Design for the Ford-class carrier began in March 1996, and finally, more than $15 billion later, the USS Gerald Ford was fully certified for combat in April 2023. Because of a misguided green initiative, instead of inherently super energy-efficient steam-based laundries, the Ford-class carriers have standardized on more expensive, more complex, inherently fire-prone, ozone-based systems.
The green reason for these systems is that they supposedly save energy and water by being able to operate with cold water only, while also needing 30 percent less water than the steam-based systems that the U.S. Navy has historically relied on. A Jan. 12, 2012, Navy memo made this revealing statement:
“Ozone technology is increasing the earth-friendly aspect of shipboard laundering and moving navy laundries towards a ‘greener’ process. Good for the sailor ... good for the ship ... good for the earth!”
This sure sounds wonderful, but just a bit of analysis shows that the ozone-based laundries, like so many of the U.S. military’s so-called green initiatives, actually weaken our military while costing more than the mechanically robust, battle-tested systems they replace.
First, it must be pointed out that when you look at the energy budget of a typical warship, including propulsion, less than 1 percent of the warship’s total energy budget is expended on freshwater production and laundry services, with the vast majority of energy being used for the ship’s propulsion and the rest of the systems described by the Expanded Ship Work Breakdown Structure for Navy ships.
What’s more, the annual cost for producing fresh water on our entire fleet of Navy ships is just $22 million, and the water for the laundry is a fraction of this. Further, every Navy ship can produce far more fresh water than it needs for its average daily use. For example, both Ford- and Nimitz-class carriers can produce double the average amount of water needed daily. Getting more specific, installing an ozone-based laundry on an Arleigh Burke destroyer, which uses gas turbines instead of steam turbines, does result in a 30 percent reduction in energy used by its laundry system, including the energy savings from reduced freshwater desalination. But with laundries consuming less than 1 percent of ships’ overall energy consumption (including propulsion), this would result in less than 0.3 percent energy savings. All other things equal, that might make sense, especially if the systems were built into the ship from the outset. But the ozone-based systems cost more, require more ongoing maintenance, are more dependent on expensive shore-based vendor support to keep them operational, and are built around a potent oxidizer—ozone.
Finally, the ozone-related laundries end up creating a much drier environment than the moist atmosphere created by steam-reliant systems. It was the drier environment that helped create the extremely dry lint that caused the Ford laundry room fire. And these high-tech laundries require very expensive, corrosion-resistant piping, fittings, and seals, along with 24/7 monitoring to ensure that the highly corrosive, lung-irritating, fire-accelerating ozone does not find its way past the specialized, very expensive seals. So, even for ships that rely on gas turbines or marine diesels, such as our Navy’s destroyers and some of our larger warships, the case for ozone-based systems is highly debatable, to say the least.
But when it comes to ships such as our carriers, submarines, and about 10 other large warships and support vessels whose prime movers are steam turbines, the ozone-based systems are a big, expensive step backward in pretty much every area, including the environment. This is the case because our ships’ high-pressure steam turbines naturally produce relatively low-pressure waste steam that can either be recondensed by using cold ocean water or be used to heat water for a ship’s laundry and provide heat for the ship’s clothes dryers. In other words, this is nearly free energy. In contrast, the ozone-based laundry is 100 percent reliant on electricity from the ship’s generators. Thus, steam-reliant laundries are much more energy efficient or “green” than ozone-reliant ones. And although the gray water discharge from ozone-based systems is technically superior to that from steam-reliant systems, the sun and natural mechanisms in the ocean rapidly remediate all gray water discharges. Hence, from a practical environmental perspective, the gray water discharges are identical.
