Direct Explicit Formulation for Approach to Wet Bulb

by John C. Sonnichsen, Jr., (M.ASCE), Sr. Engr.; Hanford Engrg. Development Lab., Richland, Wash.,
Edward C. Strozyk, Data Management Specialist; Washington State Dept. of Education,

Serial Information: Journal of the Energy Division, 1979, Vol. 105, Issue 1, Pg. 63-70

Document Type: Journal Paper


The Merkel equation is solved using numerical techniques. The input parameters are adjusted to render solutions over the normal range of operating conditions. The analytical results based upon the use of the simulation model are fitted using a least-squares regression analysis. A power series expression is developed which explicitly relates the approach to wet bulb in terms of cooling range, a dimensionless mass transfer coefficient, wet bulb temperature, and a dimensionless liquid to air flow ratio. The power expression was found to fit the calculated input data to within 5% (normally 1°F to 2°F).

Subject Headings: Temperature effects | Air flow | Parameters (statistics) | Simulation models | Least squares method | Cooling (wastewater treatment) | Mass transfer | Air temperature

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