In an NH3 system, how is the condenser metal selected based on water type used?

The selection of condenser metal in an NH3 (ammonia) system is influenced by the type of water used, which can affect corrosion and overall durability. The correct answer emphasizes the importance of using galvanized steel for its durability, particularly in environments where ammonia is present. Galvanized steel provides a protective layer of zinc, which helps prevent rust and corrosion significantly more than untreated metals. This is essential in maintaining the integrity and longevity of the condenser system, especially in systems where moisture from the water could lead to corrosion over time.

While other metals like copper or aluminum may have specific advantages in different contexts, they may not provide the best performance in an NH3 environment where durability against corrosion is critical. Additionally, local codes can mandate specific materials based on safety and performance standards, but durability remains a primary consideration when selecting materials for condenser components in NH3 systems.