# Unusual QC Errors

3 posts / 0 new

Hello All,

My simulation won't run because of unusual errors that I've never seen
before, but that I picked up when looking at the details of the QC
report:

Here is a summary of the errors. If anyone has seen this before and may
have ideas about what's causing it, I'd really appreciate the help.

I haven't attached the .pd2 and .inp file due to file size, but I can
forward them to anyone who's interested in taking a peek.

Many thanks,

Luka

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4) Hours of Operation

Hours of Operation

Fan vs. Occupancy Hours

The average occupancy /
fan operation ratio for the building is -72480000.00 and appears high
(error above 1.75, see PS-E & SS-C reports).

Fan vs. Lighting Operating Hours

The average hours of
light operation / fan operation ratio for the building is 0 and appears
low (error below 0.25, see PS-E & SS-C reports).

Fan vs. Equipment Operating Hours

The average hours of
plug load operation / fan operation ratio for the building is 0 and
appears low (error below 0.25, see PS-E & SS-C reports).

5) HVAC Equipment Descriptions

Air-Side Checks

CFM/ton of cooling

The supply air flow for
system 'E1 Sys1 (PIU) (B)' is 120000.0 cfm/ton and appears high (see
SV-A report).

User Input Equipment Performance Curves

Curve coefficients sum to 1

The sum of the
coefficients for the 'ForCurve w Inlet Vanes FPLR' curve is 0.99 and
does not equal 1 (check Curve Inputs for errors).

6) Zone Control and Equipment Sizing

Primary Equipment Unable to Meet Loads

Chillers

Chillers on Loop:
'Chilled Water Loop' have a total Capacity to Load Ratio of -1.00 and
may be undersized (Error: Ratio < 0.90)

Total Chiller Capacity on Loop = -2 (Btu/hr)

Peak CHW Loop Load = -1 (Btu/hr)

Chiller: 'Chiller1a (ElCentHerm)' capacity = -1 (Btu/hr)

Chiller: 'Chiller1b
(ElCentHerm)' capacity = -1 (Btu/hr)

Boilers

Boilers on Loop: 'Hot
Water Loop' have a total Capacity to Load Ratio of -0.00 and may be
undersized (Error: Ratio < 0.90)

Total Boiler Capacity on Loop = -2 (Btu/hr)

Peak HW Loop Load = -1 (Btu/hr)

Boiler: 'Boiler1a (HWNatDrft)' capacity = -1 (Btu/hr)

Boiler: 'Boiler1b
(HWNatDrft)' capacity = -1 (Btu/hr)

7) HVAC Load & Performance Results

Monthly Pattern of HVAC Loads

System 'E1 Sys1 (PIU)
(B)' has a high Summer/Winter heating coil load ratio of 1.0 (error over
0.2, see SS-D report).

Primary HVAC Equipment Performance

Average Chiller COP

'Chiller1a (ElCentHerm)'
Average Yearly COP (Total Annual Output/Total Annual Input) = -1.0 and
may be low (Error: Ratio <= 1).

'Chiller1b (ElCentHerm)'
Average Yearly COP (Total Annual Output/Total Annual Input) = -1.0 and
may be low (Error: Ratio <= 1).

Average Cooling Tower COP

'Open Tower' Average
Yearly COP (Total Annual Output/Total Annual Input) = -1.0 may be low
(Error: Ratio <= 1).

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Joined: 2011-09-30
Reputation: 0

Luka-

The errors that you have attached below are not necessarily related to
the reason your simulation is failing. The QC reporting mechanism
relies on results generated during the course of a successful
simulation, and the fact that you are unable to a simulation is the
reason for some of the nonsensical numbers in the QC reporting results.
Check the .sim file for information on why the simulation won't run.

Lukas Hovee

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Joined: 2011-09-30
Reputation: 0

Luke,

Thanks for your help. It turned out to be a problem with the
daylighting. There's still some QC errors, but the values have
definitely changed, so I'm more confident that the simulation is more or
less free of bugs that would prevent it from running.

Luka

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Joined: 2011-09-30
Reputation: 0