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Comment Heat Transfer

Heat Transfer: System Design II

By Chemical Engineering |

Click here for full pdf version of this article – includes all graphs, charts, tables, and author information EXPANSION TANK A well designed expansion tank: 1. Maintains a static pump-suction head 2. Compensates for temperature-related volume and pressure changes 3. Provides a means of venting moisture and low boilers 4. Prevents fluid oxidation Usually, the expansion tank is installed at the highest point in the system and is connected to the suction side of the pumps. It should serve as the main venting point of the system, as well as provide for system fluid expansion, which can be 25% or more depending on fluid choice and on the operating temperature range. For heating circuits, the expansion tank should be sized so that it is one-quarter full at ambient temperature and three-quarters full when the system is at operating temperature. For cooling, it should be vice versa. The double drop-leg expansion tank provides greater flexibility of operation than a single leg tank. From a single-leg expansion tank, venting of noncondensibles is often difficult in heating systems as is purging of air and water on startup. A double-leg expansion tank provides uninterrupted flow on startup and significantly improves the venting capability…
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