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[EnergyPlus_Support] U value Design Builder vs Energy Plus and Thermal Bridges
OK, but the idea was to make the E Plus U-Value become equal to the DB value.
So, should I increase the insulation on EPlus to decrease the U-value from 0,6 to 0,54?
Another subject, concerning the Thermal Bridges, is the following:
I created sub-surfaces (for instance with an R-Value of 0,005 - > U=200) on DB. Then after exporting to EPlus, it has created the correspondant "opening" for each sub- surface.
Can I use these "openings" EPlus U-values, to contabilize the thermal bridge losses in an EPlus simulation?
Do I have to edit these U-Values until I achieve, for eg. U=200?
Regards
A L
----- Original Message ----
From: Andy Tindale <andy@xxxxxxxxxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Thursday, May 8, 2008 10:20:31 AM
Subject: Re: [EnergyPlus_Support] U value Design Builder vs Energy Plus
I guess you would have to increase the thickness of insulation in DB until
you acheived the E+ U-value you are aiming for.
Andy
----- Original Message -----
From: "André Lopes" <andr_lopes2000@ yahoo.com>
To: <EnergyPlus_Support@ yahoogroups. com>
Cc: <andy@designbuilder. co.uk>
Sent: Thursday, May 08, 2008 10:07 AM
Subject: Re: [EnergyPlus_ Support] U value Design Builder vs Energy Plus
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@designbuilder. co.uk>
To: EnergyPlus_Support@ yahoogroups. com
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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