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"In just 10 years, the number of chip mills in the region has more than tripled--to at least 150--each devouring an average of 10,000 acres of forest a year," says Danna Smith, executive director of the Dogwood Alliance, a consortium of environmental groups opposing chip mill operations. And with each American using up 688 pounds of paper a year (the Chinese consume just three), chip mills are not only profiting, they''re expanding.

I''d like to begin the new year with a discussion of the basics of a diesel fuel system with an in-line pump and follow up in February with the distributor type pump system. As you know, all diesel systems have a fuel tank, one fuel filter (possibly rolandnileshydraulicpowerunits more depending on the installation), a transfer pump, a high-pressure fuel-injection pump, high pressure fuel lines, low-pressure fuel lines, injector nozzles, and sometimes return (fuel overflow) lines. Figure 1 represents a typical diesel fuel system.

Servel (the gas air-conditioning company) was there with a new, higher-efficiency product. The process, which uses a gas flame to produce cooling in a continuous absorption cycle, has always been plagued by the fact that the method isn''t very energy efficient. Servel didn''t change the process but just tightened it up, resulting in a 30% efficiency increase. Gas-fired air conditioners are available in sizes from 3 tons to 25 tons. A more efficient way of getting cooling from gas is to use the gas to drive a combustion engine, which drives a compressor. And while this isn''t new technology either, it is for my friends over at Goettl, a Phoenix-based hvac/swamp cooler manufacturer that has specialized in the residential/light-commercial market. The company''s gas-driven split-package air conditioners (the compressors/motors are remotely located) are available in 15-ton and 20-ton sizes.