RE: [EnergyPlus_Support] U value Design Builder vs Energy Plus

["Andy Tindale" <andy@xxxxxxxxxxxxxxxxxxx>]

U-values calculated and displayed by DesignBuilder use the UK methodology
including thermal bridging and specific inside and outside heat transfer
coefficients. EnergyPlus uses a more detailed calculation method for
evaluating heat transfer coefficient hence the difference and assumes
standard ASHRAE inside and outside conditions. Bear in mind that the
U-values calculated by DesignBuilder are not used in EnergyPlus simulations.

Andy Tindale,
DesignBuilder Software
www.designbuilder.co.uk

-----Original Message-----
From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]On Behalf Of André Lopes
Sent: 08 May 2008 09:24
To: EnergyPlus Support
Subject: [EnergyPlus_Support] U value Design Builder vs Energy Plus


Dear Energy Plus Team:
When I inserted a certain Exterior Wall the Design Builder calculated a U =
0,54.
After, when I exported the file to Energy Plus and made the simulation, the
EPlus Report showed a U = 0,6. I think that this also happened for all the
other Building Constructions.
What is the reason?
Regards
A L


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