The purpose of this chapter is to present the basic features of air-handling processes and equipment. The aim is to provide a link between the basic theories of air-han­dling processes, presented in Chapter 4, and the actual equipment covered in the Systems and Equipment book.

This chapter deals with the basic air-handling processes: filtration of particles and gaseous substances from the supply and recirculated air, air heating and cool­ing, heat-recovery processes, and humidification and dehumidification. It also de­scribes fans and ductwork.

This chapter covers the basic issues behind energy-efficient design of air-han­dling systems and equipment. It deals with equipment space requirements, associ­ated components, and the pressure losses of various components. Good design practices, including system balancing and efficient running, are also addressed.

This chapter deals with the essential factors in the selection of systems and equipment during the design stage: principles of controls, noise-reduction systems, and problems such as erosion, corrosion, maintenance and equipment cleaning, etc.

Safety issues are not covered here. These are dealt with in Systems and Equip­ment book, and some fundamental issues will be taken up in the second edition of the Fundamentals book. The following aspects should be taken into account in sys­tem design: fan safety; AHU fire protection issues; safety measures in mines, tunnels, underground car parks, etc.; transportation of chemical and explosives.

The basic topic of this chapter is theoretical aspects of air handling units, duct­work design, and the optimization of building energy systems.