[esp-r] Re: Heating and Cooling Loads

Wed Sep 9 18:00:46 BST 2009

David and Rodrigo,

Thank you for your help.
I`ve simplify the model and the results of the 3-floor office building  
are:

IES_VE   390 kW (heating) 123 kW (cooling)
ESP-r     246 kW (heating)  205 kW (cooling)

The model conditions of the 3-floor office building are:
IES_VE 390 kW (heating) 123 kW (cooling)

1. Geometry: 3 zones of 25 m x 60 m x 2.5 m high. 40% of glazing ratio  
for all the orientations

2. Orientation: North towards the long side (25 meters)

3. Materials (outside to inside)
3.1 External Wall: cast concrete 0,2m, Polystyrene 0.02m, Gypsum  
Plasterboard 0,01m. U-value = 0.9597 (W/m2K)
3.2 Window: Double glazing, clear float 6mm + 12mm cavity. U- 
Value=2.82 (W/m2K)
3.3 Roof: Cast concrete (lightweight) 0.05m, Polystyrene 0.15m, cast  
concrete 0,15m. U-value = 0.1859 (W/m2K)
3.4 Ground Floor: Cast Concrete 0.15 m, polystyrene 0.05 m, U-value =  
0.5041 (W/m2K)
3.5 Slabs: cast Concrete 0.15, U-value = 3,2558 (W/m2K)

4. Boundary Conditions: All the walls and the roof faces the outside.  
The slabs are interiors and only the ground floor faces the grund.

5. Run Period: 1/1 31/12 (whole year)

6. Internal gains: Occupancy 6 m2/person (70 W Sensible, 35 W latent),  
Lighting 8 W/m2, Equipment 5 W7m2. All the time for the whole year,  
including nights, weekends, etc.

7. Climate file CHL_Santiago_IWEC.epw (from the energyplus database)

8.  Comfort band 20 Cº-24Cº

9. Ventilation: infiltration 0.25 (ach/h), auxiliari ventilatios 3.25  
(ach/h) on ESP-r  infiltration of 3.25 (ach/h)

Thank you again

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 - www.b-green.cl - 56 (2) 3431868

El 9 Sep 2009, a las 00:22, Tang, David escribió:

> 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 - 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>
>> 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 - 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]
>>>> 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
>
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