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Why the Site Direct Solar Radiation Rate per Area is smaller than the Surface Outside Face Incident Sky Diffuse Solar Radiation Rate per Area

I was modeling a shoebox office with two windows facing the south using EnergyPlus, the windows are two vertical plane. However, when I extract the hourly report, I found the Site Direct Solar Radiation Rate per Area is smaller than the Surface Outside Face Incident Sky Diffuse Solar Radiation Rate per Area at some hours. I didn't understand why this happened really.


Below is the picture of the model: image description

Below is the results: image description

Why the Site Direct Solar Radiation Rate per Area is smaller than the Surface Outside Face Incident Sky Diffuse Solar Radiation Rate per Area

I was modeling a shoebox office with two windows facing the south using EnergyPlus, the windows are two vertical plane. However, when I extract the hourly report, I found the Site Direct Solar Radiation Rate per Area is smaller than the Surface Outside Face Incident Sky Diffuse Solar Radiation Rate per Area at some hours. I didn't understand why this happened really.


Below is the picture of the model: image description

Below is the results: image description

Why the Site Direct Solar Radiation Rate per Area is smaller than the Surface Outside Face Incident Sky Diffuse Solar Radiation Rate per Area

I was modeling a shoebox office with two windows facing the south using EnergyPlus, the windows are two vertical plane. However, when I extract the hourly report, I found the Site Direct Solar Radiation Rate per Area is smaller than the Surface Outside Face Incident Sky Diffuse Solar Radiation Rate per Area at some hours. I didn't understand why this happened really.


Below is the picture of the model: image description

Below is the results: image description

Why the Site Direct Diffuse Solar Radiation Rate per Area is smaller than the Surface Outside Face Incident Sky Diffuse Solar Radiation Rate per Area

I was modeling a shoebox office with two windows facing the south using EnergyPlus, the windows are two vertical plane. However, when I extract the hourly report, I found the Site Direct Diffuse Solar Radiation Rate per Area is smaller than the Surface Outside Face Incident Sky Diffuse Solar Radiation Rate per Area at some hours. I didn't understand why this happened really.


Below is the picture of the model: image description

Below is the results: image description