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ASHRAE 90.1-2007 App G PRM G3.1.2.4
 
  
 
  
 
 
 
 
 
 
    
        
        asked 8 years ago  
 
 Sean King's avatar  
 
 
 
 
    
        
        updated 8 years ago  
 
 __AmirRoth__'s avatar  
 
 
 
 
 
As I have searched web and try to understand the 90.1 clause G3.1.2.4, the system needs to use night cycle and keep outdoor air flow rate to zero. I therefore just have a simple question, if above understanding is right, how re-circulation (no outdoor air) alone to meet the cooling/heating loads from zones during unoccupied hours? Do coils work as well during night cycle?
Thank you very much in advance for any reply.
 
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        answered 8 years ago  
 
 TaylorRoberts's avatar  
 
 
 
 
 
During unoccupied hours the outdoor air damper should close and then the unit should cycle on and off to meet the setback setpoint. To meet the setpoint, the heating and cooling coils should also turn on and off. 
 
If you are using EnergyPlus/OpenStudio I can show you exactly how to do this, if you are using another program tell everyone and I am sure someone will know. 
 
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Hi Taylor, Thank you very much for your reply. Yes, I am using EnergyPlus, could you please demonstrate me what to do? Thanks.
Sean King's avatar
                        Sean King
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        8 years ago
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        Asked:  8 years ago  
 
 
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        Last updated: Aug 03 '16 
 
 
 
 
 
 
 
 
 
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