Re: [EnergyPlus_Support] what's the difference between "incident solar radiation rate per area" and "solar radiation heat gain rate"?

["Linda Lawrie linda@xxxxxxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

If you search the documentation you will find (from the
Input Output Reference):

Surface Outside Face
Solar Radiation Heat Gain Rate [W]
Surface Outside Face Solar Radiation Heat Gain Rate per Area [W/m2]
Surface Outside Face Solar Radiation Heat Gain Energy [J]
These "outside face solar radiation" output
variables describe the heat transferred by the
absorption of solar radiation at the
outside face. This is the result of incident solar radiation
being absorbed at the surface face. The values are always
positive.

Surface Outside Face Incident Solar Radiation Rate per Area
[W/m2]
The total solar radiation incident on the outside of an exterior
surface. It is the sum of:
Surface Outside Face Incident Beam Solar Radiation Rate per Area
Surface Outside Face Incident Sky Diffuse Solar Radiation Rate per
Area
Surface Outside Face Incident Ground Diffuse Solar Radiation Rate per
Area
Surface Outside Face Incident Sky Diffuse Surface Reflected Solar
Radiation Rate per
Area
Surface Outside Face Incident Beam To Beam Surface Reflected Solar
Radiation Rate
per Area
Surface Outside Face Incident Sky Diffuse Surface Reflected Solar
Radiation Rate per
Area

At 07:18 AM 2/7/2015, hope.zh@xxxxxxxxx
[EnergyPlus_Support] wrote:


> I have the following output
> values for a given exterior surface:
>
> SURFACE 180:Surface Outside Face Incident Solar Radiation Rate per Area
> [W/m2](Hourly) 28.3352952 
> SURFACE 180:Surface Outside Face Solar Radiation Heat Gain Rate
> [W](Hourly) 178.5123598 
> SURFACE 180:Surface Outside Face Solar Radiation Heat Gain Energy
> [J](Hourly) 642644.4951 
> SURFACE 180 total area (include window) [m2] 15 
> SURFACE 180 total area (without window) [m2] 9 
>
> It seems that "
> Surface Outside Face Incident Solar Radiation Rate per Area" is not
> equal to "Surface Outside Face Solar Radiation Heat Gain Rate"
> divided by the area of the surface, either it's 15m^2 or 9m^2.
>
>
> So, may I ask what do the two output variables actually mean, and what's
> the difference between them?
>
>
> Thank you!
>
>
>

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Posted by: Linda Lawrie <linda@xxxxxxxxxxxxxx>

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