A shell and tube heat exchanger is a class of heat exchanger designs. It is the most common type of heat exchanger in oil refineries and other large chemical processes, and is suited for higher-pressure applications. As its name implies, this type of heat exchanger consists of a shell (a large pressure vessel) with a bundle of tubes inside it. One fluid runs through the tubes, and another fluid flows over the tubes (through the shell) to transfer heat between the two fluids. The set of tubes is called a tube bundle, and may be composed by several types of tubes: plain, longitudinally finned, etc.
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—Henry David Thoreau (1817–1862)
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—Robert Benchley (1889–1945)
“And suddenly, to be dying
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Only wearying, the heat unbearable ...”
—John Ashbery (b. 1927)
“I want to know whether you are a person devoted to creating or to exchanging in some respect or other: as a creator you belong to the free, as an exchanger you are their slave and instrument.”
—Friedrich Nietzsche (1844–1900)