I apply the appropriate reduction to it based
>> on what the electrical engineer says.
>>
>> Once I have this maximum energy use for process loads in the building, I
>> then create a custom schedule for this process energy.  Sometimes I need to
>> create more than one custom schedule based on the type of equipment in the
>> space.  This can become very tedious if you get too far into the weeds, so I
>> try to keep the schedules realistic, but simple and I keep the number of
>> different custom schedules I create to a minimum.  As we all know, you can
>> never know the actual occupancy and use schedule of a building until it is
>> occupied for a certain period of time, so keep your assumptions simple and
>> logical.
>>
>> I'd love to hear what other folks are doing if it differs from my process.
>>
>> Kristy Walson, PE, LEED AP
>> Mechanical Engineer / Sustainable Design
>>
>> -----Original Message-----
>> From: equest-users-bounces at lists.onebuilding.org [mailto:
>> equest-users-bounces at lists.onebuilding.org] On Behalf Of
>> omoltay at mimtarch.com
>> Sent: Monday, May 03, 2010 1:46 PM
>> To: equest-users at lists.onebuilding.org
>> Subject: [Equest-users] Process Equipment Power Consumption
>>
>> Dear All,
>>
>> One of the things that cause most trouble for us in modelling is the power
>> consumption of equipment such as dishwashers, ovens, food warm-up
>> equipment and so on that have varying levels of power consumption during
>> operation (even PCs and laptops). We are sometimes using nameplate
>> installed kW values, but deep inside we know that this is quite wrong -
>> but we have no other more reliable source / guideline for such equipment.
>> I would appreciate any feedbacks on how others are modelling such
>> equipment.
>>
>> Thank you,
>>
>> Omer Moltay, LEED AP
>> Mimta
>>
>> _______________________________________________
>> Equest-users mailing list
>> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
>> To unsubscribe from this mailing list send  a blank message to
>> EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
>> _______________________________________________
>> Equest-users mailing list
>> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
>> To unsubscribe from this mailing list send  a blank message to
>> EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
>>
>>  _______________________________________________
> Equest-users mailing list
> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to
> EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20100504/5e216d9d/attachment-0001.htm>