[Bldg-sim] Calibrated Simulations & ASHRAE G14

[David Eldridge]

   RE: [Bldg-sim] Calibrated Simulations & ASHRAE G14

There are probably occupancy variations that took place in the house that
cause variance in the energy usage for the measured case, and it may be
difficult for you to capture those effects in the model.

Other building occupancies (commercial, institutional, etc.) stick more
closely to their typical usage patterns and the benchmark CV should be
achievable in most cases.

It should be for residential also if you have enough data about the usage
to tailor the operating schedules.

You might want to start out with a gas usage and HDD regression to identify
if there are any months that jump out as atypical from your modeling,
irregular usage periods, etc.

DHW could be significant also, maybe you can get water usage data for the
house to see if there were periods when occpuants were using more
showers/sinks/laundry/etc.

One other idea might be to see how sensitive the CV is to the measured ACH,
which could vary during times of the year, not sure if your measurement
covered multiple data points (summer/winter/occpupied/unoccupied).

Hope this helps!

David



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-----Original Message-----
From: *bldg-sim-bounces at lists.onebuilding.org*<bldg-sim-bounces at lists.onebuilding.org>
*[mailto:bldg-sim-bounces at lists.onebuilding.org]*<[mailto:bldg-sim-bounces at lists.onebuilding.org]>On
Behalf Of Hayes Zirnhelt
Sent: Wednesday, January 04, 2012 4:27 PM
To: *bldg-sim at lists.onebuilding.org* <bldg-sim at lists.onebuilding.org>
Subject: [Bldg-sim] Calibrated Simulations & ASHRAE G14

Hi,

Does anyone have experience with calibrated simulations? Especially, in
accordance with ASHRAE guideline 14, or other standards / guidelines.

I've been working on a calibrating and EnergyPlus model to measured gas
HVAC data for a single family house with extensive monitoring and detailed
information available and I am finding it very difficult to achieve the <=
30% CV RSME that Guideline 14 suggests.

I'm surprised that it is this challenging because I have far more
information available than what would likely be available in typical
modelling jobs. Eg. ACH rating, measured ground temperature data, full
as-built plans, indoor temperature measurements....

So I'm curious to hear about anyone else's experiences with this. Is this
guideline generally achievable for modellers?

Thanks,

Hayes Zirnhelt

M.A.Sc Candidate, RU Building Science

B.A.Sc Integrated Engineering

*hayes.zirnhelt at ryerson.ca* <hayes.zirnhelt at ryerson.ca>

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