Heat Exchanger Rating versus Expected Loads

Download Acrobat (PDF) Specification Sheet CMS_Design_Selection.pdf (601kb)

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

Heat Exchanger Rating Versus Expected Loads

A well designed shell and tube heat exchanger will handle its rated load under the conditions for which it was specified.

Emergencies occur in some processes, and it may be advantageous to have some extra margin of heat exchanger capacity to take care of them. The cost of such a safety factor can be modest compared to the protection it will afford to valuable material in process or to other expensive equipment in the system.

Fouling affects capacity, and this factor sometimes accounts for a certain amount of confusion when ratings are compared.

There is no economy in assuming an optimistically low fouling factor even if it seems to make a smaller heat exchanger feasible. Later on, difficulties with reduced capacity; low process yields frequent shutdown for cleaning and extra maintenance can dissipate this saving very quickly.

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.

IMPORTANT DISCLAIMER: All information on this site is provided for reference. While we make effort to provide accurate information, CMS cannot be held responsible for errors either of omission or typographical.

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