An ammonia absorption chiller uses aqueous ammonia solution as the refrigerant with water as the absorbent to produce cooling without mechanical compression. These systems deliver high cooling capacity densities and operate at lower temperatures than lithium bromide alternatives, typically reaching 15-30°F chilled water outputs. Ammonia chillers are common in large industrial cooling applications where extreme temperature requirements exist.
Technical Details
Ammonia absorption chillers utilize higher operating pressures ranging from 150-250 psia, enabling more compact equipment design and greater cooling intensity. The thermodynamic cycle achieves coefficient of performance (COP) values of 0.6-0.8 at standard operating conditions. Heat input requirements range from 12,000-14,000 BTU per ton of cooling. These systems require robust safety protocols due to ammonia’s toxic classification under EPA regulations and OSHA standards.
Applications and Practical Significance
Industrial facilities with process cooling demands, ice rinks, and cold storage warehouses depend on ammonia chillers for reliable deep cooling performance. The systems provide superior heat recovery capabilities when paired with dual-bundle condensers. Although ammonia chillers demand specialized maintenance training and compliance documentation, their exceptional efficiency and high cooling densities justify implementation in large-scale industrial operations where equipment footprint restrictions exist.