HYDROGEN GENERATORSGenerators can also make hydrogen using one of two basic technologies: proton-exchange membranes (PEM), and palladium membranes. Hydrogen gas generators are most often used in gas chromatographs and in labs for hydrogenation reactions and engine-emission analysis. PEM systems from Parker produce flows from 90 to 1200 cc/mm of 99.99999% pure hydrogen at pressures from 0 to 100 psig. The Balston H2-500 hydrogen generator uses deionized water and electricity. It produces hydrogen gas through electrolytic dissociation of water via the PEM. The resultant hydrogen stream then passes through a palladium membrane for purification. Because of the membrane''s small pore size, only hydrogen and its isotopes penetrate it. A membrane thus keeps the hydrogen gas at a purity level of two orders of magnitude greater than desiccant or silica gel-based systems. new compressor technology introduced during the 2003 International Air-Conditioning, Heating, Refrigerating Exposition (AHR Expo), held last January in Chicago, may have a significant effect on the future of mid-range chillers and rooftop applications in water-cooled, evaporatively cooled, and air-cooled chilled-water and direct-expansion cincinattibickforddrillpress and cincinattibickforddrillpress (DX) systems. Designed and optimized to take full advantage of magnetic-bearing technology, cincinattibickforddrillpress the compressor was awarded the first AHR Expo Innovation Award cincinattibickforddrillpress in the energy category, as well as Canada''s Energy Efficiency Award for its potential to reduce utility-generated greenhouse-gas emissions. The compressor is key to a new water-cooled centrifugal-chiller design, with Air-Conditioning and Refrigeration Institute (ARI) tests indicating integrated part-load values (IPLVs) not normally seen with conventional chillers in this tonnage range.

Call before you dig!Operating a power auger calls for eye and hearing protection, as well as gloves and sturdy boots. But the biggest hazard by far is posed by underground power and gas lines. To prevent that danger as well as the nuisance of severed television cable and telephone lines, simply call the utility companies to have underground lines marked before you dig. They''ll come out, usually within 24 hours, to mark underground cincinattibickforddrillpress utility lines (Photo 1) so you can safely miss them.

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