Frankfurt, Germany-based Eurammon wants ammonia to stay on the list - and at a pretty high position.
"For today and the future, the [use of ammonia] is indispensable for providing mankind with necessities," the organization said in a document familiar to the industry but still timely.
"Since the invention of the refrigerating machine in the past century, large refrigerating systems in the food, beverage, and chemical industries have predominately been built for ammonia," the report said. "And even today this is still the case.
"It is a fact that ammonia, in comparison to other substances, can serve its purpose with by far the least consumption of energy. Nearly all over Europe excellent experiences have been gained with ammonia: breweries, slaughterhouses, and large freezing plants.
"Therefore, it is surprising that competing substances could ever challenge its position as a refrigerant."
The association then ticked off possible reasons ammonia could garner less than favorable reviews, such as safety issues because of its toxic nature, the lack of strong lobbying efforts, limitations for its use as systems get smaller, and different skills needed to work with the piping for ammonia systems rather than the more common copper piping.
First, it is argued that ammonia is a natural refrigerant that has neither ozone depletion nor global warming potential.
The safety issue is really of "only a minor risk potential." Here, the report notes, "Each human being transpires 17 grams of the substance a day. Only 3 percent of the ammonia existing on this planet results from human activity even though it is produced in large quantities for fertilizers. Ammonia is readily soluble in water."
The fact that ammonia emits an odor can be an advantage, the report argues. "Even the slightest traces of ammonia in the air can be perceived easily. Refrigerant leakage is therefore detected at once.
"Actually, even among persons who are used to relatively high concentrations of ammonia due to their work, not a single case of lasting disease has been reported over an observation period of several generations."
An additional "handle with care" directive: "Increased attention is required to prevent liquid ammonia from getting into sewage or ground water."
"In a compound with air, ammonia is ignitable only within a very narrow span of concentrations - and this only in combination with high ignition energy.
"Therefore, fears of explosions are unfounded. In this respect, ammonia differs substantially from the other refrigerants under discussion such as propane and butane."
"As for any technical system, unforeseeable emissions cannot be completely ruled out," the re-port said. "Except for a temporary irritation by bad smell, no further consequences need to be feared. Gaseous ammonia is considerably lighter than air. Therefore, it ascends very quickly to higher atmospheric layers, similar to visual smoke. There it decomposes within a few days. The released nitrogen is washed out by the rain and spread out as a fertilizer in the ground."
The report said, "Without a doubt, by using ammonia, refrigeration can be realized with the least possible energy requirement. In this respect, the endeavors to reduce the global greenhouse effect can also be best supported with this refrigerant."
The report went on to say that new technologies are further showing ammonia in a favorable way.
"In comparison to existing old systems, modern ammonia systems are designed for clearly reduced refrigerant charges. They correspond to ideas which do justice to today's environmental awareness."
For more information, visit www.eurammon.com.
Publication date: 11/01/2004