The Best of Extra Edition: May 9, 2016
At www.achrnews.com, The NEWS’ Extra Edition page is home to hundreds of online-exclusive service and maintenance, technical, and business management articles. Here are some of the best.
NONCONTACT TEMPERATURE MEASUREMENTS USING IR THERMOMETERS
Infrared (IR) thermometers allow noncontact measurement of surface temperatures by analyzing the invisible, infrared spectrum emitted from an object. IR devices make it safe to take surface temperature measurements of items like rotating, hard-to-reach, electrically live, or dangerously hot targets. For preventive maintenance tasks, they cut measurement time to almost zero with the ability to take a surface temperature reading in less than 1 second.
USING EQUIPMENT LEASING TO STRATEGIC ADVANTAGE
With leasing being used by eight out of 10 businesses in the U.S. today and accounting for about one-third of new equipment acquisitions most business executives are generally familiar with leasing. But executives facing lease vs. loan decisions may not fully know how the strategic use of equipment leasing can enhance financial performance and capital productivity. A deeper understanding of the lesser-known points of leasing, including asset management, tax treatment, insurance, maintenance, and lease options, can better enable overall business performance.
MOTOR TIPS: OVERLOAD AND SPEED CHANGE
A good indication that a motor may be overloaded is overheating, or, in some cases, not starting at all. For HVAC motors, it can be as simple as belts that are too tight, inadequate wiring, or voltage that’s too low. Possible corrective actions can include: readjusting belt tension, increasing the motor size, and corrective adjustments to the power situation. How do you know the motor is overloaded? The first sign a motor is the wrong size for the application is frequent nuisance tripping of the thermal reset (also called a thermal protector).
QUICK FACTS: SUPERHEAT AND SUBCOOLING
Superheat refers to the number of degrees a vapor is above its saturation temperature (boiling point) at a particular pressure. Superheat gives an indication whether the amount of refrigerant flowing into the evaporator is appropriate for the load. Subcooling is the condition where the liquid refrigerant is colder than the minimum temperature (saturation temperature) required to keep it from boiling and, hence, change from the liquid to a gas phase. Subcooling is desirable for several reasons.
Publication date: 5/9/2016