Dear Pierre,
1. You are correct: For the Generic Solar System model, the Solar Field Thermal Output variable should be labelled as "Solar Field Incident Thermal Power." We will correct this in the next version of SAM.
2. For the Generic Solar System model, SAM calculates and reports the total solar field thermal losses based on the "Generalized Thermal Losses" parameters you specify on the Solar Field page. It does not calculate separate receiver losses as the linear Fresnel and trough models do.
Best regards,
Paul.