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I have a simple model with an exterior window. I use Radiance for daylighting simulation. I run the baseline model (south orientation) and different orientations (45, 90, 180, ...) with PAT. Every time I run the same model, the values that I receive for "zone lights total heating energy" is different ! For example it changes from 300 kWh to 420 kWh for the same model. Even if I run the model with OpenStudio Application instead of PAT for one of the models, the value of the output is not the same! what is the reason and how can I be sure which results are correct?

Thanks

I have a simple model with an exterior window. I use Radiance for daylighting simulation. I run the baseline model (south orientation) and different orientations (45, 90, 180, ...) with PAT. Every time I run the same model, the values that I receive for "zone lights total heating energy" is different ! For example it changes from 300 kWh to 420 kWh for the same model. Even if I run the model with OpenStudio Application instead of PAT for one of the models, the value of the output is not the same! what is the reason and how can I be sure which results are correct?

Thanks

I have a simple model with an exterior window. I use Radiance for daylighting simulation. I run the baseline model (south orientation) and different orientations (45, 90, 180, ...) with PAT. Every time I run the same model, the values that I receive for "zone lights total heating energy" is different ! For example it changes from 300 kWh to 420 kWh for the same model. Even if I run the model with OpenStudio Application instead of PAT for one of the models, the value of the output is not the same! what is the reason and how can I be sure which results are correct?

Thanks