LETTERS

ABSTRACT

Robert Guery, Life MemberASHRAE, Ebmatingen, Switzerland * From July's "Confessions of a Control Freak," by Andy Pearson, Ph.D., C.Eng., Fellow ASHRAE, regarding cooling systems with multiple capacity stages that "hunt," in addition to increasing the stage delay time, one should also consider the cooling demand side. MemberASHRAE, Brisbane, Australia Airborne Disease Transmission Risk We read "Airborne Disease Transmission Risk and Energy Impact of HVAC Mitigation Strategies" by Michael J. Risbeck, Ph.D., et al., from May with great interest, and we agree that ventilation is a costly source of achieving adequate equivalent outdoor air (EOA) supply. [...]the cost of operating ventilation systems for reducing infection risk is much lower than the cost of taking care of a large number of infected patients.1 Overloading the health-care system is a painful lesson learned in many places.