Economic Considerations in Heat Exchanger Selection

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Heat Exchanger Designs & Selections • Differential Thermal Expansion • Pass Arrangements for Flow Through Tubes
Shell Side Fluid Flow • Impingement Plates (based on application) • Maintenance and Servicing Considerations
Principal Components • Heat Exchanger Tubes • Materials of Construction • Economic Considerations in Heat Exchanger Selection
Heat Exchanger Rating versus Expected Loads • Fundamental Heat Transfer • Load is the Measure of Heat Transferred
A Combination of Three Factors Governs Load Capacity • Heat Transfer Coefficient (U) Depends on Many Variables
Area is the Total Effective Tube Area

Economic Considerations in Heat Exchanger Selection

At the flow diagram stage there are usually many variables, such as temperatures, pressures, flow rates and the like, which can be changed within limits. Later on, these factors become set as fixed quantities. It is well to recognize during the design of the system that they do have an influence on the size and cost of heat exchange equipment.

•Temperatures of heating and cooling media
A higher heating media temperature results in a smaller heat exchanger for a given heating load. Limitations of materials must be kept in mind here.

•Pressure drops permitted by the system affect heat exchanger size
The highest allowable pressure drop will result in substantial savings in heat exchanger size.

•Length restriction sometimes affect heat exchanger costs
However, there are so many exceptions and limiting conditions that we cannot simply say ‘‘the longer the cheaper."

•Materials of construction
Corrosive tendencies and purity requirements of fluids being handled. Often, the choice here is based on reliable data and experience.

CMS Heat Transfer Division, Inc.

273 Knickerbocker Avenue ï¿½ Bohemia, NY 11716 USA

Tel: 631-968-0084 ï¿½ Fax: 631-968-0184 ï¿½ Email: info@cmsheattransfer.com

CMS Heat Transfer products include shell and tube heat exchangers, fixed tubesheet and u-tube exchangers, oil coolers, pre-heaters, condensers, after-coolers, steam converters, kettles, reboilers and evaporators. CMS engineering include custom heat exchanger, process and mechanical design services to all TEMA and ASME conformance requirements.

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