Overview

Air handling units (AHUs) are at the heart of modern Heating, Ventilation, and Air Conditioning systems. They play a critical role in delivering conditioned air, maintaining indoor air quality, controlling humidity, and ensuring thermal comfort in buildings ranging from commercial offices and hospitals to laboratories, data centers, and industrial facilities. As buildings become more energy-conscious and technologically advanced, the design and operation of air handling units have evolved significantly. Today's AHUs incorporate advanced filtration systems, variable speed fans, smart sensors, energy recovery technologies, and sophisticated control strategies integrated with Building Management Systems. These innovations not only improve indoor environmental quality but also support global efforts toward sustainability and energy efficiency. The purpose of this book is to provide a clear and practical guide to the design, operation, maintenance, and sustainability considerations of air handling units. It is written for engineers, technicians, facility managers, students, and professionals involved in HVAC design, installation, and building operations. The book explains both the fundamental principles and the practical aspects of AHU systems, enabling readers to better understand how these systems function and how they can be optimized. This second edition expands upon the original work by incorporating updated information on energy-efficient technologies, smart HVAC controls, advanced filtration methods, and sustainability practices. Additional sections discuss commissioning procedures, troubleshooting techniques, and emerging trends in AHU technology, helping readers stay aligned with the evolving demands of modern building systems. Throughout this book, emphasis is placed on practical knowledge-how AHUs are selected, installed, operated, and maintained in real-world applications. Case studies and real-life examples illustrate how thoughtful engineering decisions can significantly improve system performance, energy efficiency, and occupant comfort. The HVAC industry continues to evolve rapidly as buildings move toward higher efficiency, smarter controls, and reduced environmental impact. By understanding the principles and technologies presented in this book, professionals can design and operate air handling systems that meet both current performance standards and future sustainability goals. I hope this book serves as a valuable resource for those involved in the design, operation, and improvement of HVAC systems worldwide. Charles Nehme HVAC Engineer and Author CFN-HVAC Knowledge Services https: //bit.ly/m/HVAC

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