Designers of air conditioning and refrigeration equipment have fresh guidelines for noise limits. The Air-Conditioning and Refrigeration Institute (ARI), based in Arlington, VA, publishes the new performance standard, ARI Standard 260-2001. Its title is "Sound Rating of Ducted Air Moving and Conditioning Equipment." That standard, along with 20 others, is available for free download on ARI's website, www.ari.org. Standard 260-2001 establishes a method of rating sound in indoor portions of ducted air moving and conditioning equipment. It provides definitions and requirements for acquiring mapped sound data. Sound power level calculations and ratings also are included, as are minimum data needs for published sound ratings and conformance conditions. ARI standards set rating criteria and procedures for measuring and certifying product performance. The ratings help buyers choose the proper equipment for specific applications.
MIT students modified a 3D printer to enable it to print more than one object and print on top of existing printed objects. All of this was made possible by modifying a Solidoodle with a height measuring laser.
This Gadget Freak Review looks at a keyless Bluetooth padlock that works with your smartphone, along with a system that tracks your sleep behavior and wakes you at the perfect time in your sleep cycle to avoid morning grogginess.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.