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Comparing Ammonia Evaporator Construction


July 25, 2012

COLVILLE, Wash. – Colmac Coil announces the release of a new technical bulletin titled "Comparing Ammonia Evaporator Construction: Which One Is Best?". This newly published bulletin describes the characteristics of each type of coil construction, galvanized steel, stainless steel tubes with aluminum fins, and aluminum tubes and fins (all aluminum).

Industrial ammonia evaporator manufacturers offer several types of construction including: galvanized steel, stainless steel tubes with aluminum fins, stainless steel tubes with stainless steel fins, and aluminum tubes with aluminum fins, as well as a number of corrosion resistant coatings.

Trying to decide on the right one for a given facility and/or process can be confusing and leads to the question: “Which one is best for my application?” The metals used in each type of construction mentioned above have unique properties which affect the evaporator in terms of thermal performance, weight, defrost energy, corrosion resistance, and cost. Good performance and energy efficiency have a direct positive effect on return on investment for the facility. The weight of the evaporators may affect the roof structure of the building in the case of ceiling or roof mounted units, especially in high seismic zones. In food processing plants where harsh cleaning chemicals are increasingly used on evaporators, appropriate corrosion resistance behavior is critical.

The article compares the different types of construction in terms of:

  • Strength
  • Cost/Price
  • Weight
  • Performance
  • Defrosting
  • Corrosion Resistance
  • Reliability


Loss of metal (corrosion) in evaporator coils can be caused by exposure to a corrosive environment, contact with foodstuffs, or cleaning with harsh chemicals. Each type of evaporator construction can react differently to the operating environment. This important topic is discussed and recommendations are made regarding proper selection of coil construction as well as cleaning and sanitizing chemicals.

For more information contact Jeremy Olberding, 509-684-2595,

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