Estimating Electric Motor Operating Cost Per Year

-
Estimating Electric Motor Operating Cost Per Year

When determining the operating cost of a project, it is important to remember motor operating costs.
To determine these costs by using the following formula:
EMOC/YR = (HP) (%FL) (0.746 HP KW) ($/KWH) (HRS/YR)/MOTOR EFFICIENCY
Where
·                     Estimated Motor Operating Cost per Year = EMOC/YR
·                     Motor Horsepower = HP
·                     Motor Percentage of Full Load = %FL
·                     Horsepower to KW factor = 0.746
·                     Dollar per Kilowatt Hour = $/KWH
·                     Motor Operating Hours per Year = HRS/YR

Example
For an example use the following variables to determine an estimated motor annual operating cost:
·                     Motor Horsepower = 200
·                     Motor Percentage of Full Load = %FL (you will need to estimate this value)
·                     Dollar per Kilowatt Hour = $0.07 (you will need to determine your rate)
·                     Motor Operating per Year = 8,232 HRS/YR (49 WEEKS x 7 DAYS/WK x 24 HRS/DAY)
·                     Motor Efficiency = 96.2%

Therefore
·         EMOC/YR = (200 HP) (0.85 FL) (0.746 HP KW) ($0.07/KWH) (8,232 HRS/YR) / 0.962
·         EMOC/YR = $75,965/YR, say $76,000/YR FOR A 200 HP MOTOR
·         As reference, for efficiency ratings you can use the following table for NEMA 3-Phase premium TEFC motors operating at 1800 RPM:



AT ATMOS360 WE BELIEVE HEALTHY, SAFE BUSINESS ENVIRONMENTS IMPROVE BUSINESS RESULTS

For this and more
Contact Us Today @ http://www.atmos360.com/
#ATMOS360 #ATMOSsafe

Comments

Post a Comment

Popular posts from this blog

Why you don't need explosion protection on drum filters

-
Image
Why you don't need explosion protection on drum filters We at  ATMOS360   are in the business of engineering and manufacturing dust collection systems and equipment. As we develop the scope for new systems, as well as upgrades to existing systems, we must evaluate the options for the use of a baghouse filter versus a drum filter. The Need for Explosion Protection One important factor is the need for explosion protection. The cost of an explosion protection system can add as much as $100,000 to the cost of filtration equipment. The need to provide explosion protection on a baghouse filter is typically straightforward and, in most cases, is needed. Drum filters, however, are a different animal and for some installations, explosion protection is not required. Typically drum filters have rounded floors and inlet ductwork designed to provide a low sweeping inlet. This keeps the floor clean and minimizes the amount of material within the dirty air plenum. Based on a
Read more

Troubleshooting Fan Speeds

-
Image
Troubleshooting Fan Speeds Let’s say you are out in the field doing some troubleshooting on an air system fan, or any other type of motor-driven sheave (pulley) system, and you need to determine fan revolutions per minute or RPMs.   The easiest way is to measure the RPM with your tachometer.  You reach into your tool bag only to remember that you let a team member borrow it and they have not yet returned it.  Not to worry because you always have a backup-plan – math! You can use the following formula to determine the fan RPM: Find These Variables ·                      Record the motor RPM from the motor tag ·                      Measure the motor (driver) sheave diameter in inches ·                      Measure the fan (driven) sheave diameter in inches Example Problem Motor RPM from the motor tag - 1750 RPM Motor (driver) sheave diameter – 10.0” Pitch Diameter (P.D.) Fan (driven) sheave diameter – 14.0” P.D Remember, if you k
Read more

5 Reasons Why You Need a Dust Control System

-
Image
5 Reasons Why You Need a Dust Control System Within manufacturing processes, there are times when production equipment generates dust that can prove difficult to eliminate. Because of this, the manufacturing industry must apply dust control methods to these dust generating processes. The top five reasons for implementing dust control methods into your processes 1. Improve the quality of the product ·                      Reduce or eliminate unwanted dust on the product 2. Reduce employee exposure ·                      Improve employee health by reducing the dust concentration in milligrams per cubic meter (mg/m3) 3. Reduce equipment process safety risks ·                      Dust build-up on equipment could become a fire hazard ·                      Dust build-up on surrounding equipment/building area increases a secondary explosion risk 4. General housekeeping ·                      Commonly, process dust migrates from the line and co
Read more