HVAC Control in the New Millennium.pdf - HVAC.Amickracing

HVAC Control in the New MillenniumFaster ConnectionsIn the future you will be able to connect more devices to your PC,which will exchange data with them at much higher speeds. This isbecause parallel and serial ports will be replaced by high speed buseslike the Universal Serial Bus (USB) and the IEEE 1394 high-speed serialinterface (FireWire). USB provides transfers at up to 12 megabits persecond which is about 100 times faster than most standard serial ports.FireWire starts at 100 to 400-mbps and should rise to 1-gigabyte persecond in about 10 years.USB is used to connect low-bandwidth devices such as mice andscanners in many new PCs. FireWire will link external DVD and CD-ROM players, digital video, still cameras and hard drives.Wearable Electronic DisplaysA plant supervisor may soon be able to receive vital informationand see multiple areas of the plant through special safety glasses. Atechnician may be able to probe the circuit and see the output of anoscilloscope in the same view, eliminating the need to look back andforth. Wearable electronic displays can be mounted on or integrated intomost frames or safety glasses, letting users obtain and view data whilewearing normal vision aids. These new eyeglass displays use a biaxialscanning mirror to raster-scan modulated laser light onto a screen.When the light modulation and mirror motion are synchronized, animage forms. Single crystal silicon is used for the mirror.In one version the housing of the conversion electronics is separatedfrom the display by a 4-foot cable. The display has a 320- by 340-pixel resolution and a 60-Hz refresh rate. The unit has a head-supportedweight of less than 50 grams and a field of view of 12 degrees diagonal.Another version integrates the see-through or see-around displayoptics directly into the lens and includes a proprietary lens system thatrelays the image to the eye and provides prescriptive correction. Thisversion has a 10 diagonal field of view and a head-supported weight of110 grams.The demand for wearable electronics like these is expanding. Researchersat Boeing Company have designed a pair of computerizedeyeglasses that allow the wearer to interact by voice or video with a host©2001 by The Fairmont Press, Inc. All rights reserved.