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Energy use drops but energy bill same
 
  
 
  
 
 
 
 
 
 
    
        
        asked Mar 19  
 
 Sfrepp's avatar  
 
 
 
 
    
        
        updated Mar 19  
 
 Aaron Boranian's avatar  
 
 
 
 
 
Working on a simple study model, with BSLN and PROP cases.
 
     
  1. DistrictCooling:Facility is lower in PROP.
    2.  
  2. Zone Air System Sensible Cooling Energy is lower in PROP.
    3.  
  3. Yet, Electricity:Facility is still the same in both cases. Why?
    4.  
 
I am unable to find why lowered cooling does not affect energy cost. I am not a seasoned EnergyPlus user. Any help is deeply appreciated.
 
All EnergyPlus files and results are saved here.
 
Thank you!
 
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        answered Mar 20  
 
 shorowit's avatar  
 
 
 
 
 
You are using ZoneHVAC:IdealLoadsAirSystem objects, which are idealized HVAC systems w/ COP of 1. They do not represent realistic equipment and are accounted for in EnergyPlus as district systems (i.e., outside the building facility) that perfectly meet the thermal load. Even if you somehow accounted for the district system use in your energy costs, it would not be a meaningful result.
 
The only way to get meaningful energy cost impacts is to model a real HVAC system with an efficiency and fuel type.
 
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        Asked:  Mar 19  
 
 
        Seen: 54 times 
 

        Last updated: Mar 19 
 
 
 
 
 
 
 
 
 
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