Best of 2009
Here are the most read HPAC Engineering articles of 2009
Much has been written about controlling the minimum-outside-air quantity in variable-air-volume (VAV) air-handling systems. However, instead of debating the merits of various control methods, this article will discuss how to apply the mixed-air-plenum pressure method and why it works. ...
Preventing loss of life, property damage, and business interruptions...
Used on large industrial projects, such as nuclear power plants, and countless HVAC applications ranging from 15 to 700,000 gpm, cooling towers are everywhere....
Amid the current push to “go green” by building high-efficiency, environmentally sound, sustainable HVAC systems, heat pumps — particularly those that use the earth's geothermal energy to serve as a heat sink and source — are generating a lot of buzz. Ground-source heat-pump (GSHP) systems operate like every other HVAC system: They move energy from one place to another. Although that sounds simple, HVAC engineers and designers owe their livelihoods to the complexities. ...
The control of all-variable-flow chilled-water systems is thought to be so complicated and, thus, difficult for operators to understand that many engineers and designers resist converting their primary/secondary systems, even though the return on investment of such a conversion is measured in weeks, rather than years, with chilled-water-plant energy consumption reduced by at least 10 percent and often by 20 percent or more. ...
Like all materials, pipe experiences dimensional changes as a result of changes in temperature, expanding when heated and contracting when cooled. The key to accommodating thermal expansion and contraction in a piping system is to allow predictable and controlled piping-system movement....
Dedicated-heat-recovery-chiller and geothermal-heater/chiller technologies reduce heating, cooling, geothermal costs...
Long known to correlate with human metabolic activity, carbon-dioxide (CO2) levels are a reliable indicator of indoor pollution originating from building...
Primarily shop-assembled and shipped by rail, truck, or barge to their final destination, today's industrial-class watertube steam boilers often are called...
Recent Comments