Trailer Talk

Liquid Nitrogen – How Cool is That?

Guest post: Toss the diesel and pump in some liquid nitrogen for super-cold cooling.

August 8, 2014

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Senior Editor Tom Berg is taking some vacation time, so Executive Contributing Editor Rolf Lockwood offers some thoughts on a really cool – make that super cold -- liquid nitrogen-powered reefer unit.

The Cryometrix CB-40 pollution-free reefer.
The Cryometrix CB-40 pollution-free reefer.

I've always thought that trailer refrigeration units, like APUs, offered great potential for the use of interesting technologies, especially on the fuel front. Maybe fuel cells? If I knew more about refrigerants, I might have seen development ideas there too.

Well, somebody else has: Reflect Scientific, based in Orem, Utah, is a 30-year-old outfit that’s been developing and marketing proprietary technologies in cryogenic cooling for the biotechnology, pharmaceutical, and medical industries. And now, through its Cryometrix division, for the transportation market. 

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Reflect says a Cryometrix CB-40 transport refrigeration unit made history by delivering its first commercial load of frozen foods using a new pollution-free refrigeration technology. A 53-foot reefer trailer loaded with frozen ravioli, lasagna, and corn dogs – plus ice cream and popsicles – was hauled out of Salt Lake City at 10:30 one night last April.

Some 525 miles and 24 hours later the trailer reached its destination and the last of its load was delivered in Denver, Colo., still maintaining the temperature at -15 F (-26 C). That's a challenge when the ambient temperature is changing through the seven drops made during that trip. 

The thing is, no diesel fuel was used to keep that cargo cold, and Reflect Scientific thinks this is the future of transport refrigeration. 

The maker says its Cryometrix CB-40 TRU is a pollution-free refrigeration alternative to diesel-powered systems. It uses a patented liquid-nitrogen cooling system to achieve consistent temperature control with almost no moving parts and what's claimed to be greater reliability. A closed, self-contained refrigeration system ensures nothing but fresh cold air enters the trailer or touches the food.

Late last December the company did a 1,323-mile road test of the CB-40, the first time it had been used to haul perishable goods in a commercial setting. It was a challenging test to maintain refrigeration on a round trip from Salt Lake City to Los Angeles, but the company says the unit "performed beyond our expectations...  with no loss and no major problems." 

The CB-40 is a direct replacement for current diesel systems and is easily retrofitted into an existing trailer. Not only is there no diesel engine, but there's no compressor, either. It has few moving parts, which contributes to what is said to be a "dramatically reduced" maintenance requirement. System weight is comparable to diesel systems, I'm told.

Benefits also include "excellent" temperature uniformity within the trailer, and no noise, which would make drivers trying to sleep beside or in front of a CB-40 mighty happy. 

Liquid nitrogen, by the way, is a low-cost byproduct from the gas liquefaction industry. Reflect says it costs less than diesel fuel per unit of cooling, and of course running costs for a CB-40 would never include an engine rebuild or replacement. Reflect Scientific says you'd see a lower overall cost of operation.

The CB-40 is the first zero-emissions TRU and it meets all current and future state and federal pollution standards, its maker says. 

And who knows, maybe it really is the future of transport refrigeration.

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Author Bio

Tom Berg

Senior Editor

Journalist since 1965, truck writer and editor since 1978. CDL-qualified; conducts road tests on new heavy-, medium- and light-duty tractors and trucks. Specializes in vocational and hybrid vehicles.

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