ANALYSIS AND SELECTION OF ENVIRONMENTALLY FRIENDLY REFRIGERANTS FOR AIR HEAT PUMP HEATING SYSTEMS
The issue of the selection of environmentally sound refrigerants for heating systems has been given particular attention. The use of freons in recent years has been linked to various restrictions imposed by international agreements, such as the Montreal Protocol on Substances that Deplete the Ozone Layer and the Kyoto Protocol on Substances Affecting Global Warming. The article presents the classification of environmental safety of freons, based on indicators of exceptional importance for the environment and safe operation of heat-cooling plants: indicators of toxicity, fire-explosion hazard, ozone safety, global warming potential and safety for humans. The results of the classification of environmental safety and safety of freons presented in the article can be used in the development of new refrigerants and their registration in accordance with the official international classification of refrigerants for assignment to the latter number. Using the composite infographic model of environmental safety of refrigerants used in heat pump for heating systems, a number of freons were analyzed, which allowed to rank refrigerants by the value of integral indicator and to establish the most environmentally friendly of them.