Learn About Lewis Systems Energy Audit Today!

1. CFM of compressed air required to raise a known system pressure
   to a desired system pressure:
   
   C2 = Required CFM total

   C1 = Existing or known CFM

   P2 = Desired pressure

   P1 = Known Pressure
   
   
   
   EXAMPLE: A 75 HP Compressor rated at 320 CFM t 125 PSIG will hold only 85 PSI and we desire 125 PSI.

   C1 = 320 CFM

   P2 = 125 + 14.7 (139.7)

   P1 = 85 + 14.7 (99.7)

   C2 = 448.39 Total CFM required

   We need an additional 128.39 CFM to raise system pressure to the desired level.

   

2. Simple Energy Formula:
   
   Motor Efficiency = Cost per KW X .746 (Power Factor) X Hours of operation X Brake horse power
   
   *Note: No electric motor is 100% efficient, most will average 92-95% efficient.

3. PSI VS. BHP (Rule of thumb):
   
   For every 1 PSIG pressure drop, BHP (Brake horsepower) goes down ½ %.