Fog and drift deposition from evaporative cooling towers

Technical Report · Mon Sep 01 04:00:00 EDT 1975

OSTI ID:4159363

Hanna, S R

Methods of determining fog and drift deposition due to emissions from evaporative cooling towers are reviewed and formulas suggested that can be used as a basis for calculations. The Gaussian plume formula is recommended for calculating fog concentrations from which visibility can be estimated. For drift droplets with diameters greater than 200 $mu$m, deposition is calculated by ballistics methods, knowing the environmental wind speed and relative humidity and the vertical velocity of the plume and the droplet. Evaporation of the droplets is accounted for. Drift droplets with diameters less than 200 $mu$m are assumed to be dispersed according to the Gaussian plume formula, with the plume tilted downward to account for the settling speed of the droplet. (auth)

• Research Organization: National Oceanic and Atmospheric Administration, Oak Ridge, Tenn. (USA). Atmospheric Turbulence and Diffusion Lab.
• NSA Number: NSA-33-007342
• OSTI ID: 4159363
• Report Number(s): ATDL--75/17
• Country of Publication: United States
• Language: English

Related Subjects

*COOLING TOWERS-- THERMAL EFFLUENTS
500400* --Environmental Sciences
Atmospheric--Thermal Effluents Monitoring & Transport
ATMOSPHERIC PRECIPITATIONS
DESIGN
DIFFUSION
DROPLETS
MATHEMATICAL MODELS
METEOROLOGY
N44610* --Environmental & Earth Sciences--Thermal Effluents-- Atmosphere
PARTICLE SIZE
VELOCITY
WASTE HEAT
WIND