77-09: The Sound of Low-Speed Fans OzoneA general view of reported studies and prediction techniques for cooling tower noise is given. Fan noise generation is discussed with respect to the control of low to mid frequency noise from mechanical draft cooling towers. An exploratory aerodynamic analysis of fan noise generation is provided leading to empirical relationships for trailing edge turbulent boundary layer noise, a major noise source in propeller fans. Aeroacoustics means for reducing
A review of the incidence in Douglas fir "treated" lumber
we have studied the effectiveness of bromine-based biocides for control of biofilm bacteria in general and for control of problem organisms like Legionella pheumophila and SRBs in particular
system operation and other variables is discussed
Typical municipalities have hundreds of miles of pipelines and focus on the inspection of this underground infrastructure has historically been a regular practice of the maintenance of this system
this document summarizes the potential of the novel thermodynamic cycle
Low levels of zinc are used to reduce the dependency on alkalinity and calcium carbonate super saturation for corrosion control
designed with maintenance-prone construction/expansion joints and subject to long-term material shrinkage cracking
Magnesium (~ 150 mg/l)
water treatment suppliers have not proactively disclosed the ingredients in their cooling water chemical products
The cooling tower industry has long sought without success to find the ideal fill
thermal pollution problems can be minimized
their structural integrity may be compromised when subjected to lateral loads due to hurricanes and earthquakes
