Peter D. Zak, PE, Graef-USA Inc., Milwaukee
Articles
High on the energy hog
An example of a carefully planned successful energy and cost savings program was carried out by the Harley Davidson Motor Co. during the late 1990s.
Quick savings solutions
Design considerations like variable frequency drives are approaching the cost of motor starters, which allow for choices that weren't possible until now.
Economics of energy efficiency: Beyond ROI
Engineers and building owners often focus on payback periods and return on investment as economic decision-making thresholds for energy efficiency investments. However, there are other parameters that are more accurate and effective for investments in building systems.
Whatever happened to critical thinking?
New engineers are brilliant and stupid at the same time.
Control sequences for chilled water systems
The most important component of good chiller plant control is understanding the full and part load requirements and then matching those to system performance.
Airport gets a plant upgrade
Graef was commissioned in 1999 to design a new parking structure for General Mitchell International Airport in Milwaukee, but found the best location was on top of the existing chilled water and hot water power plant.
Choosing a chilled water cooling system
There are a variety of cooling systems that will meet the cooling requirements of a facility.