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

[André Lopes <andr_lopes2000@xxxxxxxxx>]

Thank you Andy
So, how can I solve the problem on E Plus and obtain U = 0,54.
Regards
A L


----- Original Message ----
From: Andy Tindale <andy@xxxxxxxxxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Thursday, May 8, 2008 9:41:56 AM
Subject: RE: [EnergyPlus_Support] U value Design Builder vs Energy Plus


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@ yahoogroups. com
[mailto:EnergyPlus_Support@ yahoogroups. com]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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