ABSTRACT
The recent COVID-19 pandemic has led to a nearly world-wide shelter-in-place strategy. This raises several natural concerns about the safe relaxing of current restrictions. This article focuses on the design and operation of heating ventilation and air conditioning (HVAC) systems in the context of transportation. Do HVAC systems have a role in limiting viral spread? During shelter-in-place, can the HVAC system in a dwelling or a vehicle help limit spread of the virus? After the shelter-in-place strategy ends, can typical workplace and transportation HVAC systems limit spread of the virus? This article directly addresses these and other questions. In addition, it also summarizes simplifying assumptions needed to make meaningful predictions. This article derives new results using transform methods first given in Ginsberg and Bui. These new results describe viral spread through an HVAC system and estimate the aggregate dose of virus inhaled by an uninfected building or vehicle occupant when an infected occupant is present within the same building or vehicle. Central to these results is the derivation of a quantity called the "protection factor"-a term-of-art borrowed from the design of gas masks. Older results that rely on numerical approximations to these differential equations have long been lab validated. This article gives the exact solutions in fixed infrastructure for the first time. These solutions, therefore, retain the same lab validation of the older methods of approximation. Further, these exact solutions yield valuable insights into HVAC systems used in transportation.
ABSTRACT
Air mobility has been a military strategic advantage used by the United States (U.S.) from the onset of aircraft carriers, to supporting air bases worldwide. The U.S. government and defense components rely heavily on a civilian fleet of aircraft to supplement air transportation requirements in both peace times and during national emergencies. This paper reviews the historical and legal development of the Civil Reserve Air Fleet (CRAF) and discusses previous struggles and successes of the program by looking at the functionality of the program, before addressing how current events bring about the realization that the program must change. Current changes in the way U.S. airlines operate, the way warfare has been changed, and the financial hardships associated with the COVID-19 pandemic are all used to envision a future of the CRAF program to provide future air transportation capabilities to allow the U.S. government to maintain the necessary strategic advantage of responsive airlift capabilities.