Natural refrigerants are real substances from the environment which are used in refrigeration systems such as Ammonia (NH3), carbon dioxide (CO2), water (H2O), propane and butane. These substances when used as refrigerants have many good properties, such as:
Little effect on ozone depletion and the greenhouse effect
Low overhead through the use of natural resources thus lower prices
Transport and storage requirements and by leakage, not flammable, toxic, or corrosive
High heat absorption / 1Kg of a substance
No decomposition of the substances through pressure and temperature changes. Unfortunately the good qualities do not come together often, therefore there is no perfect refrigerant but each material has its strengths.
When planning new facilities we always take the environment into account. Not only the effectiveness of the plant but also ozone depletion and the greenhouse effect play an important role. Therefore natural refrigerants are a good alternative. For example:
- Propane as operating material in cold water systems. Although the gas is explosive, safe operation is guaranteed.
- Water as heat transfer medium reduces the amount of refrigerant needed in the circuit.
- • CO2 has the 5-8 fold volumetric cooling capacity compared to usual refrigerants, thus requiring less machine output. On the other hand, the operating pressure is up to 10 times higher.
- • Ammonia in refrigeration systems with high performance and large capacity peaks. Research for further natural refrigerant applications continues in order to protect the climate today and in the future.
Stand 06.06.2013 Lars Sudmann