Question

When working with non-toxic refrigerants such as R-134a, R-12, R-22, and R-500, what should be considered?

1) The pressure-temperature relationship
2) The specific heat capacity
3) The thermal conductivity
4) The viscosity

Answer 1

When working with non-toxic refrigerants like R-134a, R-12, R-22, and R-500, it is important to consider the pressure-temperature relationship, specific heat capacity, thermal conductivity, and viscosity to ensure effective and efficient refrigeration cycles.

Step-by-step explanation:

When working with non-toxic refrigerants such as R-134a, R-12, R-22, and R-500, several properties should be considered to ensure efficient operation of the refrigeration cycle. These properties are:

• Pressure-temperature relationship: Understanding the relationship between pressure and temperature is essential for determining the refrigerant's phase (solid, liquid, or gas) and its behavior during the refrigeration cycle.
• Specific heat capacity: This defines the amount of heat required to change the temperature of a unit mass of the refrigerant by one degree Celsius and impacts the efficiency of the heat transfer process.
• Thermal conductivity: A higher thermal conductivity allows the refrigerant to transfer heat more effectively, which is crucial for the heat exchange process within the refrigeration system.
• Viscosity: The viscosity of the refrigerant affects the flow resistance in the refrigeration system. A lower viscosity generally allows for easier flow and better heat transfer.

By considering these properties, you can better understand and optimize the performance of refrigeration systems using these non-toxic refrigerants.