Multiple-zone HVAC: An Obsolete Template

Abstract

ABSTRACT Multiple-zone central air handling systems are presently the dominant type of HVAC for large buildings. Despite that, they are obsolete. They are inherently incapable of providing a high level of comfort and good ventilation while operating with good energy efficiency. In addition, such systems make buildings vulnerable to infectious diseases, fire, and terrorism. These shortcomings are inherent; they are not merely practical problems that await clever solutions. The desirable alternative is single-zone systems. These can completely avoid or greatly reduce the problems of multiple-zone systems. Furthermore, the economics of single-zone systems are favorable in comparison with central systems. In order for the full potential of single-zone systems to be achieved, a new doctrine of HVAC design, called “optimized-function HVAC,” was presented internationally in 2005, with greater detail being added in later presentations. This doctrine is freely available, and the sources are given at the end of this article. Responsible HVAC designers will take the initiative to learn this optimized doctrine of HVAC design and bring it into practice as quickly as possible.