Gas Emission Control - Mathematics and Statistics for the Environment - page 487

( ) −− ( )

212 − 120 160 60

T lm = = 96°F

212 −

−

120

ln

160 60

For cooling water with a water coolant, U is assumed to be 200 Btu/°F⋅ft 2 ⋅hr.

q
UT lm

34 320 , tu/min

2 2

A = = = 179 . ft ,or2ft

2

( 200 tu/°Ffthr)( ⋅ ⋅ 96 ° F)

The total area needed is

A = 3272 + 2 = 3274 ft 2

As illustrated by this example, the area for subcooling is very small compared to the area required
for condensing.

REFERENCES AND RECOMMENDED READING
AIHA. (1968). Air Pollution Manual: Control Equipment, Part II . American Industrial Hygiene Association,
Detroit, MI.
Buonicore, A.J. and Davis, W.T., Eds. (1992) Air Pollution Engineering Manual . Van Nostrand Reinhold, New
York.
Davis, M.L. and Cornwell, D.A. (1991). Introduction to Environmental Engineering . McGraw-Hill, New York.
Hesketh, H.E. (1991). Air Pollution Control: Traditional and Hazardous Pollutants . Technomic, Lancaster, PA.
Spellman, F.R. (1999). The Science of Air. CRC Press, Boca Raton, FL.
Spellman, F.R. (2008). The Science of Air: Concepts and Applications , 2nd ed. CRC Press, Boca Raton, FL.
USEPA. (1971). Control Techniques for Gases and Particulates . U.S. Environmental Protection Agency,
Washington, DC.
USEPA. (1972). Wet Scrubber System Study , NTIS Report PB-213016. U.S. Environmental Protection Agency,
Research Triangle Park, NC.
USEPA. (1973). Air Pollution Engineering Manual , 2nd ed. U.S. Environmental Protection Agency, Research
Triangle Park, NC.
USEPA. (1981). APTI Course 415: Control of Gaseous Emissions , EPA 450/2-81-005. U.S. Environmental
Protection Agency Air Pollution Training Institute, Research Triangle Park, NC.
USEPA. (1984). Wet Scrubber Plan Review: Self-Instructional Guidebook , EPA 450/2-82-020. U.S.
Environmental Protection Agency Air Pollution Training Institute, Research Triangle Park, NC.