Which of the following are considered alternative refrigerants to F-Gases?

Alternative refrigerants to F-Gases are those substances that have a lower environmental impact, particularly concerning ozone depletion and global warming potential. Hydrocarbons, ammonia, and CO2 are recognized as viable alternatives because they often exhibit lower global warming potentials and do not contribute to the depletion of the ozone layer.

Hydrocarbons such as propane and isobutane serve as natural refrigerants with excellent thermodynamic properties, making them effective substitutes. Ammonia is another natural refrigerant that is highly efficient but requires careful handling due to its toxicity. Carbon dioxide (CO2) is a greenhouse gas, but it has a very low global warming potential compared to F-Gases, making it a suitable alternative in various applications.

In contrast, the other options would not be considered suitable alternatives. Chlorofluorocarbons are known for their significant ozone-depleting properties. Freon is a trade name typically associated with chlorofluorocarbons, which are now largely phased out due to their harmful environmental effects. Likewise, both propylene glycol and ethylene glycol are typically used as heat transfer fluids rather than refrigerants. Therefore, hydrocarbons, ammonia, and CO2 stand out as environmentally friendlier alternatives to conventional F-Gases.