Tough New Nonroad Diesel Engine Emissions Standards Call for Innovation

CuproBraze Process a Solution Front Runner

NEW YORK, June 23 -- A new proposal from the U.S. Environmental Protection Agency (EPA) will require nonroad diesel engines to reduce particulate matter (PM) emissions and oxides of nitrogen (NOx) emissions by an additional 80 to 90 percent. Thanks to engine advancements made to meet previous standards, today's nonroad engines already produce 70 percent less NOx emissions and 90 percent less PM emissions compared to engines built prior to 1987. However, little known to the public is that nonroad diesel engines currently account for about 44 percent of PM emissions and about 12 percent of NOx emissions from mobile sources nationwide with an even greater percentage in some urban areas.

Not surprisingly, environmentalists have gained support for tough new emissions standards for nonroad diesel engines, similar to those already set for over-the-highway diesel engines. Although the targets are clearly set, it is not clear which technologies are best suited to meet the standards. The technologies under evaluation typically require engine systems that operate at higher temperatures compared to past designs. However, aluminum radiators and charge air coolers are especially temperature challenged above 200 degrees C.

As an alternative, CuproBraze heat exchangers are well suited for operation at higher temperatures. Since a low velocity places a premium on the airflow through the heat exchangers, there is a need to provide even better cooling performance for an off-highway engine than for a heavy-duty (HD) on-highway engine. Conventional, soldered copper-brass heat exchangers already are preferred over aluminum for nonroad applications, because they can withstand harsh environments and operating conditions better than their aluminum counterparts. Farm and construction equipment especially must tolerate large amounts of dirt and debris, vibrations and regular cleaning. In these applications, durability is stressed over weight.

Already, the CuproBraze process has proven itself in the high volume production of HD radiators and copper-brass charge air coolers. The flexible manufacturing process is ideal for nonroad diesel engine makers. Prototypes can be fabricated for testing and evaluation, and high volume production can be ramped up in time for the scheduled implementation of the new emissions standards.

Further information regarding the CuproBraze process can be obtained from the International Copper Association (ICA) by calling Anthony Lea, (212) 251-7240.

The International Copper Association, Ltd. is the leading organization for the promotion of the use of copper worldwide. The Association's twenty-nine members represent about 80 percent of the world's refined copper output, and its six associate members are among the world's largest copper and copper-alloy fabricators. ICA is responsible for guiding policy, strategy and funding of international initiatives and promotional activities. With headquarters in New York City, ICA operates in 28 worldwide locations through a network of regional offices and copper development associations.