
Control Systems for Heating, Ventilating and Air Conditioning, Sixth Edition contains a comprehensive treatment of heating and air conditioning system controls. This book was originally written to provide fundamentals of HVAC control to practitioners who were designing new control systems or maintaining existing control systems. Emphasis on fundamental control system principles along with the psychrometrics of air conditioning processes has remained a focus of the new edition. While control system technology has changed drastically over the years, the fundamentals of controlling heating and air conditioning systems have changed only modestly.
Readers will find that fundamentals of existing control systems remain in this book so that those who need to maintain or troubleshoot systems that are twenty or thirty years old will be able to see what practitioners did during that time frame. In addition the ubiquitous application of digital control technology in very recent times is also described. Note that the fundamental control principles once implemented pneumatically are now being implemented in modern digital computers - software now replaces hardware. Another change since the last addition is a new emphasis on controlling minimum fresh air for validation purposes. New techniques for doing this have been developed in response to ASHRAE Standard 62, "Ventilation for Acceptable Indoor Air Quality," and these methods are included.
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