My PS-F reports for fuel use is in Gallons with peak demand in Gallons/Minute.
My PS-E reports for fuel use is in MBTU with peak demand in MBTU/Hr.
The dropdown menus in the LEED online forms don't give you the option to input fuel capacities in Gallons or MBTU. Hence my confusion.
For LEED online
My units of energy = kbtu
My units of demand = MBH
SO the conversions need to be done as follows for entry to leed online...
fuel use: 5893.5 MBTU - kbtu
The conversion for demand: 2.0 MBTU/HR - MBH
At first I thought 1 MBTU = 1 million BTU's ??
But looking at my summary reports I see the MBTU fuel use at 5.8935 on the graph, then it sais: (x000,000,000)
This implies that 1 MBTU = 1 Billion BTU's but I'm not sure if this is correct?
Plus, my brain hurts.
Chris Baker
CCI CAD Drafter
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Chris,
One thing you can check to help make sense of the conversions is the Fuel Meter Properties screen for your liquid fuel.
It shows the thermal value used in the model. For example, the default for diesel is 138,700 Btu/gallon, as shown in the screen shot below.
[cid:image003.png at 01D0AFF1.50704AE0]
Also, compare the PS-E report to BEPS. The quantities should match and you have the additional metric of EUI in KBTU/SQFT-YR based on the conditioned area shown elsewhere in the reports such as on LS-C. This shows you that MBTU on PS-E and BEPS is MMBTU or million BTU versus KBTU which is thousand BTU.
Hope that helps. Have a great weekend!
~Bill
William Bishop, PE, BEMP, BEAP, CEM, LEED AP | Pathfinder Engineers & Architects LLP
Senior Energy Engineer
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134 South Fitzhugh Street Rochester, NY 14608
T: (585) 698-1956 F: (585) 325-6005
bbishop at pathfinder-ea.com www.pathfinder-ea.com
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Thank you Ari and Bill!
I figured MBTU was million BTU. The thing that threw me off was that summary report showing 9 zeros! But that was single digits too which means both translate to 5.8935 billion BTU?s.
Or 5,893.5 MBTU like you say!
See my attached PSE report for Fuel Meter 1. It sais..
MBTU 5893
MAX MBTU/HR 2.0
MON/DY 1/13
PEAK ENDUSE 2.0
PEAK PCT 100
So wouldn?t this translate to 2.0 referring to MBTU/HR and not KBTU/HR?
It just doesn?t show the units of demand on BEPS or PS-E reports (just sais ?peak enduse?). But the number (2.0) is the same as max MBTU/HR so I assumed that to be the unit of demand.
I should note that this project is in Alaska so the fuel usage in the baseline is higher than normal. The models go through -40 to -50 temperatures at one point for heating.
So it definitely puts a big demand on the PSZ systems.
Fortunately, I already had my ?fuel meter type? to fuel-oil in both models and my BTU/unit is already good to go also (like Bill showed in his screen capture).
-Chris
Hi Chris,
I want to add something.
One can check the peak demand of any hour for the month with the help of
following snapshot:
[image: Inline image 1]
This is as per the model files sent yesterday on equest-users. It has peak
fuel demand of 1.45 X 10 ^ 6 Btuh for the first hour of the month of
January (checked from the CSV exported hourly result file).
Also you can check that this comes from the reports tab in the result view
mode.
Similarly you can check the number of zeros in the peak demand from your
present model files as you might have made changes.
The same 1.45 X 10 ^ 6 has been reflected as 1.4 MBTU/HR in PS-E report in
yesterday's model.
So you are right with 5893.5 MBTU= 5.89 X 10 ^ 9 BTU. Here in PS-E report
MBTU means million BTU.
And also the peak end use is nothing but peak demand.I am not that sure
what is the difference but the other reports suggests me that.
Thanks,
Sharad.Kumar
Green Horizon Consulting LLP
Gurgaon.
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