Converting constant-volume package rooftop units to variable-volume operations can have a significant impact on energy consumption. Since their creation, package rooftop units (RTUs) have been ...

Speed, torque, and horsepower are three inter-related parameters in motor control. The speed of a motor, measured in revolutions per minute (rpm), defines a motor's ability to spin at a rate per unit ...

Fixed expenses are easier to plan around because they stay the same from one month to the next. Variable expenses, on the other hand, are less predictable. Understanding both types and how they impact ...