If there are trends in transport refrigeration, they concern quietness and precision. Noise reduction comes in because trucks often bring products to supermarkets conveniently located in residential areas — but with deliveries needed first thing in the morning. Enhanced temperature control is designed to preserve products at optimum shipping temperatures while controlling costs. Thermo King focused on such factors in the development of its SB-100 trailer refrigeration unit.
One of the key features of the latest Food Code is a recommendation that each food establishment have an effective Hazard Analysis and Critical Control Point (HACCP) plan tailored to its own operations. The HACCP plan identifies hazards that might contribute to food-borne illnesses, and establishes critical points in the food-handling process where controls can help ensure the safety of food. Refrigerated storage is one such critical point.
The U.S. Department of Energy (DOE) has announced the release of six books that complete its Energy Design Guidelines for High Performance Schools, a series of publications developed to help school districts save millions of dollars on annual utility bills by designing energy-efficient schools specifically for their regional climates.
The importance of running a load calculation is not a new concept — but the load calculations are. And even the calculations are not entirely new. They are based on older load calculation methods, which we can now compute much more quickly than when they were first devised. Lynn Bellenger, P.E. (Pathfinder Engineers, Pittsford, NY), opened the ASHRAE seminar “Review of Load Calculations Procedure” with an overview: “How Did We Get Here.” It is probably the best way to understand and appreciate current load calculation methods.
If an ultrasonic leak detector works in outer space in the hands of an astronaut, can it do the job on the ground when operated by an HVACR service technician? Yes, said a Westminster, MD-based manufacturer whose small, handheld leak detector has been used in both applications.
Single- and three-phase alternating current (AC) motor speed can be controlled by controlling the frequency of the voltage coming to it. Motor speed has a lot to do with the capacity of refrigeration compressors in refrigeration applications today. This article covers a device the industry is using for three-phase motor speed and capacity control called a variable-frequency drive (VFD).
Just as successful supermarkets give customers what they want, suppliers of components for mechanical refrigeration for such stores are offering most anything a decision maker could possibly want. The recent Food Marketing Institute Educational Exposition stressed a wide range of options for cooling and freezing. All were linked by a commitment to energy conservation, from a basic coil to complex electrical distribution systems.
New directions in transport refrigeration involve cryogenics and carbon dioxide (CO2). Thermo King, in Minneapolis, MN, is using cryogenics technology to create what the company said is cleaner, quieter, and more efficient temperature control. The cryogenics transport refrigeration systems use liquid CO2, eliminating the need for ozone-depleting commercial refrigerants.
Troubleshooting single-phase refrigeration compressors requires a technician to have a proficient understanding of capacitors. The start capacitor is one of two types of capacitors that can be found on single-phase compressors. Understanding how to troubleshoot and replace a defective starting capacitor is essential when working with these compressors.
People leaving the military want to find quality jobs. The construction industry, including those in the HVACR field, has long been seeking more quality workers. The new “Helmets to Hardhats” program intends to bring them together for the benefit of all.