Why is anhydrous ammonia refrigerant becoming more and more popular?

Anhydrous ammonia is a useful refrigerant due to its vaporizing properties. Why is anhydrous ammonia refrigerant becoming more and more popular?

Anhydrous ammonia is an inorganic compound with the chemical formula NH3. Anhydrous ammonia is common in nature, both on Earth and on the outer planets of the solar system. Whether found in nature or man-made, ammonia is colorless but has a pungent, pungent smell.

As there are fewer chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) available as refrigerants, companies are looking to anhydrous ammonia refrigerant as a more efficient alternative.

According to ASHRAE and the International Institute of Ammonia Refrigeration (IIAR), anhydrous ammonia is a cost-effective alternative to CFCs and HCFCs that is also safe for the environment.

Anhydrous ammonia, which is often used commercially in large freezing and cold storage plants, contains almost no water and is 99.98% pure. By comparison, household anhydrous ammonia contains only about 10% by weight of ammonia mixed with water.

Anhydrous ammonia refrigeration works very similarly to industrial refrigeration systems that use synthetic refrigerants. The liquid anhydrous ammonia used for refrigeration is usually stored in tanks under pressure. The release of anhydrous ammonia pressure results in rapid vaporization. The vaporization process causes cooling, as water evaporates from a surface, and the temperature drops to anhydrous ammonia's normal boiling point of about -33⁰C.

In fact, the thermodynamic properties of anhydrous ammonia make it superior to synthetic refrigerants in most applications.

Anhydrous ammonia refrigeration is most commonly used in facilities with large refrigeration systems, such as food and beverage manufacturing facilities, cold storage, combined cycle power plants, and petrochemical facilities, as detailed below.

Food processing plants: anhydrous ammonia refrigerant is employed in food processing plants for products like meat packaging, dairy products, fish, fruits and vegetables. It plays a vital role in providing cooling for refrigerated, frozen and refrigerated applications, helping to preserve and extend the shelf life of perishable foods.

Cold Warehouses: In addition to food, these warehouses are used to store pharmaceuticals, chemicals, and other temperature-sensitive products. Anhydrous ammonia refrigerant is essential to prevent these items from spoiling or degrading.

Brewery and Beverage Industry: Anhydrous ammonia is used to cool and maintain required temperatures during various processes in breweries, including beverage brewing, fermentation and storage.

Chemical Industry: In the chemical industry, anhydrous ammonia refrigerant is critical for a variety of processes, reactors and equipment used in the production, refining and storage of chemicals.

Petrochemical Industry: Anhydrous ammonia is an integral part of petrochemical industry operations, used in processes such as natural gas processing and cooling of equipment and storage tanks.

As a refrigerant, anhydrous ammonia has four major advantages over CFCs and HCFCs:

Because narrower diameter pipes can be used, anhydrous ammonia-based refrigeration systems cost 10-20% less to build than systems using CFCs.

Anhydrous ammonia is a refrigerant that is 3-10% more efficient than CFC, when anhydrous ammonia refrigeration systems at full load, they are 20% more efficient than other systems at full load. so anhydrous ammonia systems require less electricity, reducing operating costs.

Anhydrous ammonia is environmentally safe with an ozone depletion potential (ODP) of 0 and a global warming potential (GWP) of 0.

Anhydrous ammonia is much cheaper than CFCs or HCFCs, costing about one-tenth of the latter.

The main disadvantage of using anhydrous ammonia refrigerant is that it is incompatible with copper and therefore cannot be used in any system with copper pipes; high concentrations of anhydrous ammonia are toxic and special care is required when handling anhydrous ammonia. It can quickly evaporate into a gaseous state and can spread in the air. Due to anhydrous ammonia flammable properties, it can easily cause an explosion. In many countries, it is classified as an extremely hazardous substance, and facilities that produce, store, or use it in large quantities must adhere to strict reporting requirements.

In the event of an anhydrous ammonia leak or fire, emergency measures must be taken to prevent further damage while ensuring the safety of all personnel. The first step is to evacuate to ensure that people stay away from the danger area. While evacuating, the fire department needs to be called urgently to go to the scene to extinguish the fire and handle hazards. When dealing with anhydrous ammonia leaks, the possibility of combustion and poisoning should be considered, the source of the leak should be blocked, and ventilation should be enhanced.

All in all, the use of anhydrous ammonia refrigerant is becoming increasingly common in green buildings and may be a viable option for district cooling systems. As refrigerant legislation continues to tighten to encourage the use of alternative environmentally friendly refrigerants, anhydrous ammonia has zero global warming potential and zero ozone depletion potential, making it a more attractive alternative.