In today’s world, where sustainability and energy efficiency are more important than ever, the search for greener and more cost-effective alternatives for industrial refrigeration systems is a priority. In this context, ammonia emerges as one of the most effective and environmentally friendly refrigerants. Its properties allow it to replace traditional synthetic refrigerants, such as CFCs and HFCs, which are known for their negative impact on the ozone layer and contribution to global warming. In this post, we highlight the properties, advantages, and challenges of ammonia as an efficient refrigerant in industrial and commercial refrigeration.
Why is ammonia considered an efficient refrigerant?
Certainly, ammonia, also known as R-717, has been used as a refrigerant since the early 20th century. This natural, colorless gas with a characteristic strong and pungent odor has proven to be particularly effective in the refrigeration industry due to its unique properties. Over the years, its popularity has grown due to its benefits in terms of energy efficiency and low environmental impact. Additionally, its ability to operate at extremely low temperatures makes it an ideal choice for industrial applications that require large-scale constant refrigeration.
One of the main reasons ammonia is so effective is its boiling point, which is -33.34°C. This characteristic, combined with its high critical temperature –132.5°C– allows ammonia to absorb and release heat much more efficiently than other refrigerants. By changing from liquid to gas and vice versa, ammonia can extract much more heat without requiring large amounts of additional energy. In this way, it enhances the overall performance of refrigeration systems.
The refrigeration cycle with ammonia
The operation of a refrigeration system based on ammonia as an efficient refrigerant follows a continuous process involving four key components: the compressor, condenser, expansion valve, and evaporator. During this cycle, ammonia absorbs heat from the space to be cooled and transfers it to the external environment:
- Compression. The cycle begins when ammonia, in the form of low-pressure gas, is compressed by the compressor. This process increases its temperature and turns it into a high-pressure gas.
- Condensation. Then, this hot gas passes into the condenser, where the absorbed heat is released into the external environment. Losing heat causes the gas to turn into a liquid.
- Expansion. The high-pressure liquid flows through an expansion valve, where its pressure drops drastically. This causes its conversion into a low-pressure gas at a much lower temperature.
- Evaporation. Finally, the cold gas enters the evaporator, where it absorbs heat from the space to be cooled, completing the cycle. This process repeats over and over, ensuring constant and efficient refrigeration.
Advantages of using ammonia as an efficient refrigerant
In particular, ammonia stands out for several advantages that make it the preferred option in industrial refrigeration, especially in sectors such as the food, chemical, and pharmaceutical industries:
High energy efficiency
Ammonia has a high latent heat of vaporization. This means it can absorb large amounts of heat during its transition from liquid to gas. Such a process allows it to maintain a highly efficient refrigeration cycle. Ammonia refrigeration systems require less energy to operate, which not only reduces energy consumption but also operational costs.
Certainly, this energy efficiency is especially valuable in large facilities, where energy costs can be a significant part of overall expenses.
Low environmental impact
Unlike synthetic refrigerants such as HFCs and HCFCs, which have a high global warming potential (GWP), ammonia is a natural gas that does not contribute to the greenhouse effect. In fact, ammonia is one of the low-impact GWP refrigerants, meaning it does not harm the ozone layer. This makes it a much more environmentally friendly option. Now, with greater concern for sustainability, ammonia as an efficient refrigerant is an ideal choice for reducing the carbon footprint in businesses and complying with stricter environmental regulations.
Lower operating costs
Indeed, ammonia is a cost-effective option due to its high efficiency and low cost compared to other refrigerants. Although the initial cost for installing an ammonia-based refrigeration system may be higher, the long-term savings in energy consumption and maintenance make it an attractive investment. Additionally, ammonia is readily available and does not require the use of additional chemicals. For this reason, its maintenance tends to be less expensive than that of systems using synthetic refrigerants.
Intersam: Leaders in designing evaporators with ammonia as an efficient refrigerant
If you are looking for an ammonia evaporator tailored to your specific needs, at Intersam we can help. With 30 years of experience in designing and manufacturing industrial and commercial refrigeration and air conditioning systems, Intersam offers customized solutions that meet the most demanding regulations.
Our evaporators for refrigeration systems using ammonia as an efficient refrigerant are designed to offer high durability and exceptional performance. We use top-quality materials, such as AISI-316 stainless steel and TIG welding, to ensure the strength and reliability of our equipment.
If you would like more information about our industrial evaporators and how they can improve your refrigeration system with ammonia as an efficient refrigerant, visit our online catalog and discover our innovative and customized solutions.