[Equest-users] Existing building simulation

[Dan Jestico]

Mo,
 
Depending on the type of building it is very difficult to get an
accurate match between the predicted and actual energy usage. There are
a range of reasons why this can be the case.

*	
	Weather. How does the weather file used relate to the weather
from the measured period? If it was hotter or colder, this will have
implications for the comparison between the two figures.
*	
	Usage. All building simulation tools assume a set period of
occupancy and resultant heat gain - unless you know the occupancy and
equipment usage patterns for each hour of the year, there will be
differences between the two figures. Are there any data centres (and
resultant high power consumption) that have been implemented in the
building but aren't on drawings?
*	
	Operation. Perhaps the biggest cause of potential discrepancy.
Is the actual building being operated in exactly the same way as input
to the software? Commissioning and operation are perhaps the most
important things to get right if buildings are going to produce the kind
of energy savings that us engineers are predicting.
*	
	Sub metering. Has the building been submetered in any way to
allow you to identify where the discrepancies lie? From the graph it
looks like there is additional consumption during warmer months that
isn't being picked up to the same extent by the simulation. 

Sorry not to be of more help, but these are a few of the initial ideas
to consider.
 
Best of luck,
 
Dan.

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Vaziri,
Mo (ON0F)
Sent: 16 March 2010 15:20
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Existing building simulation



If we are doing a simulation for an existing building and the actual
electricity consumption does not match with the simulation, how can we
adjust/calibrate it?

 

The snapshot shows the actual (blue graph) vs. simulation.

 

 

 

Regards,

Mo Vaziri 

 

                                             Honeywell 

Mo Vaziri, P. Eng. , LEED AP, CEM
Design Build / Energy Engineer 
Honeywell Building Solutions - Canada

85 Enterprise Boulevard, Suite 100

Markham, Ontario, L6G 0B5 
*       Phone: (289) 333-1340 
*                 Fax:      (289) 333-1333 
*       Cell:     (416) 527-4692 
*       mohammad.vaziri at honeywell.com
<mailto:pmohammad.vaziri at honeywell.com>  

 

 

 


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