If a motor such as a compressor motor does not state the motor horsepower, then this formula will also work to determine the rated or actual operating horsepower. Efficiency usually is expressed as brake horsepower per 100 cfm of delivered air. This is normal on a motor that is off and ready to start. I want to hear from you. This number multiplied times the rated horsepower gives the actual horsepower the motor could operate at in an emergency. The power efficiency of a compressor is the ratio of the air delivered by the compressor and its input electrical requirements. If a blower motor, for example, is going to get a drive pulley change, this formula will give the motor's actual operating horsepower prior to the change so the technician can tell if the motor has enough horsepower capacity available or if the motor must be changed. C1 = 320 CFM. If the efficiency is not given, it can still be determined using basic math. The total brake horsepower required is equal to the sum of the required horsepower for each stage. This use of the service factor is not recommended, as it is not completely reliable since it assumes the voltage the motor is getting is exactly correct. Fundamental to these useful calculations is some understanding of the information contained on a motor data plate. View Newsletter Archives », © 2009-2020 Lewis Systems and Service Company. Copyright ©2020. This amperage is the current the motor will draw when the motor is loaded up to its rated horsepower. Visit our updated, This website requires certain cookies to work and uses other cookies to help you have the best experience. All Sponsored Content is supplied by the advertising company. Design, CMS, Hosting & Web Development :: ePublishing, American Standard Heating & Air Conditioning. The three-phase motor is 73 percent more powerful than an equivalent motor using single-phase. If the motor must be changed, this calculation also gives added information to help determine what new size motor will be necessary when the pulley is changed. Quick Chart (Numbers based on per MMSCFD) When discussing IAQ with your customers, these three pointers will be helpful in guiding your conversations as you explain what it means to achieve ‘clean air’ through the right systems and solutions. The service factor can also be multiplied times the FLA of the motor to give the absolute highest operating amperage the motor should be allowed to operate with. The amperage is less than full load so the motor is not working at the 5 hp it is rated for. The gas power is directly proportional to head and mass flow and inversely proportional to efficiency. Use this formula just like the single-phase version. We can help you to manage or discuss with your Karmic Debtors! A common service factor on motors is a SF of 1.15. This is what gives the three-phase motor its superior starting and running power and eliminates the need for start capacitors and start relays to remove a starting winding as is often necessary with single-phase motors. Locked Rotor Amps (LRA) The purpose of making adjustments in the first place is to increase efficiency and provide for increased comfort at lowered operating costs as well as to avoid causing expensive system failures.

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