Heat Exchangers

General Objectives:

To enable the participants to understand technology, performance and operation of heat exchangers.

Specific Objectives:

At the end of training the trainees will be able:

• To have a better knowledge os shell and tube heat exchangers types;
• To know the heat exchange principles applied to heat exchangers;
• To be aware of how operating conditions impact on heat exchanger performance;
• To be able to estimate fouling resistance values and to ptimize the heat exchanger cleaning interval;
• To manage routine operation safety and know the main steps of start-up, cleaning and testing.

CONTEÚDOS

CONTENTS:

Module I – TEMA standard shell and tube heat exchangers

• TEMA standard heat exchanger nomenclature. Types of shells, front and rear head ends;
• Fluid circulation and bypass flows;
• Application: study of different heat exchanger types.

Module II – Heat Exchanger Performance

• Heat exchange conditions: convection coefficients, resistance caused by tubes and fouling;
• Overall transfer coefficient;
• Mean thermal potential in a heat exchanger, number of transfer unit efficiency;
• Heat flow rate exchanged: influence of circulation mode and fouling;
• Application;
• Convection coefficient calculation;
• Overall heat transfer coefficient estimate and mean thermal potential calculation.

Module III – Operation and monitoring

• Routine operation: influence of operating conditions (inlet temperature – fluid flow rate …) on heat exchanger performance;
• Heat transfer coefficient calculation and monitoring: impact on heat exchanger performance and energy consumption. Performance prediction;
• Troubleshooting: overall heat transfer coefficient comparison between clean and dirty conditions. Fouling resistance calculation.

Module IV – Start-up – Test and cleaning procedure

• Optimum cleaning interval estimate, preparation, safe procedure;
• Inspection of exchanger bundles, extended plate type and air coolers;
• Hydraulic water pressure test: case of U tube bundle and floating head heat exchangers;
• Application;
• Thermal performance prediction;
• Determination of optimum cleaning frequency;
• Study of safe start-up, test and cleaning procedure.