Lecture Heat Transfer - Chapter 7: Boiler & Condenser

Shell-and-tube heat exchangers are foundational components in numerous industrial applications, playing a critical role in efficient thermal energy management. Their robust design and versatility make them indispensable for transferring heat between two fluids, ensuring optimal process conditions across diverse sectors like chemical processing, power generation, and refrigeration. This document outlines the essential technical requirements and fundamental design considerations pertinent to these exchangers, providing a comprehensive overview of their operational principles and importance in maintaining energy efficiency and system integrity. Understanding these aspects is crucial for effective implementation and optimization of heat transfer processes.

Students and professionals in chemical, mechanical, and process engineering, particularly those involved in thermal system design, operation, and optimization.

This document provides a detailed exploration of shell-and-tube heat exchangers, covering their fundamental principles, design specifications, and operational characteristics. It begins by outlining critical technical requirements such as the overall heat transfer coefficient, pressure drop, and heat transfer area, alongside considerations for structural integrity and leakage under various operating temperatures and pressures. Comprehensive criteria for fluid selection are presented, emphasizing properties like density, heat capacity, thermal conductivity, viscosity, and suitability to prevent issues like flammability or corrosion. The text further illustrates various fluid arrangements and provides guidelines for appropriate fluid velocity to optimize performance. A significant portion is dedicated to the diverse configurations of shell-and-tube heat exchangers, including double pipe, fixed head, floating head, and U-tube designs, highlighting their specific advantages like large surface area, high-pressure capability, material versatility, and ease of cleaning. Furthermore, the document delves into the thermal performance analysis by detailing temperature-driving forces. It explains how to compute the rate of heat transfer, incorporating the Log Mean Temperature Difference (LMTD) and the application of correction factors (FT) for multiple-pass configurations, supported by relevant equations and a practical example. This holistic approach is vital for informed heat exchanger design and process optimization in industrial settings.