Carbon dioxide, which is making progress as a refrigerant in the North American supermarket sector, is also increasingly infiltrating its way into the industrial sector in cascade and secondary systems, which was evident at the IIAR (International Institute of Ammonia Refrigeration) 2015 Conference & Exhibition, which took place in San Diego from 22-25 March.
In Canadian warehouses, we need heat reclaim applications for heating the shipping docks and higher-temperature rooms,” said Dolbec. The NH3-CO2 systems also enable end users to reduce their ammonia charge.
In the future we expect to do ammonia-CO2 in industrial plants,” O’Brien said, adding that this would decrease the ammonia charge compared to ammonia-only systems. “We had to put our toe in the water before jumping in.”
CO2 is on our radar,” said Tom Melotik, district sales manager for Vilter. “There’s not a lot of CO2 [refrigeration] in the U.S., but it’s starting to grow, even at a conference like this.”
CO2 is starting to perk up in industrial and recreational (ice rinks) in the U.S.,” said Jose Mergulhao, vice president, US operations for Cimco. “NewTon is one of the pieces – a small dedicated package built for smaller facilities, maybe 5,000 to 10,000 square feet (465 – 929 m2) with three evaporators.
These guys handle ammonia, but that doesn’t run at the high temperatures of CO2,” he said. “So we need to educate them on CO2 and gauge what they find difficult about it and what they need. Do we need to change our products to meet their needs? Ultimately, CO2 [adoption] hinges on contractors being able to service them.”
For example, he sees interest in ammonia-CO2 systems for new facilities that reduce the ammonia charge compared to traditional systems. Guys want to keep ammonia in the engine room and CO2 in the plant,” he said at his IIAR booth. But the change from large-charge ammonia systems will not happen overnight. “It will take 30-40 years to get to that in all new plants.”
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