Heat ExchangersDOE-HDBK-1018/1-93TYPES OF HEAT EXCHANGERSTYPES OF HEAT EXCHANGERSIn almost any nuclear, chemical, or mechanical system, heat must be transferredfrom one place to another or from one fluid to another. Heat exchangers are usedto transfer heat from one fluid to another. A basic understanding of themechanical components of a heat exchanger is important to understanding howthey function and operate.EO 1.1STATE the two types of heat exchanger construction.EO 1.2Provided with a drawing of a heat exchanger, IDENTIFY thefollowing internal parts:a.Tubesc.Shellb.Tube sheetd.BafflesEO 1.3DESCRIBE hot and cold fluid flow in parallel flow, counterflow, and cross flow heat exchangers.EO 1.4DIFFERENTIATE between the following types of heat exchangers:a.Single-pass versus multi-pass heat exchangersb.Regenerative versus non-regenerative heat exchangersIntroductionA heat exchanger is a component that allows the transfer of heat from one fluid (liquid or gas)to another fluid. Reasons for heat transfer include the following:1.To heat a cooler fluid by means of a hotter fluid2.To reduce the temperature of a hot fluid by means of a cooler fluid3.To boil a liquid by means of a hotter fluid4.To condense a gaseous fluid by means of a cooler fluid5.To boil a liquid while condensing a hotter gaseous fluidRegardless of the function the heat exchanger fulfills, in order to transfer heat the fluids involvedmust be at different temperatures and they must come into thermal contact. Heat can flow onlyfrom the hotter to the cooler fluid.Rev. 0ME-02Page 1
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