[Bldg-sim] Solar gains differences between Design Builder and IES VE....

[Andy Tindale]

David,

One thing to check is the definition of solar gain in the 2 programs. For example, in DesignBuilder EnergyPlus the solar gain reported is the gross solar gain, including any solar heat that is subsequently re-reflected back out of the windows. I don't know the definition of solar gains in IES VE, but if it displays the net solar gain then this might explain the difference, especially in zones with large areas of glazing where re-reflection is more significant.

Regards,

Andy

Andy Tindale
DesignBuilder Software ltd
www.designbuilder.com
Tel: +44 (0)1453 755500

From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of David GARCIA-SANCHEZ
Sent: 23 November 2012 13:23
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Solar gains differences between Design Builder and IES VE....

Dear group,

In our current projects we noticed a big difference when modeling solar gains between the software IES VE and Designbuilder (EnergyPlus). IES VE underestimate the values of solar gains, by almost 1 to 2 of difference than EnergyPlus,

So I just try to ask if someone of you are experienced the same difference and if you know the reasons of that big difference. We test a "cell-test" and we found also this underestimation of solar gains.

Thanks in advance,

David Garcia Sanchez

[cid:image001.png at 01CDC98B.923B0130]

David GARCIA-SANCHEZ
greenaffair
Tel. +33 (0)1 46 03 80 10
Mobile +33 (0)6 78 15 08 09
102 avenue Edouard Vaillant - 92100 Boulogne-Billancourt
www.greenaffair.com<http://www.greenaffair.com/>



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