Always evaluate the consumer’s current usage of the PSC motor (with or without continuous fan) compared to the desired usage of the retrofit ECM. Be careful how you quote energy savings. Static energy savings charts are typically based on PSC motors that are operated continuously. If the PSC motor is not operating continuously, the energy savings will be lower; however, consumers will gain all the benefits of the continuous fan with the ECM without increasing their current energy usage.
metric tons of
to quote energy savings. However, it should be noted that actual savings may differ based on:
of electricity used in a commercial building.
The energy savings in kilowatt-hours (kWh)
Projected global electric motor market value by 2022
Compliance to rule is required.
constant-airflow electronically commutated motor
During heating and cooling demands, a high-efficiency
The DOE issues a final rule for energy conservation standards for commercial and industrial electric motors 200-500 hp.
regional hours of operation in heating and cooling modes and cost per kWh
can save up to 75 percent on annual motor operating costs due to its ability to operate at speeds slower than the operating range of a comparable PSC motor.
motors are hard at work blowing air,
However, PSC motors still make up approximately 50 percent of new units built in this market.
Until recently, indoor blower ECMs were only built for use in new, original equipment manufacturer (OEM) units. In 2007, the first retrofit indoor blower ECM was introduced. Designed specifically to replace PSC motors, these constant-torque retrofit ECMs provided a unique opportunity for contractors and consumers.
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not have to wait to get these benefits.
Simply moving the
air accounts for
According to the 2012 U.S. Energy
Prior to the introduction of the retrofit indoor blower ECM, a consumer would have to replace the entire HVAC unit to get the benefits of ECM technology.
This meant consumers with young PSC motor-driven equipment would typically wait until the end of a unit’s life to get the benefits they wanted from ECMs. With retrofit capability, however,
Effective date of rule.
provide savings charts or calculators to quote energy savings.
The DOE’s estimate of the industry’s net present value (INPV) for manufacturers of electric motors.
EFFICIENFY RATING OF A 25-HP MOTOR, BY YEAR
split capacitor induction motor
Indoor blower ECMs were introduced
Ranking based on their electrical efficiencies and ability to support and/or improve system performance, IAQ, and comfort.
JULY 28, 2014
can save approximately 25 percent on annual motor operating costs compared to a PSC motor.
2012 U.S. Energy Administration’s Commercial Buildings Energy Consumption Survey stated about one-half of commercial buildings in the U.S. were constructed before
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The market is expected to increase at a compound annual growth rate (CAGR) of
Most retrofit ECM manufacturers
Cooling and heating equipment represents about
consumers with young equipment do
The cumulative reduction in CO emissions through 2030.
produced for use in new equipment (furnace, air handler, package) in the direct-drive residential and light commercial HVAC indoor blower motor marketplace:
Assuming an electricity rate of $0.12/kWh, and 8,000 hours per year at 75% load, that is an annual electricity savings of about
motor run time
In addition, the cost of the retrofit is usually about the same as the cost difference between comparable new equipment built with an ECM or PSC motor.
JUNE 1, 2016
from 2015 to 2022.
The DOE’s estimate of manufacturer loss of INPV at today’s standards
constant-torque electronically commutated motor
During continuous fan demand, an
Administration’s Annual Energy Outlook:
Estimated energy savings would result in cumulative greenhouse gas emission reductions of approximately:
The overall global electric motor market value in 2014
circulating water, cooling compressors,
And, while there are still a significant number of single-speed motors in operation, many OEMs are making a concerted move toward variable-speed equipment in order to meet a growing demand for higher efficiency. To help OEMs meet their goals, and to meet increasingly stringent motor efficiency regulations from the U.S. Department of Energy (DOE), motor manufacturers have introduced their smartest, most efficient products yet. For many decades, the single-speed permanent split capacitor (PSC) motor was the industry standard. However, as consumers have demanded higher efficiency, manufacturers have developed new variable-speed motors to help meet those expectations.
almost 30 years ago
of the total energy consumed.
With retrofit capability, however,