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Controlling the Integrated Water-Recovery SystemIn this section, we describe the control tasks for the final IWRS system that went into test in 2001, first by subsystem and then for the IWRS as a whole (figure 8).The Biological Water ProcessorFeed water from the waste-water collection system (figure 3) first passes through the BWP. The main control task for the BWP is to keep the water in the gas-liquid-separator (GLS) (see the lozenge icon with the three-level switches in the upper left of figure 8) at mid-level, which is accomplished by varying the speed of the feed pump, and the draw from the reverse-osmosis main pump remains constant. The other requirement is to monitor the pressures in the recycle loop, as well as in the nitrifier tubes, and carry out automatic shutdown procedures in the case of off-nominal values. For example, if one of the nitrifier tubes shows too high a pressure, the water and air pumps associated with this tube are shut down, and a warning is issued. Any new hand tools? I didn''t find much, except for Malco''s new MAX 2000 aviation snips. This is mostly a redesign of its line of snips to beef them up and to make them more comfortable to use. The most noticeable change is a plastic handle covering for less fatigue in prolonged-use conditions. They also boast a full 1 1/4-in. cut and everyday 18-gauge capacity.Equipment portablecarheater and systemsSince there were few hvac equipment manufacturers at the show, there is little to tell on that front. Some odds and ends, however, are worth noting. The DE 10 basic pump model uses a fixed cam, spill-pump-spill fuel and timing control that was originally targeted for constant speed portablecarheater applications. As the variety of customer engine configurations has expanded, Stanadyne has recognized that the DE 10 was the simplest alternative for variable speed applications, as well. The DE 10 is designed for economical electronic full authority fuel and timing control, with injection pressures to 14,500 psi.Typical performance features managed by an electronic control module include cold-start timing advance, excess cranking fuel, fuel curve shaping for turbo boost compensation, temperature compensation, portablecarheater and transient fuel and timing control. All governing options are electronically controlled, as well. The spill valve closure signal provides closed-loop timing feedback without an additional timing sensor. ©2003 www.autoheaters.net All rights reserved. |
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