By John Levenhagen
Not more helpful reference for the dressmaker or specifier of HVAC regulate platforms exists than this whole "cookbook" of frequent segments and sequences. This vital expert compendium supplies a wide array of diagrams that gives every little thing you want to layout controls for an in-place or in-plan HVAC approach; deals ready-to-go info for retrofitting, updating, or designing controls for altered structures; permits transparent comparisons between advertisement keep watch over platforms; exhibits you frequently-made and valuable adjustments to controls; demonstrates tips on how to create controls for top potency, air caliber, and effort conservation; covers air dealing with, terminal, and first structures; deals sequences and segments for nearly any HVAC approach want; and indicates you the way ordinary keep an eye on algorithms paintings specifically structures. those hugely invaluable keep watch over diagrams, a lot of them akin to commercially to be had versions, allow you to layout or specify wanted configurations within the best demeanour attainable. Written via a tremendously skilled HVAC keep watch over engineer, in complete compliance with ASHRAE criteria, and masking either and software program functions, this detailed quantity fills a distinct desire. It totally merits a spot of honor inside of effortless achieve of each HVAC engineer's layout table.
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The maximum pressure is limited to about 75 psi, but the PC can be set up with many stages in series using the same driver, so it can achieve upper pressure limits well over 1000 psi. Another advantage is that the packing or seal sees suction pressure rather than discharge pressure. Disadvantages of the PC pump include the relatively higher cost of replacement parts, its large floor space requirement, the fact that the pump cannot run dry for an extended period, and upper temperature limits of about 300°F.
20 Bi-wing lobe pump. ) The wide spaces between the lobes and the slow speeds at which these pumps operate make this style of pump ideal for handling food products containing fragile solids. Shear is low with this pump. Also, the fact that the pump has timing gears means that the lobes do not actually touch each other as they rotate, a necessary condition for many sanitary food-grade applications. Disadvantages include the fact that these pumps are subject to pressure pulsations, and they have fairly high amounts of slip with low-viscosity liquids.
28 Miniature gear pump. ) These pumps are typically driven by small AC or DC motors. Brushless DC motors are rapidly becoming more popular, due to the safety associated with low voltage and reliability. These pumps are suitable for high-speed operation to keep the package size small, but life will be shorter. b. 29). They are preferred for high repeatability (<1%) and for applications where linearity with speed is important. Miniature piston pumps tend to serve these needs nicely if the process can live with flow pulsations.