[Equest-users] Process Equipment Power Consumption

[Gaurav Mehta]

Please refer to the Chapter 18, Nonresidential Cooling and Heating Load 
Calculations of the 2009 ASHRAE Handbook of Fundamentals.


Best regards,

Gaurav Mehta

Stantec


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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
>
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