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Re: [EnergyPlus_Support] Re: Material Properties
Please note that if you use the R-value only option, you are not
accounting for thermal storage properties of the layers (it assumes that
the construction has little heat capacitances and the heat flow is not
delayed).
Alex Lekov
josep.sole@xxxxxxxxxxx wrote:
> R = thickness / Thermal conductivity
> Then if you know thermal conductivity you can "calculate" R or vice versa.
>
>
> JOSEP SOLE
> Dirección Tecnica POLIGLAS
> nueva dirección mail : josep.sole@xxxxxxxxxxx
>
> -----Mensaje original-----
> De: chillarrahul [mailto:chillar@xxxxxxxx]
> Enviado el: lunes, 19 de julio de 2004 16:55
> Para: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Asunto: [EnergyPlus_Support] Re: Material Properties
>
>
> Hello
>
> In this case i can suggest 3 options:
>
> First you can break your 4 inch insulation into two insulation layers
> of 1 inch and 3 inch and specify the properties from the dataset ,
> or something like that and proceed ahead.
> Second is that you can look up the properties in some material
> handbook and just replace the required fields.
> Third is if you simply have the R value of the material ,(use the
> Material-R field, in this case you wont require the thickness of the
> material)
>
> Hope this helps
>
> Thanks
> Rahul Chillar
> Grad Research Assistant, Building Systems Lab
> Mechanical Engineering , University of Illinois - UC
>
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> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "khizir_mahmud"
> <khizir_mahmud@y...> wrote:
>
>>Hi
>>
>>Thanks for the guideline of finding the values of the building
>>material properties . Now I am working with the following materials
>>
>>1. 0.5 mm galv. steel sheet
>>2. Insulated Polyurethane (3 in)
>>3. Insulated Polyurethane (4 in)
>>
>>From the BLASTMaterials.idf file i got the following properties ,
>>
>>1. MATERIAL:Regular,METAL - GALVANIZED STEEL 1 / 16 IN, !-
>
> Material
>
>>Name
>> Smooth, !- Roughness
>> 1.6000000E-03, !- Thickness {m}
>> 45.31000 , !- Conductivity {w/m-K}
>> 7833.020 , !- Density {kg/m3}
>> 500.0000 , !- Specific Heat {J/kg-K}
>> 0.9000000 , !- Thermal Emittance
>> 0.2300000 , !- Solar Absorptance
>> 0.2300000 ; !- Visible Absorptance
>>
>>2. MATERIAL:Regular,INS - EXPANDED POLYURETHANE R11 3 IN, !-
>>Material Name
>> VeryRough, !- Roughness
>> 7.0000000E-02, !- Thickness {m}
>> 2.0000000E-02, !- Conductivity {w/m-K}
>> 32.03000 , !- Density {kg/m3}
>> 1580.000 , !- Specific Heat {J/kg-K}
>> 0.9000000 , !- Thermal Emittance
>> 0.5000000 , !- Solar Absorptance
>> 0.5000000 ; !- Visible Absorptance
>>
>>
>>
>>But i didnt get the properties of polyurethane 4 in . How can i
>>manage the properties of Polyurethane 4 in ?
>>
>>And the Galv steel is 1/16 in ( 1.58 mm ). so how can i get the
>>values of Galv.steel which is 0.5 mm ?
>>
>>And what is the procedure of getting the properties of the material
>>which is not listed in the BLASTMaterials.idf file ?
>>
>>Could anybody help me in this regard .
>>
>>thank you
>>
>>khizir mahmud
>>
>>
>>
>>
>>
>>--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "chillarrahul"
>><chillar@u...> wrote:
>>
>>>Hi
>>>you will find the standard properties of your materials in the
>>>DataSet Folder where EnergyPlus is installed, when you reach data
>>>sets open up BLASTMaterials.idf in notepad and search for your
>>>materials , you will find the required properties of various
>>>materials in the dataset folder.
>>>
>>>Thanks
>>>
>>>Rahul Chillar
>>>Grad Research Assistant, Building Systems Lab
>>>Mechanical Engineering , University of Illinois - UC
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Khizir Mahmud
>>><khizir_mahmud@y...> wrote:
>>>
>>>>Hi All
>>>>
>>>>In material-regular catagory i am working with two objects.
>>>>
>>>>1. 0.5 mm galv. steel sheet
>>>>2. Insulated Polyurethane (125 mm)
>>>>
>>>>Is there any energyplus recommended material guideline ? Or is
>>>
>>>there any standard source from where we could collect the value
>
> of
>
>>>the material properties. Could anyone help me in this regard.
>>>
>>>>
>>>>Thank you
>>>>
>>>>Khizir Mahmud
>>>>
>>>>
>>>>
>
> _________________________________________________________________
>
>>>>Khizir Mahmud
>>>>
>>>>e-mail: khizir_mahmud@y...
>>>> khizir_mahmud@h...
>>>>
>>>>
>>>>
>
> _________________________________________________________________
>
>>>>
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