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Dear all. thank you very much for you suggestions and I apologize because in the first post I talked about VAV instead of CAV. In particular I have a single duct CAV with reheat. The building is located in Milan and has significant internal gains (lighting, equipment, occupancy…) and there aren't internal airflows between cooled zones or they are very low. I attach the results of the temperature in a typical summer week with daily outside temperature higher than 30°C.

As you can see the internal temperature is lower than 22°C. If I simulate a VAV system the internal temperature is 26°C according to the schedule. I have check all the input of the system and seem correct. It’s like the cooling air of the CAV system was too cold and was not controlled by the activity schedule.

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