the ECM was installed on September 14, the motor still operated 24/7 but with a reduced power of 21 watts. Energy and demand savings for this measure are achieved by the reduction in motor operating power. Additional savings come from refrigeration interactive effects. Because ECMs are more efficient and use less power, they introduce less heat into the refrigerated space compared to the baseline motors and result in a reduction in cooling load on the refrigeration system. Evaporator Fan Controls As demonstrated in the previous section, baseline uncontrolled evaporator fan motors usually operate continuously at constant speed. Evaporator fans controls reduce fan run time or speed depending on the call for cooling, thus saving energy and reducing demand. Figure 10 and Figure 11 show evaporator fan motor controls installed on evaporator fan boxes. Figure . Example of EF Motor Controls in Walk-In Cooler Figure . Example of EF Controller for ECM The evaluation team observed two types of evaporator fan controls: Multispeed controls change the speed of the motors in response to the call for cooling. ON/OFF controls turn the motors on and off in response to the call for cooling. Figure 12 and Figure 13 shows examples of these two control methods. Both figures show one-minute interval power data over a one-hour period. Figure 12 shows an example of a fan power when operating with multispeed controls. The operating power of a multispeed control fluctuates from high to low power at seven- to eight-minute intervals. Figure . Example of Operating Power for EF Motor with Multispeed Controls Figure 13 shows and example of ON/OFF controls. The power of an ON/OFF style control fluctuates between ON and OFF in seven- to eight-minute intervals. Figure . Example of Operating Power for EF Motor with ON/OFF Controls For the multispeed controls, energy and demand savings come from a reduction in operating and run time (multispeed motors can also turn OFF). For the ON/OFF controls, savings come from a reduction in run time. Because evaporator fan controls reduce motor operating power and/or run time,
the ECM was installed on September 14, the motor still operated 24/7 but with a reduced power of 21 watts. Energy and demand savings for this measure are achieved by the reduction in motor operating power. Additional savings come from refrigeration interactive effects. Because ECMs are more efficient and use less power, they introduce less heat into the refrigerated space compared to the baseline motors and result in a reduction in cooling load on the refrigeration system. Evaporator Fan Controls As demonstrated in the previous section, baseline uncontrolled evaporator fan motors usually operate continuously at constant speed. Evaporator fans controls reduce fan run time or speed depending on the call for cooling, thus saving energy and reducing demand. Figure 10 and Figure 11 show evaporator fan motor controls installed on evaporator fan boxes. Figure . Example of EF Motor Controls in Walk-In Cooler Figure . Example of EF Controller for ECM The evaluation team observed two types of evaporator fan controls: Multispeed controls change the speed of the motors in response to the call for cooling. ON/OFF controls turn the motors on and off in response to the call for cooling. Figure 12 and Figure 13 shows examples of these two control methods. Both figures show one-minute interval power data over a one-hour period. Figure 12 shows an example of a fan power when operating with multispeed controls. The operating power of a multispeed control fluctuates from high to low power at seven- to eight-minute intervals. Figure . Example of Operating Power for EF Motor with Multispeed Controls Figure 13 shows and example of ON/OFF controls. The power of an ON/OFF style control fluctuates between ON and OFF in seven- to eight-minute intervals. Figure . Example of Operating Power for EF Motor with ON/OFF Controls For the multispeed controls, energy and demand savings come from a reduction in operating and run time (multispeed motors can also turn OFF). For the ON/OFF controls, savings come from a reduction in run time. Because evaporator fan controls reduce motor operating power and/or run time,
NEEP%20CRL_Report_FINAL_clean.docx