The Properties and Purposes of Heat Exchangers

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Information about The Properties and Purposes of Heat Exchangers
Business & Mgmt

Published on February 18, 2014

Author: michelebowie

Source: slideshare.net

Description

Learn about the Properties and Purposes of heat exchangers with this informative guide. It discusses industries who rely on heat exchangers, exchanger fouling, and much more.

There are a few industries out there which benefit from certain parts of an HVAC system. Take heat exchangers, for example. Many industries out there rely on the use of heat exchangers. They are used in space heating, refrigeration, air conditioning, power plants, chemical plants, petrochemical plants, petroleum refineries, natural gas processing, and sewage treatment. Chemical process plants rely heavily on the use of heat exchangers. In fact, it is relatively rare to see a chemical processing plant without a heat exchanger. The effectiveness of a heat exchanger is critical and can even determine the overall energy efficiency of the plant in certain cases.

The effectiveness of a heat exchanger installed in a process plant is determined by three different parameters: 1. The area available for heat transfer. 2. The overall heat transfer coefficient. 3. The difference in temperature between both the hot and cold fluids.

Exchanger fouling is a common problem which can quietly rob the efficiency of a heat exchanger. Fouling reduces heat exchanger effectiveness and can lead to more valuable process streams to be put into less valuable byproduct streams. One example of this occurring is when petroleum refineries suffer when marketable propane and butane are dumped into nonsaleable fuel gas streams due to less efficient heat exchanger systems.

There are various types of heat exchangers as well. Heat exchangers are also part of something called a waste heat recovery unit, or a WHRU unit. This is a heat exchanger that recovers heat from a hot gas stream while transferring it to a working medium, typically water or oils. Dynamic scraped surface heat exchangers are used for heating or cooling with high-viscosity products, crystallization processes, evaporation and high-fouling applications.

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