Jim �
We looked into this for a distribution center model a few years back.
As we had electric charging, we wanted to characterize the energy use of a bank of roughly 200 charging stations � so we were concerned both with the heat load and with the electric draw.
Attached were some of the resources we found.
The electric lift truck manufacturers’ guidance helped quantify the total kWh of the battery system, per charge / discharge cycle.
The PGE report on lift truck chargers gave us insight into the inefficiencies of the charging process, and the waste heat / vampire load from the charger when not in charge mode.
We consulted with the client to determine the number of charge / discharge cycles per charger per day.
For our heavily-used distribution center, we estimated that electric charging was a significant portion of the building’s energy cost (greater than 20%).
Aaron
Aaron Dahlstrom, PE, LEED® AP
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From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Monday, February 02, 2015 9:59 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Lift truck energy expressed as an internal load
Dru,
That's a valuable insight (impact of charging the lift trucks on demand cost). The report itself is very interesting; I skimmed it and will read it more thoughtfully a bit later.
I will talk to Mike Deru or another of the authors, bit I'm still hoping that others also contribute their knowledge.
On Mon, Feb 2, 2015 at 9:28 AM, Dru Crawley
dbcrawley@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
Jim,
When NREL was working on a low-energy building in Colorado, they found they needed to schedule the charger on the forklift -- or it set the peak demand for the building. Here's a link to the report:
http://www.nrel.gov/docs/fy05osti/34930.pdf I'm sure the authors could provide more insights.
Dru
On Mon, Feb 2, 2015 at 8:54 AM, Jim Dirkes
jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
Dear Forum,
For the first time, it occurs to me that a lift truck used to transport materials inside of a warehouse constitutes an internal load; the work that it does becomes heat
inside the warehouse. This is true for propane and electrical lift trucks; all energy becomes heat eventually.
While it is probably a small load, I am interested in determining its magnitude. Have any of you attempted to quantify it? or have reference materials which do so?
Thanks in advance.
--
James V Dirkes II, PE, BEMP, LEED AP
CEO/President
The Building Performance Team Inc.
1631 Acacia Dr, GR, Mi 49504
Direct: 616.450.8653
jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Website l LinkedIn
The truth is like a lion; you don’t have to defend it. Let it loose; it will defend itself.
--
James V Dirkes II, PE, BEMP, LEED AP
CEO/President
The Building Performance Team Inc.
1631 Acacia Dr, GR, Mi 49504
Direct: 616.450.8653
jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Website l LinkedIn
The truth is like a lion; you don’t have to defend it. Let it loose; it will defend itself.
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