[esp-r] Re: Heating and Cooling Loads

Wed Sep 9 05:55:47 BST 2009

This is a very general topic. Assuming that you do not make any input mistakes, the comparison will depend on the input data, model complexity and algorithms used.
I did a bit of work during my PhD on model equivalencing and I used ESP-r and EnergyPlus (plus some simplified methods). For a specific set up and when you do not make any mistakes the two programs give results that are quite close to each other. However, the models were generally restricted to rules.
Of course, this can not be generalised.
For more info have a look at chapter 5 of my thesis: http://strathprints.strath.ac.uk/7816/

Regards,
Georgios

________________________________________
From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] On Behalf Of Tang, David [David.Tang at owenscorning.com]
Sent: Wednesday, September 09, 2009 12:22 PM
To: Felipe Durán; leen peeters; Tang, Kevin; Xing, Nina
Cc: esp-r at lists.strath.ac.uk
Subject: [esp-r] Re: Heating and Cooling Loads

Describe your model we'll run DOE2 and EnergyPlus to see who's right.

geometry,
orientation
wall, window, roof materials,
boundary conditions (is the wall contact outside, ground, other indoor space?)
run period (from mm/dd to mm/dd),
etc.
as detail as possible.

Regards,

David Tang
Chief Engineer, Energy Solutions
Owens Corning
T: +86 21 6101 9587; F: +86 21 6101 9588; m: +86 13817249419

From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of Felipe Durán
Sent: Wednesday, September 09, 2009 5:10 AM
To: leen peeters
Cc: esp-r at lists.strath.ac.uk
Subject: [esp-r] Re: Heating and Cooling Loads

Leen,

I am working with the EPW climate file of Santiago de Chile in both soft wares. I ve modelled a zone of 10 x 10 x 3 mt. high with no ventilation and no internal gains. The results are:

ESP-r = 11.9 (heating), 1.86 (cooling)
IES = 14.6 (heating), 5.2 (cooling)

Now we got great differences in the cooling load. IES gave me 3 times more cooling loads than ESP-r

Any ideas how to go proceed?

Felipe Durán Palma
Arquitecto PUC, MPhil. U. Cambridge
Director de Proyectos y Asesorías

Obispo Donoso 5 oficina 62 - Providencia - Santiago
felipe at b-green.cl<mailto:felipe at b-green.cl> - www.b-green.cl<http://www.b-green.cl> - 56 (2) 3431868

El 8 Sep 2009, a las 16:49, leen peeters escribió:

Felipe,

set you climate to some artifical constant climqte with constant temperature, constant solar radiation,... That is one more set of variables excluded

Leen

2009/9/8 Felipe Durán <felipe at b-green.cl<mailto:felipe at b-green.cl>>
Dear Samuel and Leen,

Actually, when I found out such big differences I ve modelled a very simple 3-zone model and the differences persist.

I will try out with a simple box without ventilation and internal gains and I will let you know the results.

Thank you all for your help.

Felipe Durán Palma
Arquitecto PUC, MPhil. U. Cambridge
Director de Proyectos y Asesorías

<pastedGraphic.tiff>

Obispo Donoso 5 oficina 62 - Providencia - Santiago
felipe at b-green.cl<mailto:felipe at b-green.cl> - www.b-green.cl<http://www.b-green.cl/> - 56 (2) 3431868

El 8 Sep 2009, a las 13:19, Aizaz Samuel escribió:

Try reducing your model complexity by modelling just one zone with minimal
information possible. Simulate for just one day. If the two softwares compare
well keep building up the model in complexity.

-Aizaz

On Tuesday 08 September 2009 17:41, Felipe Durán wrote:
Dear All,
I am modeling in both ESP-r and IES-VE and office building and the results
for heating and cooling loads are very different.

 ESP-r = 269 kW (heating); 237 kW (cooling)
IES-VE = 835 kW (Heating); 360 kW (cooling)

 Does anyone had a similar experience with such differences?

Kind Regards,

Felipe Durán Palma
Arquitecto PUC, MPhil. U. Cambridge
Director de Proyectos y Asesorías
[cid:B9AD3F91-76F4-4F37-8A2C-7A559281C059<http://mail.google.com/mail/?ui=2&ik=8c428781db&view=att&th=1239aec006a1c658&attid=0.0.1.1&disp=emb&zw>]
Obispo Donoso 5 oficina 62 - Providencia - Santiago
felipe at b-green.cl<mailto:felipe at b-green.cl><mailto:felipe at b-green.cl> -
www.b-green.cl<http://www.b-green.cl><http://www.b-green.cl<http://www.b-green.cl/>> - 56 (2) 3431868

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