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





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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