Spiral Arts - Tolls for Glassblowing
 
Energy Usage Calculator

  How much does one item cost to run?  
    Energy / hr      
  How much energy does it use? Btu/hr    
         
  This is equal to:   Units Cost / unit Total cost/hr
  Electrical power Kilowatts /hr
  Propane Gallons/hr
  Natural Gas Therms
         
  How much does the hot shop cost to run?  
    Enter your equipment's energy profile
    Maximum Charging Idle Units
  Furnace Btu/hr
  Glory Hole 1 0 Btu/hr
  Glory Hole 2 0 Btu/hr
  Glory Hole 3 0 Btu/hr
  Pipe Warmer 0 Btu/hr
  Garage 0 Btu/hr
  Total Btu/hr
    Enter your energy costs    
  Energy source Cost / unit Units    
  Propane /Gallons    
  Natural Gas /Therms    
  Charge frequency /week    
  working days per week /week    
       
    Results    
    Per Hour Per Day Per Month  
  Estimated cost Propane  
  Estimated cost Natural Gas  
 
  Assumptions  
  8hr working day  
  8 hour charge cycle - charging batch  
  Per hour cost is is average hourly cost over a months time  
  Cost per day is average daily cost over a months time  
  Monthly cost is average monthly cost over a year with no down time  
 
  Some average equipment energy requirements  
 
  Max BTU's Idle BTU's  
  Glory hole with 21" fire ring and 3 doors 500,000 200,000  
  Glory hole with 18" fire ring and 2 doors 300,000 125,000  
  Glory hole with 12" fire ring and 1 door 150,000 80,000  
  1000 lb Daytank 900,000 200,000  
  250 lb Freestanding Pot Furnace 500,000 125,000  
  18" wide pipe warmer 75,000 50,000  
  Medium sized Garage 50,000 20,000  



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