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Heat Exchanger Engineering Techniques

Michael J. Nee
Michael J. Nee
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ASME Press
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Before beginning the subject of air coolers it is a good idea to ask, Why should air be used for cooling rather than water? This chapter touches on a variety of subjects that might influence the answer. For a comparison of air and water as cooling fluids, see Table 4-1, “Air versus Water Cooling.”

Air can be used to either heat or cool fluids and is available everywhere. There are more cooling than heating applications. Air is a poor conductor. To offset this it is beneficial to add surface to the outside of tubes that contain fluids to be heated or cooled. This improves heat transfer efficiency in terms of cost and size. Outside to inside surface ratios of 15 or 20 to 1 are common. Typical constructions include:

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